139384277SMark Murray /*- 2e0bc7412SJacques Vidrine * This pam_krb5 module contains code that is: 3e0bc7412SJacques Vidrine * Copyright (c) Derrick J. Brashear, 1996. All rights reserved. 4e0bc7412SJacques Vidrine * Copyright (c) Frank Cusack, 1999-2001. All rights reserved. 5e0bc7412SJacques Vidrine * Copyright (c) Jacques A. Vidrine, 2000-2001. All rights reserved. 6e0bc7412SJacques Vidrine * Copyright (c) Nicolas Williams, 2001. All rights reserved. 7e0bc7412SJacques Vidrine * Copyright (c) Perot Systems Corporation, 2001. All rights reserved. 8e0bc7412SJacques Vidrine * Copyright (c) Mark R V Murray, 2001. All rights reserved. 916417879SRobert Watson * Copyright (c) Networks Associates Technology, Inc., 2002-2005. 10111ccd25SDag-Erling Smørgrav * All rights reserved. 11111ccd25SDag-Erling Smørgrav * 12111ccd25SDag-Erling Smørgrav * Portions of this software were developed for the FreeBSD Project by 13111ccd25SDag-Erling Smørgrav * ThinkSec AS and NAI Labs, the Security Research Division of Network 14111ccd25SDag-Erling Smørgrav * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 15111ccd25SDag-Erling Smørgrav * ("CBOSS"), as part of the DARPA CHATS research program. 1639384277SMark Murray * 1739384277SMark Murray * Redistribution and use in source and binary forms, with or without 1839384277SMark Murray * modification, are permitted provided that the following conditions 1939384277SMark Murray * are met: 2039384277SMark Murray * 1. Redistributions of source code must retain the above copyright 21e0bc7412SJacques Vidrine * notices, and the entire permission notice in its entirety, 2239384277SMark Murray * including the disclaimer of warranties. 2339384277SMark Murray * 2. Redistributions in binary form must reproduce the above copyright 2439384277SMark Murray * notice, this list of conditions and the following disclaimer in the 2539384277SMark Murray * documentation and/or other materials provided with the distribution. 2639384277SMark Murray * 3. The name of the author may not be used to endorse or promote 2739384277SMark Murray * products derived from this software without specific prior 2839384277SMark Murray * written permission. 2939384277SMark Murray * 3039384277SMark Murray * ALTERNATIVELY, this product may be distributed under the terms of 3139384277SMark Murray * the GNU Public License, in which case the provisions of the GPL are 3239384277SMark Murray * required INSTEAD OF the above restrictions. (This clause is 3339384277SMark Murray * necessary due to a potential bad interaction between the GPL and 3439384277SMark Murray * the restrictions contained in a BSD-style copyright.) 3539384277SMark Murray * 3639384277SMark Murray * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 3739384277SMark Murray * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 3839384277SMark Murray * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 3939384277SMark Murray * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 4039384277SMark Murray * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 4139384277SMark Murray * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 4239384277SMark Murray * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4339384277SMark Murray * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 4439384277SMark Murray * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 4539384277SMark Murray * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 4639384277SMark Murray * OF THE POSSIBILITY OF SUCH DAMAGE. 4739384277SMark Murray * 4839384277SMark Murray */ 4939384277SMark Murray 50ceaf33f5SMatthew Dillon #include <sys/cdefs.h> 51ceaf33f5SMatthew Dillon __FBSDID("$FreeBSD$"); 52ceaf33f5SMatthew Dillon 5339384277SMark Murray #include <sys/types.h> 5439384277SMark Murray #include <sys/stat.h> 5539384277SMark Murray #include <errno.h> 5639384277SMark Murray #include <limits.h> 5739384277SMark Murray #include <pwd.h> 5839384277SMark Murray #include <stdio.h> 5939384277SMark Murray #include <stdlib.h> 60111ccd25SDag-Erling Smørgrav #include <string.h> 6139384277SMark Murray #include <syslog.h> 6239384277SMark Murray #include <unistd.h> 6339384277SMark Murray 6439384277SMark Murray #include <krb5.h> 6539384277SMark Murray #include <com_err.h> 6639384277SMark Murray 6739384277SMark Murray #define PAM_SM_AUTH 6839384277SMark Murray #define PAM_SM_ACCOUNT 6939384277SMark Murray #define PAM_SM_PASSWORD 7039384277SMark Murray 7139384277SMark Murray #include <security/pam_appl.h> 7239384277SMark Murray #include <security/pam_modules.h> 738c66575dSDag-Erling Smørgrav #include <security/pam_mod_misc.h> 74545aa471SDag-Erling Smørgrav #include <security/openpam.h> 7539384277SMark Murray 7639384277SMark Murray #define COMPAT_HEIMDAL 7739384277SMark Murray /* #define COMPAT_MIT */ 7839384277SMark Murray 7939384277SMark Murray static int verify_krb_v5_tgt(krb5_context, krb5_ccache, char *, int); 8039384277SMark Murray static void cleanup_cache(pam_handle_t *, void *, int); 8139384277SMark Murray static const char *compat_princ_component(krb5_context, krb5_principal, int); 8239384277SMark Murray static void compat_free_data_contents(krb5_context, krb5_data *); 8339384277SMark Murray 8439384277SMark Murray #define USER_PROMPT "Username: " 8539384277SMark Murray #define PASSWORD_PROMPT "Password:" 8639384277SMark Murray #define NEW_PASSWORD_PROMPT "New Password:" 8739384277SMark Murray 88545aa471SDag-Erling Smørgrav #define PAM_OPT_CCACHE "ccache" 8916417879SRobert Watson #define PAM_OPT_DEBUG "debug" 90545aa471SDag-Erling Smørgrav #define PAM_OPT_FORWARDABLE "forwardable" 91545aa471SDag-Erling Smørgrav #define PAM_OPT_NO_CCACHE "no_ccache" 92551e75c7SMartin Matuska #define PAM_OPT_NO_USER_CHECK "no_user_check" 93545aa471SDag-Erling Smørgrav #define PAM_OPT_REUSE_CCACHE "reuse_ccache" 9495748751SDoug Rabson #define PAM_OPT_NO_USER_CHECK "no_user_check" 9539384277SMark Murray 9626ec46c8SStanislav Sedov #define PAM_LOG_KRB5_ERR(ctx, rv, fmt, ...) \ 9726ec46c8SStanislav Sedov do { \ 9826ec46c8SStanislav Sedov const char *krb5msg = krb5_get_error_message(ctx, rv); \ 9926ec46c8SStanislav Sedov PAM_LOG(fmt ": %s", ##__VA_ARGS__, krb5msg); \ 10026ec46c8SStanislav Sedov krb5_free_error_message(ctx, krb5msg); \ 10126ec46c8SStanislav Sedov } while (0) 10226ec46c8SStanislav Sedov 10339384277SMark Murray /* 10439384277SMark Murray * authentication management 10539384277SMark Murray */ 10639384277SMark Murray PAM_EXTERN int 10724fe7ba0SDag-Erling Smørgrav pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, 108545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 10939384277SMark Murray { 11039384277SMark Murray krb5_error_code krbret; 11139384277SMark Murray krb5_context pam_context; 11239384277SMark Murray krb5_creds creds; 11339384277SMark Murray krb5_principal princ; 1147c2274dcSJacques Vidrine krb5_ccache ccache; 11526ec46c8SStanislav Sedov krb5_get_init_creds_opt *opts; 11639384277SMark Murray struct passwd *pwd; 11739384277SMark Murray int retval; 11864dbe1a7SDag-Erling Smørgrav const void *ccache_data; 1194911b12cSDag-Erling Smørgrav const char *user, *pass; 120af9b4074SDag-Erling Smørgrav const void *sourceuser, *service; 1217c2274dcSJacques Vidrine char *principal, *princ_name, *ccache_name, luser[32], *srvdup; 12239384277SMark Murray 12339384277SMark Murray retval = pam_get_user(pamh, &user, USER_PROMPT); 12439384277SMark Murray if (retval != PAM_SUCCESS) 12524fe7ba0SDag-Erling Smørgrav return (retval); 12639384277SMark Murray 12739384277SMark Murray PAM_LOG("Got user: %s", user); 12839384277SMark Murray 1294911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_RUSER, &sourceuser); 13039384277SMark Murray if (retval != PAM_SUCCESS) 13124fe7ba0SDag-Erling Smørgrav return (retval); 13239384277SMark Murray 1334911b12cSDag-Erling Smørgrav PAM_LOG("Got ruser: %s", (const char *)sourceuser); 13439384277SMark Murray 13539384277SMark Murray service = NULL; 1364911b12cSDag-Erling Smørgrav pam_get_item(pamh, PAM_SERVICE, &service); 13739384277SMark Murray if (service == NULL) 13839384277SMark Murray service = "unknown"; 13939384277SMark Murray 1404911b12cSDag-Erling Smørgrav PAM_LOG("Got service: %s", (const char *)service); 14139384277SMark Murray 14239384277SMark Murray krbret = krb5_init_context(&pam_context); 14339384277SMark Murray if (krbret != 0) { 14439384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 14524fe7ba0SDag-Erling Smørgrav return (PAM_SERVICE_ERR); 14639384277SMark Murray } 14739384277SMark Murray 14839384277SMark Murray PAM_LOG("Context initialised"); 14939384277SMark Murray 15039384277SMark Murray krbret = krb5_cc_register(pam_context, &krb5_mcc_ops, FALSE); 15139384277SMark Murray if (krbret != 0 && krbret != KRB5_CC_TYPE_EXISTS) { 15239384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 15339384277SMark Murray retval = PAM_SERVICE_ERR; 15439384277SMark Murray goto cleanup3; 15539384277SMark Murray } 15639384277SMark Murray 15739384277SMark Murray PAM_LOG("Done krb5_cc_register()"); 15839384277SMark Murray 15939384277SMark Murray /* Get principal name */ 160545aa471SDag-Erling Smørgrav if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) 1614911b12cSDag-Erling Smørgrav asprintf(&principal, "%s/%s", (const char *)sourceuser, user); 16239384277SMark Murray else 16339384277SMark Murray principal = strdup(user); 16439384277SMark Murray 16539384277SMark Murray PAM_LOG("Created principal: %s", principal); 16639384277SMark Murray 16739384277SMark Murray krbret = krb5_parse_name(pam_context, principal, &princ); 16839384277SMark Murray free(principal); 16939384277SMark Murray if (krbret != 0) { 17026ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, "Error krb5_parse_name()"); 17139384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 17239384277SMark Murray retval = PAM_SERVICE_ERR; 17339384277SMark Murray goto cleanup3; 17439384277SMark Murray } 17539384277SMark Murray 17639384277SMark Murray PAM_LOG("Done krb5_parse_name()"); 17739384277SMark Murray 17839384277SMark Murray /* Now convert the principal name into something human readable */ 17939384277SMark Murray princ_name = NULL; 18039384277SMark Murray krbret = krb5_unparse_name(pam_context, princ, &princ_name); 18139384277SMark Murray if (krbret != 0) { 18226ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 18326ec46c8SStanislav Sedov "Error krb5_unparse_name()"); 18439384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 18539384277SMark Murray retval = PAM_SERVICE_ERR; 18639384277SMark Murray goto cleanup2; 18739384277SMark Murray } 18839384277SMark Murray 18939384277SMark Murray PAM_LOG("Got principal: %s", princ_name); 19039384277SMark Murray 19139384277SMark Murray /* Get password */ 192111ccd25SDag-Erling Smørgrav retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, PASSWORD_PROMPT); 19339384277SMark Murray if (retval != PAM_SUCCESS) 19439384277SMark Murray goto cleanup2; 19539384277SMark Murray 19639384277SMark Murray PAM_LOG("Got password"); 19739384277SMark Murray 198551e75c7SMartin Matuska if (openpam_get_option(pamh, PAM_OPT_NO_USER_CHECK)) 199551e75c7SMartin Matuska PAM_LOG("Skipping local user check"); 200551e75c7SMartin Matuska else { 201551e75c7SMartin Matuska 20239384277SMark Murray /* Verify the local user exists (AFTER getting the password) */ 20339384277SMark Murray if (strchr(user, '@')) { 20439384277SMark Murray /* get a local account name for this principal */ 20539384277SMark Murray krbret = krb5_aname_to_localname(pam_context, princ, 20639384277SMark Murray sizeof(luser), luser); 20739384277SMark Murray if (krbret != 0) { 20839384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 20926ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 21026ec46c8SStanislav Sedov "Error krb5_aname_to_localname()"); 21139384277SMark Murray retval = PAM_USER_UNKNOWN; 21239384277SMark Murray goto cleanup2; 21339384277SMark Murray } 21439384277SMark Murray 21539384277SMark Murray retval = pam_set_item(pamh, PAM_USER, luser); 21639384277SMark Murray if (retval != PAM_SUCCESS) 21739384277SMark Murray goto cleanup2; 21839384277SMark Murray 21939384277SMark Murray PAM_LOG("PAM_USER Redone"); 22039384277SMark Murray } 22139384277SMark Murray 22295748751SDoug Rabson if (!openpam_get_option(pamh, PAM_OPT_NO_USER_CHECK)) { 22339384277SMark Murray pwd = getpwnam(user); 22439384277SMark Murray if (pwd == NULL) { 22539384277SMark Murray retval = PAM_USER_UNKNOWN; 22639384277SMark Murray goto cleanup2; 22739384277SMark Murray } 22895748751SDoug Rabson } 22939384277SMark Murray 23039384277SMark Murray PAM_LOG("Done getpwnam()"); 231551e75c7SMartin Matuska } 23239384277SMark Murray 23326ec46c8SStanislav Sedov /* Initialize credentials request options. */ 23426ec46c8SStanislav Sedov krbret = krb5_get_init_creds_opt_alloc(pam_context, &opts); 23526ec46c8SStanislav Sedov if (krbret != 0) { 23626ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 23726ec46c8SStanislav Sedov "Error krb5_get_init_creds_opt_alloc()"); 23826ec46c8SStanislav Sedov PAM_VERBOSE_ERROR("Kerberos 5 error"); 23926ec46c8SStanislav Sedov retval = PAM_SERVICE_ERR; 24026ec46c8SStanislav Sedov goto cleanup2; 24126ec46c8SStanislav Sedov } 242886c5814SDag-Erling Smørgrav krb5_get_init_creds_opt_set_default_flags(pam_context, 243886c5814SDag-Erling Smørgrav service, NULL, opts); 24426ec46c8SStanislav Sedov 24526ec46c8SStanislav Sedov if (openpam_get_option(pamh, PAM_OPT_FORWARDABLE)) 24626ec46c8SStanislav Sedov krb5_get_init_creds_opt_set_forwardable(opts, 1); 24726ec46c8SStanislav Sedov 24826ec46c8SStanislav Sedov PAM_LOG("Credential options initialised"); 24926ec46c8SStanislav Sedov 25039384277SMark Murray /* Get a TGT */ 25139384277SMark Murray memset(&creds, 0, sizeof(krb5_creds)); 25239384277SMark Murray krbret = krb5_get_init_creds_password(pam_context, &creds, princ, 25326ec46c8SStanislav Sedov pass, NULL, pamh, 0, NULL, opts); 25426ec46c8SStanislav Sedov krb5_get_init_creds_opt_free(pam_context, opts); 25539384277SMark Murray if (krbret != 0) { 25639384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 25726ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 25826ec46c8SStanislav Sedov "Error krb5_get_init_creds_password()"); 25939384277SMark Murray retval = PAM_AUTH_ERR; 26039384277SMark Murray goto cleanup2; 26139384277SMark Murray } 26239384277SMark Murray 26339384277SMark Murray PAM_LOG("Got TGT"); 26439384277SMark Murray 2657c2274dcSJacques Vidrine /* Generate a temporary cache */ 26626ec46c8SStanislav Sedov krbret = krb5_cc_new_unique(pam_context, krb5_cc_type_memory, NULL, &ccache); 26739384277SMark Murray if (krbret != 0) { 26839384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 26926ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 27026ec46c8SStanislav Sedov "Error krb5_cc_new_unique()"); 27139384277SMark Murray retval = PAM_SERVICE_ERR; 27239384277SMark Murray goto cleanup; 27339384277SMark Murray } 27439384277SMark Murray krbret = krb5_cc_initialize(pam_context, ccache, princ); 27539384277SMark Murray if (krbret != 0) { 27639384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 27726ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 27826ec46c8SStanislav Sedov "Error krb5_cc_initialize()"); 27939384277SMark Murray retval = PAM_SERVICE_ERR; 28039384277SMark Murray goto cleanup; 28139384277SMark Murray } 28239384277SMark Murray krbret = krb5_cc_store_cred(pam_context, ccache, &creds); 28339384277SMark Murray if (krbret != 0) { 28439384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 28526ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 28626ec46c8SStanislav Sedov "Error krb5_cc_store_cred()"); 28739384277SMark Murray krb5_cc_destroy(pam_context, ccache); 28839384277SMark Murray retval = PAM_SERVICE_ERR; 28939384277SMark Murray goto cleanup; 29039384277SMark Murray } 29139384277SMark Murray 29239384277SMark Murray PAM_LOG("Credentials stashed"); 29339384277SMark Murray 29439384277SMark Murray /* Verify them */ 295111ccd25SDag-Erling Smørgrav if ((srvdup = strdup(service)) == NULL) { 296111ccd25SDag-Erling Smørgrav retval = PAM_BUF_ERR; 297111ccd25SDag-Erling Smørgrav goto cleanup; 298111ccd25SDag-Erling Smørgrav } 299111ccd25SDag-Erling Smørgrav krbret = verify_krb_v5_tgt(pam_context, ccache, srvdup, 30016417879SRobert Watson openpam_get_option(pamh, PAM_OPT_DEBUG) ? 1 : 0); 301111ccd25SDag-Erling Smørgrav free(srvdup); 302111ccd25SDag-Erling Smørgrav if (krbret == -1) { 30339384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 30439384277SMark Murray krb5_cc_destroy(pam_context, ccache); 30539384277SMark Murray retval = PAM_AUTH_ERR; 30639384277SMark Murray goto cleanup; 30739384277SMark Murray } 30839384277SMark Murray 30939384277SMark Murray PAM_LOG("Credentials stash verified"); 31039384277SMark Murray 311af9b4074SDag-Erling Smørgrav retval = pam_get_data(pamh, "ccache", &ccache_data); 31239384277SMark Murray if (retval == PAM_SUCCESS) { 31339384277SMark Murray krb5_cc_destroy(pam_context, ccache); 31439384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 31539384277SMark Murray retval = PAM_AUTH_ERR; 31639384277SMark Murray goto cleanup; 31739384277SMark Murray } 31839384277SMark Murray 31939384277SMark Murray PAM_LOG("Credentials stash not pre-existing"); 32039384277SMark Murray 3217c2274dcSJacques Vidrine asprintf(&ccache_name, "%s:%s", krb5_cc_get_type(pam_context, 3227c2274dcSJacques Vidrine ccache), krb5_cc_get_name(pam_context, ccache)); 3237c2274dcSJacques Vidrine if (ccache_name == NULL) { 3247c2274dcSJacques Vidrine PAM_VERBOSE_ERROR("Kerberos 5 error"); 3257c2274dcSJacques Vidrine retval = PAM_BUF_ERR; 3267c2274dcSJacques Vidrine goto cleanup; 3277c2274dcSJacques Vidrine } 3287c2274dcSJacques Vidrine retval = pam_set_data(pamh, "ccache", ccache_name, cleanup_cache); 32939384277SMark Murray if (retval != 0) { 33039384277SMark Murray krb5_cc_destroy(pam_context, ccache); 33139384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 33239384277SMark Murray retval = PAM_SERVICE_ERR; 33339384277SMark Murray goto cleanup; 33439384277SMark Murray } 33539384277SMark Murray 33639384277SMark Murray PAM_LOG("Credentials stash saved"); 33739384277SMark Murray 33839384277SMark Murray cleanup: 33939384277SMark Murray krb5_free_cred_contents(pam_context, &creds); 34039384277SMark Murray PAM_LOG("Done cleanup"); 34139384277SMark Murray cleanup2: 34239384277SMark Murray krb5_free_principal(pam_context, princ); 34339384277SMark Murray if (princ_name) 34439384277SMark Murray free(princ_name); 3452251b307SDimitry Andric PAM_LOG("Done cleanup2"); 34639384277SMark Murray 3472251b307SDimitry Andric cleanup3: 34839384277SMark Murray krb5_free_context(pam_context); 34939384277SMark Murray 35039384277SMark Murray PAM_LOG("Done cleanup3"); 35139384277SMark Murray 35239384277SMark Murray if (retval != PAM_SUCCESS) 35339384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 refuses you"); 35439384277SMark Murray 35524fe7ba0SDag-Erling Smørgrav return (retval); 35639384277SMark Murray } 35739384277SMark Murray 35839384277SMark Murray PAM_EXTERN int 35924fe7ba0SDag-Erling Smørgrav pam_sm_setcred(pam_handle_t *pamh, int flags, 360545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 36139384277SMark Murray { 3622672e717SKen Smith #ifdef _FREEFALL_CONFIG 3632672e717SKen Smith return (PAM_SUCCESS); 3642672e717SKen Smith #else 36539384277SMark Murray 36639384277SMark Murray krb5_error_code krbret; 36739384277SMark Murray krb5_context pam_context; 36839384277SMark Murray krb5_principal princ; 36939384277SMark Murray krb5_creds creds; 37039384277SMark Murray krb5_ccache ccache_temp, ccache_perm; 37139384277SMark Murray krb5_cc_cursor cursor; 37239384277SMark Murray struct passwd *pwd = NULL; 37339384277SMark Murray int retval; 3744911b12cSDag-Erling Smørgrav const char *cache_name, *q; 375af9b4074SDag-Erling Smørgrav const void *user; 37664dbe1a7SDag-Erling Smørgrav const void *cache_data; 377545aa471SDag-Erling Smørgrav char *cache_name_buf = NULL, *p; 37839384277SMark Murray 37939384277SMark Murray uid_t euid; 38039384277SMark Murray gid_t egid; 38139384277SMark Murray 38239384277SMark Murray if (flags & PAM_DELETE_CRED) 38324fe7ba0SDag-Erling Smørgrav return (PAM_SUCCESS); 38439384277SMark Murray 38539384277SMark Murray if (flags & PAM_REFRESH_CRED) 38624fe7ba0SDag-Erling Smørgrav return (PAM_SUCCESS); 38739384277SMark Murray 38839384277SMark Murray if (flags & PAM_REINITIALIZE_CRED) 38924fe7ba0SDag-Erling Smørgrav return (PAM_SUCCESS); 39039384277SMark Murray 39139384277SMark Murray if (!(flags & PAM_ESTABLISH_CRED)) 39224fe7ba0SDag-Erling Smørgrav return (PAM_SERVICE_ERR); 39339384277SMark Murray 394ed41980cSRobert Watson /* If a persistent cache isn't desired, stop now. */ 395551e75c7SMartin Matuska if (openpam_get_option(pamh, PAM_OPT_NO_CCACHE) || 396551e75c7SMartin Matuska openpam_get_option(pamh, PAM_OPT_NO_USER_CHECK)) 397ed41980cSRobert Watson return (PAM_SUCCESS); 398ed41980cSRobert Watson 39939384277SMark Murray PAM_LOG("Establishing credentials"); 40039384277SMark Murray 40139384277SMark Murray /* Get username */ 4024911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_USER, &user); 40339384277SMark Murray if (retval != PAM_SUCCESS) 40424fe7ba0SDag-Erling Smørgrav return (retval); 40539384277SMark Murray 4064911b12cSDag-Erling Smørgrav PAM_LOG("Got user: %s", (const char *)user); 40739384277SMark Murray 40839384277SMark Murray krbret = krb5_init_context(&pam_context); 40939384277SMark Murray if (krbret != 0) { 41088c8bcceSJacques Vidrine PAM_LOG("Error krb5_init_context() failed"); 41124fe7ba0SDag-Erling Smørgrav return (PAM_SERVICE_ERR); 41239384277SMark Murray } 41339384277SMark Murray 41439384277SMark Murray PAM_LOG("Context initialised"); 41539384277SMark Murray 41639384277SMark Murray euid = geteuid(); /* Usually 0 */ 41739384277SMark Murray egid = getegid(); 41839384277SMark Murray 41939384277SMark Murray PAM_LOG("Got euid, egid: %d %d", euid, egid); 42039384277SMark Murray 4217c2274dcSJacques Vidrine /* Retrieve the temporary cache */ 4224911b12cSDag-Erling Smørgrav retval = pam_get_data(pamh, "ccache", &cache_data); 4238f857e88SJacques Vidrine if (retval != PAM_SUCCESS) { 4248f857e88SJacques Vidrine retval = PAM_CRED_UNAVAIL; 42539384277SMark Murray goto cleanup3; 4268f857e88SJacques Vidrine } 4274911b12cSDag-Erling Smørgrav krbret = krb5_cc_resolve(pam_context, cache_data, &ccache_temp); 4287c2274dcSJacques Vidrine if (krbret != 0) { 42926ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 43026ec46c8SStanislav Sedov "Error krb5_cc_resolve(\"%s\")", (const char *)cache_data); 4318f857e88SJacques Vidrine retval = PAM_SERVICE_ERR; 4327c2274dcSJacques Vidrine goto cleanup3; 4337c2274dcSJacques Vidrine } 43439384277SMark Murray 43539384277SMark Murray /* Get the uid. This should exist. */ 43639384277SMark Murray pwd = getpwnam(user); 43739384277SMark Murray if (pwd == NULL) { 43839384277SMark Murray retval = PAM_USER_UNKNOWN; 43939384277SMark Murray goto cleanup3; 44039384277SMark Murray } 44139384277SMark Murray 44239384277SMark Murray PAM_LOG("Done getpwnam()"); 44339384277SMark Murray 44439384277SMark Murray /* Avoid following a symlink as root */ 44539384277SMark Murray if (setegid(pwd->pw_gid)) { 44639384277SMark Murray retval = PAM_SERVICE_ERR; 44739384277SMark Murray goto cleanup3; 44839384277SMark Murray } 44939384277SMark Murray if (seteuid(pwd->pw_uid)) { 45039384277SMark Murray retval = PAM_SERVICE_ERR; 45139384277SMark Murray goto cleanup3; 45239384277SMark Murray } 45339384277SMark Murray 45439384277SMark Murray PAM_LOG("Done setegid() & seteuid()"); 45539384277SMark Murray 45639384277SMark Murray /* Get the cache name */ 457545aa471SDag-Erling Smørgrav cache_name = openpam_get_option(pamh, PAM_OPT_CCACHE); 458545aa471SDag-Erling Smørgrav if (cache_name == NULL) { 459545aa471SDag-Erling Smørgrav asprintf(&cache_name_buf, "FILE:/tmp/krb5cc_%d", pwd->pw_uid); 460545aa471SDag-Erling Smørgrav cache_name = cache_name_buf; 461545aa471SDag-Erling Smørgrav } 46239384277SMark Murray 46339384277SMark Murray p = calloc(PATH_MAX + 16, sizeof(char)); 46439384277SMark Murray q = cache_name; 46539384277SMark Murray 46639384277SMark Murray if (p == NULL) { 46739384277SMark Murray PAM_LOG("Error malloc(): failure"); 46839384277SMark Murray retval = PAM_BUF_ERR; 46939384277SMark Murray goto cleanup3; 47039384277SMark Murray } 47139384277SMark Murray cache_name = p; 47239384277SMark Murray 47339384277SMark Murray /* convert %u and %p */ 47439384277SMark Murray while (*q) { 47539384277SMark Murray if (*q == '%') { 47639384277SMark Murray q++; 47739384277SMark Murray if (*q == 'u') { 47839384277SMark Murray sprintf(p, "%d", pwd->pw_uid); 47939384277SMark Murray p += strlen(p); 48039384277SMark Murray } 48139384277SMark Murray else if (*q == 'p') { 48239384277SMark Murray sprintf(p, "%d", getpid()); 48339384277SMark Murray p += strlen(p); 48439384277SMark Murray } 48539384277SMark Murray else { 48639384277SMark Murray /* Not a special token */ 48739384277SMark Murray *p++ = '%'; 48839384277SMark Murray q--; 48939384277SMark Murray } 49039384277SMark Murray q++; 49139384277SMark Murray } 49239384277SMark Murray else { 49339384277SMark Murray *p++ = *q++; 49439384277SMark Murray } 49539384277SMark Murray } 49639384277SMark Murray 49739384277SMark Murray PAM_LOG("Got cache_name: %s", cache_name); 49839384277SMark Murray 49939384277SMark Murray /* Initialize the new ccache */ 50039384277SMark Murray krbret = krb5_cc_get_principal(pam_context, ccache_temp, &princ); 50139384277SMark Murray if (krbret != 0) { 50226ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 50326ec46c8SStanislav Sedov "Error krb5_cc_get_principal()"); 50439384277SMark Murray retval = PAM_SERVICE_ERR; 50539384277SMark Murray goto cleanup3; 50639384277SMark Murray } 50739384277SMark Murray krbret = krb5_cc_resolve(pam_context, cache_name, &ccache_perm); 50839384277SMark Murray if (krbret != 0) { 50926ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, "Error krb5_cc_resolve()"); 51039384277SMark Murray retval = PAM_SERVICE_ERR; 51139384277SMark Murray goto cleanup2; 51239384277SMark Murray } 51339384277SMark Murray krbret = krb5_cc_initialize(pam_context, ccache_perm, princ); 51439384277SMark Murray if (krbret != 0) { 51526ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 51626ec46c8SStanislav Sedov "Error krb5_cc_initialize()"); 51739384277SMark Murray retval = PAM_SERVICE_ERR; 51839384277SMark Murray goto cleanup2; 51939384277SMark Murray } 52039384277SMark Murray 52139384277SMark Murray PAM_LOG("Cache initialised"); 52239384277SMark Murray 52339384277SMark Murray /* Prepare for iteration over creds */ 52439384277SMark Murray krbret = krb5_cc_start_seq_get(pam_context, ccache_temp, &cursor); 52539384277SMark Murray if (krbret != 0) { 52626ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 52726ec46c8SStanislav Sedov "Error krb5_cc_start_seq_get()"); 52839384277SMark Murray krb5_cc_destroy(pam_context, ccache_perm); 52939384277SMark Murray retval = PAM_SERVICE_ERR; 53039384277SMark Murray goto cleanup2; 53139384277SMark Murray } 53239384277SMark Murray 53339384277SMark Murray PAM_LOG("Prepared for iteration"); 53439384277SMark Murray 53539384277SMark Murray /* Copy the creds (should be two of them) */ 53639384277SMark Murray while ((krbret = krb5_cc_next_cred(pam_context, ccache_temp, 53739384277SMark Murray &cursor, &creds) == 0)) { 53839384277SMark Murray krbret = krb5_cc_store_cred(pam_context, ccache_perm, &creds); 53939384277SMark Murray if (krbret != 0) { 54026ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 54126ec46c8SStanislav Sedov "Error krb5_cc_store_cred()"); 54239384277SMark Murray krb5_cc_destroy(pam_context, ccache_perm); 54339384277SMark Murray krb5_free_cred_contents(pam_context, &creds); 54439384277SMark Murray retval = PAM_SERVICE_ERR; 54539384277SMark Murray goto cleanup2; 54639384277SMark Murray } 54739384277SMark Murray krb5_free_cred_contents(pam_context, &creds); 54839384277SMark Murray PAM_LOG("Iteration"); 54939384277SMark Murray } 55039384277SMark Murray krb5_cc_end_seq_get(pam_context, ccache_temp, &cursor); 55139384277SMark Murray 55239384277SMark Murray PAM_LOG("Done iterating"); 55339384277SMark Murray 55439384277SMark Murray if (strstr(cache_name, "FILE:") == cache_name) { 55539384277SMark Murray if (chown(&cache_name[5], pwd->pw_uid, pwd->pw_gid) == -1) { 55639384277SMark Murray PAM_LOG("Error chown(): %s", strerror(errno)); 55739384277SMark Murray krb5_cc_destroy(pam_context, ccache_perm); 55839384277SMark Murray retval = PAM_SERVICE_ERR; 55939384277SMark Murray goto cleanup2; 56039384277SMark Murray } 56139384277SMark Murray PAM_LOG("Done chown()"); 56239384277SMark Murray 56339384277SMark Murray if (chmod(&cache_name[5], (S_IRUSR | S_IWUSR)) == -1) { 56439384277SMark Murray PAM_LOG("Error chmod(): %s", strerror(errno)); 56539384277SMark Murray krb5_cc_destroy(pam_context, ccache_perm); 56639384277SMark Murray retval = PAM_SERVICE_ERR; 56739384277SMark Murray goto cleanup2; 56839384277SMark Murray } 56939384277SMark Murray PAM_LOG("Done chmod()"); 57039384277SMark Murray } 57139384277SMark Murray 57239384277SMark Murray krb5_cc_close(pam_context, ccache_perm); 57339384277SMark Murray 57439384277SMark Murray PAM_LOG("Cache closed"); 57539384277SMark Murray 576545aa471SDag-Erling Smørgrav retval = pam_setenv(pamh, "KRB5CCNAME", cache_name, 1); 577545aa471SDag-Erling Smørgrav if (retval != PAM_SUCCESS) { 578545aa471SDag-Erling Smørgrav PAM_LOG("Error pam_setenv(): %s", pam_strerror(pamh, retval)); 57939384277SMark Murray krb5_cc_destroy(pam_context, ccache_perm); 58039384277SMark Murray retval = PAM_SERVICE_ERR; 58139384277SMark Murray goto cleanup2; 58239384277SMark Murray } 58339384277SMark Murray 58439384277SMark Murray PAM_LOG("Environment done: KRB5CCNAME=%s", cache_name); 58539384277SMark Murray 58639384277SMark Murray cleanup2: 58739384277SMark Murray krb5_free_principal(pam_context, princ); 58839384277SMark Murray PAM_LOG("Done cleanup2"); 58939384277SMark Murray cleanup3: 59039384277SMark Murray krb5_free_context(pam_context); 59139384277SMark Murray PAM_LOG("Done cleanup3"); 59239384277SMark Murray 59339384277SMark Murray seteuid(euid); 59439384277SMark Murray setegid(egid); 59539384277SMark Murray 59639384277SMark Murray PAM_LOG("Done seteuid() & setegid()"); 59739384277SMark Murray 598545aa471SDag-Erling Smørgrav if (cache_name_buf != NULL) 599545aa471SDag-Erling Smørgrav free(cache_name_buf); 600545aa471SDag-Erling Smørgrav 60124fe7ba0SDag-Erling Smørgrav return (retval); 6022672e717SKen Smith #endif 60339384277SMark Murray } 60439384277SMark Murray 60539384277SMark Murray /* 60639384277SMark Murray * account management 60739384277SMark Murray */ 60839384277SMark Murray PAM_EXTERN int 60924fe7ba0SDag-Erling Smørgrav pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, 610545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 61139384277SMark Murray { 61239384277SMark Murray krb5_error_code krbret; 61339384277SMark Murray krb5_context pam_context; 61439384277SMark Murray krb5_ccache ccache; 61539384277SMark Murray krb5_principal princ; 61639384277SMark Murray int retval; 617af9b4074SDag-Erling Smørgrav const void *user; 61864dbe1a7SDag-Erling Smørgrav const void *ccache_name; 61939384277SMark Murray 6204911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_USER, &user); 62139384277SMark Murray if (retval != PAM_SUCCESS) 62224fe7ba0SDag-Erling Smørgrav return (retval); 62339384277SMark Murray 6244911b12cSDag-Erling Smørgrav PAM_LOG("Got user: %s", (const char *)user); 62539384277SMark Murray 6264911b12cSDag-Erling Smørgrav retval = pam_get_data(pamh, "ccache", &ccache_name); 6278dad14b1SDag-Erling Smørgrav if (retval != PAM_SUCCESS) 6288dad14b1SDag-Erling Smørgrav return (PAM_SUCCESS); 6298dad14b1SDag-Erling Smørgrav 6308dad14b1SDag-Erling Smørgrav PAM_LOG("Got credentials"); 6318dad14b1SDag-Erling Smørgrav 63239384277SMark Murray krbret = krb5_init_context(&pam_context); 63339384277SMark Murray if (krbret != 0) { 63488c8bcceSJacques Vidrine PAM_LOG("Error krb5_init_context() failed"); 63524fe7ba0SDag-Erling Smørgrav return (PAM_PERM_DENIED); 63639384277SMark Murray } 63739384277SMark Murray 63839384277SMark Murray PAM_LOG("Context initialised"); 63939384277SMark Murray 6404911b12cSDag-Erling Smørgrav krbret = krb5_cc_resolve(pam_context, (const char *)ccache_name, &ccache); 6417c2274dcSJacques Vidrine if (krbret != 0) { 64226ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 64326ec46c8SStanislav Sedov "Error krb5_cc_resolve(\"%s\")", (const char *)ccache_name); 6447c2274dcSJacques Vidrine krb5_free_context(pam_context); 6457c2274dcSJacques Vidrine return (PAM_PERM_DENIED); 6467c2274dcSJacques Vidrine } 6477c2274dcSJacques Vidrine 6484911b12cSDag-Erling Smørgrav PAM_LOG("Got ccache %s", (const char *)ccache_name); 6497c2274dcSJacques Vidrine 6507c2274dcSJacques Vidrine 65139384277SMark Murray krbret = krb5_cc_get_principal(pam_context, ccache, &princ); 65239384277SMark Murray if (krbret != 0) { 65326ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 65426ec46c8SStanislav Sedov "Error krb5_cc_get_principal()"); 655db702c59SEitan Adler retval = PAM_PERM_DENIED; 65639384277SMark Murray goto cleanup; 65739384277SMark Murray } 65839384277SMark Murray 65939384277SMark Murray PAM_LOG("Got principal"); 66039384277SMark Murray 6614911b12cSDag-Erling Smørgrav if (krb5_kuserok(pam_context, princ, (const char *)user)) 66239384277SMark Murray retval = PAM_SUCCESS; 66339384277SMark Murray else 66439384277SMark Murray retval = PAM_PERM_DENIED; 66539384277SMark Murray krb5_free_principal(pam_context, princ); 66639384277SMark Murray 66739384277SMark Murray PAM_LOG("Done kuserok()"); 66839384277SMark Murray 66939384277SMark Murray cleanup: 67039384277SMark Murray krb5_free_context(pam_context); 67139384277SMark Murray PAM_LOG("Done cleanup"); 67239384277SMark Murray 67324fe7ba0SDag-Erling Smørgrav return (retval); 67439384277SMark Murray 67539384277SMark Murray } 67639384277SMark Murray 67739384277SMark Murray /* 67839384277SMark Murray * password management 67939384277SMark Murray */ 68039384277SMark Murray PAM_EXTERN int 68124fe7ba0SDag-Erling Smørgrav pam_sm_chauthtok(pam_handle_t *pamh, int flags, 682545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 68339384277SMark Murray { 68439384277SMark Murray krb5_error_code krbret; 68539384277SMark Murray krb5_context pam_context; 68639384277SMark Murray krb5_creds creds; 68739384277SMark Murray krb5_principal princ; 68826ec46c8SStanislav Sedov krb5_get_init_creds_opt *opts; 68939384277SMark Murray krb5_data result_code_string, result_string; 69039384277SMark Murray int result_code, retval; 6914911b12cSDag-Erling Smørgrav const char *pass; 6924911b12cSDag-Erling Smørgrav const void *user; 693111ccd25SDag-Erling Smørgrav char *princ_name, *passdup; 69439384277SMark Murray 69539384277SMark Murray if (!(flags & PAM_UPDATE_AUTHTOK)) 69624fe7ba0SDag-Erling Smørgrav return (PAM_AUTHTOK_ERR); 69739384277SMark Murray 6984911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_USER, &user); 69939384277SMark Murray if (retval != PAM_SUCCESS) 70024fe7ba0SDag-Erling Smørgrav return (retval); 70139384277SMark Murray 7024911b12cSDag-Erling Smørgrav PAM_LOG("Got user: %s", (const char *)user); 70339384277SMark Murray 70439384277SMark Murray krbret = krb5_init_context(&pam_context); 70539384277SMark Murray if (krbret != 0) { 70688c8bcceSJacques Vidrine PAM_LOG("Error krb5_init_context() failed"); 70724fe7ba0SDag-Erling Smørgrav return (PAM_SERVICE_ERR); 70839384277SMark Murray } 70939384277SMark Murray 71039384277SMark Murray PAM_LOG("Context initialised"); 71139384277SMark Murray 71239384277SMark Murray /* Get principal name */ 7134911b12cSDag-Erling Smørgrav krbret = krb5_parse_name(pam_context, (const char *)user, &princ); 71439384277SMark Murray if (krbret != 0) { 71526ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 71626ec46c8SStanislav Sedov "Error krb5_parse_name()"); 71739384277SMark Murray retval = PAM_USER_UNKNOWN; 71839384277SMark Murray goto cleanup3; 71939384277SMark Murray } 72039384277SMark Murray 72139384277SMark Murray /* Now convert the principal name into something human readable */ 72239384277SMark Murray princ_name = NULL; 72339384277SMark Murray krbret = krb5_unparse_name(pam_context, princ, &princ_name); 72439384277SMark Murray if (krbret != 0) { 72526ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 72626ec46c8SStanislav Sedov "Error krb5_unparse_name()"); 72739384277SMark Murray retval = PAM_SERVICE_ERR; 72839384277SMark Murray goto cleanup2; 72939384277SMark Murray } 73039384277SMark Murray 73139384277SMark Murray PAM_LOG("Got principal: %s", princ_name); 73239384277SMark Murray 73339384277SMark Murray /* Get password */ 734111ccd25SDag-Erling Smørgrav retval = pam_get_authtok(pamh, PAM_OLDAUTHTOK, &pass, PASSWORD_PROMPT); 73539384277SMark Murray if (retval != PAM_SUCCESS) 73639384277SMark Murray goto cleanup2; 73739384277SMark Murray 73839384277SMark Murray PAM_LOG("Got password"); 73939384277SMark Murray 74026ec46c8SStanislav Sedov /* Initialize credentials request options. */ 74126ec46c8SStanislav Sedov krbret = krb5_get_init_creds_opt_alloc(pam_context, &opts); 74226ec46c8SStanislav Sedov if (krbret != 0) { 74326ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 74426ec46c8SStanislav Sedov "Error krb5_get_init_creds_opt_alloc()"); 74526ec46c8SStanislav Sedov PAM_VERBOSE_ERROR("Kerberos 5 error"); 74626ec46c8SStanislav Sedov retval = PAM_SERVICE_ERR; 74726ec46c8SStanislav Sedov goto cleanup2; 74826ec46c8SStanislav Sedov } 74926ec46c8SStanislav Sedov 75026ec46c8SStanislav Sedov PAM_LOG("Credentials options initialised"); 75126ec46c8SStanislav Sedov 75239384277SMark Murray memset(&creds, 0, sizeof(krb5_creds)); 75339384277SMark Murray krbret = krb5_get_init_creds_password(pam_context, &creds, princ, 75426ec46c8SStanislav Sedov pass, NULL, pamh, 0, "kadmin/changepw", opts); 75526ec46c8SStanislav Sedov krb5_get_init_creds_opt_free(pam_context, opts); 75639384277SMark Murray if (krbret != 0) { 75726ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 75826ec46c8SStanislav Sedov "Error krb5_get_init_creds_password()"); 75939384277SMark Murray retval = PAM_AUTH_ERR; 76039384277SMark Murray goto cleanup2; 76139384277SMark Murray } 76239384277SMark Murray 76339384277SMark Murray PAM_LOG("Credentials established"); 76439384277SMark Murray 76539384277SMark Murray /* Now get the new password */ 766111ccd25SDag-Erling Smørgrav for (;;) { 767111ccd25SDag-Erling Smørgrav retval = pam_get_authtok(pamh, 768111ccd25SDag-Erling Smørgrav PAM_AUTHTOK, &pass, NEW_PASSWORD_PROMPT); 769111ccd25SDag-Erling Smørgrav if (retval != PAM_TRY_AGAIN) 770111ccd25SDag-Erling Smørgrav break; 771111ccd25SDag-Erling Smørgrav pam_error(pamh, "Mismatch; try again, EOF to quit."); 77239384277SMark Murray } 773111ccd25SDag-Erling Smørgrav if (retval != PAM_SUCCESS) 774111ccd25SDag-Erling Smørgrav goto cleanup; 77539384277SMark Murray 776111ccd25SDag-Erling Smørgrav PAM_LOG("Got new password"); 77739384277SMark Murray 77839384277SMark Murray /* Change it */ 779111ccd25SDag-Erling Smørgrav if ((passdup = strdup(pass)) == NULL) { 780111ccd25SDag-Erling Smørgrav retval = PAM_BUF_ERR; 781111ccd25SDag-Erling Smørgrav goto cleanup; 782111ccd25SDag-Erling Smørgrav } 78326ec46c8SStanislav Sedov krbret = krb5_set_password(pam_context, &creds, passdup, NULL, 78439384277SMark Murray &result_code, &result_code_string, &result_string); 785111ccd25SDag-Erling Smørgrav free(passdup); 78639384277SMark Murray if (krbret != 0) { 78726ec46c8SStanislav Sedov PAM_LOG_KRB5_ERR(pam_context, krbret, 78826ec46c8SStanislav Sedov "Error krb5_change_password()"); 78939384277SMark Murray retval = PAM_AUTHTOK_ERR; 79039384277SMark Murray goto cleanup; 79139384277SMark Murray } 79239384277SMark Murray if (result_code) { 79339384277SMark Murray PAM_LOG("Error krb5_change_password(): (result_code)"); 79439384277SMark Murray retval = PAM_AUTHTOK_ERR; 79539384277SMark Murray goto cleanup; 79639384277SMark Murray } 79739384277SMark Murray 79839384277SMark Murray PAM_LOG("Password changed"); 79939384277SMark Murray 80039384277SMark Murray if (result_string.data) 80139384277SMark Murray free(result_string.data); 80239384277SMark Murray if (result_code_string.data) 80339384277SMark Murray free(result_code_string.data); 80439384277SMark Murray 80539384277SMark Murray cleanup: 80639384277SMark Murray krb5_free_cred_contents(pam_context, &creds); 80739384277SMark Murray PAM_LOG("Done cleanup"); 80839384277SMark Murray cleanup2: 80939384277SMark Murray krb5_free_principal(pam_context, princ); 81039384277SMark Murray if (princ_name) 81139384277SMark Murray free(princ_name); 8122251b307SDimitry Andric PAM_LOG("Done cleanup2"); 81339384277SMark Murray 8142251b307SDimitry Andric cleanup3: 81539384277SMark Murray krb5_free_context(pam_context); 81639384277SMark Murray 81739384277SMark Murray PAM_LOG("Done cleanup3"); 81839384277SMark Murray 81924fe7ba0SDag-Erling Smørgrav return (retval); 82039384277SMark Murray } 82139384277SMark Murray 82239384277SMark Murray PAM_MODULE_ENTRY("pam_krb5"); 82339384277SMark Murray 82439384277SMark Murray /* 82539384277SMark Murray * This routine with some modification is from the MIT V5B6 appl/bsd/login.c 82639384277SMark Murray * Modified by Sam Hartman <hartmans@mit.edu> to support PAM services 82739384277SMark Murray * for Debian. 82839384277SMark Murray * 82939384277SMark Murray * Verify the Kerberos ticket-granting ticket just retrieved for the 83039384277SMark Murray * user. If the Kerberos server doesn't respond, assume the user is 83139384277SMark Murray * trying to fake us out (since we DID just get a TGT from what is 83239384277SMark Murray * supposedly our KDC). If the host/<host> service is unknown (i.e., 83339384277SMark Murray * the local keytab doesn't have it), and we cannot find another 83439384277SMark Murray * service we do have, let her in. 83539384277SMark Murray * 83639384277SMark Murray * Returns 1 for confirmation, -1 for failure, 0 for uncertainty. 83739384277SMark Murray */ 838b4240e6cSMark Murray /* ARGSUSED */ 83939384277SMark Murray static int 84039384277SMark Murray verify_krb_v5_tgt(krb5_context context, krb5_ccache ccache, 84139384277SMark Murray char *pam_service, int debug) 84239384277SMark Murray { 84339384277SMark Murray krb5_error_code retval; 84439384277SMark Murray krb5_principal princ; 84539384277SMark Murray krb5_keyblock *keyblock; 84639384277SMark Murray krb5_data packet; 84739384277SMark Murray krb5_auth_context auth_context; 848c2065008SMark Murray char phost[BUFSIZ]; 849c2065008SMark Murray const char *services[3], **service; 85039384277SMark Murray 85139384277SMark Murray packet.data = 0; 85239384277SMark Murray 85339384277SMark Murray /* If possible we want to try and verify the ticket we have 85439384277SMark Murray * received against a keytab. We will try multiple service 85539384277SMark Murray * principals, including at least the host principal and the PAM 85639384277SMark Murray * service principal. The host principal is preferred because access 85739384277SMark Murray * to that key is generally sufficient to compromise root, while the 85839384277SMark Murray * service key for this PAM service may be less carefully guarded. 85939384277SMark Murray * It is important to check the keytab first before the KDC so we do 86039384277SMark Murray * not get spoofed by a fake KDC. 86139384277SMark Murray */ 86239384277SMark Murray services[0] = "host"; 86339384277SMark Murray services[1] = pam_service; 86439384277SMark Murray services[2] = NULL; 865d18146c2SPedro F. Giffuni keyblock = NULL; 86639384277SMark Murray retval = -1; 86739384277SMark Murray for (service = &services[0]; *service != NULL; service++) { 86839384277SMark Murray retval = krb5_sname_to_principal(context, NULL, *service, 86939384277SMark Murray KRB5_NT_SRV_HST, &princ); 87039384277SMark Murray if (retval != 0) { 87126ec46c8SStanislav Sedov if (debug) { 87226ec46c8SStanislav Sedov const char *msg = krb5_get_error_message( 87326ec46c8SStanislav Sedov context, retval); 87488c8bcceSJacques Vidrine syslog(LOG_DEBUG, 87588c8bcceSJacques Vidrine "pam_krb5: verify_krb_v5_tgt(): %s: %s", 87626ec46c8SStanislav Sedov "krb5_sname_to_principal()", msg); 87726ec46c8SStanislav Sedov krb5_free_error_message(context, msg); 87826ec46c8SStanislav Sedov } 87939384277SMark Murray return -1; 88039384277SMark Murray } 88139384277SMark Murray 88239384277SMark Murray /* Extract the name directly. */ 88339384277SMark Murray strncpy(phost, compat_princ_component(context, princ, 1), 88439384277SMark Murray BUFSIZ); 88539384277SMark Murray phost[BUFSIZ - 1] = '\0'; 88639384277SMark Murray 88739384277SMark Murray /* 88839384277SMark Murray * Do we have service/<host> keys? 88939384277SMark Murray * (use default/configured keytab, kvno IGNORE_VNO to get the 89039384277SMark Murray * first match, and ignore enctype.) 89139384277SMark Murray */ 89239384277SMark Murray retval = krb5_kt_read_service_key(context, NULL, princ, 0, 0, 89339384277SMark Murray &keyblock); 89439384277SMark Murray if (retval != 0) 89539384277SMark Murray continue; 89639384277SMark Murray break; 89739384277SMark Murray } 89839384277SMark Murray if (retval != 0) { /* failed to find key */ 89939384277SMark Murray /* Keytab or service key does not exist */ 90026ec46c8SStanislav Sedov if (debug) { 90126ec46c8SStanislav Sedov const char *msg = krb5_get_error_message(context, 90226ec46c8SStanislav Sedov retval); 90388c8bcceSJacques Vidrine syslog(LOG_DEBUG, 90488c8bcceSJacques Vidrine "pam_krb5: verify_krb_v5_tgt(): %s: %s", 90526ec46c8SStanislav Sedov "krb5_kt_read_service_key()", msg); 90626ec46c8SStanislav Sedov krb5_free_error_message(context, msg); 90726ec46c8SStanislav Sedov } 90839384277SMark Murray retval = 0; 90939384277SMark Murray goto cleanup; 91039384277SMark Murray } 91139384277SMark Murray if (keyblock) 91239384277SMark Murray krb5_free_keyblock(context, keyblock); 91339384277SMark Murray 91439384277SMark Murray /* Talk to the kdc and construct the ticket. */ 91539384277SMark Murray auth_context = NULL; 91639384277SMark Murray retval = krb5_mk_req(context, &auth_context, 0, *service, phost, 91739384277SMark Murray NULL, ccache, &packet); 91839384277SMark Murray if (auth_context) { 91939384277SMark Murray krb5_auth_con_free(context, auth_context); 92039384277SMark Murray auth_context = NULL; /* setup for rd_req */ 92139384277SMark Murray } 92239384277SMark Murray if (retval) { 92326ec46c8SStanislav Sedov if (debug) { 92426ec46c8SStanislav Sedov const char *msg = krb5_get_error_message(context, 92526ec46c8SStanislav Sedov retval); 92688c8bcceSJacques Vidrine syslog(LOG_DEBUG, 92788c8bcceSJacques Vidrine "pam_krb5: verify_krb_v5_tgt(): %s: %s", 92826ec46c8SStanislav Sedov "krb5_mk_req()", msg); 92926ec46c8SStanislav Sedov krb5_free_error_message(context, msg); 93026ec46c8SStanislav Sedov } 93139384277SMark Murray retval = -1; 93239384277SMark Murray goto cleanup; 93339384277SMark Murray } 93439384277SMark Murray 93539384277SMark Murray /* Try to use the ticket. */ 93639384277SMark Murray retval = krb5_rd_req(context, &auth_context, &packet, princ, NULL, 93739384277SMark Murray NULL, NULL); 93839384277SMark Murray if (retval) { 93926ec46c8SStanislav Sedov if (debug) { 94026ec46c8SStanislav Sedov const char *msg = krb5_get_error_message(context, 94126ec46c8SStanislav Sedov retval); 94288c8bcceSJacques Vidrine syslog(LOG_DEBUG, 94388c8bcceSJacques Vidrine "pam_krb5: verify_krb_v5_tgt(): %s: %s", 94426ec46c8SStanislav Sedov "krb5_rd_req()", msg); 94526ec46c8SStanislav Sedov krb5_free_error_message(context, msg); 94626ec46c8SStanislav Sedov } 94739384277SMark Murray retval = -1; 94839384277SMark Murray } 94939384277SMark Murray else 95039384277SMark Murray retval = 1; 95139384277SMark Murray 95239384277SMark Murray cleanup: 95339384277SMark Murray if (packet.data) 95439384277SMark Murray compat_free_data_contents(context, &packet); 95539384277SMark Murray krb5_free_principal(context, princ); 95639384277SMark Murray return retval; 95739384277SMark Murray } 95839384277SMark Murray 95939384277SMark Murray /* Free the memory for cache_name. Called by pam_end() */ 960b4240e6cSMark Murray /* ARGSUSED */ 96139384277SMark Murray static void 962c2065008SMark Murray cleanup_cache(pam_handle_t *pamh __unused, void *data, int pam_end_status __unused) 96339384277SMark Murray { 96439384277SMark Murray krb5_context pam_context; 96539384277SMark Murray krb5_ccache ccache; 9667c2274dcSJacques Vidrine krb5_error_code krbret; 96739384277SMark Murray 96839384277SMark Murray if (krb5_init_context(&pam_context)) 96939384277SMark Murray return; 97039384277SMark Murray 9717c2274dcSJacques Vidrine krbret = krb5_cc_resolve(pam_context, data, &ccache); 9727c2274dcSJacques Vidrine if (krbret == 0) 97339384277SMark Murray krb5_cc_destroy(pam_context, ccache); 97439384277SMark Murray krb5_free_context(pam_context); 9757c2274dcSJacques Vidrine free(data); 97639384277SMark Murray } 97739384277SMark Murray 97839384277SMark Murray #ifdef COMPAT_HEIMDAL 97939384277SMark Murray #ifdef COMPAT_MIT 98039384277SMark Murray #error This cannot be MIT and Heimdal compatible! 98139384277SMark Murray #endif 98239384277SMark Murray #endif 98339384277SMark Murray 98439384277SMark Murray #ifndef COMPAT_HEIMDAL 98539384277SMark Murray #ifndef COMPAT_MIT 98639384277SMark Murray #error One of COMPAT_MIT and COMPAT_HEIMDAL must be specified! 98739384277SMark Murray #endif 98839384277SMark Murray #endif 98939384277SMark Murray 99039384277SMark Murray #ifdef COMPAT_HEIMDAL 991b4240e6cSMark Murray /* ARGSUSED */ 99239384277SMark Murray static const char * 993c2065008SMark Murray compat_princ_component(krb5_context context __unused, krb5_principal princ, int n) 99439384277SMark Murray { 99539384277SMark Murray return princ->name.name_string.val[n]; 99639384277SMark Murray } 99739384277SMark Murray 998b4240e6cSMark Murray /* ARGSUSED */ 99939384277SMark Murray static void 1000c2065008SMark Murray compat_free_data_contents(krb5_context context __unused, krb5_data * data) 100139384277SMark Murray { 100239384277SMark Murray krb5_xfree(data->data); 100339384277SMark Murray } 100439384277SMark Murray #endif 100539384277SMark Murray 100639384277SMark Murray #ifdef COMPAT_MIT 100739384277SMark Murray static const char * 100839384277SMark Murray compat_princ_component(krb5_context context, krb5_principal princ, int n) 100939384277SMark Murray { 101039384277SMark Murray return krb5_princ_component(context, princ, n)->data; 101139384277SMark Murray } 101239384277SMark Murray 101339384277SMark Murray static void 101439384277SMark Murray compat_free_data_contents(krb5_context context, krb5_data * data) 101539384277SMark Murray { 101639384277SMark Murray krb5_free_data_contents(context, data); 101739384277SMark Murray } 101839384277SMark Murray #endif 1019