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bbaae5f43c3743a91cc3cd9833b2126c6e5493ef
heimdal/kuser/kinit.c
Nicolas Williams bbaae5f43c Fix 32-bit time_t regression (#220)
2016-12-06 22:44:23 -06:00

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/*
* Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple Inc. 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 "kuser_locl.h"
#ifdef __APPLE__
#include <Security/Security.h>
#endif
#ifndef NO_NTLM
#include "heimntlm.h"
#endif
#ifndef SIGINFO
#define SIGINFO SIGUSR1
#endif
int forwardable_flag = -1;
int proxiable_flag = -1;
int renewable_flag = -1;
int renew_flag = 0;
int pac_flag = -1;
int validate_flag = 0;
int version_flag = 0;
int help_flag = 0;
int addrs_flag = -1;
struct getarg_strings extra_addresses;
int anonymous_flag = 0;
char *lifetime = NULL;
char *renew_life = NULL;
char *server_str = NULL;
char *cred_cache = NULL;
char *start_str = NULL;
static int switch_cache_flags = 1;
struct getarg_strings etype_str;
int use_keytab = 0;
char *keytab_str = NULL;
static krb5_keytab kt = NULL;
int do_afslog = -1;
int fcache_version;
char *password_file = NULL;
char *pk_user_id = NULL;
int pk_enterprise_flag = 0;
struct hx509_certs_data *ent_user_id = NULL;
char *pk_x509_anchors = NULL;
int pk_use_enckey = 0;
static int canonicalize_flag = 0;
static int enterprise_flag = 0;
static int ok_as_delegate_flag = 0;
static char *fast_armor_cache_string = NULL;
static int use_referrals_flag = 0;
static int windows_flag = 0;
#ifndef NO_NTLM
static char *ntlm_domain;
#endif
static struct getargs args[] = {
/*
* used by MIT
* a: ~A
* V: verbose
* F: ~f
* P: ~p
* C: v4 cache name?
* 5:
*
* old flags
* 4:
* 9:
*/
{ "afslog", 0 , arg_flag, &do_afslog,
NP_("obtain afs tokens", ""), NULL },
{ "cache", 'c', arg_string, &cred_cache,
NP_("credentials cache", ""), "cachename" },
{ "forwardable", 'F', arg_negative_flag, &forwardable_flag,
NP_("get tickets not forwardable", ""), NULL },
{ NULL, 'f', arg_flag, &forwardable_flag,
NP_("get forwardable tickets", ""), NULL },
{ "keytab", 't', arg_string, &keytab_str,
NP_("keytab to use", ""), "keytabname" },
{ "lifetime", 'l', arg_string, &lifetime,
NP_("lifetime of tickets", ""), "time" },
{ "proxiable", 'p', arg_flag, &proxiable_flag,
NP_("get proxiable tickets", ""), NULL },
{ "renew", 'R', arg_flag, &renew_flag,
NP_("renew TGT", ""), NULL },
{ "renewable", 0, arg_flag, &renewable_flag,
NP_("get renewable tickets", ""), NULL },
{ "renewable-life", 'r', arg_string, &renew_life,
NP_("renewable lifetime of tickets", ""), "time" },
{ "server", 'S', arg_string, &server_str,
NP_("server to get ticket for", ""), "principal" },
{ "start-time", 's', arg_string, &start_str,
NP_("when ticket gets valid", ""), "time" },
{ "use-keytab", 'k', arg_flag, &use_keytab,
NP_("get key from keytab", ""), NULL },
{ "validate", 'v', arg_flag, &validate_flag,
NP_("validate TGT", ""), NULL },
{ "enctypes", 'e', arg_strings, &etype_str,
NP_("encryption types to use", ""), "enctypes" },
{ "fcache-version", 0, arg_integer, &fcache_version,
NP_("file cache version to create", ""), NULL },
{ "addresses", 'A', arg_negative_flag, &addrs_flag,
NP_("request a ticket with no addresses", ""), NULL },
{ "extra-addresses",'a', arg_strings, &extra_addresses,
NP_("include these extra addresses", ""), "addresses" },
{ "anonymous", 0, arg_flag, &anonymous_flag,
NP_("request an anonymous ticket", ""), NULL },
{ "request-pac", 0, arg_flag, &pac_flag,
NP_("request a Windows PAC", ""), NULL },
{ "password-file", 0, arg_string, &password_file,
NP_("read the password from a file", ""), NULL },
{ "canonicalize",0, arg_flag, &canonicalize_flag,
NP_("canonicalize client principal", ""), NULL },
{ "enterprise",0, arg_flag, &enterprise_flag,
NP_("parse principal as a KRB5-NT-ENTERPRISE name", ""), NULL },
#ifdef PKINIT
{ "pk-enterprise", 0, arg_flag, &pk_enterprise_flag,
NP_("use enterprise name from certificate", ""), NULL },
{ "pk-user", 'C', arg_string, &pk_user_id,
NP_("principal's public/private/certificate identifier", ""), "id" },
{ "x509-anchors", 'D', arg_string, &pk_x509_anchors,
NP_("directory with CA certificates", ""), "directory" },
{ "pk-use-enckey", 0, arg_flag, &pk_use_enckey,
NP_("Use RSA encrypted reply (instead of DH)", ""), NULL },
#endif
#ifndef NO_NTLM
{ "ntlm-domain", 0, arg_string, &ntlm_domain,
NP_("NTLM domain", ""), "domain" },
#endif
{ "change-default", 0, arg_negative_flag, &switch_cache_flags,
NP_("switch the default cache to the new credentials cache", ""), NULL },
{ "ok-as-delegate", 0, arg_flag, &ok_as_delegate_flag,
NP_("honor ok-as-delegate on tickets", ""), NULL },
{ "fast-armor-cache", 0, arg_string, &fast_armor_cache_string,
NP_("use this credential cache as FAST armor cache", ""), "cache" },
{ "use-referrals", 0, arg_flag, &use_referrals_flag,
NP_("only use referrals, no dns canalisation", ""), NULL },
{ "windows", 0, arg_flag, &windows_flag,
NP_("get windows behavior", ""), NULL },
{ "version", 0, arg_flag, &version_flag, NULL, NULL },
{ "help", 0, arg_flag, &help_flag, NULL, NULL }
};
static void
usage(int ret)
{
arg_printusage_i18n(args, sizeof(args)/sizeof(*args), N_("Usage: ", ""),
NULL, "[principal [command]]", getarg_i18n);
exit(ret);
}
static krb5_error_code
get_server(krb5_context context,
krb5_principal client,
const char *server,
krb5_principal *princ)
{
krb5_const_realm realm;
if (server)
return krb5_parse_name(context, server, princ);
realm = krb5_principal_get_realm(context, client);
return krb5_make_principal(context, princ, realm,
KRB5_TGS_NAME, realm, NULL);
}
static krb5_error_code
copy_configs(krb5_context context,
krb5_ccache dst,
krb5_ccache src,
krb5_principal start_ticket_server)
{
krb5_error_code ret;
const char *cfg_names[] = {"realm-config", "FriendlyName", NULL};
const char *cfg_names_w_pname[] = {"fast_avail", NULL};
krb5_data cfg_data;
size_t i;
for (i = 0; cfg_names[i]; i++) {
ret = krb5_cc_get_config(context, src, NULL, cfg_names[i], &cfg_data);
if (ret == KRB5_CC_NOTFOUND || ret == KRB5_CC_END) {
continue;
} else if (ret) {
krb5_warn(context, ret, "krb5_cc_get_config");
return ret;
}
ret = krb5_cc_set_config(context, dst, NULL, cfg_names[i], &cfg_data);
if (ret)
krb5_warn(context, ret, "krb5_cc_set_config");
}
for (i = 0; start_ticket_server && cfg_names_w_pname[i]; i++) {
ret = krb5_cc_get_config(context, src, start_ticket_server,
cfg_names_w_pname[i], &cfg_data);
if (ret == KRB5_CC_NOTFOUND || ret == KRB5_CC_END) {
continue;
} else if (ret) {
krb5_warn(context, ret, "krb5_cc_get_config");
return ret;
}
ret = krb5_cc_set_config(context, dst, start_ticket_server,
cfg_names_w_pname[i], &cfg_data);
if (ret && ret != KRB5_CC_NOTFOUND)
krb5_warn(context, ret, "krb5_cc_set_config");
}
/*
* We don't copy cc configs for any other principals though (mostly
* those are per-target time offsets and the like, so it's bad to
* lose them, but hardly the end of the world, and as they may not
* expire anyways, it's good to let them go).
*/
return 0;
}
static krb5_error_code
renew_validate(krb5_context context,
int renew,
int validate,
krb5_ccache cache,
const char *server,
krb5_deltat life)
{
krb5_error_code ret;
krb5_ccache tempccache = NULL;
krb5_creds in, *out = NULL;
krb5_kdc_flags flags;
memset(&in, 0, sizeof(in));
ret = krb5_cc_get_principal(context, cache, &in.client);
if (ret) {
krb5_warn(context, ret, "krb5_cc_get_principal");
return ret;
}
ret = get_server(context, in.client, server, &in.server);
if (ret) {
krb5_warn(context, ret, "get_server");
goto out;
}
if (renew) {
/*
* no need to check the error here, it's only to be
* friendly to the user
*/
krb5_get_credentials(context, KRB5_GC_CACHED, cache, &in, &out);
}
flags.i = 0;
flags.b.renewable = flags.b.renew = renew;
flags.b.validate = validate;
if (forwardable_flag != -1)
flags.b.forwardable = forwardable_flag;
else if (out)
flags.b.forwardable = out->flags.b.forwardable;
if (proxiable_flag != -1)
flags.b.proxiable = proxiable_flag;
else if (out)
flags.b.proxiable = out->flags.b.proxiable;
if (anonymous_flag)
flags.b.request_anonymous = anonymous_flag;
if (life)
in.times.endtime = time(NULL) + life;
if (out) {
krb5_free_creds(context, out);
out = NULL;
}
ret = krb5_get_kdc_cred(context,
cache,
flags,
NULL,
NULL,
&in,
&out);
if (ret) {
krb5_warn(context, ret, "krb5_get_kdc_cred");
goto out;
}
ret = krb5_cc_new_unique(context, krb5_cc_get_type(context, cache),
NULL, &tempccache);
if (ret) {
krb5_warn(context, ret, "krb5_cc_new_unique");
goto out;
}
ret = krb5_cc_initialize(context, tempccache, in.client);
if (ret) {
krb5_warn(context, ret, "krb5_cc_initialize");
goto out;
}
ret = krb5_cc_store_cred(context, tempccache, out);
if (ret) {
krb5_warn(context, ret, "krb5_cc_store_cred");
goto out;
}
/*
* We want to preserve cc configs as some are security-relevant, and
* anyways it's the friendly thing to do.
*/
ret = copy_configs(context, tempccache, cache, out->server);
if (ret)
goto out;
ret = krb5_cc_move(context, tempccache, cache);
if (ret) {
krb5_warn(context, ret, "krb5_cc_move");
goto out;
}
tempccache = NULL;
out:
if (tempccache)
krb5_cc_close(context, tempccache);
if (out)
krb5_free_creds(context, out);
krb5_free_cred_contents(context, &in);
return ret;
}
#ifndef NO_NTLM
static krb5_error_code
store_ntlmkey(krb5_context context, krb5_ccache id,
const char *domain, struct ntlm_buf *buf)
{
krb5_error_code ret;
krb5_data data;
char *name;
int aret;
ret = krb5_cc_get_config(context, id, NULL, "default-ntlm-domain", &data);
if (ret == 0) {
krb5_data_free(&data);
} else {
data.length = strlen(domain);
data.data = rk_UNCONST(domain);
ret = krb5_cc_set_config(context, id, NULL, "default-ntlm-domain", &data);
if (ret != 0)
return ret;
}
aret = asprintf(&name, "ntlm-key-%s", domain);
if (aret == -1 || name == NULL)
return krb5_enomem(context);
data.length = buf->length;
data.data = buf->data;
ret = krb5_cc_set_config(context, id, NULL, name, &data);
free(name);
return ret;
}
#endif
static krb5_error_code
get_new_tickets(krb5_context context,
krb5_principal principal,
krb5_ccache ccache,
krb5_deltat ticket_life,
int interactive)
{
krb5_error_code ret;
krb5_creds cred;
char passwd[256];
krb5_deltat start_time = 0;
krb5_deltat renew = 0;
const char *renewstr = NULL;
krb5_enctype *enctype = NULL;
krb5_ccache tempccache = NULL;
krb5_init_creds_context ctx = NULL;
krb5_get_init_creds_opt *opt = NULL;
krb5_prompter_fct prompter = krb5_prompter_posix;
#ifndef NO_NTLM
struct ntlm_buf ntlmkey;
memset(&ntlmkey, 0, sizeof(ntlmkey));
#endif
passwd[0] = '\0';
if (!interactive)
prompter = NULL;
if (password_file) {
FILE *f;
if (strcasecmp("STDIN", password_file) == 0)
f = stdin;
else
f = fopen(password_file, "r");
if (f == NULL) {
krb5_warnx(context, "Failed to open the password file %s",
password_file);
return errno;
}
if (fgets(passwd, sizeof(passwd), f) == NULL) {
krb5_warnx(context, N_("Failed to read password from file %s", ""),
password_file);
fclose(f);
return EINVAL; /* XXX Need a better error */
}
if (f != stdin)
fclose(f);
passwd[strcspn(passwd, "\n")] = '\0';
}
#ifdef __APPLE__
if (passwd[0] == '\0') {
const char *realm;
OSStatus osret;
UInt32 length;
void *buffer;
char *name;
realm = krb5_principal_get_realm(context, principal);
ret = krb5_unparse_name_flags(context, principal,
KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
if (ret)
goto nopassword;
osret = SecKeychainFindGenericPassword(NULL, strlen(realm), realm,
strlen(name), name,
&length, &buffer, NULL);
free(name);
if (osret == noErr && length < sizeof(passwd) - 1) {
memcpy(passwd, buffer, length);
passwd[length] = '\0';
}
nopassword:
do { } while(0);
}
#endif
memset(&cred, 0, sizeof(cred));
ret = krb5_get_init_creds_opt_alloc(context, &opt);
if (ret) {
krb5_warn(context, ret, "krb5_get_init_creds_opt_alloc");
goto out;
}
krb5_get_init_creds_opt_set_default_flags(context, "kinit",
krb5_principal_get_realm(context, principal), opt);
if (forwardable_flag != -1)
krb5_get_init_creds_opt_set_forwardable(opt, forwardable_flag);
if (proxiable_flag != -1)
krb5_get_init_creds_opt_set_proxiable(opt, proxiable_flag);
if (anonymous_flag)
krb5_get_init_creds_opt_set_anonymous(opt, anonymous_flag);
if (pac_flag != -1)
krb5_get_init_creds_opt_set_pac_request(context, opt,
pac_flag ? TRUE : FALSE);
if (canonicalize_flag)
krb5_get_init_creds_opt_set_canonicalize(context, opt, TRUE);
if (pk_enterprise_flag || enterprise_flag || canonicalize_flag || windows_flag)
krb5_get_init_creds_opt_set_win2k(context, opt, TRUE);
if (pk_user_id || ent_user_id || anonymous_flag) {
ret = krb5_get_init_creds_opt_set_pkinit(context, opt,
principal,
pk_user_id,
pk_x509_anchors,
NULL,
NULL,
pk_use_enckey ? 2 : 0 |
anonymous_flag ? 4 : 0,
prompter,
NULL,
passwd);
if (ret) {
krb5_warn(context, ret, "krb5_get_init_creds_opt_set_pkinit");
goto out;
}
if (ent_user_id)
krb5_get_init_creds_opt_set_pkinit_user_certs(context, opt, ent_user_id);
}
if (addrs_flag != -1)
krb5_get_init_creds_opt_set_addressless(context, opt,
addrs_flag ? FALSE : TRUE);
if (renew_life == NULL && renewable_flag)
renewstr = "6 months";
if (renew_life)
renewstr = renew_life;
if (renewstr) {
renew = parse_time(renewstr, "s");
if (renew < 0)
errx(1, "unparsable time: %s", renewstr);
krb5_get_init_creds_opt_set_renew_life(opt, renew);
}
if (ticket_life != 0)
krb5_get_init_creds_opt_set_tkt_life(opt, ticket_life);
if (start_str) {
int tmp = parse_time(start_str, "s");
if (tmp < 0)
errx(1, N_("unparsable time: %s", ""), start_str);
start_time = tmp;
}
if (etype_str.num_strings) {
int i;
enctype = malloc(etype_str.num_strings * sizeof(*enctype));
if (enctype == NULL)
errx(1, "out of memory");
for(i = 0; i < etype_str.num_strings; i++) {
ret = krb5_string_to_enctype(context,
etype_str.strings[i],
&enctype[i]);
if (ret)
errx(1, "unrecognized enctype: %s", etype_str.strings[i]);
}
krb5_get_init_creds_opt_set_etype_list(opt, enctype,
etype_str.num_strings);
}
ret = krb5_init_creds_init(context, principal, prompter, NULL, start_time, opt, &ctx);
if (ret) {
krb5_warn(context, ret, "krb5_init_creds_init");
goto out;
}
if (server_str) {
ret = krb5_init_creds_set_service(context, ctx, server_str);
if (ret) {
krb5_warn(context, ret, "krb5_init_creds_set_service");
goto out;
}
}
if (fast_armor_cache_string) {
krb5_ccache fastid;
ret = krb5_cc_resolve(context, fast_armor_cache_string, &fastid);
if (ret) {
krb5_warn(context, ret, "krb5_cc_resolve(FAST cache)");
goto out;
}
ret = krb5_init_creds_set_fast_ccache(context, ctx, fastid);
if (ret) {
krb5_warn(context, ret, "krb5_init_creds_set_fast_ccache");
goto out;
}
}
if (use_keytab || keytab_str) {
ret = krb5_init_creds_set_keytab(context, ctx, kt);
if (ret) {
krb5_warn(context, ret, "krb5_init_creds_set_keytab");
goto out;
}
} else if (pk_user_id || ent_user_id || anonymous_flag) {
} else if (!interactive && passwd[0] == '\0') {
static int already_warned = 0;
if (!already_warned)
krb5_warnx(context, "Not interactive, failed to get "
"initial ticket");
krb5_get_init_creds_opt_free(context, opt);
already_warned = 1;
return 0;
} else {
if (passwd[0] == '\0') {
char *p, *prompt;
int aret = 0;
ret = krb5_unparse_name(context, principal, &p);
if (ret)
errx(1, "failed to generate passwd prompt: not enough memory");
aret = asprintf(&prompt, N_("%s's Password: ", ""), p);
free(p);
if (aret == -1)
errx(1, "failed to generate passwd prompt: not enough memory");
if (UI_UTIL_read_pw_string(passwd, sizeof(passwd)-1, prompt, 0)){
memset(passwd, 0, sizeof(passwd));
errx(1, "failed to read password");
}
free(prompt);
}
if (passwd[0]) {
ret = krb5_init_creds_set_password(context, ctx, passwd);
if (ret) {
krb5_warn(context, ret, "krb5_init_creds_set_password");
goto out;
}
}
}
ret = krb5_init_creds_get(context, ctx);
#ifndef NO_NTLM
if (ntlm_domain && passwd[0])
heim_ntlm_nt_key(passwd, &ntlmkey);
#endif
memset(passwd, 0, sizeof(passwd));
switch(ret){
case 0:
break;
case KRB5_LIBOS_PWDINTR: /* don't print anything if it was just C-c:ed */
exit(1);
case KRB5KRB_AP_ERR_BAD_INTEGRITY:
case KRB5KRB_AP_ERR_MODIFIED:
case KRB5KDC_ERR_PREAUTH_FAILED:
case KRB5_GET_IN_TKT_LOOP:
krb5_warnx(context, N_("Password incorrect", ""));
goto out;
case KRB5KRB_AP_ERR_V4_REPLY:
krb5_warnx(context, N_("Looks like a Kerberos 4 reply", ""));
goto out;
case KRB5KDC_ERR_KEY_EXPIRED:
krb5_warnx(context, N_("Password expired", ""));
goto out;
default:
krb5_warn(context, ret, "krb5_get_init_creds");
goto out;
}
krb5_process_last_request(context, opt, ctx);
ret = krb5_init_creds_get_creds(context, ctx, &cred);
if (ret) {
krb5_warn(context, ret, "krb5_init_creds_get_creds");
goto out;
}
if (ticket_life != 0) {
if (labs(cred.times.endtime - cred.times.starttime - ticket_life) > 30) {
char life[64];
unparse_time_approx(cred.times.endtime - cred.times.starttime,
life, sizeof(life));
krb5_warnx(context, N_("NOTICE: ticket lifetime is %s", ""), life);
}
}
if (renew_life) {
if (labs(cred.times.renew_till - cred.times.starttime - renew) > 30) {
char life[64];
unparse_time_approx(cred.times.renew_till - cred.times.starttime,
life, sizeof(life));
krb5_warnx(context,
N_("NOTICE: ticket renewable lifetime is %s", ""),
life);
}
}
krb5_free_cred_contents(context, &cred);
ret = krb5_cc_new_unique(context, krb5_cc_get_type(context, ccache),
NULL, &tempccache);
if (ret) {
krb5_warn(context, ret, "krb5_cc_new_unique");
goto out;
}
ret = krb5_init_creds_store(context, ctx, tempccache);
if (ret) {
krb5_warn(context, ret, "krb5_init_creds_store");
goto out;
}
krb5_init_creds_free(context, ctx);
ctx = NULL;
ret = krb5_cc_move(context, tempccache, ccache);
if (ret) {
krb5_warn(context, ret, "krb5_cc_move");
goto out;
}
tempccache = NULL;
if (switch_cache_flags)
krb5_cc_switch(context, ccache);
#ifndef NO_NTLM
if (ntlm_domain && ntlmkey.data)
store_ntlmkey(context, ccache, ntlm_domain, &ntlmkey);
#endif
if (ok_as_delegate_flag || windows_flag || use_referrals_flag) {
unsigned char d = 0;
krb5_data data;
if (ok_as_delegate_flag || windows_flag)
d |= 1;
if (use_referrals_flag || windows_flag)
d |= 2;
data.length = 1;
data.data = &d;
krb5_cc_set_config(context, ccache, NULL, "realm-config", &data);
}
out:
krb5_get_init_creds_opt_free(context, opt);
if (ctx)
krb5_init_creds_free(context, ctx);
if (tempccache)
krb5_cc_close(context, tempccache);
if (enctype)
free(enctype);
return ret;
}
static time_t
ticket_lifetime(krb5_context context, krb5_ccache cache, krb5_principal client,
const char *server, time_t *renew)
{
krb5_creds in_cred, *cred;
krb5_error_code ret;
time_t timeout;
time_t curtime;
memset(&in_cred, 0, sizeof(in_cred));
if (renew != NULL)
*renew = 0;
ret = krb5_cc_get_principal(context, cache, &in_cred.client);
if (ret) {
krb5_warn(context, ret, "krb5_cc_get_principal");
return 0;
}
ret = get_server(context, in_cred.client, server, &in_cred.server);
if (ret) {
krb5_free_principal(context, in_cred.client);
krb5_warn(context, ret, "get_server");
return 0;
}
ret = krb5_get_credentials(context, KRB5_GC_CACHED,
cache, &in_cred, &cred);
krb5_free_principal(context, in_cred.client);
krb5_free_principal(context, in_cred.server);
if (ret) {
krb5_warn(context, ret, "krb5_get_credentials");
return 0;
}
curtime = time(NULL);
timeout = cred->times.endtime - curtime;
if (timeout < 0)
timeout = 0;
if (renew) {
*renew = cred->times.renew_till - curtime;
if (*renew < 0)
*renew = 0;
}
krb5_free_creds(context, cred);
return timeout;
}
static time_t expire;
static char siginfo_msg[1024] = "No credentials\n";
static void
update_siginfo_msg(time_t exp, const char *srv)
{
/* Note that exp is relative time */
memset(siginfo_msg, 0, sizeof(siginfo_msg));
memcpy(&siginfo_msg, "Updating...\n", sizeof("Updating...\n"));
if (exp) {
if (srv == NULL) {
snprintf(siginfo_msg, sizeof(siginfo_msg),
N_("kinit: TGT expires in %llu seconds\n", ""),
(unsigned long long)expire);
} else {
snprintf(siginfo_msg, sizeof(siginfo_msg),
N_("kinit: Ticket for %s expired\n", ""), srv);
}
return;
}
/* Expired creds */
if (srv == NULL) {
snprintf(siginfo_msg, sizeof(siginfo_msg),
N_("kinit: TGT expired\n", ""));
} else {
snprintf(siginfo_msg, sizeof(siginfo_msg),
N_("kinit: Ticket for %s expired\n", ""), srv);
}
}
#ifdef HAVE_SIGACTION
static void
handle_siginfo(int sig)
{
struct iovec iov[2];
iov[0].iov_base = rk_UNCONST(siginfo_msg);
iov[0].iov_len = strlen(siginfo_msg);
iov[1].iov_base = "\n";
iov[1].iov_len = 1;
writev(STDERR_FILENO, iov, sizeof(iov)/sizeof(iov[0]));
}
#endif
struct renew_ctx {
krb5_context context;
krb5_ccache ccache;
krb5_principal principal;
krb5_deltat ticket_life;
krb5_deltat timeout;
};
static time_t
renew_func(void *ptr)
{
krb5_error_code ret;
struct renew_ctx *ctx = ptr;
time_t renew_expire;
static time_t exp_delay = 1;
/*
* NOTE: We count on the ccache implementation to notice changes to the
* actual ccache filesystem/whatever objects. There should be no ccache
* types for which this is not the case, but it might not hurt to
* re-krb5_cc_resolve() after each successful renew_validate()/
* get_new_tickets() call.
*/
expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
server_str, &renew_expire);
/*
* When a keytab is available to obtain new tickets, if we are within
* half of the original ticket lifetime of the renew limit, get a new
* TGT instead of renewing the existing TGT. Note, ctx->ticket_life
* is zero by default (without a '-l' option) and cannot be used to
* set the time scale on which we decide whether we're "close to the
* renew limit".
*/
if (use_keytab || keytab_str)
expire += ctx->timeout;
if (renew_expire > expire) {
ret = renew_validate(ctx->context, 1, validate_flag, ctx->ccache,
server_str, ctx->ticket_life);
} else {
ret = get_new_tickets(ctx->context, ctx->principal, ctx->ccache,
ctx->ticket_life, 0);
}
expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
server_str, &renew_expire);
#ifndef NO_AFS
if (ret == 0 && server_str == NULL && do_afslog && k_hasafs())
krb5_afslog(ctx->context, ctx->ccache, NULL, NULL);
#endif
update_siginfo_msg(expire, server_str);
/*
* If our tickets have expired and we been able to either renew them
* or obtain new tickets, then we still call this function but we use
* an exponential backoff. This should take care of the case where
* we are using stored credentials but the KDC has been unavailable
* for some reason...
*/
if (expire < 1) {
/*
* We can't ask to keep spamming stderr but not syslog, so we warn
* only once.
*/
if (exp_delay == 1) {
krb5_warnx(ctx->context, N_("NOTICE: Could not renew/refresh "
"tickets", ""));
}
if (exp_delay < 7200)
exp_delay += exp_delay / 2 + 1;
return exp_delay;
}
exp_delay = 1;
return expire / 2 + 1;
}
static void
set_princ_realm(krb5_context context,
krb5_principal principal,
const char *realm)
{
krb5_error_code ret;
if ((ret = krb5_principal_set_realm(context, principal, realm)) != 0)
krb5_err(context, 1, ret, "krb5_principal_set_realm");
}
static void
parse_name_realm(krb5_context context,
const char *name,
int flags,
const char *realm,
krb5_principal *princ)
{
krb5_error_code ret;
if (realm)
flags |= KRB5_PRINCIPAL_PARSE_NO_DEF_REALM;
if ((ret = krb5_parse_name_flags(context, name, flags, princ)) != 0)
krb5_err(context, 1, ret, "krb5_parse_name_flags");
if (realm && krb5_principal_get_realm(context, *princ) == NULL)
set_princ_realm(context, *princ, realm);
}
static char *
get_default_realm(krb5_context context)
{
char *realm;
krb5_error_code ret;
if ((ret = krb5_get_default_realm(context, &realm)) != 0)
krb5_err(context, 1, ret, "krb5_get_default_realm");
return realm;
}
static void
get_default_principal(krb5_context context, krb5_principal *princ)
{
krb5_error_code ret;
if ((ret = krb5_get_default_principal(context, princ)) != 0)
krb5_err(context, 1, ret, "krb5_get_default_principal");
}
static char *
get_user_realm(krb5_context context)
{
krb5_error_code ret;
char *user_realm = NULL;
/*
* If memory allocation fails, we don't try to use the wrong realm,
* that will trigger misleading error messages complicate support.
*/
krb5_appdefault_string(context, "kinit", NULL, "user_realm", "",
&user_realm);
if (user_realm == NULL) {
ret = krb5_enomem(context);
krb5_err(context, 1, ret, "krb5_appdefault_string");
}
if (*user_realm == 0) {
free(user_realm);
user_realm = NULL;
}
return user_realm;
}
static void
get_princ(krb5_context context, krb5_principal *principal, const char *name)
{
krb5_error_code ret;
krb5_principal tmp;
int parseflags = 0;
char *user_realm;
if (name == NULL) {
krb5_ccache ccache;
/* If credential cache provides a client principal, use that. */
if (krb5_cc_default(context, &ccache) == 0) {
ret = krb5_cc_get_principal(context, ccache, principal);
krb5_cc_close(context, ccache);
if (ret == 0)
return;
}
}
user_realm = get_user_realm(context);
if (name) {
if (canonicalize_flag || enterprise_flag)
parseflags |= KRB5_PRINCIPAL_PARSE_ENTERPRISE;
parse_name_realm(context, name, parseflags, user_realm, &tmp);
if (user_realm && krb5_principal_get_num_comp(context, tmp) > 1) {
/* Principal is instance qualified, reparse with default realm. */
krb5_free_principal(context, tmp);
parse_name_realm(context, name, parseflags, NULL, principal);
} else {
*principal = tmp;
}
} else {
get_default_principal(context, principal);
if (user_realm)
set_princ_realm(context, *principal, user_realm);
}
if (user_realm)
free(user_realm);
}
static void
get_princ_kt(krb5_context context,
krb5_principal *principal,
char *name)
{
krb5_error_code ret;
krb5_principal tmp;
krb5_ccache ccache;
krb5_kt_cursor cursor;
krb5_keytab_entry entry;
char *def_realm;
if (name == NULL) {
/*
* If the credential cache exists and specifies a client principal,
* use that.
*/
if (krb5_cc_default(context, &ccache) == 0) {
ret = krb5_cc_get_principal(context, ccache, principal);
krb5_cc_close(context, ccache);
if (ret == 0)
return;
}
}
if (name) {
/* If the principal specifies an explicit realm, just use that. */
int parseflags = KRB5_PRINCIPAL_PARSE_NO_DEF_REALM;
parse_name_realm(context, name, parseflags, NULL, &tmp);
if (krb5_principal_get_realm(context, tmp) != NULL) {
*principal = tmp;
return;
}
} else {
/* Otherwise, search keytab for bare name of the default principal. */
get_default_principal(context, &tmp);
set_princ_realm(context, tmp, NULL);
}
def_realm = get_default_realm(context);
ret = krb5_kt_start_seq_get(context, kt, &cursor);
if (ret)
krb5_err(context, 1, ret, "krb5_kt_start_seq_get");
while (ret == 0 &&
krb5_kt_next_entry(context, kt, &entry, &cursor) == 0) {
const char *realm;
if (!krb5_principal_compare_any_realm(context, tmp, entry.principal))
continue;
if (*principal &&
krb5_principal_compare(context, *principal, entry.principal))
continue;
/* The default realm takes precedence */
realm = krb5_principal_get_realm(context, entry.principal);
if (*principal && strcmp(def_realm, realm) == 0) {
krb5_free_principal(context, *principal);
ret = krb5_copy_principal(context, entry.principal, principal);
break;
}
if (!*principal)
ret = krb5_copy_principal(context, entry.principal, principal);
}
if (ret != 0 || (ret = krb5_kt_end_seq_get(context, kt, &cursor)) != 0)
krb5_err(context, 1, ret, "get_princ_kt");
if (!*principal) {
if (name)
parse_name_realm(context, name, 0, NULL, principal);
else
krb5_err(context, 1, KRB5_CC_NOTFOUND, "get_princ_kt");
}
krb5_free_principal(context, tmp);
free(def_realm);
}
static krb5_error_code
get_switched_ccache(krb5_context context,
const char * type,
krb5_principal principal,
krb5_ccache *ccache)
{
krb5_error_code ret;
#ifdef _WIN32
if (strcmp(type, "API") == 0) {
/*
* Windows stores the default ccache name in the
* registry which is shared across multiple logon
* sessions for the same user. The API credential
* cache provides a unique name space per logon
* session. Therefore there is no need to generate
* a unique ccache name. Instead use the principal
* name. This provides a friendlier user experience.
*/
char * unparsed_name;
char * cred_cache;
ret = krb5_unparse_name(context, principal,
&unparsed_name);
if (ret)
krb5_err(context, 1, ret,
N_("unparsing principal name", ""));
ret = asprintf(&cred_cache, "API:%s", unparsed_name);
krb5_free_unparsed_name(context, unparsed_name);
if (ret == -1 || cred_cache == NULL)
krb5_err(context, 1, ret,
N_("building credential cache name", ""));
ret = krb5_cc_resolve(context, cred_cache, ccache);
free(cred_cache);
} else if (strcmp(type, "MSLSA") == 0) {
/*
* The Windows MSLSA cache when it is writeable
* stores tickets for multiple client principals
* in a single credential cache.
*/
ret = krb5_cc_resolve(context, "MSLSA:", ccache);
} else {
ret = krb5_cc_new_unique(context, type, NULL, ccache);
}
#else /* !_WIN32 */
ret = krb5_cc_new_unique(context, type, NULL, ccache);
#endif /* _WIN32 */
return ret;
}
int
main(int argc, char **argv)
{
krb5_error_code ret;
krb5_context context;
krb5_ccache ccache;
krb5_principal principal = NULL;
int optidx = 0;
krb5_deltat ticket_life = 0;
#ifdef HAVE_SIGACTION
struct sigaction sa;
#endif
setprogname(argv[0]);
setlocale(LC_ALL, "");
bindtextdomain("heimdal_kuser", HEIMDAL_LOCALEDIR);
textdomain("heimdal_kuser");
ret = krb5_init_context(&context);
if (ret == KRB5_CONFIG_BADFORMAT)
errx(1, "krb5_init_context failed to parse configuration file");
else if (ret)
errx(1, "krb5_init_context failed: %d", ret);
if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
usage(1);
if (help_flag)
usage(0);
if (version_flag) {
print_version(NULL);
exit(0);
}
argc -= optidx;
argv += optidx;
/*
* Open the keytab now, we use the keytab to determine the principal's
* realm when the requested principal has no realm.
*/
if (use_keytab || keytab_str) {
if (keytab_str)
ret = krb5_kt_resolve(context, keytab_str, &kt);
else
ret = krb5_kt_default(context, &kt);
if (ret)
krb5_err(context, 1, ret, "resolving keytab");
}
if (pk_enterprise_flag) {
ret = krb5_pk_enterprise_cert(context, pk_user_id,
argv[0], &principal,
&ent_user_id);
if (ret)
krb5_err(context, 1, ret, "krb5_pk_enterprise_certs");
pk_user_id = NULL;
} else if (anonymous_flag) {
ret = krb5_make_principal(context, &principal, argv[0],
KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME,
NULL);
if (ret)
krb5_err(context, 1, ret, "krb5_make_principal");
krb5_principal_set_type(context, principal, KRB5_NT_WELLKNOWN);
} else if (use_keytab || keytab_str) {
get_princ_kt(context, &principal, argv[0]);
} else {
get_princ(context, &principal, argv[0]);
}
if (fcache_version)
krb5_set_fcache_version(context, fcache_version);
if (renewable_flag == -1)
/* this seems somewhat pointless, but whatever */
krb5_appdefault_boolean(context, "kinit",
krb5_principal_get_realm(context, principal),
"renewable", FALSE, &renewable_flag);
if (do_afslog == -1)
krb5_appdefault_boolean(context, "kinit",
krb5_principal_get_realm(context, principal),
"afslog", TRUE, &do_afslog);
if (cred_cache)
ret = krb5_cc_resolve(context, cred_cache, &ccache);
else {
if (argc > 1) {
char s[1024];
ret = krb5_cc_new_unique(context, NULL, NULL, &ccache);
if (ret)
krb5_err(context, 1, ret, "creating cred cache");
snprintf(s, sizeof(s), "%s:%s",
krb5_cc_get_type(context, ccache),
krb5_cc_get_name(context, ccache));
setenv("KRB5CCNAME", s, 1);
} else {
ret = krb5_cc_cache_match(context, principal, &ccache);
if (ret) {
const char *type;
ret = krb5_cc_default(context, &ccache);
if (ret)
krb5_err(context, 1, ret,
N_("resolving credentials cache", ""));
/*
* Check if the type support switching, and we do,
* then do that instead over overwriting the current
* default credential
*/
type = krb5_cc_get_type(context, ccache);
if (krb5_cc_support_switch(context, type)) {
krb5_cc_close(context, ccache);
ret = get_switched_ccache(context, type, principal,
&ccache);
}
}
}
}
if (ret)
krb5_err(context, 1, ret, N_("resolving credentials cache", ""));
#ifndef NO_AFS
if (argc > 1 && k_hasafs())
k_setpag();
#endif
if (lifetime) {
int tmp = parse_time(lifetime, "s");
if (tmp < 0)
errx(1, N_("unparsable time: %s", ""), lifetime);
ticket_life = tmp;
}
if (addrs_flag == 0 && extra_addresses.num_strings > 0)
krb5_errx(context, 1,
N_("specifying both extra addresses and "
"no addresses makes no sense", ""));
{
int i;
krb5_addresses addresses;
memset(&addresses, 0, sizeof(addresses));
for(i = 0; i < extra_addresses.num_strings; i++) {
ret = krb5_parse_address(context, extra_addresses.strings[i],
&addresses);
if (ret == 0) {
krb5_add_extra_addresses(context, &addresses);
krb5_free_addresses(context, &addresses);
}
}
free_getarg_strings(&extra_addresses);
}
if (renew_flag || validate_flag) {
ret = renew_validate(context, renew_flag, validate_flag,
ccache, server_str, ticket_life);
#ifndef NO_AFS
if (ret == 0 && server_str == NULL && do_afslog && k_hasafs())
krb5_afslog(context, ccache, NULL, NULL);
#endif
exit(ret != 0);
}
ret = get_new_tickets(context, principal, ccache, ticket_life, 1);
if (ret)
exit(1);
#ifndef NO_AFS
if (ret == 0 && server_str == NULL && do_afslog && k_hasafs())
krb5_afslog(context, ccache, NULL, NULL);
#endif
if (argc > 1) {
struct renew_ctx ctx;
time_t timeout;
timeout = ticket_lifetime(context, ccache, principal,
server_str, NULL) / 2;
ctx.context = context;
ctx.ccache = ccache;
ctx.principal = principal;
ctx.ticket_life = ticket_life;
ctx.timeout = timeout;
#ifdef HAVE_SIGACTION
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = handle_siginfo;
sigaction(SIGINFO, &sa, NULL);
#endif
ret = simple_execvp_timed(argv[1], argv+1,
renew_func, &ctx, timeout);
#define EX_NOEXEC 126
#define EX_NOTFOUND 127
if (ret == EX_NOEXEC)
krb5_warnx(context, N_("permission denied: %s", ""), argv[1]);
else if (ret == EX_NOTFOUND)
krb5_warnx(context, N_("command not found: %s", ""), argv[1]);
krb5_cc_destroy(context, ccache);
#ifndef NO_AFS
if (k_hasafs())
k_unlog();
#endif
} else {
krb5_cc_close(context, ccache);
ret = 0;
}
krb5_free_principal(context, principal);
if (kt)
krb5_kt_close(context, kt);
krb5_free_context(context);
return ret;
}
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