From de848d9e9146434817c65d74d1d0313e9d729462 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 14:01:37 +0200 Subject: Adding upstream version 1.4.0. Signed-off-by: Daniel Baumann --- modules/pam_sepermit/Makefile.am | 42 + modules/pam_sepermit/Makefile.in | 1230 ++++++++++++++++++++++++++++++ modules/pam_sepermit/README | 48 ++ modules/pam_sepermit/README.xml | 41 + modules/pam_sepermit/pam_sepermit.8 | 131 ++++ modules/pam_sepermit/pam_sepermit.8.xml | 194 +++++ modules/pam_sepermit/pam_sepermit.c | 440 +++++++++++ modules/pam_sepermit/sepermit.conf | 11 + modules/pam_sepermit/sepermit.conf.5 | 117 +++ modules/pam_sepermit/sepermit.conf.5.xml | 110 +++ modules/pam_sepermit/tst-pam_sepermit | 2 + 11 files changed, 2366 insertions(+) create mode 100644 modules/pam_sepermit/Makefile.am create mode 100644 modules/pam_sepermit/Makefile.in create mode 100644 modules/pam_sepermit/README create mode 100644 modules/pam_sepermit/README.xml create mode 100644 modules/pam_sepermit/pam_sepermit.8 create mode 100644 modules/pam_sepermit/pam_sepermit.8.xml create mode 100644 modules/pam_sepermit/pam_sepermit.c create mode 100644 modules/pam_sepermit/sepermit.conf create mode 100644 modules/pam_sepermit/sepermit.conf.5 create mode 100644 modules/pam_sepermit/sepermit.conf.5.xml create mode 100755 modules/pam_sepermit/tst-pam_sepermit (limited to 'modules/pam_sepermit') diff --git a/modules/pam_sepermit/Makefile.am b/modules/pam_sepermit/Makefile.am new file mode 100644 index 0000000..18a89b6 --- /dev/null +++ b/modules/pam_sepermit/Makefile.am @@ -0,0 +1,42 @@ +# +# Copyright (c) 2005, 2006, 2007 Thorsten Kukuk +# Copyright (c) 2008, 2009 Red Hat, Inc. +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = pam_sepermit.8 sepermit.conf.5 +endif +XMLS = README.xml pam_sepermit.8.xml sepermit.conf.5.xml +dist_check_SCRIPTS = tst-pam_sepermit +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) +sepermitlockdir = ${localstatedir}/run/sepermit + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -I$(top_srcdir)/libpam_misc/include \ + -D SEPERMIT_CONF_FILE=\"$(SCONFIGDIR)/sepermit.conf\" \ + -D SEPERMIT_LOCKDIR=\"$(sepermitlockdir)\" $(WARN_CFLAGS) + +pam_sepermit_la_LIBADD = $(top_builddir)/libpam/libpam.la @LIBSELINUX@ +pam_sepermit_la_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + pam_sepermit_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +dist_secureconf_DATA = sepermit.conf +securelib_LTLIBRARIES = pam_sepermit.la + +install-data-local: + mkdir -p $(DESTDIR)$(sepermitlockdir) + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_sepermit/Makefile.in b/modules/pam_sepermit/Makefile.in new file mode 100644 index 0000000..0de1354 --- /dev/null +++ b/modules/pam_sepermit/Makefile.in @@ -0,0 +1,1230 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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Otherwise he is +denied access. For users not matching any entry in the config file the +pam_sepermit module returns PAM_IGNORE return value. + +The config file contains a list of user names one per line with optional +arguments. If the name is prefixed with @ character it means that all users in +the group name match. If it is prefixed with a % character the SELinux user is +used to match against the name instead of the account name. Note that when +SELinux is disabled the SELinux user assigned to the account cannot be +determined. This means that such entries are never matched when SELinux is +disabled and pam_sepermit will return PAM_IGNORE. + +See sepermit.conf(5) for details. + +OPTIONS + +debug + + Turns on debugging via syslog(3). + +conf=/path/to/config/file + + Path to alternative config file overriding the default. + +EXAMPLES + +auth [success=done ignore=ignore default=bad] pam_sepermit.so +auth required pam_unix.so +account required pam_unix.so +session required pam_permit.so + + +AUTHOR + +pam_sepermit and this manual page were written by Tomas Mraz +. + diff --git a/modules/pam_sepermit/README.xml b/modules/pam_sepermit/README.xml new file mode 100644 index 0000000..bb65951 --- /dev/null +++ b/modules/pam_sepermit/README.xml @@ -0,0 +1,41 @@ + + +--> +]> + +
+ + + + + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_sepermit.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_sepermit-name"]/*)'/> + + + + +
+ +
+ +
+ +
+ +
+ +
+ +
+ +
+ +
diff --git a/modules/pam_sepermit/pam_sepermit.8 b/modules/pam_sepermit/pam_sepermit.8 new file mode 100644 index 0000000..37460ab --- /dev/null +++ b/modules/pam_sepermit/pam_sepermit.8 @@ -0,0 +1,131 @@ +'\" t +.\" Title: pam_sepermit +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_SEPERMIT" "8" "06/08/2020" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +pam_sepermit \- PAM module to allow/deny login depending on SELinux enforcement state +.SH "SYNOPSIS" +.HP \w'\fBpam_sepermit\&.so\fR\ 'u +\fBpam_sepermit\&.so\fR [debug] [conf=\fI/path/to/config/file\fR] +.SH "DESCRIPTION" +.PP +The pam_sepermit module allows or denies login depending on SELinux enforcement state\&. +.PP +When the user which is logging in matches an entry in the config file he is allowed access only when the SELinux is in enforcing mode\&. Otherwise he is denied access\&. For users not matching any entry in the config file the pam_sepermit module returns PAM_IGNORE return value\&. +.PP +The config file contains a list of user names one per line with optional arguments\&. If the +\fIname\fR +is prefixed with +\fI@\fR +character it means that all users in the group +\fIname\fR +match\&. If it is prefixed with a +\fI%\fR +character the SELinux user is used to match against the +\fIname\fR +instead of the account name\&. Note that when SELinux is disabled the SELinux user assigned to the account cannot be determined\&. This means that such entries are never matched when SELinux is disabled and pam_sepermit will return PAM_IGNORE\&. +.PP +See +\fBsepermit.conf\fR(5) +for details\&. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Turns on debugging via +\fBsyslog\fR(3)\&. +.RE +.PP +\fBconf=\fR\fB\fI/path/to/config/file\fR\fR +.RS 4 +Path to alternative config file overriding the default\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +The +\fBauth\fR +and +\fBaccount\fR +module types are provided\&. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +SELinux is disabled or in the permissive mode and the user matches\&. +.RE +.PP +PAM_SUCCESS +.RS 4 +SELinux is in the enforcing mode and the user matches\&. +.RE +.PP +PAM_IGNORE +.RS 4 +The user does not match any entry in the config file\&. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The module was unable to determine the user\*(Aqs name\&. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Error during reading or parsing the config file\&. +.RE +.SH "FILES" +.PP +/etc/security/sepermit\&.conf +.RS 4 +Default configuration file +.RE +.SH "EXAMPLES" +.sp +.if n \{\ +.RS 4 +.\} +.nf +auth [success=done ignore=ignore default=bad] pam_sepermit\&.so +auth required pam_unix\&.so +account required pam_unix\&.so +session required pam_permit\&.so + +.fi +.if n \{\ +.RE +.\} +.SH "SEE ALSO" +.PP +\fBsepermit.conf\fR(5), +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +\fBselinux\fR(8) +.SH "AUTHOR" +.PP +pam_sepermit and this manual page were written by Tomas Mraz \&. diff --git a/modules/pam_sepermit/pam_sepermit.8.xml b/modules/pam_sepermit/pam_sepermit.8.xml new file mode 100644 index 0000000..30d9cc5 --- /dev/null +++ b/modules/pam_sepermit/pam_sepermit.8.xml @@ -0,0 +1,194 @@ + + + + + + + pam_sepermit + 8 + Linux-PAM Manual + + + + pam_sepermit + PAM module to allow/deny login depending on SELinux enforcement state + + + + + pam_sepermit.so + + debug + + + conf=/path/to/config/file + + + + + + DESCRIPTION + + The pam_sepermit module allows or denies login depending on SELinux + enforcement state. + + + When the user which is logging in matches an entry in the config file + he is allowed access only when the SELinux is in enforcing mode. Otherwise + he is denied access. For users not matching any entry in the config file + the pam_sepermit module returns PAM_IGNORE return value. + + + The config file contains a list of user names one per line with optional arguments. If the + name is prefixed with @ character it means that all + users in the group name match. If it is prefixed + with a % character the SELinux user is used to match against the name + instead of the account name. Note that when SELinux is disabled the + SELinux user assigned to the account cannot be determined. This means that + such entries are never matched when SELinux is disabled and pam_sepermit + will return PAM_IGNORE. + + + See + sepermit.conf5 + for details. + + + + + + OPTIONS + + + + + + + + Turns on debugging via + + syslog3 + . + + + + + + + + + + Path to alternative config file overriding the default. + + + + + + + + MODULE TYPES PROVIDED + + The and + module types are provided. + + + + + RETURN VALUES + + + PAM_AUTH_ERR + + + SELinux is disabled or in the permissive mode and the user + matches. + + + + + PAM_SUCCESS + + + SELinux is in the enforcing mode and the user matches. + + + + + PAM_IGNORE + + + The user does not match any entry in the config file. + + + + + PAM_USER_UNKNOWN + + + The module was unable to determine the user's name. + + + + + PAM_SERVICE_ERR + + + Error during reading or parsing the config file. + + + + + + + + FILES + + + /etc/security/sepermit.conf + + Default configuration file + + + + + + + EXAMPLES + +auth [success=done ignore=ignore default=bad] pam_sepermit.so +auth required pam_unix.so +account required pam_unix.so +session required pam_permit.so + + + + + SEE ALSO + + + sepermit.conf5 + , + + pam.conf5 + , + + pam.d5 + , + + pam8 + + + selinux8 + + + + + + AUTHOR + + pam_sepermit and this manual page were written by Tomas Mraz <tmraz@redhat.com>. + + + + diff --git a/modules/pam_sepermit/pam_sepermit.c b/modules/pam_sepermit/pam_sepermit.c new file mode 100644 index 0000000..f7d98d5 --- /dev/null +++ b/modules/pam_sepermit/pam_sepermit.c @@ -0,0 +1,440 @@ +/****************************************************************************** + * A module for Linux-PAM that allows/denies access based on SELinux state. + * + * Copyright (c) 2007, 2008, 2009 Red Hat, Inc. + * Originally written by Tomas Mraz + * Contributions by Dan Walsh + * + * 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, 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. + */ + +#include "config.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include + +#define MODULE "pam_sepermit" +#define OPT_DELIM ":" + +struct lockfd { + uid_t uid; + int fd; + int debug; +}; + +#define PROC_BASE "/proc" +#define MAX_NAMES (int)(sizeof(unsigned long)*8) + +static int +match_process_uid(pid_t pid, uid_t uid) +{ + char buf[128]; + uid_t puid; + FILE *f; + int re = 0; + + snprintf (buf, sizeof buf, PROC_BASE "/%d/status", pid); + if (!(f = fopen (buf, "r"))) + return 0; + + while (fgets(buf, sizeof buf, f)) { + if (sscanf (buf, "Uid:\t%d", &puid)) { + re = uid == puid; + break; + } + } + fclose(f); + return re; +} + +static int +check_running (pam_handle_t *pamh, uid_t uid, int killall, int debug) +{ + DIR *dir; + struct dirent *de; + pid_t *pid_table, pid, self; + int i; + int pids, max_pids; + int running = 0; + self = getpid(); + if (!(dir = opendir(PROC_BASE))) { + pam_syslog(pamh, LOG_ERR, "Failed to open proc directory file %s:", PROC_BASE); + return -1; + } + max_pids = 256; + pid_table = malloc(max_pids * sizeof (pid_t)); + if (!pid_table) { + (void)closedir(dir); + pam_syslog(pamh, LOG_CRIT, "Memory allocation error"); + return -1; + } + pids = 0; + while ((de = readdir (dir)) != NULL) { + if (!(pid = (pid_t)atoi(de->d_name)) || pid == self) + continue; + + if (pids == max_pids) { + pid_t *npt; + + if (!(npt = realloc(pid_table, 2*pids*sizeof(pid_t)))) { + free(pid_table); + (void)closedir(dir); + pam_syslog(pamh, LOG_CRIT, "Memory allocation error"); + return -1; + } + pid_table = npt; + max_pids *= 2; + } + pid_table[pids++] = pid; + } + + (void)closedir(dir); + + for (i = 0; i < pids; i++) { + pid_t id; + + if (match_process_uid(pid_table[i], uid) == 0) + continue; + id = pid_table[i]; + + if (killall) { + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Attempting to kill %d", id); + kill(id, SIGKILL); + } + running++; + } + + free(pid_table); + return running; +} + +/* + * This function reads the loginuid from the /proc system. It returns + * (uid_t)-1 on failure. + */ +static uid_t get_loginuid(pam_handle_t *pamh) +{ + int fd, count; + char loginuid[24]; + char *eptr; + uid_t rv = (uid_t)-1; + + fd = open("/proc/self/loginuid", O_NOFOLLOW|O_RDONLY); + if (fd < 0) { + if (errno != ENOENT) { + pam_syslog(pamh, LOG_ERR, + "Cannot open /proc/self/loginuid: %m"); + } + return rv; + } + if ((count = pam_modutil_read(fd, loginuid, sizeof(loginuid)-1)) < 1) { + close(fd); + return rv; + } + loginuid[count] = '\0'; + close(fd); + + errno = 0; + rv = strtoul(loginuid, &eptr, 10); + if (errno != 0 || eptr == loginuid) + rv = (uid_t) -1; + + return rv; +} + +static void +sepermit_unlock(pam_handle_t *pamh, void *plockfd, int error_status UNUSED) +{ + struct lockfd *lockfd = plockfd; + struct flock fl; + + memset(&fl, 0, sizeof(fl)); + fl.l_type = F_UNLCK; + fl.l_whence = SEEK_SET; + + if (lockfd->debug) + pam_syslog(pamh, LOG_ERR, "Unlocking fd: %d uid: %d", lockfd->fd, lockfd->uid); + + /* Don't kill uid==0 */ + if (lockfd->uid) + /* This is a DOS but it prevents an app from forking to prevent killing */ + while(check_running(pamh, lockfd->uid, 1, lockfd->debug) > 0) + continue; + + (void)fcntl(lockfd->fd, F_SETLK, &fl); + (void)close(lockfd->fd); + free(lockfd); +} + +static int +sepermit_lock(pam_handle_t *pamh, const char *user, int debug) +{ + char buf[PATH_MAX]; + struct flock fl; + + memset(&fl, 0, sizeof(fl)); + fl.l_type = F_WRLCK; + fl.l_whence = SEEK_SET; + + struct passwd *pw = pam_modutil_getpwnam( pamh, user ); + if (!pw) { + pam_syslog(pamh, LOG_NOTICE, "Unable to find uid for user %s", + user); + return -1; + } + if (check_running(pamh, pw->pw_uid, 0, debug) > 0) { + pam_syslog(pamh, LOG_ERR, "User %s processes are running. Exclusive login not allowed", user); + return -1; + } + + snprintf(buf, sizeof(buf), "%s/%d.lock", SEPERMIT_LOCKDIR, pw->pw_uid); + int fd = open(buf, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR); + if (fd < 0) { + pam_syslog(pamh, LOG_ERR, "Unable to open lock file %s/%d.lock", SEPERMIT_LOCKDIR, pw->pw_uid); + return -1; + } + + /* Need to close on exec */ + fcntl(fd, F_SETFD, FD_CLOEXEC); + + if (fcntl(fd, F_SETLK, &fl) == -1) { + pam_syslog(pamh, LOG_ERR, "User %s with exclusive login already logged in", user); + close(fd); + return -1; + } + struct lockfd *lockfd=calloc(1, sizeof(struct lockfd)); + if (!lockfd) { + close(fd); + pam_syslog(pamh, LOG_CRIT, "Memory allocation error"); + return -1; + } + lockfd->uid = pw->pw_uid; + lockfd->debug = debug; + lockfd->fd=fd; + pam_set_data(pamh, MODULE, lockfd, sepermit_unlock); + return 0; +} + +/* return 0 when matched, -1 when unmatched, pam error otherwise */ +static int +sepermit_match(pam_handle_t *pamh, const char *cfgfile, const char *user, + const char *seuser, int debug, int *sense) +{ + FILE *f; + char *line = NULL; + char *start; + size_t len = 0; + int matched = 0; + int exclusive = 0; + int ignore = 0; + + f = fopen(cfgfile, "r"); + + if (!f) { + pam_syslog(pamh, LOG_ERR, "Failed to open config file %s: %m", cfgfile); + return PAM_SERVICE_ERR; + } + + while (!matched && getline(&line, &len, f) != -1) { + size_t n; + char *sptr; + char *opt; + + if (line[0] == '#') + continue; + + start = line; + while (isspace(*start)) + ++start; + n = strlen(start); + while (n > 0 && isspace(start[n-1])) { + --n; + } + if (n == 0) + continue; + + start[n] = '\0'; + start = strtok_r(start, OPT_DELIM, &sptr); + + switch (start[0]) { + case '@': + ++start; + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Matching user %s against group %s", user, start); + if (pam_modutil_user_in_group_nam_nam(pamh, user, start)) { + matched = 1; + } + break; + case '%': + if (seuser == NULL) + break; + ++start; + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Matching seuser %s against seuser %s", seuser, start); + if (strcmp(seuser, start) == 0) { + matched = 1; + } + break; + default: + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Matching user %s against user %s", user, start); + if (strcmp(user, start) == 0) { + matched = 1; + } + } + if (matched) + while ((opt=strtok_r(NULL, OPT_DELIM, &sptr)) != NULL) { + if (strcmp(opt, "exclusive") == 0) + exclusive = 1; + else if (strcmp(opt, "ignore") == 0) + ignore = 1; + else if (debug) { + pam_syslog(pamh, LOG_NOTICE, "Unknown user option: %s", opt); + } + } + } + + free(line); + fclose(f); + if (matched) { + if (*sense == PAM_SUCCESS) { + if (ignore) + *sense = PAM_IGNORE; + if (geteuid() == 0 && exclusive && get_loginuid(pamh) == (uid_t)-1) + if (sepermit_lock(pamh, user, debug) < 0) + *sense = PAM_AUTH_ERR; + } + return 0; + } + else + return -1; +} + +int +pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i; + int rv; + int debug = 0; + int sense = PAM_AUTH_ERR; + const char *user = NULL; + char *seuser = NULL; + char *level = NULL; + const char *cfgfile = SEPERMIT_CONF_FILE; + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + } + if (strcmp(argv[i], "conf=") == 0) { + cfgfile = argv[i] + 5; + } + } + + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Parsing config file: %s", cfgfile); + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || *user == '\0') { + pam_syslog(pamh, LOG_NOTICE, "cannot determine user name"); + return PAM_USER_UNKNOWN; + } + + if (is_selinux_enabled() > 0) { + if (security_getenforce() == 1) { + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Enforcing mode, access will be allowed on match"); + sense = PAM_SUCCESS; + } + } + + if (getseuserbyname(user, &seuser, &level) != 0) { + seuser = NULL; + level = NULL; + pam_syslog(pamh, LOG_ERR, "getseuserbyname failed: %m"); + } + + if (debug && sense != PAM_SUCCESS) + pam_syslog(pamh, LOG_NOTICE, "Access will not be allowed on match"); + + rv = sepermit_match(pamh, cfgfile, user, seuser, debug, &sense); + + if (debug) + pam_syslog(pamh, LOG_NOTICE, "sepermit_match returned: %d", rv); + + free(seuser); + free(level); + + switch (rv) { + case -1: + return PAM_IGNORE; + case 0: + return sense; + } + + return rv; +} + +int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} diff --git a/modules/pam_sepermit/sepermit.conf b/modules/pam_sepermit/sepermit.conf new file mode 100644 index 0000000..951f3df --- /dev/null +++ b/modules/pam_sepermit/sepermit.conf @@ -0,0 +1,11 @@ +# /etc/security/sepermit.conf +# +# Each line contains either: +# - an user name +# - a group name, with @group syntax +# - a SELinux user name, with %seuser syntax +# Each line can contain optional arguments separated by : +# The possible arguments are: +# - exclusive - only single login session will +# be allowed for the user and the user's processes +# will be killed on logout diff --git a/modules/pam_sepermit/sepermit.conf.5 b/modules/pam_sepermit/sepermit.conf.5 new file mode 100644 index 0000000..f2b5d09 --- /dev/null +++ b/modules/pam_sepermit/sepermit.conf.5 @@ -0,0 +1,117 @@ +'\" t +.\" Title: sepermit.conf +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "SEPERMIT\&.CONF" "5" "06/08/2020" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +sepermit.conf \- configuration file for the pam_sepermit module +.SH "DESCRIPTION" +.PP +The lines of the configuration file have the following syntax: +.PP +\fI\fR[:\fI