diff options
Diffstat (limited to 'lib/libpam/modules/pam_group/pam_group.c')
| -rw-r--r-- | lib/libpam/modules/pam_group/pam_group.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/lib/libpam/modules/pam_group/pam_group.c b/lib/libpam/modules/pam_group/pam_group.c new file mode 100644 index 0000000..a6e32cd --- /dev/null +++ b/lib/libpam/modules/pam_group/pam_group.c @@ -0,0 +1,133 @@ +/*- + * Copyright (c) 2003 Networks Associates Technology, Inc. + * Copyright (c) 2004-2011 Dag-Erling Smørgrav + * 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 + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> + +#include <grp.h> +#include <pwd.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +#define PAM_SM_AUTH + +#include <security/pam_appl.h> +#include <security/pam_modules.h> +#include <security/openpam.h> + + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + int local, remote; + const char *group, *user; + const void *ruser; + char *const *list; + struct passwd *pwd; + struct group *grp; + + /* get target account */ + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || + user == NULL || (pwd = getpwnam(user)) == NULL) + return (PAM_AUTH_ERR); + if (pwd->pw_uid != 0 && openpam_get_option(pamh, "root_only")) + return (PAM_IGNORE); + + /* check local / remote */ + local = openpam_get_option(pamh, "luser") ? 1 : 0; + remote = openpam_get_option(pamh, "ruser") ? 1 : 0; + if (local && remote) { + openpam_log(PAM_LOG_ERROR, "(pam_group) " + "the luser and ruser options are mutually exclusive"); + return (PAM_SERVICE_ERR); + } else if (local) { + /* we already have the correct struct passwd */ + } else { + if (!remote) + openpam_log(PAM_LOG_NOTICE, "(pam_group) " + "neither luser nor ruser specified, assuming ruser"); + /* default / historical behavior */ + if (pam_get_item(pamh, PAM_RUSER, &ruser) != PAM_SUCCESS || + ruser == NULL || (pwd = getpwnam(ruser)) == NULL) + return (PAM_AUTH_ERR); + } + + /* get regulating group */ + if ((group = openpam_get_option(pamh, "group")) == NULL) + group = "wheel"; + if ((grp = getgrnam(group)) == NULL || grp->gr_mem == NULL) + goto failed; + + /* check if the group is empty */ + if (*grp->gr_mem == NULL) + goto failed; + + /* check membership */ + if (pwd->pw_gid == grp->gr_gid) + goto found; + for (list = grp->gr_mem; *list != NULL; ++list) + if (strcmp(*list, pwd->pw_name) == 0) + goto found; + + not_found: + if (openpam_get_option(pamh, "deny")) + return (PAM_SUCCESS); + return (PAM_AUTH_ERR); + found: + if (openpam_get_option(pamh, "deny")) + return (PAM_AUTH_ERR); + return (PAM_SUCCESS); + failed: + if (openpam_get_option(pamh, "fail_safe")) + goto found; + else + goto not_found; +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + + return (PAM_SUCCESS); +} + +PAM_MODULE_ENTRY("pam_group"); |
