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GC pam_krb5 and pam_ksu.

These haven't been built since 2009, and pam_krb5 is available in
pkgsrc if someone needs it.
  • Loading branch information...
commit b9ab0360a28e6f144e0b1dc6286b8c0b1c7f3cfc 1 parent b227436
Peter Avalos authored
View
11 lib/pam_module/pam_krb5/Makefile
@@ -1,11 +0,0 @@
-# $DragonFly: src/lib/pam_module/pam_krb5/Makefile,v 1.3 2005/07/28 19:25:41 joerg Exp $
-
-LIB= pam_krb5
-SRCS= pam_krb5.c
-MAN= pam_krb5.8
-
-DPADD= ${LIBKRB5} ${LIBGSSAPI} ${LIBASN1} ${LIBCRYPTO} ${LIBCRYPT} \
- ${LIBCOM_ERR} ${LIBROKEN}
-LDADD= -lkrb5 -lgssapi -lasn1 -lcrypto -lcrypt -lcom_err -lroken
-
-.include <bsd.lib.mk>
View
218 lib/pam_module/pam_krb5/pam_krb5.8
@@ -1,218 +0,0 @@
-.\"
-.\" $Id: pam_krb5.5,v 1.5 2000/01/05 00:59:56 fcusack Exp $
-.\" $FreeBSD: src/lib/libpam/modules/pam_krb5/pam_krb5.8,v 1.6 2001/11/24 23:41:32 dd Exp $
-.\" $DragonFly: src/lib/pam_module/pam_krb5/pam_krb5.8,v 1.1 2005/07/12 23:04:02 joerg Exp $
-.Dd January 15, 1999
-.Dt PAM_KRB5 8
-.Os
-.Sh NAME
-.Nm pam_krb5
-.Nd Kerberos 5 PAM module
-.Sh SYNOPSIS
-.Pa /usr/lib/pam_krb5.so
-.Sh DESCRIPTION
-The Kerberos 5 service module for PAM, typically
-.Pa /usr/lib/pam_krb5.so ,
-provides functionality for three PAM categories:
-authentication,
-account management,
-and password management.
-It also provides null functions for session management.
-The
-.Pa pam_krb5.so
-module is a shared object
-that can be dynamically loaded to provide
-the necessary functionality upon demand.
-Its path is specified in the
-PAM configuration file.
-.Ss Kerberos 5 Authentication Module
-The Kerberos 5 authentication component
-provides functions to verify the identity of a user
-.Pq Fn pam_sm_authenticate
-and to set user specific credentials
-.Pq Fn pam_sm_setcred .
-.Fn pam_sm_authenticate
-converts the supplied username into a Kerberos principal,
-by appending the default local realm name.
-It also supports usernames with explicit realm names.
-If a realm name is supplied, then upon a successful return, it
-changes the username by mapping the principal name into a local username
-(calling
-.Fn krb5_aname_to_localname ) .
-This typically just means
-the realm name is stripped.
-.Pp
-It prompts the user for a password and obtains a new Kerberos TGT for
-the principal.
-The TGT is verified by obtaining a service
-ticket for the local host.
-.Pp
-When prompting for the current password, the authentication
-module will use the prompt
-.Dq Li "Password for <principal>:" .
-.Pp
-The
-.Fn pam_sm_setcred
-function stores the newly acquired credentials in a credentials cache,
-and sets the environment variable
-.Ev KRB5CCNAME
-appropriately.
-The credentials cache should be destroyed by the user at logout with
-.Xr kdestroy 1 .
-.Pp
-The following options may be passed to the authentication module:
-.Bl -tag -width ".Cm use_first_pass"
-.It Cm debug
-.Xr syslog 3
-debugging information at
-.Dv LOG_DEBUG
-level.
-.It Cm no_warn
-suppress warning messages to the user.
-These messages include
-reasons why the user's
-authentication attempt was declined.
-.It Cm use_first_pass
-If the authentication module is not the first in the stack,
-and a previous module obtained the user's password, that password is
-used to authenticate the user.
-If this fails, the authentication
-module returns failure without prompting the user for a password.
-This option has no effect if the authentication module is
-the first in the stack, or if no previous modules obtained the
-user's password.
-.It Cm try_first_pass
-This option is similar to the
-.Cm use_first_pass
-option, except that if the previously obtained password fails, the
-user is prompted for another password.
-.It Cm forwardable
-Obtain forwardable Kerberos credentials for the user.
-.It Cm no_ccache
-Do not save the obtained credentials in a credentials cache.
-This is a
-useful option if the authentication module is used for services such
-as ftp or pop, where the user would not be able to destroy them.
-[This
-is not a recommendation to use the module for those services.]
-.It Cm ccache Ns = Ns Ar name
-Use
-.Ar name
-as the credentials cache.
-.Ar name
-must be in the form
-.Ar type : Ns Ar residual .
-The special tokens
-.Ql %u ,
-to designate the decimal UID of the user;
-and
-.Ql %p ,
-to designate the current process ID; can be used in
-.Ar name .
-.El
-.Ss Kerberos 5 Account Management Module
-The Kerberos 5 account management component
-provides a function to perform account management,
-.Fn pam_sm_acct_mgmt .
-The function verifies that the authenticated principal is allowed
-to login to the local user account by calling
-.Fn krb5_kuserok
-(which checks the user's
-.Pa .k5login
-file).
-.Ss Kerberos 5 Password Management Module
-The Kerberos 5 password management component
-provides a function to change passwords
-.Pq Fn pam_sm_chauthtok .
-The username supplied (the
-user running the
-.Xr passwd 1
-command, or the username given as an argument) is mapped into
-a Kerberos principal name, using the same technique as in
-the authentication module.
-Note that if a realm name was
-explicitly supplied during authentication, but not during
-a password change, the mapping
-done by the password management module may not result in the
-same principal as was used for authentication.
-.Pp
-Unlike when
-changing a
-.Ux
-password, the password management module will
-allow any user to change any principal's password (if the user knows
-the principal's old password, of course).
-Also unlike
-.Ux ,
-root
-is always prompted for the principal's old password.
-.Pp
-The password management module uses the same heuristics as
-.Xr kpasswd 1
-to determine how to contact the Kerberos password server.
-.Pp
-The following options may be passed to the password management
-module:
-.Bl -tag -width ".Cm use_first_pass"
-.It Cm debug
-.Xr syslog 3
-debugging information at
-.Dv LOG_DEBUG
-level.
-.It Cm use_first_pass
-If the password management module is not the first in the stack,
-and a previous module obtained the user's old password, that password is
-used to authenticate the user.
-If this fails, the password
-management
-module returns failure without prompting the user for the old password.
-If successful, the new password entered to the previous module is also
-used as the new Kerberos password.
-If the new password fails,
-the password management module returns failure without
-prompting the user for a new password.
-.It Cm try_first_pass
-This option is similar to the
-.Cm use_first_pass
-option, except that if the previously obtained old or new passwords fail,
-the user is prompted for them.
-.El
-.Ss Kerberos 5 Session Management Module
-The Kerberos 5 session management component
-provides functions to initiate
-.Pq Fn pam_sm_open_session
-and terminate
-.Pq Fn pam_sm_close_session
-sessions.
-Since session management is not defined under Kerberos 5,
-both of these functions simply return success.
-They are provided
-only because of the naming conventions for PAM modules.
-.Sh ENVIRONMENT
-.Bl -tag -width "KRB5CCNAME"
-.It Ev KRB5CCNAME
-Location of the credentials cache.
-.El
-.Sh FILES
-.Bl -tag -width ".Pa /tmp/krb5cc_ Ns Ar uid" -compact
-.It Pa /tmp/krb5cc_ Ns Ar uid
-default credentials cache
-.Ar ( uid
-is the decimal UID of the user).
-.It Pa $HOME/.k5login
-file containing Kerberos principals that are allowed access.
-.El
-.Sh SEE ALSO
-.Xr kdestroy 1 ,
-.Xr passwd 1 ,
-.Xr syslog 3 ,
-.Xr pam.conf 5 ,
-.Xr pam 8
-.Sh NOTES
-Applications should not call
-.Fn pam_authenticate
-more than once between calls to
-.Fn pam_start
-and
-.Fn pam_end
-when using the Kerberos 5 PAM module.
View
970 lib/pam_module/pam_krb5/pam_krb5.c
@@ -1,970 +0,0 @@
-/*-
- * This pam_krb5 module contains code that is:
- * Copyright (c) Derrick J. Brashear, 1996. All rights reserved.
- * Copyright (c) Frank Cusack, 1999-2001. All rights reserved.
- * Copyright (c) Jacques A. Vidrine, 2000-2001. All rights reserved.
- * Copyright (c) Nicolas Williams, 2001. All rights reserved.
- * Copyright (c) Perot Systems Corporation, 2001. All rights reserved.
- * Copyright (c) Mark R V Murray, 2001. All rights reserved.
- * Copyright (c) Networks Associates Technology, Inc., 2002-2005.
- * All rights reserved.
- *
- * Portions of this software were developed for the FreeBSD Project by
- * ThinkSec AS and NAI Labs, the Security Research Division of Network
- * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
- * ("CBOSS"), as part of the DARPA CHATS research program.
- *
- * 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
- * notices, and the entire permission notice in its entirety,
- * including the disclaimer of warranties.
- * 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. The name of the author may not be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * ALTERNATIVELY, this product may be distributed under the terms of
- * the GNU Public License, in which case the provisions of the GPL are
- * required INSTEAD OF the above restrictions. (This clause is
- * necessary due to a potential bad interaction between the GPL and
- * the restrictions contained in a BSD-style copyright.)
- *
- * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
- *
- * $FreeBSD: src/lib/libpam/modules/pam_krb5/pam_krb5.c,v 1.23 2005/07/07 14:16:38 kensmith Exp $
- * $DragonFly: src/lib/pam_module/pam_krb5/pam_krb5.c,v 1.2 2006/08/03 16:40:46 swildner Exp $
- */
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <errno.h>
-#include <limits.h>
-#include <pwd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <unistd.h>
-
-#include <krb5.h>
-#include <com_err.h>
-
-#define PAM_SM_AUTH
-#define PAM_SM_ACCOUNT
-#define PAM_SM_PASSWORD
-
-#include <security/pam_appl.h>
-#include <security/pam_modules.h>
-#include <security/pam_mod_misc.h>
-#include <security/openpam.h>
-
-#define COMPAT_HEIMDAL
-/* #define COMPAT_MIT */
-
-static int verify_krb_v5_tgt(krb5_context, krb5_ccache, char *, int);
-static void cleanup_cache(pam_handle_t *, void *, int);
-static const char *compat_princ_component(krb5_context, krb5_principal, int);
-static void compat_free_data_contents(krb5_context, krb5_data *);
-
-#define USER_PROMPT "Username: "
-#define PASSWORD_PROMPT "Password:"
-#define NEW_PASSWORD_PROMPT "New Password:"
-
-#define PAM_OPT_CCACHE "ccache"
-#define PAM_OPT_DEBUG "debug"
-#define PAM_OPT_FORWARDABLE "forwardable"
-#define PAM_OPT_NO_CCACHE "no_ccache"
-#define PAM_OPT_REUSE_CCACHE "reuse_ccache"
-
-/*
- * authentication management
- */
-PAM_EXTERN int
-pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
- int argc __unused, const char *argv[] __unused)
-{
- krb5_error_code krbret;
- krb5_context pam_context;
- krb5_creds creds;
- krb5_principal princ;
- krb5_ccache ccache;
- krb5_get_init_creds_opt opts;
- struct passwd *pwd;
- int retval;
- const void *ccache_data;
- const char *user, *pass;
- const void *sourceuser, *service;
- char *principal, *princ_name, *ccache_name, luser[32], *srvdup;
-
- retval = pam_get_user(pamh, &user, USER_PROMPT);
- if (retval != PAM_SUCCESS)
- return (retval);
-
- PAM_LOG("Got user: %s", user);
-
- retval = pam_get_item(pamh, PAM_RUSER, &sourceuser);
- if (retval != PAM_SUCCESS)
- return (retval);
-
- PAM_LOG("Got ruser: %s", (const char *)sourceuser);
-
- service = NULL;
- pam_get_item(pamh, PAM_SERVICE, &service);
- if (service == NULL)
- service = "unknown";
-
- PAM_LOG("Got service: %s", (const char *)service);
-
- krbret = krb5_init_context(&pam_context);
- if (krbret != 0) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- return (PAM_SERVICE_ERR);
- }
-
- PAM_LOG("Context initialised");
-
- krb5_get_init_creds_opt_init(&opts);
-
- if (openpam_get_option(pamh, PAM_OPT_FORWARDABLE))
- krb5_get_init_creds_opt_set_forwardable(&opts, 1);
-
- PAM_LOG("Credentials initialised");
-
- krbret = krb5_cc_register(pam_context, &krb5_mcc_ops, FALSE);
- if (krbret != 0 && krbret != KRB5_CC_TYPE_EXISTS) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- retval = PAM_SERVICE_ERR;
- goto cleanup3;
- }
-
- PAM_LOG("Done krb5_cc_register()");
-
- /* Get principal name */
- if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF))
- asprintf(&principal, "%s/%s", (const char *)sourceuser, user);
- else
- principal = strdup(user);
-
- PAM_LOG("Created principal: %s", principal);
-
- krbret = krb5_parse_name(pam_context, principal, &princ);
- free(principal);
- if (krbret != 0) {
- PAM_LOG("Error krb5_parse_name(): %s",
- krb5_get_err_text(pam_context, krbret));
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- retval = PAM_SERVICE_ERR;
- goto cleanup3;
- }
-
- PAM_LOG("Done krb5_parse_name()");
-
- /* Now convert the principal name into something human readable */
- princ_name = NULL;
- krbret = krb5_unparse_name(pam_context, princ, &princ_name);
- if (krbret != 0) {
- PAM_LOG("Error krb5_unparse_name(): %s",
- krb5_get_err_text(pam_context, krbret));
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
-
- PAM_LOG("Got principal: %s", princ_name);
-
- /* Get password */
- retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, PASSWORD_PROMPT);
- if (retval != PAM_SUCCESS)
- goto cleanup2;
-
- PAM_LOG("Got password");
-
- /* Verify the local user exists (AFTER getting the password) */
- if (strchr(user, '@')) {
- /* get a local account name for this principal */
- krbret = krb5_aname_to_localname(pam_context, princ,
- sizeof(luser), luser);
- if (krbret != 0) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- PAM_LOG("Error krb5_aname_to_localname(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_USER_UNKNOWN;
- goto cleanup2;
- }
-
- retval = pam_set_item(pamh, PAM_USER, luser);
- if (retval != PAM_SUCCESS)
- goto cleanup2;
-
- PAM_LOG("PAM_USER Redone");
- }
-
- pwd = getpwnam(user);
- if (pwd == NULL) {
- retval = PAM_USER_UNKNOWN;
- goto cleanup2;
- }
-
- PAM_LOG("Done getpwnam()");
-
- /* Get a TGT */
- memset(&creds, 0, sizeof(krb5_creds));
- krbret = krb5_get_init_creds_password(pam_context, &creds, princ,
- pass, NULL, pamh, 0, NULL, &opts);
- if (krbret != 0) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- PAM_LOG("Error krb5_get_init_creds_password(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_AUTH_ERR;
- goto cleanup2;
- }
-
- PAM_LOG("Got TGT");
-
- /* Generate a temporary cache */
- krbret = krb5_cc_gen_new(pam_context, &krb5_mcc_ops, &ccache);
- if (krbret != 0) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- PAM_LOG("Error krb5_cc_gen_new(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_SERVICE_ERR;
- goto cleanup;
- }
- krbret = krb5_cc_initialize(pam_context, ccache, princ);
- if (krbret != 0) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- PAM_LOG("Error krb5_cc_initialize(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_SERVICE_ERR;
- goto cleanup;
- }
- krbret = krb5_cc_store_cred(pam_context, ccache, &creds);
- if (krbret != 0) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- PAM_LOG("Error krb5_cc_store_cred(): %s",
- krb5_get_err_text(pam_context, krbret));
- krb5_cc_destroy(pam_context, ccache);
- retval = PAM_SERVICE_ERR;
- goto cleanup;
- }
-
- PAM_LOG("Credentials stashed");
-
- /* Verify them */
- if ((srvdup = strdup(service)) == NULL) {
- retval = PAM_BUF_ERR;
- goto cleanup;
- }
- krbret = verify_krb_v5_tgt(pam_context, ccache, srvdup,
- openpam_get_option(pamh, PAM_OPT_DEBUG) ? 1 : 0);
- free(srvdup);
- if (krbret == -1) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- krb5_cc_destroy(pam_context, ccache);
- retval = PAM_AUTH_ERR;
- goto cleanup;
- }
-
- PAM_LOG("Credentials stash verified");
-
- retval = pam_get_data(pamh, "ccache", &ccache_data);
- if (retval == PAM_SUCCESS) {
- krb5_cc_destroy(pam_context, ccache);
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- retval = PAM_AUTH_ERR;
- goto cleanup;
- }
-
- PAM_LOG("Credentials stash not pre-existing");
-
- asprintf(&ccache_name, "%s:%s", krb5_cc_get_type(pam_context,
- ccache), krb5_cc_get_name(pam_context, ccache));
- if (ccache_name == NULL) {
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- retval = PAM_BUF_ERR;
- goto cleanup;
- }
- retval = pam_set_data(pamh, "ccache", ccache_name, cleanup_cache);
- if (retval != 0) {
- krb5_cc_destroy(pam_context, ccache);
- PAM_VERBOSE_ERROR("Kerberos 5 error");
- retval = PAM_SERVICE_ERR;
- goto cleanup;
- }
-
- PAM_LOG("Credentials stash saved");
-
-cleanup:
- krb5_free_cred_contents(pam_context, &creds);
- PAM_LOG("Done cleanup");
-cleanup2:
- krb5_free_principal(pam_context, princ);
- PAM_LOG("Done cleanup2");
-cleanup3:
- if (princ_name)
- free(princ_name);
-
- krb5_free_context(pam_context);
-
- PAM_LOG("Done cleanup3");
-
- if (retval != PAM_SUCCESS)
- PAM_VERBOSE_ERROR("Kerberos 5 refuses you");
-
- return (retval);
-}
-
-PAM_EXTERN int
-pam_sm_setcred(pam_handle_t *pamh, int flags,
- int argc __unused, const char *argv[] __unused)
-{
-#ifdef _FREEFALL_CONFIG
- return (PAM_SUCCESS);
-#else
-
- krb5_error_code krbret;
- krb5_context pam_context;
- krb5_principal princ;
- krb5_creds creds;
- krb5_ccache ccache_temp, ccache_perm;
- krb5_cc_cursor cursor;
- struct passwd *pwd = NULL;
- int retval;
- const char *cache_name, *q;
- const void *user;
- const void *cache_data;
- char *cache_name_buf = NULL, *p;
-
- uid_t euid;
- gid_t egid;
-
- if (flags & PAM_DELETE_CRED)
- return (PAM_SUCCESS);
-
- if (flags & PAM_REFRESH_CRED)
- return (PAM_SUCCESS);
-
- if (flags & PAM_REINITIALIZE_CRED)
- return (PAM_SUCCESS);
-
- if (!(flags & PAM_ESTABLISH_CRED))
- return (PAM_SERVICE_ERR);
-
- /* If a persistent cache isn't desired, stop now. */
- if (openpam_get_option(pamh, PAM_OPT_NO_CCACHE))
- return (PAM_SUCCESS);
-
- PAM_LOG("Establishing credentials");
-
- /* Get username */
- retval = pam_get_item(pamh, PAM_USER, &user);
- if (retval != PAM_SUCCESS)
- return (retval);
-
- PAM_LOG("Got user: %s", (const char *)user);
-
- krbret = krb5_init_context(&pam_context);
- if (krbret != 0) {
- PAM_LOG("Error krb5_init_context() failed");
- return (PAM_SERVICE_ERR);
- }
-
- PAM_LOG("Context initialised");
-
- euid = geteuid(); /* Usually 0 */
- egid = getegid();
-
- PAM_LOG("Got euid, egid: %d %d", euid, egid);
-
- /* Retrieve the temporary cache */
- retval = pam_get_data(pamh, "ccache", &cache_data);
- if (retval != PAM_SUCCESS) {
- retval = PAM_CRED_UNAVAIL;
- goto cleanup3;
- }
- krbret = krb5_cc_resolve(pam_context, cache_data, &ccache_temp);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_resolve(\"%s\"): %s", (const char *)cache_data,
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_SERVICE_ERR;
- goto cleanup3;
- }
-
- /* Get the uid. This should exist. */
- pwd = getpwnam(user);
- if (pwd == NULL) {
- retval = PAM_USER_UNKNOWN;
- goto cleanup3;
- }
-
- PAM_LOG("Done getpwnam()");
-
- /* Avoid following a symlink as root */
- if (setegid(pwd->pw_gid)) {
- retval = PAM_SERVICE_ERR;
- goto cleanup3;
- }
- if (seteuid(pwd->pw_uid)) {
- retval = PAM_SERVICE_ERR;
- goto cleanup3;
- }
-
- PAM_LOG("Done setegid() & seteuid()");
-
- /* Get the cache name */
- cache_name = openpam_get_option(pamh, PAM_OPT_CCACHE);
- if (cache_name == NULL) {
- asprintf(&cache_name_buf, "FILE:/tmp/krb5cc_%d", pwd->pw_uid);
- cache_name = cache_name_buf;
- }
-
- p = calloc(PATH_MAX + 16, sizeof(char));
- q = cache_name;
-
- if (p == NULL) {
- PAM_LOG("Error malloc(): failure");
- retval = PAM_BUF_ERR;
- goto cleanup3;
- }
- cache_name = p;
-
- /* convert %u and %p */
- while (*q) {
- if (*q == '%') {
- q++;
- if (*q == 'u') {
- sprintf(p, "%d", pwd->pw_uid);
- p += strlen(p);
- }
- else if (*q == 'p') {
- sprintf(p, "%d", getpid());
- p += strlen(p);
- }
- else {
- /* Not a special token */
- *p++ = '%';
- q--;
- }
- q++;
- }
- else {
- *p++ = *q++;
- }
- }
-
- PAM_LOG("Got cache_name: %s", cache_name);
-
- /* Initialize the new ccache */
- krbret = krb5_cc_get_principal(pam_context, ccache_temp, &princ);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_get_principal(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_SERVICE_ERR;
- goto cleanup3;
- }
- krbret = krb5_cc_resolve(pam_context, cache_name, &ccache_perm);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_resolve(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
- krbret = krb5_cc_initialize(pam_context, ccache_perm, princ);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_initialize(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
-
- PAM_LOG("Cache initialised");
-
- /* Prepare for iteration over creds */
- krbret = krb5_cc_start_seq_get(pam_context, ccache_temp, &cursor);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_start_seq_get(): %s",
- krb5_get_err_text(pam_context, krbret));
- krb5_cc_destroy(pam_context, ccache_perm);
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
-
- PAM_LOG("Prepared for iteration");
-
- /* Copy the creds (should be two of them) */
- while ((krbret = krb5_cc_next_cred(pam_context, ccache_temp,
- &cursor, &creds) == 0)) {
- krbret = krb5_cc_store_cred(pam_context, ccache_perm, &creds);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_store_cred(): %s",
- krb5_get_err_text(pam_context, krbret));
- krb5_cc_destroy(pam_context, ccache_perm);
- krb5_free_cred_contents(pam_context, &creds);
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
- krb5_free_cred_contents(pam_context, &creds);
- PAM_LOG("Iteration");
- }
- krb5_cc_end_seq_get(pam_context, ccache_temp, &cursor);
-
- PAM_LOG("Done iterating");
-
- if (strstr(cache_name, "FILE:") == cache_name) {
- if (chown(&cache_name[5], pwd->pw_uid, pwd->pw_gid) == -1) {
- PAM_LOG("Error chown(): %s", strerror(errno));
- krb5_cc_destroy(pam_context, ccache_perm);
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
- PAM_LOG("Done chown()");
-
- if (chmod(&cache_name[5], (S_IRUSR | S_IWUSR)) == -1) {
- PAM_LOG("Error chmod(): %s", strerror(errno));
- krb5_cc_destroy(pam_context, ccache_perm);
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
- PAM_LOG("Done chmod()");
- }
-
- krb5_cc_close(pam_context, ccache_perm);
-
- PAM_LOG("Cache closed");
-
- retval = pam_setenv(pamh, "KRB5CCNAME", cache_name, 1);
- if (retval != PAM_SUCCESS) {
- PAM_LOG("Error pam_setenv(): %s", pam_strerror(pamh, retval));
- krb5_cc_destroy(pam_context, ccache_perm);
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
-
- PAM_LOG("Environment done: KRB5CCNAME=%s", cache_name);
-
-cleanup2:
- krb5_free_principal(pam_context, princ);
- PAM_LOG("Done cleanup2");
-cleanup3:
- krb5_free_context(pam_context);
- PAM_LOG("Done cleanup3");
-
- seteuid(euid);
- setegid(egid);
-
- PAM_LOG("Done seteuid() & setegid()");
-
- if (cache_name_buf != NULL)
- free(cache_name_buf);
-
- return (retval);
-#endif
-}
-
-/*
- * account management
- */
-PAM_EXTERN int
-pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
- int argc __unused, const char *argv[] __unused)
-{
- krb5_error_code krbret;
- krb5_context pam_context;
- krb5_ccache ccache;
- krb5_principal princ;
- int retval;
- const void *user;
- const void *ccache_name;
-
- retval = pam_get_item(pamh, PAM_USER, &user);
- if (retval != PAM_SUCCESS)
- return (retval);
-
- PAM_LOG("Got user: %s", (const char *)user);
-
- retval = pam_get_data(pamh, "ccache", &ccache_name);
- if (retval != PAM_SUCCESS)
- return (PAM_SUCCESS);
-
- PAM_LOG("Got credentials");
-
- krbret = krb5_init_context(&pam_context);
- if (krbret != 0) {
- PAM_LOG("Error krb5_init_context() failed");
- return (PAM_PERM_DENIED);
- }
-
- PAM_LOG("Context initialised");
-
- krbret = krb5_cc_resolve(pam_context, (const char *)ccache_name, &ccache);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_resolve(\"%s\"): %s", (const char *)ccache_name,
- krb5_get_err_text(pam_context, krbret));
- krb5_free_context(pam_context);
- return (PAM_PERM_DENIED);
- }
-
- PAM_LOG("Got ccache %s", (const char *)ccache_name);
-
-
- krbret = krb5_cc_get_principal(pam_context, ccache, &princ);
- if (krbret != 0) {
- PAM_LOG("Error krb5_cc_get_principal(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_PERM_DENIED;
- goto cleanup;
- }
-
- PAM_LOG("Got principal");
-
- if (krb5_kuserok(pam_context, princ, (const char *)user))
- retval = PAM_SUCCESS;
- else
- retval = PAM_PERM_DENIED;
- krb5_free_principal(pam_context, princ);
-
- PAM_LOG("Done kuserok()");
-
-cleanup:
- krb5_free_context(pam_context);
- PAM_LOG("Done cleanup");
-
- return (retval);
-
-}
-
-/*
- * password management
- */
-PAM_EXTERN int
-pam_sm_chauthtok(pam_handle_t *pamh, int flags,
- int argc __unused, const char *argv[] __unused)
-{
- krb5_error_code krbret;
- krb5_context pam_context;
- krb5_creds creds;
- krb5_principal princ;
- krb5_get_init_creds_opt opts;
- krb5_data result_code_string, result_string;
- int result_code, retval;
- const char *pass;
- const void *user;
- char *princ_name, *passdup;
-
- if (!(flags & PAM_UPDATE_AUTHTOK))
- return (PAM_AUTHTOK_ERR);
-
- retval = pam_get_item(pamh, PAM_USER, &user);
- if (retval != PAM_SUCCESS)
- return (retval);
-
- PAM_LOG("Got user: %s", (const char *)user);
-
- krbret = krb5_init_context(&pam_context);
- if (krbret != 0) {
- PAM_LOG("Error krb5_init_context() failed");
- return (PAM_SERVICE_ERR);
- }
-
- PAM_LOG("Context initialised");
-
- krb5_get_init_creds_opt_init(&opts);
-
- PAM_LOG("Credentials options initialised");
-
- /* Get principal name */
- krbret = krb5_parse_name(pam_context, (const char *)user, &princ);
- if (krbret != 0) {
- PAM_LOG("Error krb5_parse_name(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_USER_UNKNOWN;
- goto cleanup3;
- }
-
- /* Now convert the principal name into something human readable */
- princ_name = NULL;
- krbret = krb5_unparse_name(pam_context, princ, &princ_name);
- if (krbret != 0) {
- PAM_LOG("Error krb5_unparse_name(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_SERVICE_ERR;
- goto cleanup2;
- }
-
- PAM_LOG("Got principal: %s", princ_name);
-
- /* Get password */
- retval = pam_get_authtok(pamh, PAM_OLDAUTHTOK, &pass, PASSWORD_PROMPT);
- if (retval != PAM_SUCCESS)
- goto cleanup2;
-
- PAM_LOG("Got password");
-
- memset(&creds, 0, sizeof(krb5_creds));
- krbret = krb5_get_init_creds_password(pam_context, &creds, princ,
- pass, NULL, pamh, 0, "kadmin/changepw", &opts);
- if (krbret != 0) {
- PAM_LOG("Error krb5_get_init_creds_password(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_AUTH_ERR;
- goto cleanup2;
- }
-
- PAM_LOG("Credentials established");
-
- /* Now get the new password */
- for (;;) {
- retval = pam_get_authtok(pamh,
- PAM_AUTHTOK, &pass, NEW_PASSWORD_PROMPT);
- if (retval != PAM_TRY_AGAIN)
- break;
- pam_error(pamh, "Mismatch; try again, EOF to quit.");
- }
- if (retval != PAM_SUCCESS)
- goto cleanup;
-
- PAM_LOG("Got new password");
-
- /* Change it */
- if ((passdup = strdup(pass)) == NULL) {
- retval = PAM_BUF_ERR;
- goto cleanup;
- }
- krbret = krb5_change_password(pam_context, &creds, passdup,
- &result_code, &result_code_string, &result_string);
- free(passdup);
- if (krbret != 0) {
- PAM_LOG("Error krb5_change_password(): %s",
- krb5_get_err_text(pam_context, krbret));
- retval = PAM_AUTHTOK_ERR;
- goto cleanup;
- }
- if (result_code) {
- PAM_LOG("Error krb5_change_password(): (result_code)");
- retval = PAM_AUTHTOK_ERR;
- goto cleanup;
- }
-
- PAM_LOG("Password changed");
-
- if (result_string.data)
- free(result_string.data);
- if (result_code_string.data)
- free(result_code_string.data);
-
-cleanup:
- krb5_free_cred_contents(pam_context, &creds);
- PAM_LOG("Done cleanup");
-cleanup2:
- krb5_free_principal(pam_context, princ);
- PAM_LOG("Done cleanup2");
-cleanup3:
- if (princ_name)
- free(princ_name);
-
- krb5_free_context(pam_context);
-
- PAM_LOG("Done cleanup3");
-
- return (retval);
-}
-
-PAM_MODULE_ENTRY("pam_krb5");
-
-/*
- * This routine with some modification is from the MIT V5B6 appl/bsd/login.c
- * Modified by Sam Hartman <hartmans@mit.edu> to support PAM services
- * for Debian.
- *
- * Verify the Kerberos ticket-granting ticket just retrieved for the
- * user. If the Kerberos server doesn't respond, assume the user is
- * trying to fake us out (since we DID just get a TGT from what is
- * supposedly our KDC). If the host/<host> service is unknown (i.e.,
- * the local keytab doesn't have it), and we cannot find another
- * service we do have, let her in.
- *
- * Returns 1 for confirmation, -1 for failure, 0 for uncertainty.
- */
-/* ARGSUSED */
-static int
-verify_krb_v5_tgt(krb5_context context, krb5_ccache ccache,
- char *pam_service, int debug)
-{
- krb5_error_code retval;
- krb5_principal princ;
- krb5_keyblock *keyblock;
- krb5_data packet;
- krb5_auth_context auth_context;
- char phost[BUFSIZ];
- const char *services[3], **service;
-
- packet.data = 0;
-
- /* If possible we want to try and verify the ticket we have
- * received against a keytab. We will try multiple service
- * principals, including at least the host principal and the PAM
- * service principal. The host principal is preferred because access
- * to that key is generally sufficient to compromise root, while the
- * service key for this PAM service may be less carefully guarded.
- * It is important to check the keytab first before the KDC so we do
- * not get spoofed by a fake KDC.
- */
- services[0] = "host";
- services[1] = pam_service;
- services[2] = NULL;
- keyblock = 0;
- retval = -1;
- for (service = &services[0]; *service != NULL; service++) {
- retval = krb5_sname_to_principal(context, NULL, *service,
- KRB5_NT_SRV_HST, &princ);
- if (retval != 0) {
- if (debug)
- syslog(LOG_DEBUG,
- "pam_krb5: verify_krb_v5_tgt(): %s: %s",
- "krb5_sname_to_principal()",
- krb5_get_err_text(context, retval));
- return -1;
- }
-
- /* Extract the name directly. */
- strncpy(phost, compat_princ_component(context, princ, 1),
- BUFSIZ);
- phost[BUFSIZ - 1] = '\0';
-
- /*
- * Do we have service/<host> keys?
- * (use default/configured keytab, kvno IGNORE_VNO to get the
- * first match, and ignore enctype.)
- */
- retval = krb5_kt_read_service_key(context, NULL, princ, 0, 0,
- &keyblock);
- if (retval != 0)
- continue;
- break;
- }
- if (retval != 0) { /* failed to find key */
- /* Keytab or service key does not exist */
- if (debug)
- syslog(LOG_DEBUG,
- "pam_krb5: verify_krb_v5_tgt(): %s: %s",
- "krb5_kt_read_service_key()",
- krb5_get_err_text(context, retval));
- retval = 0;
- goto cleanup;
- }
- if (keyblock)
- krb5_free_keyblock(context, keyblock);
-
- /* Talk to the kdc and construct the ticket. */
- auth_context = NULL;
- retval = krb5_mk_req(context, &auth_context, 0, *service, phost,
- NULL, ccache, &packet);
- if (auth_context) {
- krb5_auth_con_free(context, auth_context);
- auth_context = NULL; /* setup for rd_req */
- }
- if (retval) {
- if (debug)
- syslog(LOG_DEBUG,
- "pam_krb5: verify_krb_v5_tgt(): %s: %s",
- "krb5_mk_req()",
- krb5_get_err_text(context, retval));
- retval = -1;
- goto cleanup;
- }
-
- /* Try to use the ticket. */
- retval = krb5_rd_req(context, &auth_context, &packet, princ, NULL,
- NULL, NULL);
- if (retval) {
- if (debug)
- syslog(LOG_DEBUG,
- "pam_krb5: verify_krb_v5_tgt(): %s: %s",
- "krb5_rd_req()",
- krb5_get_err_text(context, retval));
- retval = -1;
- }
- else
- retval = 1;
-
-cleanup:
- if (packet.data)
- compat_free_data_contents(context, &packet);
- krb5_free_principal(context, princ);
- return retval;
-}
-
-/* Free the memory for cache_name. Called by pam_end() */
-/* ARGSUSED */
-static void
-cleanup_cache(pam_handle_t *pamh __unused, void *data, int pam_end_status __unused)
-{
- krb5_context pam_context;
- krb5_ccache ccache;
- krb5_error_code krbret;
-
- if (krb5_init_context(&pam_context))
- return;
-
- krbret = krb5_cc_resolve(pam_context, data, &ccache);
- if (krbret == 0)
- krb5_cc_destroy(pam_context, ccache);
- krb5_free_context(pam_context);
- free(data);
-}
-
-#ifdef COMPAT_HEIMDAL
-#ifdef COMPAT_MIT
-#error This cannot be MIT and Heimdal compatible!
-#endif
-#endif
-
-#ifndef COMPAT_HEIMDAL
-#ifndef COMPAT_MIT
-#error One of COMPAT_MIT and COMPAT_HEIMDAL must be specified!
-#endif
-#endif
-
-#ifdef COMPAT_HEIMDAL
-/* ARGSUSED */
-static const char *
-compat_princ_component(krb5_context context __unused, krb5_principal princ, int n)
-{
- return princ->name.name_string.val[n];
-}
-
-/* ARGSUSED */
-static void
-compat_free_data_contents(krb5_context context __unused, krb5_data * data)
-{
- krb5_xfree(data->data);
-}
-#endif
-
-#ifdef COMPAT_MIT
-static const char *
-compat_princ_component(krb5_context context, krb5_principal princ, int n)
-{
- return krb5_princ_component(context, princ, n)->data;
-}
-
-static void
-compat_free_data_contents(krb5_context context, krb5_data * data)
-{
- krb5_free_data_contents(context, data);
-}
-#endif
View
34 lib/pam_module/pam_ksu/Makefile
@@ -1,34 +0,0 @@
-# Copyright 2002 FreeBSD, 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.
-#
-# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-#
-# $FreeBSD: src/lib/libpam/modules/pam_ksu/Makefile,v 1.6 2004/08/06 07:27:04 cperciva Exp $
-
-LIB= pam_ksu
-SRCS= pam_ksu.c
-MAN= pam_ksu.8
-
-DPADD= ${LIBKRB5} ${LIBASN1} ${LIBROKEN} ${LIBCOM_ERR} ${LIBCRYPT} ${LIBCRYPTO}
-LDADD= -lkrb5 -lasn1 -lroken -lcom_err -lcrypt -lcrypto
-
-.include <bsd.lib.mk>
View
122 lib/pam_module/pam_ksu/pam_ksu.8
@@ -1,122 +0,0 @@
-.\" Copyright (c) 2001 Mark R V Murray
-.\" All rights reserved.
-.\" Copyright (c) 2001 Networks Associates Technology, Inc.
-.\" All rights reserved.
-.\"
-.\" This software was developed for the FreeBSD Project by ThinkSec AS and
-.\" NAI Labs, the Security Research Division of Network Associates, Inc.
-.\" under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
-.\" DARPA CHATS research program.
-.\"
-.\" 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. The name of the author may not be used to endorse or promote
-.\" products derived from this software without specific prior written
-.\" permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\" $FreeBSD: src/lib/libpam/modules/pam_ksu/pam_ksu.8,v 1.3 2002/12/12 08:19:47 ru Exp $
-.\"
-.Dd May 15, 2002
-.Dt PAM_KSU 8
-.Os
-.Sh NAME
-.Nm pam_ksu
-.Nd Kerberos 5 SU PAM module
-.Sh SYNOPSIS
-.Op Ar service-name
-.Ar module-type
-.Ar control-flag
-.Pa pam_ksu
-.Op Ar options
-.Sh DESCRIPTION
-The Kerberos 5 SU authentication service module for PAM,
-.Nm
-for only one PAM category: authentication.
-In terms of the
-.Ar module-type
-parameter, this is the
-.Dq Li auth
-feature.
-The module is specifically designed to be used with the
-.Xr su 1
-utility.
-.\" It also provides a null function for session management.
-.Ss Kerberos 5 SU Authentication Module
-The Kerberos 5 SU authentication component provides functions to verify
-the identity of a user
-.Pq Fn pam_sm_authenticate ,
-and determine whether or not the user is authorized to obtain the
-privileges of the target account.
-If the target account is
-.Dq root ,
-then the Kerberos 5 principal used
-for authentication and authorization will be the
-.Dq root
-instance of
-the current user, e.g.\&
-.Dq Li user/root@REAL.M .
-Otherwise, the principal will simply be the current user's default
-principal, e.g.\&
-.Dq Li user@REAL.M .
-.Pp
-The user is prompted for a password if necessary.
-Authorization is performed
-by comparing the Kerberos 5 principal with those listed in the
-.Pa .k5login
-file in the target account's home directory
-(e.g.\&
-.Pa /root/.k5login
-for root).
-.Pp
-The following options may be passed to the authentication module:
-.Bl -tag -width ".Cm use_first_pass"
-.It Cm debug
-.Xr syslog 3
-debugging information at
-.Dv LOG_DEBUG
-level.
-.It Cm use_first_pass
-If the authentication module
-is not the first in the stack,
-and a previous module
-obtained the user's password,
-that password is used
-to authenticate the user.
-If this fails,
-the authentication module returns failure
-without prompting the user for a password.
-This option has no effect
-if the authentication module
-is the first in the stack,
-or if no previous modules
-obtained the user's password.
-.It Cm try_first_pass
-This option is similar to the
-.Cm use_first_pass
-option,
-except that if the previously obtained password fails,
-the user is prompted for another password.
-.El
-.Sh SEE ALSO
-.Xr su 1 ,
-.Xr syslog 3 ,
-.Xr pam.conf 5 ,
-.Xr pam 8
View
257 lib/pam_module/pam_ksu/pam_ksu.c
@@ -1,257 +0,0 @@
-/*-
- * Copyright (c) 2002 Jacques A. Vidrine <nectar@FreeBSD.org>
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
- *
- * $FreeBSD: src/lib/libpam/modules/pam_ksu/pam_ksu.c,v 1.5 2004/02/10 10:13:21 des Exp $
- */
-
-#include <sys/param.h>
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <krb5.h>
-
-#define PAM_SM_AUTH
-#define PAM_SM_CRED
-#include <security/pam_appl.h>
-#include <security/pam_modules.h>
-#include <security/pam_mod_misc.h>
-
-static const char superuser[] = "root";
-
-static long get_su_principal(krb5_context, const char *, const char *,
- char **, krb5_principal *);
-static int auth_krb5(pam_handle_t *, krb5_context, const char *,
- krb5_principal);
-
-PAM_EXTERN int
-pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
- int argc __unused, const char *argv[] __unused)
-{
- krb5_context context;
- krb5_principal su_principal;
- const char *user;
- const void *ruser;
- char *su_principal_name;
- long rv;
- int pamret;
-
- pamret = pam_get_user(pamh, &user, NULL);
- if (pamret != PAM_SUCCESS)
- return (pamret);
- PAM_LOG("Got user: %s", user);
- pamret = pam_get_item(pamh, PAM_RUSER, &ruser);
- if (pamret != PAM_SUCCESS)
- return (pamret);
- PAM_LOG("Got ruser: %s", (const char *)ruser);
- rv = krb5_init_context(&context);
- if (rv != 0) {
- PAM_LOG("krb5_init_context failed: %s",
- krb5_get_err_text(context, rv));
- return (PAM_SERVICE_ERR);
- }
- rv = get_su_principal(context, user, ruser, &su_principal_name, &su_principal);
- if (rv != 0)
- return (PAM_AUTH_ERR);
- PAM_LOG("kuserok: %s -> %s", su_principal_name, user);
- rv = krb5_kuserok(context, su_principal, user);
- pamret = rv ? auth_krb5(pamh, context, su_principal_name, su_principal) : PAM_AUTH_ERR;
- free(su_principal_name);
- krb5_free_principal(context, su_principal);
- krb5_free_context(context);
- return (pamret);
-}
-
-PAM_EXTERN int
-pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
- int ac __unused, const char *av[] __unused)
-{
-
- return (PAM_SUCCESS);
-}
-
-/* Authenticate using Kerberos 5.
- * pamh -- The PAM handle.
- * context -- An initialized krb5_context.
- * su_principal_name -- The target principal name, used only for password prompts.
- * If NULL, the password prompts will not include a principal
- * name.
- * su_principal -- The target krb5_principal.
- * Note that a valid keytab in the default location with a host entry
- * must be available, and that the PAM application must have sufficient
- * privileges to access it.
- * Returns PAM_SUCCESS if authentication was successful, or an appropriate
- * PAM error code if it was not.
- */
-static int
-auth_krb5(pam_handle_t *pamh, krb5_context context, const char *su_principal_name,
- krb5_principal su_principal)
-{
- krb5_creds creds;
- krb5_get_init_creds_opt gic_opt;
- krb5_verify_init_creds_opt vic_opt;
- const char *pass;
- char *prompt;
- long rv;
- int pamret;
-
- prompt = NULL;
- krb5_get_init_creds_opt_init(&gic_opt);
- krb5_verify_init_creds_opt_init(&vic_opt);
- if (su_principal_name != NULL)
- asprintf(&prompt, "Password for %s:", su_principal_name);
- else
- asprintf(&prompt, "Password:");
- if (prompt == NULL)
- return (PAM_BUF_ERR);
- pass = NULL;
- pamret = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, prompt);
- free(prompt);
- if (pamret != PAM_SUCCESS)
- return (pamret);
- rv = krb5_get_init_creds_password(context, &creds, su_principal,
- pass, NULL, NULL, 0, NULL, &gic_opt);
- if (rv != 0) {
- PAM_LOG("krb5_get_init_creds_password: %s",
- krb5_get_err_text(context, rv));
- return (PAM_AUTH_ERR);
- }
- krb5_verify_init_creds_opt_set_ap_req_nofail(&vic_opt, 1);
- rv = krb5_verify_init_creds(context, &creds, NULL, NULL, NULL,
- &vic_opt);
- krb5_free_cred_contents(context, &creds);
- if (rv != 0) {
- PAM_LOG("krb5_verify_init_creds: %s",
- krb5_get_err_text(context, rv));
- return (PAM_AUTH_ERR);
- }
- return (PAM_SUCCESS);
-}
-
-/* Determine the target principal given the current user and the target user.
- * context -- An initialized krb5_context.
- * target_user -- The target username.
- * current_user -- The current username.
- * su_principal_name -- (out) The target principal name.
- * su_principal -- (out) The target krb5_principal.
- * When the target user is `root', the target principal will be a `root
- * instance', e.g. `luser/root@REA.LM'. Otherwise, the target principal
- * will simply be the current user's default principal name. Note that
- * in any case, if KRB5CCNAME is set and a credentials cache exists, the
- * principal name found there will be the `starting point', rather than
- * the ruser parameter.
- *
- * Returns 0 for success, or a com_err error code on failure.
- */
-static long
-get_su_principal(krb5_context context, const char *target_user,
- const char *current_user, char **su_principal_name,
- krb5_principal *su_principal)
-{
- krb5_principal default_principal;
- krb5_ccache ccache;
- char *principal_name, *ccname, *p;
- long rv;
- uid_t euid, ruid;
-
- *su_principal = NULL;
- default_principal = NULL;
- /* Unless KRB5CCNAME was explicitly set, we won't really be able
- * to look at the credentials cache since krb5_cc_default will
- * look at getuid().
- */
- ruid = getuid();
- euid = geteuid();
- rv = seteuid(ruid);
- if (rv != 0)
- return (errno);
- p = getenv("KRB5CCNAME");
- if (p != NULL)
- ccname = strdup(p);
- else
- asprintf(&ccname, "%s%lu", KRB5_DEFAULT_CCROOT, (unsigned long)ruid);
- if (ccname == NULL)
- return (errno);
- rv = krb5_cc_resolve(context, ccname, &ccache);
- free(ccname);
- if (rv == 0) {
- rv = krb5_cc_get_principal(context, ccache, &default_principal);
- krb5_cc_close(context, ccache);
- if (rv != 0)
- default_principal = NULL; /* just to be safe */
- }
- rv = seteuid(euid);
- if (rv != 0)
- return (errno);
- if (default_principal == NULL) {
- rv = krb5_make_principal(context, &default_principal, NULL, current_user, NULL);
- if (rv != 0) {
- PAM_LOG("Could not determine default principal name.");
- return (rv);
- }
- }
- /* Now that we have some principal, if the target account is
- * `root', then transform it into a `root' instance, e.g.
- * `user@REA.LM' -> `user/root@REA.LM'.
- */
- rv = krb5_unparse_name(context, default_principal, &principal_name);
- krb5_free_principal(context, default_principal);
- if (rv != 0) {
- PAM_LOG("krb5_unparse_name: %s",
- krb5_get_err_text(context, rv));
- return (rv);
- }
- PAM_LOG("Default principal name: %s", principal_name);
- if (strcmp(target_user, superuser) == 0) {
- p = strrchr(principal_name, '@');
- if (p == NULL) {
- PAM_LOG("malformed principal name `%s'", principal_name);
- free(principal_name);
- return (rv);
- }
- *p++ = '\0';
- *su_principal_name = NULL;
- asprintf(su_principal_name, "%s/%s@%s", principal_name, superuser, p);
- free(principal_name);
- } else
- *su_principal_name = principal_name;
-
- if (*su_principal_name == NULL)
- return (errno);
- rv = krb5_parse_name(context, *su_principal_name, &default_principal);
- if (rv != 0) {
- PAM_LOG("krb5_parse_name `%s': %s", *su_principal_name,
- krb5_get_err_text(context, rv));
- free(*su_principal_name);
- return (rv);
- }
- PAM_LOG("Target principal name: %s", *su_principal_name);
- *su_principal = default_principal;
- return (0);
-}
-
-PAM_MODULE_ENTRY("pam_ksu");
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