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7c785284bdc99155ebfb2fb192fcfb05bbcaef14
heimdal/lib/krb5/init_creds_pw.c
Love Hörnquist Åstrand d78bed5eaa Save the request buffer so that pre-auth mechanism that needs it can 
verify the reply.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15933 ec53bebd-3082-4978-b11e-865c3cabbd6b
2005-08-13 08:25:32 +00:00

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37 KiB
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/*
* Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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"
RCSID("$Id$");
typedef struct krb5_get_init_creds_ctx {
krb5_kdc_flags flags;
krb5_creds cred;
krb5_addresses *addrs;
krb5_enctype *etypes;
krb5_preauthtype *pre_auth_types;
const char *in_tkt_service;
unsigned nonce;
unsigned pk_nonce;
krb5_data req_buffer;
AS_REQ as_req;
int pa_counter;
const char *password;
krb5_s2k_proc key_proc;
krb5_get_init_creds_req_pac req_pac;
krb5_pk_init_ctx pk_init_ctx;
} krb5_get_init_creds_ctx;
static krb5_error_code
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;
password.data = rk_UNCONST(keyseed);
password.length = strlen(keyseed);
if (s2kparms)
opaque = *s2kparms;
else
krb5_data_zero(&opaque);
*key = malloc(sizeof(**key));
if (*key == NULL)
return ENOMEM;
ret = krb5_string_to_key_data_salt_opaque(context, type, password,
salt, opaque, *key);
if (ret)
free(*key);
return ret;
}
static void
free_init_creds_ctx(krb5_context context, krb5_get_init_creds_ctx *ctx)
{
if (ctx->etypes)
free(ctx->etypes);
if (ctx->pre_auth_types)
free (ctx->pre_auth_types);
free_AS_REQ(&ctx->as_req);
memset(&ctx->as_req, 0, sizeof(ctx->as_req));
}
static int
get_config_time (krb5_context context,
const char *realm,
const char *name,
int def)
{
int 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,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_error_code ret;
krb5_const_realm client_realm;
int tmp;
krb5_timestamp now;
krb5_timeofday (context, &now);
memset (cred, 0, sizeof(*cred));
if (client)
krb5_copy_principal(context, client, &cred->client);
else {
ret = krb5_get_default_principal (context,
&cred->client);
if (ret)
goto out;
}
client_realm = krb5_principal_get_realm (context, cred->client);
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 = 10 * 60 * 60;
cred->times.endtime = now + tmp;
if ((options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE) &&
options->renew_life > 0) {
cred->times.renew_till = now + options->renew_life;
}
if (in_tkt_service) {
krb5_realm server_realm;
ret = krb5_parse_name (context, in_tkt_service, &cred->server);
if (ret)
goto out;
server_realm = strdup (client_realm);
free (*krb5_princ_realm(context, cred->server));
krb5_princ_set_realm (context, cred->server, &server_realm);
} else {
ret = krb5_make_principal(context, &cred->server,
client_realm, KRB5_TGS_NAME, client_realm,
NULL);
if (ret)
goto out;
}
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;
asprintf (&p, "%s%s", str, ctime(&now));
(*prompter) (context, data, NULL, p, 0, NULL);
free (p);
}
/*
* Parse the last_req data and show it to the user if it's interesting
*/
static void
print_expire (krb5_context context,
krb5_const_realm realm,
krb5_kdc_rep *rep,
krb5_prompter_fct prompter,
krb5_data *data)
{
int i;
LastReq *lr = &rep->enc_part.last_req;
krb5_timestamp sec;
time_t t;
krb5_boolean reported = FALSE;
krb5_timeofday (context, &sec);
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 (abs(lr->val[i].lr_type)) {
case LR_PW_EXPTIME :
report_expiration(context, prompter, data,
"Your password will expire at ",
lr->val[i].lr_value);
reported = TRUE;
break;
case LR_ACCT_EXPTIME :
report_expiration(context, prompter, data,
"Your account will expire at ",
lr->val[i].lr_value);
reported = TRUE;
break;
}
}
}
if (!reported
&& rep->enc_part.key_expiration
&& *rep->enc_part.key_expiration <= t) {
report_expiration(context, prompter, data,
"Your password/account will expire at ",
*rep->enc_part.key_expiration);
}
}
static krb5_error_code
get_init_creds_common(krb5_context context,
krb5_creds *creds,
krb5_principal client,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options,
krb5_get_init_creds_ctx *ctx)
{
krb5_get_init_creds_opt default_opt;
krb5_error_code ret;
krb5_enctype *etypes;
krb5_preauthtype *pre_auth_types;
memset(ctx, 0, sizeof(*ctx));
if (options == NULL) {
krb5_get_init_creds_opt_init (&default_opt);
options = &default_opt;
}
if (options->private) {
ctx->password = options->private->password;
ctx->key_proc = options->private->key_proc;
ctx->req_pac = options->private->req_pac;
ctx->pk_init_ctx = options->private->pk_init_ctx;
} else
ctx->req_pac = KRB5_PA_PAC_DONT_CARE;
if (ctx->key_proc == NULL)
ctx->key_proc = default_s2k_func;
ctx->pre_auth_types = NULL;
ctx->flags.i = 0;
ctx->addrs = NULL;
ctx->etypes = NULL;
ctx->pre_auth_types = NULL;
ctx->in_tkt_service = in_tkt_service;
ret = init_cred (context, &ctx->cred, client, start_time,
in_tkt_service, options);
if (ret)
return ret;
ctx->flags.i = 0;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)
ctx->flags.b.forwardable = options->forwardable;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)
ctx->flags.b.proxiable = options->proxiable;
if (start_time)
ctx->flags.b.postdated = 1;
if (ctx->cred.times.renew_till)
ctx->flags.b.renewable = 1;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST)
ctx->addrs = options->address_list;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST) {
etypes = malloc((options->etype_list_length + 1)
* sizeof(krb5_enctype));
if (etypes == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
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) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
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_SALT)
; /* XXX */
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS)
ctx->flags.b.request_anonymous = options->anonymous;
return 0;
}
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;
memset (&cpw_cred, 0, sizeof(cpw_cred));
krb5_get_init_creds_opt_init (&options);
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);
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);
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_change_password (context,
&cpw_cred,
buf1,
&result_code,
&result_code_string,
&result_string);
if (ret)
goto out;
asprintf (&p, "%s: %.*s\n",
result_code ? "Error" : "Success",
(int)result_string.length,
result_string.length > 0 ? (char*)result_string.data : "");
ret = (*prompter) (context, data, NULL, p, 0, NULL);
free (p);
if (result_code == 0) {
strlcpy (newpw, buf1, newpw_sz);
ret = 0;
} else {
krb5_set_error_string (context, "failed changing password");
ret = ENOTTY;
}
out:
memset (buf1, 0, sizeof(buf1));
memset (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_error_code KRB5_LIB_FUNCTION
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);
}
krb5_error_code KRB5_LIB_FUNCTION
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_get_init_creds_ctx ctx;
krb5_error_code ret;
krb5_keytab_key_proc_args *a;
ret = get_init_creds_common(context, creds, client, start_time,
in_tkt_service, options, &ctx);
if (ret)
goto out;
a = malloc (sizeof(*a));
if (a == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
ret = ENOMEM;
goto out;
}
a->principal = ctx.cred.client;
a->keytab = keytab;
ret = krb5_get_in_cred (context,
ctx.flags.i,
ctx.addrs,
ctx.etypes,
ctx.pre_auth_types,
NULL,
krb5_keytab_key_proc,
a,
NULL,
NULL,
&ctx.cred,
NULL);
free (a);
if (ret == 0 && creds)
*creds = ctx.cred;
else
krb5_free_cred_contents (context, &ctx.cred);
out:
free_init_creds_ctx(context, &ctx);
return ret;
}
/*
*
*/
static krb5_error_code
init_creds_init_as_req (krb5_context context,
krb5_kdc_flags 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.b;
a->req_body.cname = malloc(sizeof(*a->req_body.cname));
if (a->req_body.cname == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
a->req_body.sname = malloc(sizeof(*a->req_body.sname));
if (a->req_body.sname == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
if (creds->client) {
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;
} else {
krb5_realm realm;
a->req_body.cname = NULL;
ret = krb5_get_default_realm(context, &realm);
if (ret)
goto fail;
ret = copy_Realm(&realm, &a->req_body.realm);
free(realm);
}
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 = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
*a->req_body.from = creds->times.starttime;
}
if(creds->times.endtime){
ALLOC(a->req_body.till, 1);
*a->req_body.till = creds->times.endtime;
}
if(creds->times.renew_till){
a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
if (a->req_body.rtime == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
*a->req_body.rtime = creds->times.renew_till;
}
a->req_body.nonce = 0;
ret = krb5_init_etype (context,
&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 = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
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(a, 0, sizeof(*a));
return ret;
}
struct pa_info_data {
krb5_enctype etype;
krb5_salt salt;
krb5_data *s2kparams;
};
static void
free_paid(krb5_context context, struct pa_info_data *ppaid)
{
krb5_free_salt(context, ppaid->salt);
if (ppaid->s2kparams)
krb5_data_free(ppaid->s2kparams);
}
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_string(context);
return ENOMEM;
}
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_string(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;
int 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 (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;
int 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 (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 == ENCTYPE_NULL)
return NULL;
ret = set_paid(paid, context,
paid->etype,
paid->salt.salttype,
data->data,
data->length,
NULL);
if (ret)
return NULL;
return paid;
}
struct pa_info {
krb5_preauthtype type;
struct pa_info_data *(*salt_info)(krb5_context,
const krb5_principal,
const AS_REQ *,
struct pa_info_data *,
heim_octet_string *);
};
static struct pa_info pa_prefs[] = {
{ KRB5_PADATA_ETYPE_INFO2, pa_etype_info2 },
{ KRB5_PADATA_ETYPE_INFO, pa_etype_info },
{ KRB5_PADATA_PW_SALT, pa_pw_or_afs3_salt },
{ KRB5_PADATA_AFS3_SALT, pa_pw_or_afs3_salt }
};
static PA_DATA *
find_pa_data(const METHOD_DATA *md, int type)
{
int i;
for (i = 0; i < md->len; i++)
if (md->val[i].padata_type == type)
return &md->val[i];
return NULL;
}
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;
int i;
for (i = 0; p == NULL && i < sizeof(pa_prefs)/sizeof(pa_prefs[0]); i++) {
PA_DATA *pa = find_pa_data(md, pa_prefs[i].type);
if (pa == NULL)
continue;
paid->salt.salttype = pa_prefs[i].type;
p = (*pa_prefs[i].salt_info)(context, client, asreq,
paid, &pa->padata_value);
}
return p;
}
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;
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 key_proc,
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;
int i;
if(salt == NULL) {
/* default to standard salt */
ret = krb5_get_pw_salt (context, client, &salt2);
salt = &salt2;
}
if (!enctypes) {
enctypes = context->etypes;
netypes = 0;
for (ep = enctypes; *ep != ETYPE_NULL; ep++)
netypes++;
}
for (i = 0; i < netypes; ++i) {
krb5_keyblock *key;
ret = (*key_proc)(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_get_init_creds_ctx *ctx,
struct pa_info_data *ppaid,
METHOD_DATA *md)
{
if (ctx->key_proc == NULL || ctx->password == NULL)
return 0;
if (ppaid) {
add_enc_ts_padata(context, md, client,
ctx->key_proc, ctx->password,
&ppaid->etype, 1,
&ppaid->salt, ppaid->s2kparams);
} else {
krb5_salt salt;
/* make a v5 salted pa-data */
add_enc_ts_padata(context, md, client,
ctx->key_proc, ctx->password,
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->key_proc, ctx->password,
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_get_init_creds_ctx *ctx,
krb5_salt salt,
krb5_data *s2kparams,
krb5_enctype etype,
krb5_keyblock **key)
{
krb5_error_code ret;
ret = (*ctx->key_proc)(context, etype, ctx->password,
salt, s2kparams, key);
return ret;
}
static krb5_error_code
pa_data_to_md_pkinit(krb5_context context,
const AS_REQ *a,
const krb5_principal client,
krb5_get_init_creds_ctx *ctx,
METHOD_DATA *md)
{
if (ctx->pk_init_ctx == NULL)
return 0;
#ifdef PKINIT
return _krb5_pk_mk_padata(context,
ctx->pk_init_ctx,
&a->req_body,
ctx->pk_nonce,
md);
#else
krb5_set_error_string(context, "no support for PKINIT compiled in");
return EINVAL;
#endif
}
static krb5_error_code
pa_data_add_pac_request(krb5_context context,
krb5_get_init_creds_ctx *ctx,
METHOD_DATA *md)
{
size_t len, length;
krb5_error_code ret;
PA_PAC_REQUEST req;
void *buf;
switch (ctx->req_pac) {
case KRB5_PA_PAC_DONT_CARE:
return 0; /* don't bother */
case KRB5_PA_PAC_REQ_TRUE:
req.include_pac = 1;
break;
case KRB5_PA_PAC_REQ_FALSE:
req.include_pac = 0;
}
ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length,
&req, &len, ret);
if (ret)
return ret;
if(len != length)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_padata_add(context, md, KRB5_PADATA_PA_PAC_REQUEST, buf, len);
if (ret)
free(buf);
return 0;
}
/*
* 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_get_init_creds_ctx *ctx,
METHOD_DATA *in_md,
METHOD_DATA **out_md,
krb5_prompter_fct prompter,
void *prompter_data)
{
krb5_error_code ret;
ALLOC(*out_md, 1);
if (*out_md == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
(*out_md)->len = 0;
(*out_md)->val = NULL;
if (in_md->len != 0) {
struct pa_info_data paid, *ppaid;
memset(&paid, 0, sizeof(paid));
paid.etype = ENCTYPE_NULL;
ppaid = process_pa_info(context, creds->client, a, &paid, in_md);
pa_data_to_md_ts_enc(context, a, creds->client, ctx, ppaid, *out_md);
if (ppaid)
free_paid(context, ppaid);
}
pa_data_add_pac_request(context, ctx, *out_md);
ret = pa_data_to_md_pkinit(context, a, creds->client, ctx, *out_md);
if (ret)
return ret;
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_get_init_creds_ctx *ctx,
krb5_creds *creds,
AS_REQ *a,
krb5_kdc_rep *rep,
krb5_keyblock **key)
{
struct pa_info_data paid, *ppaid = NULL;
krb5_error_code ret;
krb5_enctype etype;
PA_DATA *pa;
memset(&paid, 0, sizeof(paid));
etype = rep->kdc_rep.enc_part.etype;
if (rep->kdc_rep.padata) {
paid.etype = etype;
ppaid = process_pa_info(context, creds->client, a, &paid,
rep->kdc_rep.padata);
}
if (ppaid == NULL) {
ret = krb5_get_pw_salt (context, creds->client, &paid.salt);
if (ret)
return ret;
paid.etype = etype;
paid.s2kparams = NULL;
}
pa = NULL;
if (rep->kdc_rep.padata) {
int idx = 0;
pa = krb5_find_padata(rep->kdc_rep.padata->val,
rep->kdc_rep.padata->len,
KRB5_PADATA_PK_AS_REP,
&idx);
if (pa == NULL) {
idx = 0;
pa = krb5_find_padata(rep->kdc_rep.padata->val,
rep->kdc_rep.padata->len,
KRB5_PADATA_PK_AS_REP_19,
&idx);
}
}
if (pa && ctx->pk_init_ctx) {
#ifdef PKINIT
ret = _krb5_pk_rd_pa_reply(context,
ctx->pk_init_ctx,
etype,
ctx->pk_nonce,
&ctx->req_buffer,
pa,
key);
#else
krb5_set_error_string(context, "no support for PKINIT compiled in");
ret = EINVAL;
#endif
} else if (ctx->password)
ret = pa_data_to_key_plain(context, creds->client, ctx,
paid.salt, paid.s2kparams, etype, key);
else {
krb5_set_error_string(context, "No usable pa data type");
ret = EINVAL;
}
free_paid(context, &paid);
return ret;
}
static krb5_error_code
init_cred_loop(krb5_context context,
const krb5_get_init_creds_opt *init_cred_opts,
const krb5_prompter_fct prompter,
void *prompter_data,
krb5_get_init_creds_ctx *ctx,
krb5_creds *creds,
krb5_kdc_rep *ret_as_reply)
{
krb5_error_code ret;
krb5_kdc_rep rep;
METHOD_DATA md;
krb5_data resp;
size_t len;
size_t size;
int send_to_kdc_flags = 0;
memset(&md, 0, sizeof(md));
memset(&rep, 0, sizeof(rep));
if (ret_as_reply)
memset(ret_as_reply, 0, sizeof(*ret_as_reply));
ret = init_creds_init_as_req(context, ctx->flags, creds,
ctx->addrs, ctx->etypes, &ctx->as_req);
if (ret)
return ret;
/* Set a new nonce. */
krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce));
ctx->nonce &= 0xffffffff;
/* XXX these just needs to be the same when using Windows PK-INIT */
ctx->pk_nonce = ctx->nonce;
/*
* Increase counter when we want other pre-auth types then
* KRB5_PA_ENC_TIMESTAMP.
*/
#define MAX_PA_COUNTER 3
ctx->pa_counter = 0;
while (ctx->pa_counter < MAX_PA_COUNTER) {
ctx->pa_counter++;
if (ctx->as_req.padata) {
free_METHOD_DATA(ctx->as_req.padata);
free(ctx->as_req.padata);
ctx->as_req.padata = NULL;
}
/* Set a new nonce. */
ctx->as_req.req_body.nonce = ctx->nonce;
/* fill_in_md_data */
ret = process_pa_data_to_md(context, creds, &ctx->as_req, ctx,
&md, &ctx->as_req.padata,
prompter, prompter_data);
if (ret)
goto out;
krb5_data_free(&ctx->req_buffer);
ASN1_MALLOC_ENCODE(AS_REQ,
ctx->req_buffer.data, ctx->req_buffer.length,
&ctx->as_req, &len, ret);
if (ret)
goto out;
if(len != ctx->req_buffer.length)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_sendto_kdc_flags (context, &ctx->req_buffer,
&creds->client->realm, &resp,
send_to_kdc_flags);
if (ret)
goto out;
memset (&rep, 0, sizeof(rep));
ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
if (ret == 0) {
krb5_data_free(&resp);
krb5_clear_error_string(context);
break;
} else {
/* let's try to parse it as a KRB-ERROR */
KRB_ERROR error;
ret = krb5_rd_error(context, &resp, &error);
if(ret && resp.data && ((char*)resp.data)[0] == 4)
ret = KRB5KRB_AP_ERR_V4_REPLY;
krb5_data_free(&resp);
if (ret)
goto out;
ret = krb5_error_from_rd_error(context, &error, creds);
/*
* If no preauth was set and KDC requires it, give it one
* more try.
*/
if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED) {
free_METHOD_DATA(&md);
memset(&md, 0, sizeof(md));
if (error.e_data) {
ret = decode_METHOD_DATA(error.e_data->data,
error.e_data->length,
&md,
NULL);
if (ret)
krb5_set_error_string(context,
"failed to decode METHOD DATA");
} else {
/* XXX guess what the server want here add add md */
}
krb5_free_error_contents(context, &error);
if (ret)
goto out;
} else if (ret == KRB5KRB_ERR_RESPONSE_TOO_BIG) {
if (send_to_kdc_flags & KRB5_KRBHST_FLAGS_LARGE_MSG) {
if (ret_as_reply)
rep.error = error;
else
krb5_free_error_contents(context, &error);
goto out;
}
krb5_free_error_contents(context, &error);
send_to_kdc_flags |= KRB5_KRBHST_FLAGS_LARGE_MSG;
} else {
if (ret_as_reply)
rep.error = error;
else
krb5_free_error_contents(context, &error);
goto out;
}
}
}
{
krb5_keyblock *key = NULL;
ret = process_pa_data_to_key(context, ctx, creds,
&ctx->as_req, &rep, &key);
if (ret)
goto out;
ret = _krb5_extract_ticket(context,
&rep,
creds,
key,
NULL,
KRB5_KU_AS_REP_ENC_PART,
NULL,
ctx->nonce,
FALSE,
ctx->flags.b.request_anonymous,
NULL,
NULL);
krb5_free_keyblock(context, key);
}
out:
krb5_data_free(&ctx->req_buffer);
free_METHOD_DATA(&md);
memset(&md, 0, sizeof(md));
if (ret == 0 && ret_as_reply)
*ret_as_reply = rep;
else
krb5_free_kdc_rep (context, &rep);
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_init_creds(krb5_context context,
krb5_creds *creds,
krb5_principal client,
krb5_prompter_fct prompter,
void *data,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_get_init_creds_ctx ctx;
krb5_kdc_rep kdc_reply;
krb5_error_code ret;
char buf[BUFSIZ];
int done;
memset(&kdc_reply, 0, sizeof(kdc_reply));
ret = get_init_creds_common(context, creds, client, start_time,
in_tkt_service, options, &ctx);
if (ret)
goto out;
done = 0;
while(!done) {
memset(&kdc_reply, 0, sizeof(kdc_reply));
ret = init_cred_loop(context,
options,
prompter,
data,
&ctx,
&ctx.cred,
&kdc_reply);
switch (ret) {
case 0 :
done = 1;
break;
case KRB5KDC_ERR_KEY_EXPIRED :
/* try to avoid recursion */
/* don't try to change password where then where none */
if (prompter == NULL || ctx.password == NULL)
goto out;
krb5_clear_error_string (context);
if (ctx.in_tkt_service != NULL
&& strcmp (ctx.in_tkt_service, "kadmin/changepw") == 0)
goto out;
ret = change_password (context,
client,
ctx.password,
buf,
sizeof(buf),
prompter,
data,
options);
if (ret)
goto out;
ctx.password = buf;
break;
default:
goto out;
}
}
if (prompter)
print_expire (context,
krb5_principal_get_realm (context, ctx.cred.client),
&kdc_reply,
prompter,
data);
out:
memset (buf, 0, sizeof(buf));
free_init_creds_ctx(context, &ctx);
krb5_free_kdc_rep (context, &kdc_reply);
if (ret == 0)
*creds = ctx.cred;
else
krb5_free_cred_contents (context, &ctx.cred);
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
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 *in_options)
{
krb5_get_init_creds_opt *options;
char buf[BUFSIZ];
krb5_error_code ret;
if (in_options == NULL)
ret = krb5_get_init_creds_opt_alloc(context, &options);
else
ret = _krb5_get_init_creds_opt_copy(context, in_options, &options);
if (ret)
return ret;
if (password == NULL &&
options->private->password == NULL &&
options->private->pk_init_ctx == NULL)
{
krb5_prompt prompt;
krb5_data password_data;
char *p, *q;
krb5_unparse_name (context, client, &p);
asprintf (&q, "%s's Password: ", p);
free (p);
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 (buf, 0, sizeof(buf));
krb5_get_init_creds_opt_free(options);
ret = KRB5_LIBOS_PWDINTR;
krb5_clear_error_string (context);
return ret;
}
password = password_data.data;
}
if (options->private->password == NULL) {
ret = krb5_get_init_creds_opt_set_pa_password(context, options,
password, NULL);
if (ret) {
krb5_get_init_creds_opt_free(options);
memset(buf, 0, sizeof(buf));
return ret;
}
}
ret = krb5_get_init_creds(context, creds, client, prompter,
data, start_time, in_tkt_service, options);
krb5_get_init_creds_opt_free(options);
memset(buf, 0, sizeof(buf));
return ret;
}
static krb5_error_code
init_creds_keyblock_key_proc (krb5_context context,
krb5_enctype type,
krb5_salt salt,
krb5_const_pointer keyseed,
krb5_keyblock **key)
{
return krb5_copy_keyblock (context, keyseed, key);
}
krb5_error_code KRB5_LIB_FUNCTION
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)
{
struct krb5_get_init_creds_ctx ctx;
krb5_error_code ret;
ret = get_init_creds_common(context, creds, client, start_time,
in_tkt_service, options, &ctx);
if (ret)
goto out;
ret = krb5_get_in_cred (context,
ctx.flags.i,
ctx.addrs,
ctx.etypes,
ctx.pre_auth_types,
NULL,
init_creds_keyblock_key_proc,
keyblock,
NULL,
NULL,
&ctx.cred,
NULL);
if (ret == 0 && creds)
*creds = ctx.cred;
else
krb5_free_cred_contents (context, &ctx.cred);
out:
free_init_creds_ctx(context, &ctx);
return ret;
}
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