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heimdal/lib/krb5/init_creds_pw.c
Nicolas Williams 944e12e103 krb5: Add GIC optimistic FAST w/ anon
2021-12-30 18:54:54 +11:00

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/*
* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2009 - 2010 Apple Inc. All rights reserved.
* Portions Copyright (c) 2021, PADL Software Pty Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
#include "../base/heimbasepriv.h" /* XXX */
struct pa_info_data {
krb5_enctype etype;
krb5_salt salt;
krb5_data *s2kparams;
};
struct krb5_gss_init_ctx_data {
krb5_gssic_step step;
krb5_gssic_finish finish;
krb5_gssic_release_cred release_cred;
krb5_gssic_delete_sec_context delete_sec_context;
const struct gss_OID_desc_struct *mech;
struct gss_cred_id_t_desc_struct *cred;
struct {
unsigned int release_cred : 1;
} flags;
};
struct krb5_get_init_creds_ctx {
KDCOptions flags;
krb5_creds cred;
krb5_addresses *addrs;
krb5_enctype *etypes;
krb5_preauthtype *pre_auth_types;
char *in_tkt_service;
unsigned nonce;
unsigned pk_nonce;
krb5_data req_buffer;
AS_REQ as_req;
int pa_counter;
/* password and keytab_data is freed on completion */
char *password;
krb5_keytab_key_proc_args *keytab_data;
krb5_pointer *keyseed;
krb5_s2k_proc keyproc;
krb5_get_init_creds_tristate req_pac;
krb5_pk_init_ctx pk_init_ctx;
krb5_gss_init_ctx gss_init_ctx;
int ic_flags;
char *kdc_hostname;
char *sitename;
struct {
unsigned int change_password:1;
unsigned int change_password_prompt:1;
unsigned int allow_enc_pa_rep:1;
unsigned int allow_save_as_reply_key:1;
} runflags;
struct pa_info_data paid;
METHOD_DATA md;
KRB_ERROR error;
EncKDCRepPart enc_part;
krb5_prompter_fct prompter;
void *prompter_data;
int warned_user;
struct pa_info_data *ppaid;
struct krb5_fast_state fast_state;
krb5_enctype as_enctype;
krb5_keyblock *as_reply_key;
/* current and available pa mechansm in this exchange */
struct pa_auth_mech *pa_mech;
heim_array_t available_pa_mechs;
const char *pa_used;
struct {
struct timeval run_time;
} stats;
};
static void
free_paid(krb5_context context, struct pa_info_data *ppaid)
{
krb5_free_salt(context, ppaid->salt);
if (ppaid->s2kparams)
krb5_free_data(context, ppaid->s2kparams);
memset(ppaid, 0, sizeof(*ppaid));
}
static krb5_error_code KRB5_CALLCONV
default_s2k_func(krb5_context context, krb5_enctype type,
krb5_const_pointer keyseed,
krb5_salt salt, krb5_data *s2kparms,
krb5_keyblock **key)
{
krb5_error_code ret;
krb5_data password;
krb5_data opaque;
if (_krb5_have_debug(context, 5)) {
char *str = NULL;
ret = krb5_enctype_to_string(context, type, &str);
if (ret)
return ret;
_krb5_debug(context, 5, "krb5_get_init_creds: using default_s2k_func: %s (%d)", str, (int)type);
free(str);
}
password.data = rk_UNCONST(keyseed);
password.length = keyseed ? strlen(keyseed) : 0;
if (s2kparms)
opaque = *s2kparms;
else
krb5_data_zero(&opaque);
*key = malloc(sizeof(**key));
if (*key == NULL)
return krb5_enomem(context);
ret = krb5_string_to_key_data_salt_opaque(context, type, password,
salt, opaque, *key);
if (ret) {
free(*key);
*key = NULL;
}
return ret;
}
static void
free_gss_init_ctx(krb5_context context, krb5_gss_init_ctx gssic)
{
if (gssic == NULL)
return;
if (gssic->flags.release_cred)
gssic->release_cred(context, gssic, gssic->cred);
free(gssic);
}
static void
free_init_creds_ctx(krb5_context context, krb5_init_creds_context ctx)
{
if (ctx->etypes)
free(ctx->etypes);
if (ctx->pre_auth_types)
free (ctx->pre_auth_types);
if (ctx->in_tkt_service)
free(ctx->in_tkt_service);
if (ctx->keytab_data)
free(ctx->keytab_data);
if (ctx->password) {
size_t len;
len = strlen(ctx->password);
memset_s(ctx->password, len, 0, len);
free(ctx->password);
}
free_gss_init_ctx(context, ctx->gss_init_ctx);
/*
* FAST state
*/
_krb5_fast_free(context, &ctx->fast_state);
if (ctx->as_reply_key)
krb5_free_keyblock(context, ctx->as_reply_key);
krb5_data_free(&ctx->req_buffer);
krb5_free_cred_contents(context, &ctx->cred);
free_METHOD_DATA(&ctx->md);
free_EncKDCRepPart(&ctx->enc_part);
free_KRB_ERROR(&ctx->error);
free_AS_REQ(&ctx->as_req);
heim_release(ctx->available_pa_mechs);
heim_release(ctx->pa_mech);
ctx->pa_mech = NULL;
free(ctx->kdc_hostname);
free(ctx->sitename);
free_paid(context, &ctx->paid);
memset_s(ctx, sizeof(*ctx), 0, sizeof(*ctx));
}
static krb5_deltat
get_config_time (krb5_context context,
const char *realm,
const char *name,
int def)
{
krb5_deltat ret;
ret = krb5_config_get_time (context, NULL,
"realms",
realm,
name,
NULL);
if (ret >= 0)
return ret;
ret = krb5_config_get_time (context, NULL,
"libdefaults",
name,
NULL);
if (ret >= 0)
return ret;
return def;
}
static krb5_error_code
init_cred (krb5_context context,
krb5_creds *cred,
krb5_principal client,
krb5_deltat start_time,
krb5_get_init_creds_opt *options)
{
krb5_error_code ret;
krb5_deltat tmp;
krb5_timestamp now;
krb5_timeofday (context, &now);
memset (cred, 0, sizeof(*cred));
if (client)
ret = krb5_copy_principal(context, client, &cred->client);
else
ret = krb5_get_default_principal(context, &cred->client);
if (ret)
goto out;
if (start_time)
cred->times.starttime = now + start_time;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_TKT_LIFE)
tmp = options->tkt_life;
else
tmp = KRB5_TKT_LIFETIME_DEFAULT;
cred->times.endtime = now + tmp;
if ((options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE)) {
if (options->renew_life > 0)
tmp = options->renew_life;
else
tmp = KRB5_TKT_RENEW_LIFETIME_DEFAULT;
cred->times.renew_till = now + tmp;
}
return 0;
out:
krb5_free_cred_contents (context, cred);
return ret;
}
/*
* Print a message (str) to the user about the expiration in `lr'
*/
static void
report_expiration (krb5_context context,
krb5_prompter_fct prompter,
krb5_data *data,
const char *str,
time_t now)
{
char *p = NULL;
if (asprintf(&p, "%s%s", str, ctime(&now)) < 0 || p == NULL)
return;
(*prompter)(context, data, NULL, p, 0, NULL);
free(p);
}
/*
* Check the context, and in the case there is a expiration warning,
* use the prompter to print the warning.
*
* @param context A Kerberos 5 context.
* @param options An GIC options structure
* @param ctx The krb5_init_creds_context check for expiration.
*/
krb5_error_code
krb5_process_last_request(krb5_context context,
krb5_get_init_creds_opt *options,
krb5_init_creds_context ctx)
{
LastReq *lr;
size_t i;
/*
* First check if there is a API consumer.
*/
lr = &ctx->enc_part.last_req;
if (options && options->opt_private && options->opt_private->lr.func) {
krb5_last_req_entry **lre;
lre = calloc(lr->len + 1, sizeof(*lre));
if (lre == NULL)
return krb5_enomem(context);
for (i = 0; i < lr->len; i++) {
lre[i] = calloc(1, sizeof(*lre[i]));
if (lre[i] == NULL)
break;
lre[i]->lr_type = lr->val[i].lr_type;
lre[i]->value = lr->val[i].lr_value;
}
(*options->opt_private->lr.func)(context, lre,
options->opt_private->lr.ctx);
for (i = 0; i < lr->len; i++)
free(lre[i]);
free(lre);
}
return krb5_init_creds_warn_user(context, ctx);
}
/**
* Warn the user using prompter in the krb5_init_creds_context about
* possible password and account expiration.
*
* @param context a Kerberos 5 context.
* @param ctx a krb5_init_creds_context context.
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_warn_user(krb5_context context,
krb5_init_creds_context ctx)
{
krb5_timestamp sec;
krb5_const_realm realm;
krb5_enctype weak_enctype = KRB5_ENCTYPE_NULL;
LastReq *lr;
unsigned i;
time_t t;
if (ctx->prompter == NULL)
return 0;
if (ctx->warned_user)
return 0;
ctx->warned_user = 1;
krb5_timeofday (context, &sec);
realm = krb5_principal_get_realm (context, ctx->cred.client);
lr = &ctx->enc_part.last_req;
t = sec + get_config_time (context,
realm,
"warn_pwexpire",
7 * 24 * 60 * 60);
for (i = 0; i < lr->len; ++i) {
if (lr->val[i].lr_value <= t) {
switch (lr->val[i].lr_type) {
case LR_PW_EXPTIME :
report_expiration(context, ctx->prompter,
ctx->prompter_data,
"Your password will expire at ",
lr->val[i].lr_value);
break;
case LR_ACCT_EXPTIME :
report_expiration(context, ctx->prompter,
ctx->prompter_data,
"Your account will expire at ",
lr->val[i].lr_value);
break;
default:
break;
}
}
}
if (krb5_is_enctype_weak(context, ctx->as_enctype))
weak_enctype = ctx->as_enctype;
else if (krb5_is_enctype_weak(context, ctx->cred.session.keytype))
weak_enctype = ctx->cred.session.keytype;
if (ctx->prompter && weak_enctype != KRB5_ENCTYPE_NULL) {
int suppress = krb5_config_get_bool_default(context, NULL, false,
"libdefaults",
"suppress_weak_enctype", NULL);
if (!suppress) {
char *str = NULL, *p = NULL;
int aret;
krb5_enctype_to_string(context, weak_enctype, &str);
aret = asprintf(&p, "Encryption type %s(%d) used for authentication is weak and will be deprecated",
str ? str : "unknown", weak_enctype);
if (aret >= 0 && p) {
(*ctx->prompter)(context, ctx->prompter_data, NULL, p, 0, NULL);
free(p);
}
free(str);
}
}
return 0;
}
static krb5_addresses no_addrs = { 0, NULL };
static krb5_error_code
get_init_creds_common(krb5_context context,
krb5_principal client,
krb5_prompter_fct prompter,
void *prompter_data,
krb5_deltat start_time,
krb5_get_init_creds_opt *options,
krb5_init_creds_context ctx)
{
krb5_get_init_creds_opt *default_opt = NULL;
krb5_error_code ret;
krb5_enctype *etypes;
krb5_preauthtype *pre_auth_types;
memset(ctx, 0, sizeof(*ctx));
if (options == NULL) {
const char *realm = krb5_principal_get_realm(context, client);
krb5_get_init_creds_opt_alloc (context, &default_opt);
options = default_opt;
krb5_get_init_creds_opt_set_default_flags(context, NULL, realm, options);
}
if (options->opt_private) {
if (options->opt_private->password) {
ret = krb5_init_creds_set_password(context, ctx,
options->opt_private->password);
if (ret)
goto out;
}
ctx->keyproc = options->opt_private->key_proc;
ctx->req_pac = options->opt_private->req_pac;
ctx->pk_init_ctx = options->opt_private->pk_init_ctx;
ctx->ic_flags = options->opt_private->flags;
} else
ctx->req_pac = KRB5_INIT_CREDS_TRISTATE_UNSET;
if (ctx->keyproc == NULL)
ctx->keyproc = default_s2k_func;
if (ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE)
ctx->flags.canonicalize = 1;
ctx->pre_auth_types = NULL;
ctx->addrs = NULL;
ctx->etypes = NULL;
ctx->pre_auth_types = NULL;
ret = init_cred(context, &ctx->cred, client, start_time, options);
if (ret) {
if (default_opt)
krb5_get_init_creds_opt_free(context, default_opt);
return ret;
}
ret = krb5_init_creds_set_service(context, ctx, NULL);
if (ret)
goto out;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)
ctx->flags.forwardable = options->forwardable;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)
ctx->flags.proxiable = options->proxiable;
if (start_time)
ctx->flags.postdated = 1;
if (ctx->cred.times.renew_till)
ctx->flags.renewable = 1;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST) {
ctx->addrs = options->address_list;
} else if (options->opt_private) {
switch (options->opt_private->addressless) {
case KRB5_INIT_CREDS_TRISTATE_UNSET:
#if KRB5_ADDRESSLESS_DEFAULT == TRUE
ctx->addrs = &no_addrs;
#else
ctx->addrs = NULL;
#endif
break;
case KRB5_INIT_CREDS_TRISTATE_FALSE:
ctx->addrs = NULL;
break;
case KRB5_INIT_CREDS_TRISTATE_TRUE:
ctx->addrs = &no_addrs;
break;
}
}
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST) {
if (ctx->etypes)
free(ctx->etypes);
etypes = malloc((options->etype_list_length + 1)
* sizeof(krb5_enctype));
if (etypes == NULL) {
ret = krb5_enomem(context);
goto out;
}
memcpy (etypes, options->etype_list,
options->etype_list_length * sizeof(krb5_enctype));
etypes[options->etype_list_length] = ETYPE_NULL;
ctx->etypes = etypes;
}
if (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST) {
pre_auth_types = malloc((options->preauth_list_length + 1)
* sizeof(krb5_preauthtype));
if (pre_auth_types == NULL) {
ret = krb5_enomem(context);
goto out;
}
memcpy (pre_auth_types, options->preauth_list,
options->preauth_list_length * sizeof(krb5_preauthtype));
pre_auth_types[options->preauth_list_length] = KRB5_PADATA_NONE;
ctx->pre_auth_types = pre_auth_types;
}
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS)
ctx->flags.request_anonymous = options->anonymous;
ctx->prompter = prompter;
ctx->prompter_data = prompter_data;
if ((options->flags & KRB5_GET_INIT_CREDS_OPT_CHANGE_PASSWORD_PROMPT) &&
!options->change_password_prompt)
ctx->runflags.change_password_prompt = 0;
else
ctx->runflags.change_password_prompt = ctx->prompter != NULL;
if (default_opt)
krb5_get_init_creds_opt_free(context, default_opt);
return 0;
out:
if (default_opt)
krb5_get_init_creds_opt_free(context, default_opt);
return ret;
}
static krb5_error_code
change_password (krb5_context context,
krb5_principal client,
const char *password,
char *newpw,
size_t newpw_sz,
krb5_prompter_fct prompter,
void *data,
krb5_get_init_creds_opt *old_options)
{
krb5_prompt prompts[2];
krb5_error_code ret;
krb5_creds cpw_cred;
char buf1[BUFSIZ], buf2[BUFSIZ];
krb5_data password_data[2];
int result_code;
krb5_data result_code_string;
krb5_data result_string;
char *p;
krb5_get_init_creds_opt *options;
heim_assert(prompter != NULL, "unexpected NULL prompter");
memset (&cpw_cred, 0, sizeof(cpw_cred));
ret = krb5_get_init_creds_opt_alloc(context, &options);
if (ret)
return ret;
krb5_get_init_creds_opt_set_tkt_life (options, 60);
krb5_get_init_creds_opt_set_forwardable (options, FALSE);
krb5_get_init_creds_opt_set_proxiable (options, FALSE);
if (old_options &&
(old_options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST))
krb5_get_init_creds_opt_set_preauth_list(options,
old_options->preauth_list,
old_options->preauth_list_length);
if (old_options &&
(old_options->flags & KRB5_GET_INIT_CREDS_OPT_CHANGE_PASSWORD_PROMPT))
krb5_get_init_creds_opt_set_change_password_prompt(options,
old_options->change_password_prompt);
krb5_data_zero (&result_code_string);
krb5_data_zero (&result_string);
ret = krb5_get_init_creds_password (context,
&cpw_cred,
client,
password,
prompter,
data,
0,
"kadmin/changepw",
options);
krb5_get_init_creds_opt_free(context, options);
if (ret)
goto out;
for(;;) {
password_data[0].data = buf1;
password_data[0].length = sizeof(buf1);
prompts[0].hidden = 1;
prompts[0].prompt = "New password: ";
prompts[0].reply = &password_data[0];
prompts[0].type = KRB5_PROMPT_TYPE_NEW_PASSWORD;
password_data[1].data = buf2;
password_data[1].length = sizeof(buf2);
prompts[1].hidden = 1;
prompts[1].prompt = "Repeat new password: ";
prompts[1].reply = &password_data[1];
prompts[1].type = KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN;
ret = (*prompter) (context, data, NULL, "Changing password",
2, prompts);
if (ret) {
memset (buf1, 0, sizeof(buf1));
memset (buf2, 0, sizeof(buf2));
goto out;
}
if (strcmp (buf1, buf2) == 0)
break;
memset (buf1, 0, sizeof(buf1));
memset (buf2, 0, sizeof(buf2));
}
ret = krb5_set_password (context,
&cpw_cred,
buf1,
client,
&result_code,
&result_code_string,
&result_string);
if (ret)
goto out;
if (asprintf(&p, "%s: %.*s\n",
result_code ? "Error" : "Success",
(int)result_string.length,
result_string.length > 0 ? (char*)result_string.data : "") < 0)
{
ret = krb5_enomem(context);
goto out;
}
/* return the result */
(*prompter) (context, data, NULL, p, 0, NULL);
if (result_code == 0) {
strlcpy (newpw, buf1, newpw_sz);
ret = 0;
} else {
krb5_set_error_message(context, ret = KRB5_CHPW_FAIL,
N_("failed changing password: %s", ""), p);
}
free (p);
out:
memset_s(buf1, sizeof(buf1), 0, sizeof(buf1));
memset_s(buf2, sizeof(buf2), 0, sizeof(buf2));
krb5_data_free (&result_string);
krb5_data_free (&result_code_string);
krb5_free_cred_contents (context, &cpw_cred);
return ret;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_keyblock_key_proc (krb5_context context,
krb5_keytype type,
krb5_data *salt,
krb5_const_pointer keyseed,
krb5_keyblock **key)
{
return krb5_copy_keyblock (context, keyseed, key);
}
/*
*
*/
static krb5_error_code
init_as_req (krb5_context context,
KDCOptions opts,
const krb5_creds *creds,
const krb5_addresses *addrs,
const krb5_enctype *etypes,
AS_REQ *a)
{
krb5_error_code ret;
memset(a, 0, sizeof(*a));
a->pvno = 5;
a->msg_type = krb_as_req;
a->req_body.kdc_options = opts;
a->req_body.cname = calloc(1, sizeof(*a->req_body.cname));
if (a->req_body.cname == NULL) {
ret = krb5_enomem(context);
goto fail;
}
a->req_body.sname = calloc(1, sizeof(*a->req_body.sname));
if (a->req_body.sname == NULL) {
ret = krb5_enomem(context);
goto fail;
}
ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
if (ret)
goto fail;
ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
if (ret)
goto fail;
ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
if (ret)
goto fail;
if(creds->times.starttime) {
a->req_body.from = malloc(sizeof(*a->req_body.from));
if (a->req_body.from == NULL) {
ret = krb5_enomem(context);
goto fail;
}
*a->req_body.from = creds->times.starttime;
}
if(creds->times.endtime){
if ((ALLOC(a->req_body.till, 1)) != NULL)
*a->req_body.till = creds->times.endtime;
else {
ret = krb5_enomem(context);
goto fail;
}
}
if(creds->times.renew_till){
a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
if (a->req_body.rtime == NULL) {
ret = krb5_enomem(context);
goto fail;
}
*a->req_body.rtime = creds->times.renew_till;
}
a->req_body.nonce = 0;
ret = _krb5_init_etype(context,
KRB5_PDU_AS_REQUEST,
&a->req_body.etype.len,
&a->req_body.etype.val,
etypes);
if (ret)
goto fail;
/*
* This means no addresses
*/
if (addrs && addrs->len == 0) {
a->req_body.addresses = NULL;
} else {
a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
if (a->req_body.addresses == NULL) {
ret = krb5_enomem(context);
goto fail;
}
if (addrs)
ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
else {
ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
if(ret == 0 && a->req_body.addresses->len == 0) {
free(a->req_body.addresses);
a->req_body.addresses = NULL;
}
}
if (ret)
goto fail;
}
a->req_body.enc_authorization_data = NULL;
a->req_body.additional_tickets = NULL;
a->padata = NULL;
return 0;
fail:
free_AS_REQ(a);
memset_s(a, sizeof(*a), 0, sizeof(*a));
return ret;
}
static krb5_error_code
set_paid(struct pa_info_data *paid, krb5_context context,
krb5_enctype etype,
krb5_salttype salttype, void *salt_string, size_t salt_len,
krb5_data *s2kparams)
{
paid->etype = etype;
paid->salt.salttype = salttype;
paid->salt.saltvalue.data = malloc(salt_len + 1);
if (paid->salt.saltvalue.data == NULL) {
krb5_clear_error_message(context);
return krb5_enomem(context);
}
memcpy(paid->salt.saltvalue.data, salt_string, salt_len);
((char *)paid->salt.saltvalue.data)[salt_len] = '\0';
paid->salt.saltvalue.length = salt_len;
if (s2kparams) {
krb5_error_code ret;
ret = krb5_copy_data(context, s2kparams, &paid->s2kparams);
if (ret) {
krb5_clear_error_message(context);
krb5_free_salt(context, paid->salt);
return ret;
}
} else
paid->s2kparams = NULL;
return 0;
}
static struct pa_info_data *
pa_etype_info2(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
heim_octet_string *data)
{
krb5_error_code ret;
ETYPE_INFO2 e;
size_t sz;
size_t i, j;
memset(&e, 0, sizeof(e));
ret = decode_ETYPE_INFO2(data->data, data->length, &e, &sz);
if (ret)
goto out;
if (e.len == 0)
goto out;
for (j = 0; j < asreq->req_body.etype.len; j++) {
for (i = 0; i < e.len; i++) {
if (krb5_enctype_valid(context, e.val[i].etype) != 0)
continue;
if (asreq->req_body.etype.val[j] == e.val[i].etype) {
krb5_salt salt;
if (e.val[i].salt == NULL)
ret = krb5_get_pw_salt(context, client, &salt);
else {
salt.saltvalue.data = *e.val[i].salt;
salt.saltvalue.length = strlen(*e.val[i].salt);
ret = 0;
}
if (ret == 0)
ret = set_paid(paid, context, e.val[i].etype,
KRB5_PW_SALT,
salt.saltvalue.data,
salt.saltvalue.length,
e.val[i].s2kparams);
if (e.val[i].salt == NULL)
krb5_free_salt(context, salt);
if (ret == 0) {
free_ETYPE_INFO2(&e);
return paid;
}
}
}
}
out:
free_ETYPE_INFO2(&e);
return NULL;
}
static struct pa_info_data *
pa_etype_info(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
heim_octet_string *data)
{
krb5_error_code ret;
ETYPE_INFO e;
size_t sz;
size_t i, j;
memset(&e, 0, sizeof(e));
ret = decode_ETYPE_INFO(data->data, data->length, &e, &sz);
if (ret)
goto out;
if (e.len == 0)
goto out;
for (j = 0; j < asreq->req_body.etype.len; j++) {
for (i = 0; i < e.len; i++) {
if (krb5_enctype_valid(context, e.val[i].etype) != 0)
continue;
if (asreq->req_body.etype.val[j] == e.val[i].etype) {
krb5_salt salt;
salt.salttype = KRB5_PW_SALT;
if (e.val[i].salt == NULL)
ret = krb5_get_pw_salt(context, client, &salt);
else {
salt.saltvalue = *e.val[i].salt;
ret = 0;
}
if (e.val[i].salttype)
salt.salttype = *e.val[i].salttype;
if (ret == 0) {
ret = set_paid(paid, context, e.val[i].etype,
salt.salttype,
salt.saltvalue.data,
salt.saltvalue.length,
NULL);
if (e.val[i].salt == NULL)
krb5_free_salt(context, salt);
}
if (ret == 0) {
free_ETYPE_INFO(&e);
return paid;
}
}
}
}
out:
free_ETYPE_INFO(&e);
return NULL;
}
static struct pa_info_data *
pa_pw_or_afs3_salt(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
heim_octet_string *data)
{
krb5_error_code ret;
if (paid->etype == KRB5_ENCTYPE_NULL)
return NULL;
if (krb5_enctype_valid(context, paid->etype) != 0)
return NULL;
ret = set_paid(paid, context,
paid->etype,
paid->salt.salttype,
data->data,
data->length,
NULL);
if (ret)
return NULL;
return paid;
}
static krb5_error_code
make_pa_enc_timestamp(krb5_context context, METHOD_DATA *md,
krb5_enctype etype, krb5_keyblock *key)
{
PA_ENC_TS_ENC p;
unsigned char *buf;
size_t buf_size;
size_t len = 0;
EncryptedData encdata;
krb5_error_code ret;
int32_t usec;
int usec2;
krb5_crypto crypto;
krb5_us_timeofday (context, &p.patimestamp, &usec);
usec2 = usec;
p.pausec = &usec2;
ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret) {
free(buf);
return ret;
}
ret = krb5_encrypt_EncryptedData(context,
crypto,
KRB5_KU_PA_ENC_TIMESTAMP,
buf,
len,
0,
&encdata);
free(buf);
krb5_crypto_destroy(context, crypto);
if (ret)
return ret;
ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
free_EncryptedData(&encdata);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_padata_add(context, md, KRB5_PADATA_ENC_TIMESTAMP, buf, len);
if (ret)
free(buf);
return ret;
}
static krb5_error_code
add_enc_ts_padata(krb5_context context,
METHOD_DATA *md,
krb5_principal client,
krb5_s2k_proc keyproc,
krb5_const_pointer keyseed,
krb5_enctype *enctypes,
unsigned netypes,
krb5_salt *salt,
krb5_data *s2kparams)
{
krb5_error_code ret;
krb5_salt salt2;
krb5_enctype *ep;
size_t i;
memset(&salt2, 0, sizeof(salt2));
if(salt == NULL) {
/* default to standard salt */
ret = krb5_get_pw_salt (context, client, &salt2);
if (ret)
return ret;
salt = &salt2;
}
if (!enctypes) {
enctypes = context->etypes;
netypes = 0;
for (ep = enctypes; *ep != (krb5_enctype)ETYPE_NULL; ep++)
netypes++;
}
for (i = 0; i < netypes; ++i) {
krb5_keyblock *key;
_krb5_debug(context, 5, "krb5_get_init_creds: using ENC-TS with enctype %d", enctypes[i]);
ret = (*keyproc)(context, enctypes[i], keyseed,
*salt, s2kparams, &key);
if (ret)
continue;
ret = make_pa_enc_timestamp (context, md, enctypes[i], key);
krb5_free_keyblock (context, key);
if (ret)
return ret;
}
if(salt == &salt2)
krb5_free_salt(context, salt2);
return 0;
}
static krb5_error_code
pa_data_to_md_ts_enc(krb5_context context,
const AS_REQ *a,
const krb5_principal client,
krb5_init_creds_context ctx,
struct pa_info_data *ppaid,
METHOD_DATA *md)
{
if (ctx->keyproc == NULL || ctx->keyseed == NULL)
return 0;
if (ppaid) {
add_enc_ts_padata(context, md, client,
ctx->keyproc, ctx->keyseed,
&ppaid->etype, 1,
&ppaid->salt, ppaid->s2kparams);
} else {
krb5_salt salt;
_krb5_debug(context, 5, "krb5_get_init_creds: pa-info not found, guessing salt");
/* make a v5 salted pa-data */
add_enc_ts_padata(context, md, client,
ctx->keyproc, ctx->keyseed,
a->req_body.etype.val, a->req_body.etype.len,
NULL, NULL);
/* make a v4 salted pa-data */
salt.salttype = KRB5_PW_SALT;
krb5_data_zero(&salt.saltvalue);
add_enc_ts_padata(context, md, client,
ctx->keyproc, ctx->keyseed,
a->req_body.etype.val, a->req_body.etype.len,
&salt, NULL);
}
return 0;
}
static krb5_error_code
pa_data_to_key_plain(krb5_context context,
const krb5_principal client,
krb5_init_creds_context ctx,
krb5_salt salt,
krb5_data *s2kparams,
krb5_enctype etype,
krb5_keyblock **key)
{
krb5_error_code ret;
ret = (*ctx->keyproc)(context, etype, ctx->keyseed,
salt, s2kparams, key);
return ret;
}
struct pkinit_context {
unsigned int win2k : 1;
unsigned int used_pkinit : 1;
};
static krb5_error_code
pa_data_to_md_pkinit(krb5_context context,
const AS_REQ *a,
const krb5_principal client,
int win2k,
krb5_init_creds_context ctx,
METHOD_DATA *md)
{
if (ctx->pk_init_ctx == NULL)
return 0;
#ifdef PKINIT
return _krb5_pk_mk_padata(context,
ctx->pk_init_ctx,
ctx->ic_flags,
win2k,
&a->req_body,
ctx->pk_nonce,
md);
#else
krb5_set_error_message(context, EINVAL,
N_("no support for PKINIT compiled in", ""));
return EINVAL;
#endif
}
static krb5_error_code
pkinit_configure_ietf(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx)
{
struct pkinit_context *pkinit_ctx = pa_ctx;
pkinit_ctx->win2k = 0;
if (ctx->pk_init_ctx == NULL)
return HEIM_ERR_PA_CANT_CONTINUE;
return 0;
}
static krb5_error_code
pkinit_configure_win(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx)
{
struct pkinit_context *pkinit_ctx = pa_ctx;
pkinit_ctx->win2k = 1;
pkinit_ctx->used_pkinit = 0;
if (ctx->pk_init_ctx == NULL)
return HEIM_ERR_PA_CANT_CONTINUE;
return 0;
}
static krb5_error_code
pkinit_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
const AS_REP *rep, const krb5_krbhst_info *hi, METHOD_DATA *in_md, METHOD_DATA *out_md)
{
krb5_error_code ret = HEIM_ERR_PA_CANT_CONTINUE;
struct pkinit_context *pkinit_ctx = pa_ctx;
if (rep == NULL) {
if (pkinit_ctx->used_pkinit) {
krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
"Already tried PKINIT(%s), looping",
pkinit_ctx->win2k ? "win2k" : "ietf");
} else {
ret = pa_data_to_md_pkinit(context, a, ctx->cred.client,
(pkinit_ctx->win2k != 0),
ctx, out_md);
if (ret == 0)
ret = HEIM_ERR_PA_CONTINUE_NEEDED;
pkinit_ctx->used_pkinit = 1;
}
} else if (pa) {
ret = _krb5_pk_rd_pa_reply(context,
a->req_body.realm,
ctx->pk_init_ctx,
rep->enc_part.etype,
hi,
ctx->pk_nonce,
&ctx->req_buffer,
pa,
&ctx->fast_state.reply_key);
if (ret == 0)
ctx->runflags.allow_save_as_reply_key = 1;
}
return ret;
}
static void
pkinit_release(void *pa_ctx)
{
}
/*
* GSS-API pre-authentication support
*/
struct pa_gss_context {
struct gss_ctx_id_t_desc_struct *context_handle;
int open;
};
static krb5_error_code
pa_gss_configure(krb5_context context,
krb5_init_creds_context ctx,
void *pa_ctx)
{
krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
struct pa_gss_context *pa_gss_ctx = pa_ctx;
if (gssic == NULL)
return HEIM_ERR_PA_CANT_CONTINUE;
pa_gss_ctx->context_handle = NULL;
pa_gss_ctx->open = 0;
return 0;
}
static krb5_error_code
pa_data_to_md_gss(krb5_context context,
const AS_REQ *a,
const krb5_creds *creds,
krb5_init_creds_context ctx,
struct pa_gss_context *pa_gss_ctx,
PA_DATA *pa,
METHOD_DATA *out_md)
{
krb5_error_code ret;
krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
krb5_data req_body;
krb5_data *input_token, output_token;
size_t len = 0;
krb5_data_zero(&req_body);
krb5_data_zero(&output_token);
input_token = pa ? &pa->padata_value : NULL;
if ((input_token == NULL || input_token->length == 0) &&
pa_gss_ctx->context_handle) {
krb5_set_error_message(context, HEIM_ERR_PA_CANT_CONTINUE,
"Missing GSS preauthentication data from KDC");
return HEIM_ERR_PA_CANT_CONTINUE;
}
ASN1_MALLOC_ENCODE(KDC_REQ_BODY, req_body.data, req_body.length,
&ctx->as_req.req_body, &len, ret);
if (ret)
goto out;
heim_assert(req_body.length == len, "ASN.1 internal error");
ret = gssic->step(context, gssic, creds, &pa_gss_ctx->context_handle,
ctx->flags, &req_body,
input_token, &output_token);
/*
* If FAST authenticated the KDC (which will be the case unless anonymous
* PKINIT was used without KDC certificate validation) then we can relax
* the mutual authentication requirement.
*/
if (ret == KRB5_MUTUAL_FAILED &&
(ctx->fast_state.flags & KRB5_FAST_EXPECTED) &&
(ctx->fast_state.flags & KRB5_FAST_KDC_VERIFIED))
ret = 0;
if (ret == 0) {
/*
* Always require a strengthen key if FAST was used, to avoid a MITM
* attack that could result in unintended privilege escalation should
* the KDC add positive authorization data from the armor ticket.
*/
if ((ctx->fast_state.flags & KRB5_FAST_EXPECTED) &&
ctx->fast_state.strengthen_key == NULL) {
krb5_set_error_message(context, HEIM_ERR_PA_CANT_CONTINUE,
"FAST GSS pre-authentication without strengthen key");
ret = KRB5_KDCREP_MODIFIED;
goto out;
}
pa_gss_ctx->open = 1;
}
if (output_token.length) {
ret = krb5_padata_add(context, out_md, KRB5_PADATA_GSS,
output_token.data, output_token.length);
if (ret)
goto out;
krb5_data_zero(&output_token);
}
out:
krb5_data_free(&output_token);
krb5_data_free(&req_body);
return ret;
}
static krb5_error_code
pa_gss_step(krb5_context context,
krb5_init_creds_context ctx,
void *pa_ctx,
PA_DATA *pa,
const AS_REQ *a,
const AS_REP *rep,
const krb5_krbhst_info *hi,
METHOD_DATA *in_md,
METHOD_DATA *out_md)
{
krb5_error_code ret;
krb5_principal cname;
krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
struct pa_gss_context *pa_gss_ctx = pa_ctx;
heim_assert(gssic != NULL, "invalid context passed to pa_gss_step");
if (!pa_gss_ctx->open) {
ret = pa_data_to_md_gss(context, a, &ctx->cred, ctx,
pa_gss_ctx, pa, out_md);
if (ret == HEIM_ERR_PA_CONTINUE_NEEDED && rep) {
krb5_set_error_message(context, KRB5_PREAUTH_FAILED,
"KDC sent AS-REP before GSS "
"pre-authentication completed");
ret = KRB5_KDCREP_MODIFIED;
} else if (ret == 0 && rep == NULL) {
ret = HEIM_ERR_PA_CONTINUE_NEEDED; /* odd number of legs */
}
if (ret)
return ret;
} else if (pa && pa->padata_value.length) {
krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
"Already completed GSS pre-authentication");
return KRB5_GET_IN_TKT_LOOP;
} else if (rep == NULL) {
krb5_set_error_message(context, KRB5_PREAUTH_FAILED,
"Completed GSS pre-authentication before KDC");
return KRB5_PREAUTH_FAILED;
}
heim_assert(pa_gss_ctx->open,
"GSS pre-authentication incomplete");
ret = gssic->finish(context, gssic, &ctx->cred,
pa_gss_ctx->context_handle, ctx->nonce,
rep->enc_part.etype, &cname,
&ctx->fast_state.reply_key);
if (ret)
return ret;
{
char *from = NULL;
char *to = NULL;
if (krb5_unparse_name(context, ctx->cred.client, &from) == 0 &&
krb5_unparse_name(context, cname, &to) == 0) {
_krb5_debug(context, 1, "pa_gss_step: %s as %s",
from, to);
krb5_xfree(from);
krb5_xfree(to);
}
}
if (krb5_principal_is_federated(context, ctx->cred.client)) {
/*
* The well-known federated name will be replaced with the cname
* in the AS-REP, but save the locally mapped initiator name in the
* cred for logging.
*/
krb5_free_principal(context, ctx->cred.client);
ctx->cred.client = cname;
ctx->ic_flags |= KRB5_INIT_CREDS_NO_C_CANON_CHECK;
} else {
krb5_free_principal(context, cname);
}
ctx->runflags.allow_save_as_reply_key = 1;
gssic->delete_sec_context(context, gssic, pa_gss_ctx->context_handle);
pa_gss_ctx->context_handle = NULL;
pa_gss_ctx->open = 0;
return 0;
}
static krb5_error_code
pa_gss_restart(krb5_context context,
krb5_init_creds_context ctx,
void *pa_ctx)
{
krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
struct pa_gss_context *pa_gss_ctx = pa_ctx;
if (gssic == NULL)
return HEIM_ERR_PA_CANT_CONTINUE;
gssic->delete_sec_context(context, gssic, pa_gss_ctx->context_handle);
pa_gss_ctx->context_handle = NULL;
pa_gss_ctx->open = 0;
return 0;
}
static void
pa_gss_release(void *pa_ctx)
{
}
krb5_error_code
_krb5_make_pa_enc_challenge(krb5_context context,
krb5_crypto crypto,
krb5_key_usage usage,
METHOD_DATA *md)
{
PA_ENC_TS_ENC p;
unsigned char *buf;
size_t buf_size;
size_t len = 0;
EncryptedData encdata;
krb5_error_code ret;
int32_t usec;
int usec2;
krb5_us_timeofday (context, &p.patimestamp, &usec);
usec2 = usec;
p.pausec = &usec2;
ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_encrypt_EncryptedData(context,
crypto,
usage,
buf,
len,
0,
&encdata);
free(buf);
if (ret)
return ret;
ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
free_EncryptedData(&encdata);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_padata_add(context, md, KRB5_PADATA_ENCRYPTED_CHALLENGE, buf, len);
if (ret)
free(buf);
return ret;
}
krb5_error_code
_krb5_validate_pa_enc_challenge(krb5_context context,
krb5_crypto crypto,
krb5_key_usage usage,
EncryptedData *enc_data,
const char *peer_name)
{
krb5_error_code ret;
krb5_data ts_data;
PA_ENC_TS_ENC p;
time_t timestamp;
int32_t usec;
size_t size;
ret = krb5_decrypt_EncryptedData(context, crypto, usage, enc_data, &ts_data);
if (ret)
return ret;
ret = decode_PA_ENC_TS_ENC(ts_data.data,
ts_data.length,
&p,
&size);
krb5_data_free(&ts_data);
if(ret){
ret = KRB5KDC_ERR_PREAUTH_FAILED;
_krb5_debug(context, 5, "Failed to decode PA-ENC-TS_ENC -- %s", peer_name);
goto out;
}
krb5_us_timeofday(context, &timestamp, &usec);
if (krb5_time_abs(timestamp, p.patimestamp) > context->max_skew) {
char client_time[100];
krb5_format_time(context, p.patimestamp,
client_time, sizeof(client_time), TRUE);
ret = KRB5KRB_AP_ERR_SKEW;
_krb5_debug(context, 0, "Too large time skew, "
"client time %s is out by %u > %d seconds -- %s",
client_time,
(unsigned)krb5_time_abs(timestamp, p.patimestamp),
(int)context->max_skew,
peer_name);
} else {
ret = 0;
}
out:
free_PA_ENC_TS_ENC(&p);
return ret;
}
static struct pa_info_data *
process_pa_info(krb5_context, const krb5_principal, const AS_REQ *, struct pa_info_data *, METHOD_DATA *);
static krb5_error_code
enc_chal_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
const AS_REP *rep, const krb5_krbhst_info *hi, METHOD_DATA *in_md, METHOD_DATA *out_md)
{
struct pa_info_data paid, *ppaid;
krb5_keyblock challengekey;
krb5_data pepper1, pepper2;
krb5_crypto crypto = NULL;
krb5_enctype aenctype;
krb5_error_code ret;
memset(&paid, 0, sizeof(paid));
if (rep == NULL)
paid.etype = KRB5_ENCTYPE_NULL;
else
paid.etype = rep->enc_part.etype;
ppaid = process_pa_info(context, ctx->cred.client, a, &paid, in_md);
/*
* If we don't have ppaid, ts because the KDC have not sent any
* salt info, lets to the first roundtrip so the KDC have a chance
* to send any.
*/
if (ppaid == NULL) {
_krb5_debug(context, 5, "no ppaid found");
return HEIM_ERR_PA_CONTINUE_NEEDED;
}
if (ppaid->etype == KRB5_ENCTYPE_NULL) {
return HEIM_ERR_PA_CANT_CONTINUE;
}
if (ctx->fast_state.reply_key)
krb5_free_keyblock(context, ctx->fast_state.reply_key);
ret = pa_data_to_key_plain(context, ctx->cred.client, ctx,
ppaid->salt, ppaid->s2kparams, ppaid->etype,
&ctx->fast_state.reply_key);
free_paid(context, &paid);
if (ret) {
_krb5_debug(context, 5, "enc-chal: failed to build key");
return ret;
}
ret = krb5_crypto_init(context, ctx->fast_state.reply_key, 0, &crypto);
if (ret)
return ret;
krb5_crypto_getenctype(context, ctx->fast_state.armor_crypto, &aenctype);
pepper1.data = rep ? "kdcchallengearmor" : "clientchallengearmor";
pepper1.length = strlen(pepper1.data);
pepper2.data = "challengelongterm";
pepper2.length = strlen(pepper2.data);
ret = krb5_crypto_fx_cf2(context, ctx->fast_state.armor_crypto, crypto,
&pepper1, &pepper2, aenctype,
&challengekey);
krb5_crypto_destroy(context, crypto);
if (ret)
return ret;
ret = krb5_crypto_init(context, &challengekey, 0, &crypto);
krb5_free_keyblock_contents(context, &challengekey);
if (ret)
return ret;
if (rep) {
EncryptedData enc_data;
size_t size;
if (ret) {
_krb5_debug(context, 5, "enc-chal: failed to create reply key");
return ret;
}
_krb5_debug(context, 5, "ENC_CHAL rep key");
if (ctx->fast_state.strengthen_key == NULL) {
krb5_crypto_destroy(context, crypto);
_krb5_debug(context, 5, "ENC_CHAL w/o strengthen_key");
return KRB5_KDCREP_MODIFIED;
}
if (pa == NULL) {
krb5_crypto_destroy(context, crypto);
_krb5_debug(context, 0, "KDC response missing");
return HEIM_ERR_PA_CANT_CONTINUE;
}
ret = decode_EncryptedData(pa->padata_value.data,
pa->padata_value.length,
&enc_data,
&size);
if (ret) {
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
_krb5_debug(context, 5, "Failed to decode ENC_CHAL KDC reply");
return ret;
}
ret = _krb5_validate_pa_enc_challenge(context, crypto,
KRB5_KU_ENC_CHALLENGE_KDC,
&enc_data,
"KDC");
free_EncryptedData(&enc_data);
krb5_crypto_destroy(context, crypto);
return ret;
} else {
ret = _krb5_make_pa_enc_challenge(context, crypto,
KRB5_KU_ENC_CHALLENGE_CLIENT,
out_md);
krb5_crypto_destroy(context, crypto);
if (ret) {
_krb5_debug(context, 5, "enc-chal: failed build enc challenge");
return ret;
}
return HEIM_ERR_PA_CONTINUE_NEEDED;
}
}
struct enc_ts_context {
int used_pa_types;
#define USED_ENC_TS_GUESS 4
#define USED_ENC_TS_INFO 8
#define USED_ENC_TS_RENEG 16
krb5_principal user;
};
static krb5_error_code
enc_ts_restart(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx)
{
struct enc_ts_context *pactx = (struct enc_ts_context *)pa_ctx;
pactx->used_pa_types = 0;
krb5_free_principal(context, pactx->user);
pactx->user = NULL;
return 0;
}
static krb5_error_code
enc_ts_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa,
const AS_REQ *a,
const AS_REP *rep,
const krb5_krbhst_info *hi,
METHOD_DATA *in_md, METHOD_DATA *out_md)
{
struct enc_ts_context *pactx = (struct enc_ts_context *)pa_ctx;
struct pa_info_data paid, *ppaid;
krb5_error_code ret;
const char *state;
unsigned flag;
/*
* Keep track of the user we used so that we can restart
* authentication when we get referrals.
*/
if (pactx->user && !krb5_principal_compare(context, pactx->user, ctx->cred.client)) {
pactx->used_pa_types = 0;
krb5_free_principal(context, pactx->user);
pactx->user = NULL;
}
if (pactx->user == NULL) {
ret = krb5_copy_principal(context, ctx->cred.client, &pactx->user);
if (ret)
return ret;
}
memset(&paid, 0, sizeof(paid));
if (rep == NULL)
paid.etype = KRB5_ENCTYPE_NULL;
else
paid.etype = rep->enc_part.etype;
ppaid = process_pa_info(context, ctx->cred.client, a, &paid, in_md);
if (rep) {
/*
* Some KDC's don't send salt info in the reply when there is
* success pre-auth happned before, so use cached copy (or
* even better, if there is just one pre-auth, save reply-key).
*/
if (ppaid == NULL && ctx->paid.etype != KRB5_ENCTYPE_NULL) {
ppaid = &ctx->paid;
} else if (ppaid == NULL) {
_krb5_debug(context, 0, "no paid when building key, build a default salt structure ?");
return HEIM_ERR_PA_CANT_CONTINUE;
}
ret = pa_data_to_key_plain(context, ctx->cred.client, ctx,
ppaid->salt, ppaid->s2kparams, rep->enc_part.etype,
&ctx->fast_state.reply_key);
free_paid(context, &paid);
return ret;
}
/*
* If we don't have ppaid, ts because the KDC have not sent any
* salt info, lets to the first roundtrip so the KDC have a chance
* to send any.
*
* Don't bother guessing, it sounds like a good idea until you run
* into KDCs that are doing failed auth counting based on the
* ENC_TS tries.
*
* Stashing the salt for the next run is a diffrent issue and
* could be considered in the future.
*/
if (ppaid == NULL) {
_krb5_debug(context, 5,
"TS-ENC: waiting for KDC to set pw-salt/etype_info{,2}");
return HEIM_ERR_PA_CONTINUE_NEEDED;
}
if (ppaid->etype == KRB5_ENCTYPE_NULL) {
free_paid(context, &paid);
_krb5_debug(context, 5,
"TS-ENC: kdc proposes enctype NULL ?");
return HEIM_ERR_PA_CANT_CONTINUE;
}
/*
* We have to allow the KDC to re-negotiate the PA-TS data
* once, this is since the in the case of a windows read only
* KDC that doesn't have the keys simply guesses what the
* master is supposed to support. In the case where this
* breaks in when the RO-KDC is a newer version the the RW-KDC
* and the RO-KDC announced a enctype that the older doesn't
* support.
*/
if (pactx->used_pa_types & USED_ENC_TS_INFO) {
flag = USED_ENC_TS_RENEG;
state = "reneg";
} else {
flag = USED_ENC_TS_INFO;
state = "info";
}
if (pactx->used_pa_types & flag) {
free_paid(context, &paid);
krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
"Already tried ENC-TS-%s, looping", state);
return KRB5_GET_IN_TKT_LOOP;
}
pactx->used_pa_types |= flag;
free_paid(context, &ctx->paid);
ctx->paid = *ppaid;
ret = pa_data_to_md_ts_enc(context, a, ctx->cred.client, ctx, ppaid, out_md);
if (ret)
return ret;
return HEIM_ERR_PA_CONTINUE_NEEDED;
}
static void
enc_ts_release(void *pa_ctx)
{
struct enc_ts_context *pactx = (struct enc_ts_context *)pa_ctx;
if (pactx->user)
krb5_free_principal(NULL, pactx->user);
}
static krb5_error_code
pa_pac_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
const AS_REP *rep, const krb5_krbhst_info *hi,
METHOD_DATA *in_md, METHOD_DATA *out_md)
{
size_t len = 0, length;
krb5_error_code ret;
PA_PAC_REQUEST req;
void *buf;
switch (ctx->req_pac) {
case KRB5_INIT_CREDS_TRISTATE_UNSET:
return 0; /* don't bother */
case KRB5_INIT_CREDS_TRISTATE_TRUE:
req.include_pac = 1;
break;
case KRB5_INIT_CREDS_TRISTATE_FALSE:
req.include_pac = 0;
}
ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length,
&req, &len, ret);
if (ret)
return ret;
heim_assert(len == length, "internal error in ASN.1 encoder");
ret = krb5_padata_add(context, out_md, KRB5_PADATA_PA_PAC_REQUEST, buf, len);
if (ret)
free(buf);
return 0;
}
static krb5_error_code
pa_enc_pa_rep_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
const AS_REP *rep, const krb5_krbhst_info *hi,
METHOD_DATA *in_md, METHOD_DATA *out_md)
{
if (ctx->runflags.allow_enc_pa_rep)
return krb5_padata_add(context, out_md, KRB5_PADATA_REQ_ENC_PA_REP, NULL, 0);
return 0;
}
static krb5_error_code
pa_fx_cookie_step(krb5_context context,
krb5_init_creds_context ctx,
void *pa_ctx,
PA_DATA *pa,
const AS_REQ *a,
const AS_REP *rep,
const krb5_krbhst_info *hi,
METHOD_DATA *in_md,
METHOD_DATA *out_md)
{
krb5_error_code ret;
void *cookie;
PA_DATA *pad;
int idx = 0;
pad = krb5_find_padata(in_md->val, in_md->len, KRB5_PADATA_FX_COOKIE, &idx);
if (pad == NULL) {
/*
* RFC 6113 5.4.3: PA-FX-COOKIE MUST be included if the KDC
* expects at least one more message from the client.
*/
if (ctx->error.error_code == KRB5_KDC_ERR_MORE_PREAUTH_DATA_REQUIRED)
return KRB5_PREAUTH_FAILED;
else
return 0;
}
cookie = malloc(pad->padata_value.length);
if (cookie == NULL)
return krb5_enomem(context);
memcpy(cookie, pad->padata_value.data, pad->padata_value.length);
ret = krb5_padata_add(context, out_md, KRB5_PADATA_FX_COOKIE,
cookie, pad->padata_value.length);
if (ret)
free(cookie);
else
_krb5_debug(context, 5, "Mirrored FX-COOKIE to KDC");
return ret;
}
typedef struct pa_info_data *(*pa_salt_info_f)(krb5_context, const krb5_principal, const AS_REQ *, struct pa_info_data *, heim_octet_string *);
typedef krb5_error_code (*pa_configure_f)(krb5_context, krb5_init_creds_context, void *);
typedef krb5_error_code (*pa_restart_f)(krb5_context, krb5_init_creds_context, void *);
typedef krb5_error_code (*pa_step_f)(krb5_context, krb5_init_creds_context, void *, PA_DATA *, const AS_REQ *, const AS_REP *, const krb5_krbhst_info *, METHOD_DATA *, METHOD_DATA *);
typedef void (*pa_release_f)(void *);
struct patype {
int type;
char *name;
int flags;
#define PA_F_ANNOUNCE 1
#define PA_F_CONFIG 2
#define PA_F_FAST 4 /* available inside FAST */
#define PA_F_NOT_FAST 8 /* only available without FAST */
size_t pa_ctx_size;
pa_salt_info_f salt_info;
/**
* Return 0 if the PA-mechanism is available and optionally set pa_ctx pointer to non-NULL.
*/
pa_configure_f configure;
/**
* Return 0 if the PA-mechanism can be restarted (time skew, referrals, etc)
*/
pa_restart_f restart;
/**
* Return 0 if the when complete, HEIM_ERR_PA_CONTINUE_NEEDED if more steps are require
*/
pa_step_f step;
pa_release_f release;
} patypes[] = {
{
KRB5_PADATA_PK_AS_REP,
"PKINIT(IETF)",
PA_F_FAST | PA_F_NOT_FAST,
sizeof(struct pkinit_context),
NULL,
pkinit_configure_ietf,
NULL,
pkinit_step,
pkinit_release
},
{
KRB5_PADATA_PK_AS_REP_19,
"PKINIT(win)",
PA_F_FAST | PA_F_NOT_FAST,
sizeof(struct pkinit_context),
NULL,
pkinit_configure_win,
NULL,
pkinit_step,
pkinit_release
},
{
KRB5_PADATA_GSS,
"GSS",
PA_F_FAST | PA_F_NOT_FAST,
sizeof(struct pa_gss_context),
NULL,
pa_gss_configure,
pa_gss_restart,
pa_gss_step,
pa_gss_release
},
{
KRB5_PADATA_ENCRYPTED_CHALLENGE,
"ENCRYPTED_CHALLENGE",
PA_F_FAST,
0,
NULL,
NULL,
NULL,
enc_chal_step,
NULL
},
{
KRB5_PADATA_ENC_TIMESTAMP,
"ENCRYPTED_TIMESTAMP",
PA_F_NOT_FAST,
sizeof(struct enc_ts_context),
NULL,
NULL,
enc_ts_restart,
enc_ts_step,
enc_ts_release
},
{
KRB5_PADATA_PA_PAC_REQUEST,
"PA_PAC_REQUEST",
PA_F_CONFIG,
0,
NULL,
NULL,
NULL,
pa_pac_step,
NULL
},
{
KRB5_PADATA_REQ_ENC_PA_REP,
"REQ-ENC-PA-REP",
PA_F_CONFIG,
0,
NULL,
NULL,
NULL,
pa_enc_pa_rep_step,
NULL
},
{
KRB5_PADATA_FX_COOKIE,
"FX-COOKIE",
PA_F_CONFIG,
0,
NULL,
NULL,
NULL,
pa_fx_cookie_step,
NULL
},
#define patype_salt(n, f) { KRB5_PADATA_##n, #n, 0, 0, f, NULL, NULL, NULL, NULL }
patype_salt(ETYPE_INFO2, pa_etype_info2),
patype_salt(ETYPE_INFO, pa_etype_info),
patype_salt(PW_SALT, pa_pw_or_afs3_salt),
patype_salt(AFS3_SALT, pa_pw_or_afs3_salt),
#undef patype_salt
/* below are just for pretty printing */
#define patype_info(n) { KRB5_PADATA_##n, #n, 0, 0, NULL, NULL, NULL, NULL, NULL }
patype_info(AUTHENTICATION_SET),
patype_info(AUTH_SET_SELECTED),
patype_info(FX_FAST),
patype_info(FX_ERROR),
patype_info(PKINIT_KX),
patype_info(PK_AS_REQ)
#undef patype_info
};
static const char *
get_pa_type_name(int type)
{
size_t n;
for (n = 0; n < sizeof(patypes)/sizeof(patypes[0]); n++)
if (type == patypes[n].type)
return patypes[n].name;
return "unknown";
}
/*
*
*/
struct pa_auth_mech {
struct patype *patype;
struct pa_auth_mech *next; /* when doing authentication sets */
char pactx[1];
};
/*
*
*/
static struct pa_info_data *
process_pa_info(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
METHOD_DATA *md)
{
struct pa_info_data *p = NULL;
PA_DATA *pa;
size_t i;
if (md == NULL)
return NULL;
for (i = 0; p == NULL && i < sizeof(patypes)/sizeof(patypes[0]); i++) {
int idx = 0;
if (patypes[i].salt_info == NULL)
continue;
pa = krb5_find_padata(md->val, md->len, patypes[i].type, &idx);
if (pa == NULL)
continue;
paid->salt.salttype = (krb5_salttype)patypes[i].type;
p = patypes[i].salt_info(context, client, asreq, paid, &pa->padata_value);
}
return p;
}
static void
pa_announce(krb5_context context,
int types,
krb5_init_creds_context ctx,
METHOD_DATA *in_md,
METHOD_DATA *out_md)
{
size_t n;
for (n = 0; n < sizeof(patypes)/sizeof(patypes[0]); n++) {
if ((patypes[n].flags & types) == 0)
continue;
if (patypes[n].step)
patypes[n].step(context, ctx, NULL, NULL, NULL, NULL, NULL, in_md, out_md);
else
krb5_padata_add(context, out_md, patypes[n].type, NULL, 0);
}
}
static void
mech_dealloc(void *ctx)
{
struct pa_auth_mech *pa_mech = ctx;
if (pa_mech->patype->release)
pa_mech->patype->release((void *)&pa_mech->pactx[0]);
}
struct heim_type_data pa_auth_mech_object = {
HEIM_TID_PA_AUTH_MECH,
"heim-pa-mech-context",
NULL,
mech_dealloc,
NULL,
NULL,
NULL,
NULL
};
static struct pa_auth_mech *
pa_mech_create(krb5_context context, krb5_init_creds_context ctx, int pa_type)
{
struct pa_auth_mech *pa_mech;
struct patype *patype = NULL;
size_t n;
for (n = 0; patype == NULL && n < sizeof(patypes)/sizeof(patypes[0]); n++) {
if (patypes[n].type == pa_type)
patype = &patypes[n];
}
if (patype == NULL)
return NULL;
pa_mech = _heim_alloc_object(&pa_auth_mech_object, sizeof(*pa_mech) - 1 + patype->pa_ctx_size);
if (pa_mech == NULL)
return NULL;
pa_mech->patype = patype;
if (pa_mech->patype->configure) {
krb5_error_code ret;
ret = pa_mech->patype->configure(context, ctx, &pa_mech->pactx[0]);
if (ret) {
heim_release(pa_mech);
return NULL;
}
}
_krb5_debug(context, 5, "Adding PA mech: %s", patype->name);
return pa_mech;
}
static void
pa_mech_add(krb5_context context, krb5_init_creds_context ctx, int pa_type)
{
struct pa_auth_mech *mech;
mech = pa_mech_create(context, ctx, pa_type);
if (mech) {
heim_array_append_value(ctx->available_pa_mechs, mech);
heim_release(mech);
}
}
static krb5_error_code
pa_configure(krb5_context context,
krb5_init_creds_context ctx,
METHOD_DATA *in_md)
{
ctx->available_pa_mechs = heim_array_create();
if (ctx->gss_init_ctx) {
pa_mech_add(context, ctx, KRB5_PADATA_GSS);
} else if (ctx->pk_init_ctx) {
pa_mech_add(context, ctx, KRB5_PADATA_PK_AS_REP);
pa_mech_add(context, ctx, KRB5_PADATA_PK_AS_REP_19);
} else if (ctx->keyproc || ctx->keyseed || ctx->prompter) {
pa_mech_add(context, ctx, KRB5_PADATA_ENCRYPTED_CHALLENGE);
pa_mech_add(context, ctx, KRB5_PADATA_ENC_TIMESTAMP);
}
/* XXX setup context based on KDC reply */
return 0;
}
static krb5_error_code
pa_restart(krb5_context context,
krb5_init_creds_context ctx)
{
krb5_error_code ret = HEIM_ERR_PA_CANT_CONTINUE;
if (ctx->pa_mech && ctx->pa_mech->patype->restart)
ret = ctx->pa_mech->patype->restart(context, ctx, (void *)&ctx->pa_mech->pactx[0]);
return ret;
}
static krb5_error_code
pa_step(krb5_context context,
krb5_init_creds_context ctx,
const AS_REQ *a,
const AS_REP *rep,
const krb5_krbhst_info *hi,
METHOD_DATA *in_md,
METHOD_DATA *out_md)
{
krb5_error_code ret;
PA_DATA *pa = NULL;
int idx;
next:
do {
if (ctx->pa_mech == NULL) {
size_t len = heim_array_get_length(ctx->available_pa_mechs);
if (len == 0) {
_krb5_debug(context, 0, "no more available_pa_mechs to try");
return HEIM_ERR_NO_MORE_PA_MECHS;
}
ctx->pa_mech = heim_array_copy_value(ctx->available_pa_mechs, 0);
heim_array_delete_value(ctx->available_pa_mechs, 0);
}
if (ctx->fast_state.armor_crypto) {
if ((ctx->pa_mech->patype->flags & PA_F_FAST) == 0) {
_krb5_debug(context, 0, "pa-mech %s dropped under FAST (not supported)",
ctx->pa_mech->patype->name);
heim_release(ctx->pa_mech);
ctx->pa_mech = NULL;
continue;
}
} else {
if ((ctx->pa_mech->patype->flags & PA_F_NOT_FAST) == 0) {
_krb5_debug(context, 0, "dropped pa-mech %s since not running under FAST",
ctx->pa_mech->patype->name);
heim_release(ctx->pa_mech);
ctx->pa_mech = NULL;
continue;
}
}
_krb5_debug(context, 0, "pa-mech trying: %s, searching for %d",
ctx->pa_mech->patype->name, ctx->pa_mech->patype->type);
idx = 0;
if (in_md)
pa = krb5_find_padata(in_md->val, in_md->len, ctx->pa_mech->patype->type, &idx);
else
pa = NULL;
} while (ctx->pa_mech == NULL);
_krb5_debug(context, 5, "Stepping pa-mech: %s", ctx->pa_mech->patype->name);
ret = ctx->pa_mech->patype->step(context, ctx, (void *)&ctx->pa_mech->pactx[0], pa, a, rep, hi, in_md, out_md);
_krb5_debug(context, 10, "PA type %s returned %d", ctx->pa_mech->patype->name, ret);
if (ret == 0) {
struct pa_auth_mech *next_pa = ctx->pa_mech->next;
if (next_pa) {
_krb5_debug(context, 5, "Next PA type in set is: %s",
next_pa->patype->name);
ret = HEIM_ERR_PA_CONTINUE_NEEDED;
} else if (rep == NULL) {
_krb5_debug(context, 5, "PA %s done, but no ticket in sight!!!",
ctx->pa_mech->patype->name);
ret = HEIM_ERR_PA_CANT_CONTINUE;
} else {
ctx->pa_used = ctx->pa_mech->patype->name;
}
heim_retain(next_pa);
heim_release(ctx->pa_mech);
ctx->pa_mech = next_pa;
}
if (ret == HEIM_ERR_PA_CANT_CONTINUE) {
if (ctx->pa_mech) {
_krb5_debug(context, 5, "Dropping PA type %s", ctx->pa_mech->patype->name);
heim_release(ctx->pa_mech);
ctx->pa_mech = NULL;
}
goto next;
} else if (ret == HEIM_ERR_PA_CONTINUE_NEEDED) {
_krb5_debug(context, 5, "Continue needed for %s", ctx->pa_mech->patype->name);
} else if (ret != 0) {
_krb5_debug(context, 5, "Other error from mech %s: %d", ctx->pa_mech->patype->name, ret);
heim_release(ctx->pa_mech);
ctx->pa_mech = NULL;
}
return ret;
}
static void
log_kdc_pa_types(krb5_context context, METHOD_DATA *in_md)
{
if (_krb5_have_debug(context, 5)) {
unsigned i;
_krb5_debug(context, 5, "KDC sent %d patypes", in_md->len);
for (i = 0; i < in_md->len; i++)
_krb5_debug(context, 5, "KDC sent PA-DATA type: %d (%s)",
in_md->val[i].padata_type,
get_pa_type_name(in_md->val[i].padata_type));
}
}
/*
* Assumes caller always will free `out_md', even on error.
*/
static krb5_error_code
process_pa_data_to_md(krb5_context context,
const krb5_creds *creds,
const AS_REQ *a,
krb5_init_creds_context ctx,
METHOD_DATA *in_md,
METHOD_DATA **out_md)
{
krb5_error_code ret;
ALLOC(*out_md, 1);
if (*out_md == NULL) {
return krb5_enomem(context);
}
(*out_md)->len = 0;
(*out_md)->val = NULL;
log_kdc_pa_types(context, in_md);
ret = pa_step(context, ctx, a, NULL, NULL, in_md, *out_md);
if (ret == HEIM_ERR_PA_CONTINUE_NEEDED) {
_krb5_debug(context, 0, "pamech need more stepping");
} else if (ret == 0) {
_krb5_debug(context, 0, "pamech done step");
} else {
return ret;
}
/*
* Send announcement (what we support) and configuration (user
* introduced behavior change)
*/
pa_announce(context, PA_F_ANNOUNCE|PA_F_CONFIG, ctx, in_md, *out_md);
/*
*
*/
if ((*out_md)->len == 0) {
free(*out_md);
*out_md = NULL;
}
return 0;
}
static krb5_error_code
process_pa_data_to_key(krb5_context context,
krb5_init_creds_context ctx,
krb5_creds *creds,
AS_REQ *a,
AS_REP *rep,
const krb5_krbhst_info *hi,
krb5_keyblock **key)
{
struct pa_info_data paid, *ppaid = NULL;
krb5_error_code ret;
krb5_enctype etype = rep->enc_part.etype;
memset(&paid, 0, sizeof(paid));
if (rep->padata)
log_kdc_pa_types(context, rep->padata);
if (rep->padata) {
paid.etype = etype;
ppaid = process_pa_info(context, creds->client, a, &paid,
rep->padata);
}
if (ppaid == NULL) {
if (ctx->paid.etype == KRB5_ENCTYPE_NULL) {
ctx->paid.etype = etype;
ctx->paid.s2kparams = NULL;
ret = krb5_get_pw_salt (context, creds->client, &ctx->paid.salt);
if (ret)
return ret;
}
}
ret = pa_step(context, ctx, a, rep, hi, rep->padata, NULL);
if (ret == HEIM_ERR_PA_CONTINUE_NEEDED) {
_krb5_debug(context, 0, "In final stretch and pa require more stepping ?");
return ret;
} else if (ret == 0) {
_krb5_debug(context, 0, "final pamech done step");
goto out;
} else {
return ret;
}
out:
free_paid(context, &paid);
return ret;
}
/*
*
*/
static krb5_error_code
capture_lkdc_domain(krb5_context context,
krb5_init_creds_context ctx)
{
size_t len;
len = strlen(_krb5_wellknown_lkdc);
if (ctx->kdc_hostname != NULL ||
strncmp(ctx->cred.client->realm, _krb5_wellknown_lkdc, len) != 0 ||
ctx->cred.client->realm[len] != ':')
return 0;
ctx->kdc_hostname = strdup(&ctx->cred.client->realm[len + 1]);
_krb5_debug(context, 5, "krb5_get_init_creds: setting LKDC hostname to: %s",
ctx->kdc_hostname);
return 0;
}
/**
* Start a new context to get a new initial credential.
*
* @param context A Kerberos 5 context.
* @param client The Kerberos principal to get the credential for, if
* NULL is given, the default principal is used as determined by
* krb5_get_default_principal().
* @param prompter
* @param prompter_data
* @param start_time the time the ticket should start to be valid or 0 for now.
* @param options a options structure, can be NULL for default options.
* @param rctx A new allocated free with krb5_init_creds_free().
*
* @return 0 for success or an Kerberos 5 error code, see krb5_get_error_message().
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_init(krb5_context context,
krb5_principal client,
krb5_prompter_fct prompter,
void *prompter_data,
krb5_deltat start_time,
krb5_get_init_creds_opt *options,
krb5_init_creds_context *rctx)
{
krb5_init_creds_context ctx;
krb5_error_code ret;
*rctx = NULL;
ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL)
return krb5_enomem(context);
ret = get_init_creds_common(context, client, prompter, prompter_data,
start_time, options, ctx);
if (ret) {
free(ctx);
return ret;
}
/* Set a new nonce. */
/* FIXME should generate a new nonce for each AS-REQ */
krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce));
ctx->nonce &= 0x7fffffff;
/* XXX these just needs to be the same when using Windows PK-INIT */
ctx->pk_nonce = ctx->nonce;
ctx->prompter = prompter;
ctx->prompter_data = prompter_data;
/* pick up hostname from LKDC realm name */
ret = capture_lkdc_domain(context, ctx);
if (ret) {
free_init_creds_ctx(context, ctx);
return ret;
}
ctx->runflags.allow_enc_pa_rep = 1;
ctx->fast_state.flags |= KRB5_FAST_AS_REQ;
*rctx = ctx;
return ret;
}
/**
* Set the KDC hostname for the initial request, it will not be
* considered in referrals to another KDC.
*
* @param context a Kerberos 5 context.
* @param ctx a krb5_init_creds_context context.
* @param hostname the hostname for the KDC of realm
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
krb5_error_code KRB5_LIB_FUNCTION
krb5_init_creds_set_kdc_hostname(krb5_context context,
krb5_init_creds_context ctx,
const char *hostname)
{
if (ctx->kdc_hostname)
free(ctx->kdc_hostname);
ctx->kdc_hostname = strdup(hostname);
if (ctx->kdc_hostname == NULL)
return krb5_enomem(context);
return 0;
}
/**
* Set the sitename for the request
*
*/
krb5_error_code KRB5_LIB_FUNCTION
krb5_init_creds_set_sitename(krb5_context context,
krb5_init_creds_context ctx,
const char *sitename)
{
if (ctx->sitename)
free(ctx->sitename);
ctx->sitename = strdup(sitename);
if (ctx->sitename == NULL)
return krb5_enomem(context);
return 0;
}
/**
* Sets the service that the is requested. This call is only neede for
* special initial tickets, by default the a krbtgt is fetched in the default realm.
*
* @param context a Kerberos 5 context.
* @param ctx a krb5_init_creds_context context.
* @param service the service given as a string, for example
* "kadmind/admin". If NULL, the default krbtgt in the clients
* realm is set.
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_service(krb5_context context,
krb5_init_creds_context ctx,
const char *service)
{
krb5_const_realm client_realm;
krb5_principal principal;
krb5_error_code ret;
client_realm = krb5_principal_get_realm (context, ctx->cred.client);
if (service) {
ret = krb5_parse_name (context, service, &principal);
if (ret)
return ret;
krb5_principal_set_realm (context, principal, client_realm);
} else {
ret = krb5_make_principal(context, &principal,
client_realm, KRB5_TGS_NAME, client_realm,
NULL);
if (ret)
return ret;
}
/*
* This is for Windows RODC that are picky about what name type
* the server principal have, and the really strange part is that
* they are picky about the AS-REQ name type and not the TGS-REQ
* later. Oh well.
*/
if (krb5_principal_is_krbtgt(context, principal))
krb5_principal_set_type(context, principal, KRB5_NT_SRV_INST);
krb5_free_principal(context, ctx->cred.server);
ctx->cred.server = principal;
return 0;
}
/**
* Sets the password that will use for the request.
*
* @param context a Kerberos 5 context.
* @param ctx ctx krb5_init_creds_context context.
* @param password the password to use.
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_password(krb5_context context,
krb5_init_creds_context ctx,
const char *password)
{
if (ctx->password) {
size_t len;
len = strlen(ctx->password);
memset_s(ctx->password, len, 0, len);
free(ctx->password);
}
if (password) {
ctx->password = strdup(password);
if (ctx->password == NULL)
return krb5_enomem(context);
ctx->keyseed = (void *) ctx->password;
} else {
ctx->keyseed = NULL;
ctx->password = NULL;
}
return 0;
}
static krb5_error_code KRB5_CALLCONV
keytab_key_proc(krb5_context context, krb5_enctype enctype,
krb5_const_pointer keyseed,
krb5_salt salt, krb5_data *s2kparms,
krb5_keyblock **key)
{
krb5_keytab_key_proc_args *args = rk_UNCONST(keyseed);
krb5_keytab keytab = args->keytab;
krb5_principal principal = args->principal;
krb5_error_code ret;
krb5_keytab real_keytab;
krb5_keytab_entry entry;
if (keytab == NULL) {
ret = krb5_kt_default(context, &real_keytab);
if (ret)
return ret;
} else
real_keytab = keytab;
ret = krb5_kt_get_entry (context, real_keytab, principal,
0, enctype, &entry);
if (keytab == NULL)
krb5_kt_close (context, real_keytab);
if (ret)
return ret;
ret = krb5_copy_keyblock (context, &entry.keyblock, key);
krb5_kt_free_entry(context, &entry);
return ret;
}
/**
* Set the keytab to use for authentication.
*
* @param context a Kerberos 5 context.
* @param ctx ctx krb5_init_creds_context context.
* @param keytab the keytab to read the key from.
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_keytab(krb5_context context,
krb5_init_creds_context ctx,
krb5_keytab keytab)
{
krb5_keytab_key_proc_args *a;
krb5_keytab_entry entry;
krb5_kt_cursor cursor;
krb5_enctype *etypes = NULL;
krb5_error_code ret;
size_t netypes = 0;
int kvno = 0, found = 0;
unsigned n;
a = malloc(sizeof(*a));
if (a == NULL)
return krb5_enomem(context);
a->principal = ctx->cred.client;
a->keytab = keytab;
ctx->keytab_data = a;
ctx->keyseed = (void *)a;
ctx->keyproc = keytab_key_proc;
/*
* We need to the KDC what enctypes we support for this keytab,
* esp if the keytab is really a password based entry, then the
* KDC might have more enctypes in the database then what we have
* in the keytab.
*/
ret = krb5_kt_start_seq_get(context, keytab, &cursor);
if(ret)
goto out;
while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0){
void *ptr;
if (!krb5_principal_compare(context, entry.principal, ctx->cred.client))
goto next;
found = 1;
/* check if we ahve this kvno already */
if (entry.vno > kvno) {
/* remove old list of etype */
if (etypes)
free(etypes);
etypes = NULL;
netypes = 0;
kvno = entry.vno;
} else if (entry.vno != kvno)
goto next;
/* check if enctype is supported */
if (krb5_enctype_valid(context, entry.keyblock.keytype) != 0)
goto next;
/*
* If user already provided a enctype list, use that as an
* additonal filter.
*/
if (ctx->etypes) {
for (n = 0; ctx->etypes[n] != KRB5_ENCTYPE_NULL; n++) {
if (ctx->etypes[n] == entry.keyblock.keytype)
break;
}
if (ctx->etypes[n] == KRB5_ENCTYPE_NULL)
goto next;
}
/* add enctype to supported list */
ptr = realloc(etypes, sizeof(etypes[0]) * (netypes + 2));
if (ptr == NULL) {
free(etypes);
ret = krb5_enomem(context);
goto out;
}
etypes = ptr;
etypes[netypes] = entry.keyblock.keytype;
etypes[netypes + 1] = ETYPE_NULL;
netypes++;
next:
krb5_kt_free_entry(context, &entry);
}
krb5_kt_end_seq_get(context, keytab, &cursor);
if (etypes) {
if (ctx->etypes)
free(ctx->etypes);
ctx->etypes = etypes;
}
out:
if (!found) {
if (ret == 0)
ret = KRB5_KT_NOTFOUND;
_krb5_kt_principal_not_found(context, ret, keytab, ctx->cred.client, 0, 0);
}
return ret;
}
static krb5_error_code KRB5_CALLCONV
keyblock_key_proc(krb5_context context, krb5_enctype enctype,
krb5_const_pointer keyseed,
krb5_salt salt, krb5_data *s2kparms,
krb5_keyblock **key)
{
return krb5_copy_keyblock (context, keyseed, key);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_keyblock(krb5_context context,
krb5_init_creds_context ctx,
krb5_keyblock *keyblock)
{
ctx->keyseed = (void *)keyblock;
ctx->keyproc = keyblock_key_proc;
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_fast_ccache(krb5_context context,
krb5_init_creds_context ctx,
krb5_ccache fast_ccache)
{
krb5_creds *cred = NULL;
krb5_error_code ret;
krb5_data data;
ret = _krb5_get_krbtgt(context, fast_ccache, NULL, &cred);
if (ret)
return ret;
ret = krb5_cc_get_config(context, fast_ccache, cred->server,
"fast_avail", &data);
krb5_free_creds(context, cred);
if (ret == 0) {
ctx->fast_state.armor_ccache = fast_ccache;
ctx->fast_state.flags |= KRB5_FAST_REQUIRED;
ctx->fast_state.flags |= KRB5_FAST_KDC_VERIFIED;
} else {
krb5_set_error_message(context, EINVAL, N_("FAST not available for the KDC in the armor ccache", ""));
return EINVAL;
}
return 0;
}
static krb5_error_code
validate_pkinit_fx(krb5_context context,
krb5_init_creds_context ctx,
AS_REP *rep,
krb5_keyblock *ticket_sessionkey)
{
PA_DATA *pa = NULL;
int idx = 0;
if (rep->padata)
pa = krb5_find_padata(rep->padata->val, rep->padata->len, KRB5_PADATA_PKINIT_KX, &idx);
if (pa == NULL) {
if (ctx->flags.request_anonymous && ctx->pk_init_ctx) {
/* XXX handle the case where pkinit is not used */
krb5_set_error_message(context, KRB5_KDCREP_MODIFIED,
N_("Requested anonymous with PKINIT and KDC didn't set PKINIT_KX", ""));
return KRB5_KDCREP_MODIFIED;
}
return 0;
}
heim_assert(ctx->fast_state.reply_key != NULL, "must have a reply key at this stage");
return _krb5_pk_kx_confirm(context,
ctx->pk_init_ctx,
ctx->fast_state.reply_key,
ticket_sessionkey,
pa);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_fast_ap_armor_service(krb5_context context,
krb5_init_creds_context ctx,
krb5_const_principal armor_service)
{
krb5_error_code ret;
if (ctx->fast_state.armor_service)
krb5_free_principal(context, ctx->fast_state.armor_service);
if (armor_service) {
ret = krb5_copy_principal(context, armor_service, &ctx->fast_state.armor_service);
if (ret)
return ret;
} else {
ctx->fast_state.armor_service = NULL;
}
ctx->fast_state.flags |= KRB5_FAST_AP_ARMOR_SERVICE;
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_fast_anon_pkinit(krb5_context context,
krb5_init_creds_context ctx)
{
if (ctx->fast_state.armor_ccache)
return EINVAL;
ctx->fast_state.flags |= KRB5_FAST_REQUIRED;
ctx->fast_state.flags |= KRB5_FAST_ANON_PKINIT_ARMOR;
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_krb5_init_creds_set_fast_anon_pkinit_optimistic(krb5_context context,
krb5_init_creds_context ctx)
{
if (ctx->fast_state.armor_ccache)
return EINVAL;
ctx->fast_state.flags |= KRB5_FAST_REQUIRED;
ctx->fast_state.flags |= KRB5_FAST_ANON_PKINIT_ARMOR;
ctx->fast_state.flags |= KRB5_FAST_OPTIMISTIC;
return 0;
}
static size_t
available_padata_count(METHOD_DATA *md)
{
size_t i, count = 0;
for (i = 0; i < md->len; i++) {
PA_DATA *pa = &md->val[i];
if (pa->padata_type == KRB5_PADATA_FX_COOKIE ||
pa->padata_type == KRB5_PADATA_FX_ERROR)
continue;
count++;
}
return count;
}
static krb5_error_code
init_creds_step(krb5_context context,
krb5_init_creds_context ctx,
krb5_data *in,
krb5_data *out,
krb5_krbhst_info *hostinfo,
unsigned int *flags)
{
struct timeval start_time, end_time;
krb5_data checksum_data;
krb5_error_code ret;
size_t len = 0;
size_t size;
AS_REQ req2;
gettimeofday(&start_time, NULL);
krb5_data_zero(out);
krb5_data_zero(&checksum_data);
if (ctx->as_req.req_body.cname == NULL) {
ret = init_as_req(context, ctx->flags, &ctx->cred,
ctx->addrs, ctx->etypes, &ctx->as_req);
if (ret)
return ret;
if (ctx->fast_state.flags & KRB5_FAST_REQUIRED)
;
else if (ctx->fast_state.flags & KRB5_FAST_AP_ARMOR_SERVICE)
/* Check with armor service if there is FAST */;
else
ctx->fast_state.flags |= KRB5_FAST_DISABLED;
/* XXX should happen after we get back reply from KDC */
pa_configure(context, ctx, NULL);
}
#define MAX_PA_COUNTER 15
if (ctx->pa_counter > MAX_PA_COUNTER) {
krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
N_("Looping %d times while getting "
"initial credentials", ""),
ctx->pa_counter);
return KRB5_GET_IN_TKT_LOOP;
}
ctx->pa_counter++;
_krb5_debug(context, 5, "krb5_get_init_creds: loop %d", ctx->pa_counter);
/* Lets process the input packet */
if (in && in->length) {
krb5_kdc_rep rep;
memset(&rep, 0, sizeof(rep));
_krb5_debug(context, 5, "krb5_get_init_creds: processing input");
ret = decode_AS_REP(in->data, in->length, &rep.kdc_rep, &size);
if (ret == 0) {
unsigned eflags = EXTRACT_TICKET_AS_REQ | EXTRACT_TICKET_TIMESYNC;
krb5_data data;
/*
* Unwrap AS-REP
*/
ASN1_MALLOC_ENCODE(Ticket, data.data, data.length,
&rep.kdc_rep.ticket, &size, ret);
if (ret)
goto out;
heim_assert(data.length == size, "ASN.1 internal error");
ret = _krb5_fast_unwrap_kdc_rep(context, ctx->nonce, &data,
&ctx->fast_state, &rep.kdc_rep);
krb5_data_free(&data);
if (ret)
goto out;
/*
* Now check and extract the ticket
*/
if (ctx->flags.canonicalize) {
eflags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
eflags |= EXTRACT_TICKET_MATCH_REALM;
}
if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK)
eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
if (ctx->flags.request_anonymous)
eflags |= EXTRACT_TICKET_MATCH_ANON;
ret = process_pa_data_to_key(context, ctx, &ctx->cred,
&ctx->as_req, &rep.kdc_rep,
hostinfo, &ctx->fast_state.reply_key);
if (ret) {
free_AS_REP(&rep.kdc_rep);
goto out;
}
if (ctx->fast_state.strengthen_key) {
krb5_keyblock result;
_krb5_debug(context, 5, "krb5_get_init_creds: FAST strengthen_key");
ret = _krb5_fast_cf2(context,
ctx->fast_state.strengthen_key,
"strengthenkey",
ctx->fast_state.reply_key,
"replykey",
&result,
NULL);
if (ret) {
free_AS_REP(&rep.kdc_rep);
goto out;
}
ctx->runflags.allow_save_as_reply_key = 1;
krb5_free_keyblock_contents(context, ctx->fast_state.reply_key);
*ctx->fast_state.reply_key = result;
}
_krb5_debug(context, 5, "krb5_get_init_creds: extracting ticket");
ret = _krb5_extract_ticket(context,
&rep,
&ctx->cred,
ctx->fast_state.reply_key,
NULL,
KRB5_KU_AS_REP_ENC_PART,
NULL,
ctx->nonce,
eflags,
&ctx->req_buffer,
NULL,
NULL);
if (ret == 0)
ret = copy_EncKDCRepPart(&rep.enc_part, &ctx->enc_part);
if (ret == 0)
ret = validate_pkinit_fx(context, ctx, &rep.kdc_rep, &ctx->cred.session);
ctx->as_enctype = ctx->fast_state.reply_key->keytype;
if (ctx->runflags.allow_save_as_reply_key) {
ctx->as_reply_key = ctx->fast_state.reply_key;
ctx->fast_state.reply_key = NULL;
} else {
krb5_free_keyblock(context, ctx->fast_state.reply_key);
ctx->fast_state.reply_key = NULL;
}
ctx->ic_flags |= KRB5_INIT_CREDS_DONE;
*flags = 0;
free_AS_REP(&rep.kdc_rep);
free_EncASRepPart(&rep.enc_part);
gettimeofday(&end_time, NULL);
timevalsub(&end_time, &start_time);
timevaladd(&ctx->stats.run_time, &end_time);
_krb5_debug(context, 1, "krb5_get_init_creds: wc: %lld.%06ld",
(long long)ctx->stats.run_time.tv_sec,
(long)ctx->stats.run_time.tv_usec);
return ret;
} else {
/* let's try to parse it as a KRB-ERROR */
_krb5_debug(context, 5, "krb5_get_init_creds: got an KRB-ERROR from KDC");
free_KRB_ERROR(&ctx->error);
ret = krb5_rd_error(context, in, &ctx->error);
if(ret && in->length && ((char*)in->data)[0] == 4)
ret = KRB5KRB_AP_ERR_V4_REPLY;
if (ret) {
_krb5_debug(context, 5, "krb5_get_init_creds: failed to read error");
goto out;
}
/*
* Unwrap method-data, if there is any,
* fast_unwrap_error() below might replace it with a
* wrapped version if we are using FAST.
*/
free_METHOD_DATA(&ctx->md);
memset(&ctx->md, 0, sizeof(ctx->md));
if (ctx->error.e_data) {
krb5_error_code ret2;
ret2 = decode_METHOD_DATA(ctx->error.e_data->data,
ctx->error.e_data->length,
&ctx->md,
NULL);
if (ret2) {
/*
* Just ignore any error, the error will be pushed
* out from krb5_error_from_rd_error() if there
* was one.
*/
_krb5_debug(context, 5, N_("Failed to decode METHOD-DATA", ""));
}
}
/*
* Unwrap KRB-ERROR, we are always calling this so that
* FAST can tell us if your peer KDC suddenly dropped FAST
* wrapping and its really an attacker's packet (or a bug
* in the KDC).
*/
ret = _krb5_fast_unwrap_error(context, ctx->nonce, &ctx->fast_state,
&ctx->md, &ctx->error);
if (ret)
goto out;
/*
*
*/
ret = krb5_error_from_rd_error(context, &ctx->error, &ctx->cred);
/* log the failure */
if (_krb5_have_debug(context, 5)) {
const char *str = krb5_get_error_message(context, ret);
_krb5_debug(context, 5, "krb5_get_init_creds: KRB-ERROR %d/%s", ret, str);
krb5_free_error_message(context, str);
}
/*
* Handle special error codes
*/
if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED
|| ret == KRB5_KDC_ERR_MORE_PREAUTH_DATA_REQUIRED
|| ret == KRB5KDC_ERR_ETYPE_NOSUPP)
{
/*
* If no preauth was set and KDC requires it, give it one
* more try.
*
* If the KDC returned KRB5KDC_ERR_ETYPE_NOSUPP, just loop
* one more time since that might mean we are dealing with
* a Windows KDC that is confused about what enctypes are
* available.
*/
if (available_padata_count(&ctx->md) == 0) {
krb5_set_error_message(context, ret,
N_("Preauth required but no preauth "
"options send by KDC", ""));
goto out;
}
} else if (ret == KRB5KRB_AP_ERR_SKEW && context->kdc_sec_offset == 0) {
/*
* Try adapt to timeskrew when we are using pre-auth, and
* if there was a time skew, try again.
*/
krb5_set_real_time(context, ctx->error.stime, -1);
if (context->kdc_sec_offset)
ret = 0;
_krb5_debug(context, 10, "init_creds: err skew updating kdc offset to %d",
context->kdc_sec_offset);
if (ret)
goto out;
pa_restart(context, ctx);
} else if (ret == KRB5_KDC_ERR_WRONG_REALM && ctx->flags.canonicalize) {
/* client referral to a new realm */
char *ref_realm;
if (ctx->error.crealm == NULL) {
krb5_set_error_message(context, ret,
N_("Got a client referral, not but no realm", ""));
goto out;
}
ref_realm = *ctx->error.crealm;
_krb5_debug(context, 5, "krb5_get_init_creds: referral to realm %s",
ref_realm);
/*
* If its a krbtgt, lets updat the requested krbtgt too
*/
if (krb5_principal_is_krbtgt(context, ctx->cred.server)) {
free(ctx->cred.server->name.name_string.val[1]);
ctx->cred.server->name.name_string.val[1] = strdup(ref_realm);
if (ctx->cred.server->name.name_string.val[1] == NULL) {
ret = krb5_enomem(context);
goto out;
}
free_PrincipalName(ctx->as_req.req_body.sname);
ret = _krb5_principal2principalname(ctx->as_req.req_body.sname, ctx->cred.server);
if (ret)
goto out;
}
free(ctx->as_req.req_body.realm);
ret = copy_Realm(&ref_realm, &ctx->as_req.req_body.realm);
if (ret)
goto out;
ret = krb5_principal_set_realm(context,
ctx->cred.client,
*ctx->error.crealm);
if (ret)
goto out;
ret = krb5_unparse_name(context, ctx->cred.client, &ref_realm);
if (ret == 0) {
_krb5_debug(context, 5, "krb5_get_init_creds: got referral to %s", ref_realm);
krb5_xfree(ref_realm);
}
pa_restart(context, ctx);
} else if (ret == KRB5KDC_ERR_KEY_EXP && ctx->runflags.change_password == 0 &&
ctx->runflags.change_password_prompt) {
char buf2[1024];
ctx->runflags.change_password = 1;
ctx->prompter(context, ctx->prompter_data, NULL, N_("Password has expired", ""), 0, NULL);
/* try to avoid recursion */
if (ctx->in_tkt_service != NULL && strcmp(ctx->in_tkt_service, "kadmin/changepw") == 0)
goto out;
/* don't include prompter in runtime */
gettimeofday(&end_time, NULL);
timevalsub(&end_time, &start_time);
timevaladd(&ctx->stats.run_time, &end_time);
ret = change_password(context,
ctx->cred.client,
ctx->password,
buf2,
sizeof(buf2),
ctx->prompter,
ctx->prompter_data,
NULL);
if (ret)
goto out;
gettimeofday(&start_time, NULL);
krb5_init_creds_set_password(context, ctx, buf2);
pa_restart(context, ctx);
} else if (ret == KRB5KDC_ERR_PREAUTH_FAILED) {
/*
* Old MIT KDC can't handle KRB5_PADATA_REQ_ENC_PA_REP,
* so drop it and try again. But only try that for MIT
* Kerberos servers by keying of no METHOD-DATA.
*/
if (ctx->runflags.allow_enc_pa_rep) {
if (ctx->md.len != 0) {
_krb5_debug(context, 10, "Server sent PA data with KRB-ERROR, "
"so not a pre 1.7 MIT KDC and won't retry w/o ENC-PA-REQ");
goto out;
}
_krb5_debug(context, 10, "Disabling allow_enc_pa_rep and trying again");
ctx->runflags.allow_enc_pa_rep = 0;
goto retry;
}
if (ctx->fast_state.flags & KRB5_FAST_DISABLED) {
_krb5_debug(context, 10, "FAST disabled and got preauth failed");
goto out;
}
retry:
pa_restart(context, ctx);
} else if (ctx->fast_state.flags & KRB5_FAST_OPTIMISTIC) {
_krb5_debug(context, 10,
"Some other error %d failed with optimistic FAST, trying w/o FAST", ret);
ctx->fast_state.flags &= ~KRB5_FAST_OPTIMISTIC;
ctx->fast_state.flags &= ~KRB5_FAST_REQUIRED;
ctx->fast_state.flags &= ~KRB5_FAST_ANON_PKINIT_ARMOR;
ctx->fast_state.flags |= KRB5_FAST_DISABLED;
pa_restart(context, ctx);
} else {
/* some other error code from the KDC, lets' return it to the user */
goto out;
}
}
}
if (ctx->as_req.padata) {
free_METHOD_DATA(ctx->as_req.padata);
free(ctx->as_req.padata);
ctx->as_req.padata = NULL;
}
ret = _krb5_fast_create_armor(context, &ctx->fast_state,
ctx->cred.client->realm);
if (ret)
goto out;
/* Set a new nonce. */
ctx->as_req.req_body.nonce = ctx->nonce;
/*
* Step and announce PA-DATA
*/
ret = process_pa_data_to_md(context, &ctx->cred, &ctx->as_req, ctx,
&ctx->md, &ctx->as_req.padata);
if (ret)
goto out;
/*
* Wrap with FAST
*/
ret = copy_AS_REQ(&ctx->as_req, &req2);
if (ret)
goto out;
ret = _krb5_fast_wrap_req(context,
&ctx->fast_state,
NULL,
&req2);
krb5_data_free(&checksum_data);
if (ret) {
free_AS_REQ(&req2);
goto out;
}
krb5_data_free(&ctx->req_buffer);
ASN1_MALLOC_ENCODE(AS_REQ,
ctx->req_buffer.data, ctx->req_buffer.length,
&req2, &len, ret);
free_AS_REQ(&req2);
if (ret)
goto out;
if(len != ctx->req_buffer.length)
krb5_abortx(context, "internal error in ASN.1 encoder");
out->data = ctx->req_buffer.data;
out->length = ctx->req_buffer.length;
*flags = KRB5_INIT_CREDS_STEP_FLAG_CONTINUE;
gettimeofday(&end_time, NULL);
timevalsub(&end_time, &start_time);
timevaladd(&ctx->stats.run_time, &end_time);
return 0;
out:
return ret;
}
/**
* The core loop if krb5_get_init_creds() function family. Create the
* packets and have the caller send them off to the KDC.
*
* If the caller want all work been done for them, use
* krb5_init_creds_get() instead.
*
* @param context a Kerberos 5 context.
* @param ctx ctx krb5_init_creds_context context.
* @param in input data from KDC, first round it should be reset by krb5_data_zer().
* @param out reply to KDC.
* @param hostinfo KDC address info, first round it can be NULL.
* @param flags status of the round, if
* KRB5_INIT_CREDS_STEP_FLAG_CONTINUE is set, continue one more round.
*
* @return 0 for success, or an Kerberos 5 error code, see
* krb5_get_error_message().
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_step(krb5_context context,
krb5_init_creds_context ctx,
krb5_data *in,
krb5_data *out,
krb5_krbhst_info *hostinfo,
unsigned int *flags)
{
krb5_error_code ret;
krb5_data empty;
krb5_data_zero(&empty);
if ((ctx->fast_state.flags & KRB5_FAST_ANON_PKINIT_ARMOR) &&
ctx->fast_state.armor_ccache == NULL) {
ret = _krb5_fast_anon_pkinit_step(context, ctx, &ctx->fast_state,
in, out, hostinfo, flags);
if (ret && (ctx->fast_state.flags & KRB5_FAST_OPTIMISTIC)) {
_krb5_debug(context, 5, "Preauth failed with optimistic "
"FAST, trying w/o FAST");
ctx->fast_state.flags &= ~KRB5_FAST_OPTIMISTIC;
ctx->fast_state.flags &= ~KRB5_FAST_REQUIRED;
ctx->fast_state.flags &= ~KRB5_FAST_ANON_PKINIT_ARMOR;
} else if (ret ||
((*flags & KRB5_INIT_CREDS_STEP_FLAG_CONTINUE) == 0) ||
out->length)
return ret;
in = &empty;
}
return init_creds_step(context, ctx, in, out, hostinfo, flags);
}
/**
* Extract the newly acquired credentials from krb5_init_creds_context
* context.
*
* @param context A Kerberos 5 context.
* @param ctx
* @param cred credentials, free with krb5_free_cred_contents().
*
* @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_get_creds(krb5_context context,
krb5_init_creds_context ctx,
krb5_creds *cred)
{
return krb5_copy_creds_contents(context, &ctx->cred, cred);
}
/**
* Extract the as-reply key from the context.
*
* Only allowed when the as-reply-key is not directly derived from the
* password like PK-INIT, GSS, FAST hardened key, etc.
*
* @param context A Kerberos 5 context.
* @param ctx ctx krb5_init_creds_context context.
* @param as_reply_key keyblock, free with krb5_free_keyblock_contents().
*
* @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_get_as_reply_key(krb5_context context,
krb5_init_creds_context ctx,
krb5_keyblock *as_reply_key)
{
if (ctx->as_reply_key == NULL)
return KRB5KDC_ERR_PREAUTH_REQUIRED;
return krb5_copy_keyblock_contents(context, ctx->as_reply_key, as_reply_key);
}
KRB5_LIB_FUNCTION krb5_timestamp KRB5_LIB_CALL
_krb5_init_creds_get_cred_starttime(krb5_context context, krb5_init_creds_context ctx)
{
return ctx->cred.times.starttime;
}
KRB5_LIB_FUNCTION krb5_timestamp KRB5_LIB_CALL
_krb5_init_creds_get_cred_endtime(krb5_context context, krb5_init_creds_context ctx)
{
return ctx->cred.times.endtime;
}
KRB5_LIB_FUNCTION krb5_principal KRB5_LIB_CALL
_krb5_init_creds_get_cred_client(krb5_context context, krb5_init_creds_context ctx)
{
return ctx->cred.client;
}
/**
* Get the last error from the transaction.
*
* @return Returns 0 or an error code
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_get_error(krb5_context context,
krb5_init_creds_context ctx,
KRB_ERROR *error)
{
krb5_error_code ret;
ret = copy_KRB_ERROR(&ctx->error, error);
if (ret)
krb5_enomem(context);
return ret;
}
/**
* Store config
*
* @param context A Kerberos 5 context.
* @param ctx The krb5_init_creds_context to free.
* @param id store
*
* @return Returns 0 or an error code
*
* @ingroup krb5_credential
*/
krb5_error_code KRB5_LIB_FUNCTION
krb5_init_creds_store_config(krb5_context context,
krb5_init_creds_context ctx,
krb5_ccache id)
{
krb5_error_code ret;
if (ctx->kdc_hostname) {
krb5_data data;
data.length = strlen(ctx->kdc_hostname);
data.data = ctx->kdc_hostname;
ret = krb5_cc_set_config(context, id, NULL, "lkdc-hostname", &data);
if (ret)
return ret;
}
if (ctx->sitename) {
krb5_data data;
data.length = strlen(ctx->sitename);
data.data = ctx->sitename;
ret = krb5_cc_set_config(context, id, NULL, "sitename", &data);
if (ret)
return ret;
}
return 0;
}
/**
*
* @ingroup krb5_credential
*/
krb5_error_code
krb5_init_creds_store(krb5_context context,
krb5_init_creds_context ctx,
krb5_ccache id)
{
krb5_error_code ret;
if (ctx->cred.client == NULL) {
ret = KRB5KDC_ERR_PREAUTH_REQUIRED;
krb5_set_error_message(context, ret, "init creds not completed yet");
return ret;
}
ret = krb5_cc_initialize(context, id, ctx->cred.client);
if (ret)
return ret;
ret = krb5_cc_store_cred(context, id, &ctx->cred);
if (ret)
return ret;
if (ctx->cred.flags.b.enc_pa_rep) {
krb5_data data = { 3, rk_UNCONST("yes") };
ret = krb5_cc_set_config(context, id, ctx->cred.server,
"fast_avail", &data);
if (ret)
return ret;
}
return 0;
}
/**
* Free the krb5_init_creds_context allocated by krb5_init_creds_init().
*
* @param context A Kerberos 5 context.
* @param ctx The krb5_init_creds_context to free.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_init_creds_free(krb5_context context,
krb5_init_creds_context ctx)
{
free_init_creds_ctx(context, ctx);
free(ctx);
}
/**
* Get new credentials as setup by the krb5_init_creds_context.
*
* @param context A Kerberos 5 context.
* @param ctx The krb5_init_creds_context to process.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx)
{
krb5_sendto_ctx stctx = NULL;
krb5_krbhst_info *hostinfo = NULL;
krb5_error_code ret;
krb5_data in, out;
unsigned int flags = 0;
krb5_data_zero(&in);
krb5_data_zero(&out);
ret = krb5_sendto_ctx_alloc(context, &stctx);
if (ret)
goto out;
krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
if (ctx->kdc_hostname)
krb5_sendto_set_hostname(context, stctx, ctx->kdc_hostname);
if (ctx->sitename)
krb5_sendto_set_sitename(context, stctx, ctx->sitename);
while (1) {
struct timeval nstart, nend;
flags = 0;
ret = krb5_init_creds_step(context, ctx, &in, &out, hostinfo, &flags);
krb5_data_free(&in);
if (ret)
goto out;
if ((flags & KRB5_INIT_CREDS_STEP_FLAG_CONTINUE) == 0)
break;
gettimeofday(&nstart, NULL);
ret = krb5_sendto_context (context, stctx, &out,
ctx->cred.client->realm, &in);
if (ret)
goto out;
gettimeofday(&nend, NULL);
timevalsub(&nend, &nstart);
timevaladd(&ctx->stats.run_time, &nend);
}
out:
if (stctx)
krb5_sendto_ctx_free(context, stctx);
return ret;
}
/**
* Get new credentials using password.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_init_creds_password(krb5_context context,
krb5_creds *creds,
krb5_principal client,
const char *password,
krb5_prompter_fct prompter,
void *data,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_init_creds_context ctx;
char buf[BUFSIZ], buf2[BUFSIZ];
krb5_error_code ret;
int chpw = 0;
again:
ret = krb5_init_creds_init(context, client, prompter, data, start_time, options, &ctx);
if (ret)
goto out;
ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
if (ret)
goto out;
if (prompter != NULL && ctx->password == NULL && password == NULL) {
krb5_prompt prompt;
krb5_data password_data;
char *p, *q = NULL;
int aret;
ret = krb5_unparse_name(context, client, &p);
if (ret)
goto out;
aret = asprintf(&q, "%s's Password: ", p);
free (p);
if (aret == -1 || q == NULL) {
ret = krb5_enomem(context);
goto out;
}
prompt.prompt = q;
password_data.data = buf;
password_data.length = sizeof(buf);
prompt.hidden = 1;
prompt.reply = &password_data;
prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
ret = (*prompter) (context, data, NULL, NULL, 1, &prompt);
free (q);
if (ret) {
memset_s(buf, sizeof(buf), 0, sizeof(buf));
ret = KRB5_LIBOS_PWDINTR;
krb5_clear_error_message (context);
goto out;
}
password = password_data.data;
}
if (password) {
ret = krb5_init_creds_set_password(context, ctx, password);
if (ret)
goto out;
}
ret = krb5_init_creds_get(context, ctx);
if (ret == 0)
krb5_process_last_request(context, options, ctx);
if (ret == KRB5KDC_ERR_KEY_EXPIRED && chpw == 0) {
/* try to avoid recursion */
if (in_tkt_service != NULL && strcmp(in_tkt_service, "kadmin/changepw") == 0)
goto out;
/* don't try to change password if no prompter or prompting disabled */
if (!ctx->runflags.change_password_prompt)
goto out;
ret = change_password (context,
client,
ctx->password,
buf2,
sizeof(buf2),
prompter,
data,
options);
if (ret)
goto out;
password = buf2;
chpw = 1;
krb5_init_creds_free(context, ctx);
goto again;
}
out:
if (ret == 0)
krb5_init_creds_get_creds(context, ctx, creds);
if (ctx)
krb5_init_creds_free(context, ctx);
memset_s(buf, sizeof(buf), 0, sizeof(buf));
memset_s(buf2, sizeof(buf), 0, sizeof(buf2));
return ret;
}
/**
* Get new credentials using keyblock.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_init_creds_keyblock(krb5_context context,
krb5_creds *creds,
krb5_principal client,
krb5_keyblock *keyblock,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_init_creds_context ctx;
krb5_error_code ret;
memset(creds, 0, sizeof(*creds));
ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
if (ret)
goto out;
ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
if (ret)
goto out;
ret = krb5_init_creds_set_keyblock(context, ctx, keyblock);
if (ret)
goto out;
ret = krb5_init_creds_get(context, ctx);
if (ret == 0)
krb5_process_last_request(context, options, ctx);
out:
if (ret == 0)
krb5_init_creds_get_creds(context, ctx, creds);
if (ctx)
krb5_init_creds_free(context, ctx);
return ret;
}
/**
* Get new credentials using keytab.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_init_creds_keytab(krb5_context context,
krb5_creds *creds,
krb5_principal client,
krb5_keytab keytab,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_init_creds_context ctx;
krb5_keytab_entry ktent;
krb5_error_code ret;
memset(&ktent, 0, sizeof(ktent));
memset(creds, 0, sizeof(*creds));
if (strcmp(client->realm, "") == 0) {
/*
* Referral realm. We have a keytab, so pick a realm by
* matching in the keytab.
*/
ret = krb5_kt_get_entry(context, keytab, client, 0, 0, &ktent);
if (ret == 0)
client = ktent.principal;
}
ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
if (ret)
goto out;
ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
if (ret)
goto out;
ret = krb5_init_creds_set_keytab(context, ctx, keytab);
if (ret)
goto out;
ret = krb5_init_creds_get(context, ctx);
if (ret == 0)
krb5_process_last_request(context, options, ctx);
out:
krb5_kt_free_entry(context, &ktent);
if (ret == 0)
krb5_init_creds_get_creds(context, ctx, creds);
if (ctx)
krb5_init_creds_free(context, ctx);
return ret;
}
KRB5_LIB_FUNCTION void KRB5_LIB_CALL
_krb5_init_creds_set_gss_mechanism(krb5_context context,
krb5_gss_init_ctx gssic,
const struct gss_OID_desc_struct *gss_mech)
{
gssic->mech = gss_mech; /* OIDs are interned, so no copy required */
}
KRB5_LIB_FUNCTION const struct gss_OID_desc_struct * KRB5_LIB_CALL
_krb5_init_creds_get_gss_mechanism(krb5_context context,
krb5_gss_init_ctx gssic)
{
return gssic->mech;
}
KRB5_LIB_FUNCTION void KRB5_LIB_CALL
_krb5_init_creds_set_gss_cred(krb5_context context,
krb5_gss_init_ctx gssic,
struct gss_cred_id_t_desc_struct *gss_cred)
{
if (gssic->cred != gss_cred && gssic->flags.release_cred)
gssic->release_cred(context, gssic, gssic->cred);
gssic->cred = gss_cred;
gssic->flags.release_cred = 1;
}
KRB5_LIB_FUNCTION const struct gss_cred_id_t_desc_struct * KRB5_LIB_CALL
_krb5_init_creds_get_gss_cred(krb5_context context,
krb5_gss_init_ctx gssic)
{
return gssic->cred;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_krb5_init_creds_init_gss(krb5_context context,
krb5_init_creds_context ctx,
krb5_gssic_step step,
krb5_gssic_finish finish,
krb5_gssic_release_cred release_cred,
krb5_gssic_delete_sec_context delete_sec_context,
const struct gss_cred_id_t_desc_struct *gss_cred,
const struct gss_OID_desc_struct *gss_mech,
unsigned int flags)
{
krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
gssic = calloc(1, sizeof(*gssic));
if (gssic == NULL)
return krb5_enomem(context);
if (ctx->gss_init_ctx)
free_gss_init_ctx(context, ctx->gss_init_ctx);
ctx->gss_init_ctx = gssic;
gssic->cred = (struct gss_cred_id_t_desc_struct *)gss_cred;
gssic->mech = gss_mech;
if (flags & KRB5_GSS_IC_FLAG_RELEASE_CRED)
gssic->flags.release_cred = 1;
gssic->step = step;
gssic->finish = finish;
gssic->release_cred = release_cred;
gssic->delete_sec_context = delete_sec_context;
return 0;
}
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