diff options
Diffstat (limited to 'modules/pam_tally2/pam_tally2.c')
| -rw-r--r-- | modules/pam_tally2/pam_tally2.c | 1049 |
1 files changed, 1049 insertions, 0 deletions
diff --git a/modules/pam_tally2/pam_tally2.c b/modules/pam_tally2/pam_tally2.c new file mode 100644 index 0000000..da1c048 --- /dev/null +++ b/modules/pam_tally2/pam_tally2.c @@ -0,0 +1,1049 @@ +/* + * pam_tally2.c + * + */ + + +/* By Tim Baverstock <warwick@mmm.co.uk>, Multi Media Machine Ltd. + * 5 March 1997 + * + * Stuff stolen from pam_rootok and pam_listfile + * + * Changes by Tomas Mraz <tmraz@redhat.com> 5 January 2005, 26 January 2006 + * Audit option added for Tomas patch by Sebastien Tricaud <toady@gscore.org> 13 January 2005 + * Portions Copyright 2006, Red Hat, Inc. + * Portions Copyright 1989 - 1993, Julianne Frances Haugh + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Julianne F. Haugh nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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 "config.h" + +#if defined(MAIN) && defined(MEMORY_DEBUG) +# undef exit +#endif /* defined(MAIN) && defined(MEMORY_DEBUG) */ + +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <stdarg.h> +#include <stdlib.h> +#include <syslog.h> +#include <pwd.h> +#include <time.h> +#include <stdint.h> +#include <errno.h> +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#endif + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/param.h> +#include <fcntl.h> +#include <unistd.h> +#include <signal.h> +#include "tallylog.h" + +#ifndef TRUE +#define TRUE 1L +#define FALSE 0L +#endif + +#ifndef HAVE_FSEEKO +#define fseeko fseek +#endif + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#ifndef MAIN +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +/* #define PAM_SM_SESSION */ +/* #define PAM_SM_PASSWORD */ + +#include <security/pam_ext.h> +#endif +#include <security/pam_modutil.h> +#include <security/pam_modules.h> + +/*---------------------------------------------------------------------*/ + +#define DEFAULT_LOGFILE "/var/log/tallylog" +#define MODULE_NAME "pam_tally2" + +#define tally_t uint16_t +#define TALLY_HI ((tally_t)~0L) + +struct tally_options { + const char *filename; + tally_t deny; + long lock_time; + long unlock_time; + long root_unlock_time; + unsigned int ctrl; +}; + +#define PHASE_UNKNOWN 0 +#define PHASE_AUTH 1 +#define PHASE_ACCOUNT 2 +#define PHASE_SESSION 3 + +#define OPT_MAGIC_ROOT 01 +#define OPT_FAIL_ON_ERROR 02 +#define OPT_DENY_ROOT 04 +#define OPT_QUIET 040 +#define OPT_AUDIT 0100 +#define OPT_NOLOGNOTICE 0400 +#define OPT_SERIALIZE 01000 +#define OPT_DEBUG 02000 + +#define MAX_LOCK_WAITING_TIME 10 + +/*---------------------------------------------------------------------*/ + +/* some syslogging */ + +#ifdef MAIN +#define pam_syslog tally_log +static void +tally_log (const pam_handle_t *pamh UNUSED, int priority UNUSED, + const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + fprintf(stderr, "%s: ", MODULE_NAME); + vfprintf(stderr, fmt, args); + fprintf(stderr,"\n"); + va_end(args); +} + +#define pam_modutil_getpwnam(pamh, user) getpwnam(user) +#endif + +/*---------------------------------------------------------------------*/ + +/* --- Support function: parse arguments --- */ + +#ifndef MAIN + +static void +log_phase_no_auth(pam_handle_t *pamh, int phase, const char *argv) +{ + if ( phase != PHASE_AUTH ) { + pam_syslog(pamh, LOG_ERR, + "option %s allowed in auth phase only", argv); + } +} + +static int +tally_parse_args(pam_handle_t *pamh, struct tally_options *opts, + int phase, int argc, const char **argv) +{ + memset(opts, 0, sizeof(*opts)); + opts->filename = DEFAULT_LOGFILE; + opts->ctrl = OPT_FAIL_ON_ERROR; + opts->root_unlock_time = -1; + + for ( ; argc-- > 0; ++argv ) { + + if ( ! strncmp( *argv, "file=", 5 ) ) { + const char *from = *argv + 5; + if ( *from!='/' ) { + pam_syslog(pamh, LOG_ERR, + "filename not /rooted; %s", *argv); + return PAM_AUTH_ERR; + } + opts->filename = from; + } + else if ( ! strcmp( *argv, "onerr=fail" ) ) { + opts->ctrl |= OPT_FAIL_ON_ERROR; + } + else if ( ! strcmp( *argv, "onerr=succeed" ) ) { + opts->ctrl &= ~OPT_FAIL_ON_ERROR; + } + else if ( ! strcmp( *argv, "magic_root" ) ) { + opts->ctrl |= OPT_MAGIC_ROOT; + } + else if ( ! strcmp( *argv, "serialize" ) ) { + opts->ctrl |= OPT_SERIALIZE; + } + else if ( ! strcmp( *argv, "debug" ) ) { + opts->ctrl |= OPT_DEBUG; + } + else if ( ! strcmp( *argv, "even_deny_root_account" ) || + ! strcmp( *argv, "even_deny_root" ) ) { + log_phase_no_auth(pamh, phase, *argv); + opts->ctrl |= OPT_DENY_ROOT; + } + else if ( ! strncmp( *argv, "deny=", 5 ) ) { + log_phase_no_auth(pamh, phase, *argv); + if ( sscanf((*argv)+5,"%hu",&opts->deny) != 1 ) { + pam_syslog(pamh, LOG_ERR, "bad number supplied: %s", *argv); + return PAM_AUTH_ERR; + } + } + else if ( ! strncmp( *argv, "lock_time=", 10 ) ) { + log_phase_no_auth(pamh, phase, *argv); + if ( sscanf((*argv)+10,"%ld",&opts->lock_time) != 1 ) { + pam_syslog(pamh, LOG_ERR, "bad number supplied: %s", *argv); + return PAM_AUTH_ERR; + } + } + else if ( ! strncmp( *argv, "unlock_time=", 12 ) ) { + log_phase_no_auth(pamh, phase, *argv); + if ( sscanf((*argv)+12,"%ld",&opts->unlock_time) != 1 ) { + pam_syslog(pamh, LOG_ERR, "bad number supplied: %s", *argv); + return PAM_AUTH_ERR; + } + } + else if ( ! strncmp( *argv, "root_unlock_time=", 17 ) ) { + log_phase_no_auth(pamh, phase, *argv); + if ( sscanf((*argv)+17,"%ld",&opts->root_unlock_time) != 1 ) { + pam_syslog(pamh, LOG_ERR, "bad number supplied: %s", *argv); + return PAM_AUTH_ERR; + } + opts->ctrl |= OPT_DENY_ROOT; /* even_deny_root implied */ + } + else if ( ! strcmp( *argv, "quiet" ) || + ! strcmp ( *argv, "silent")) { + opts->ctrl |= OPT_QUIET; + } + else if ( ! strcmp ( *argv, "no_log_info") ) { + opts->ctrl |= OPT_NOLOGNOTICE; + } + else if ( ! strcmp ( *argv, "audit") ) { + opts->ctrl |= OPT_AUDIT; + } + else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + if (opts->root_unlock_time == -1) + opts->root_unlock_time = opts->unlock_time; + + return PAM_SUCCESS; +} + +#endif /* #ifndef MAIN */ + +/*---------------------------------------------------------------------*/ + +/* --- Support function: get uid (and optionally username) from PAM or + cline_user --- */ + +#ifdef MAIN +static char *cline_user=0; /* cline_user is used in the administration prog */ +#endif + +static int +pam_get_uid(pam_handle_t *pamh, uid_t *uid, const char **userp, struct tally_options *opts) +{ + const char *user = NULL; + struct passwd *pw; + +#ifdef MAIN + user = cline_user; +#else + if ((pam_get_user( pamh, &user, NULL )) != PAM_SUCCESS) { + user = NULL; + } +#endif + + if ( !user || !*user ) { + pam_syslog(pamh, LOG_ERR, "pam_get_uid; user?"); + return PAM_AUTH_ERR; + } + + if ( ! ( pw = pam_modutil_getpwnam( pamh, user ) ) ) { + opts->ctrl & OPT_AUDIT ? + pam_syslog(pamh, LOG_ERR, "pam_get_uid; no such user %s", user) : + pam_syslog(pamh, LOG_ERR, "pam_get_uid; no such user"); + return PAM_USER_UNKNOWN; + } + + if ( uid ) *uid = pw->pw_uid; + if ( userp ) *userp = user; + return PAM_SUCCESS; +} + +/*---------------------------------------------------------------------*/ + +/* --- Support functions: set/get tally data --- */ + +#ifndef MAIN + +struct tally_data { + time_t time; + int tfile; +}; + +static void +_cleanup(pam_handle_t *pamh UNUSED, void *void_data, int error_status UNUSED) +{ + struct tally_data *data = void_data; + if (data->tfile != -1) + close(data->tfile); + free(data); +} + +static void +tally_set_data( pam_handle_t *pamh, time_t oldtime, int tfile ) +{ + struct tally_data *data; + + if ( (data=malloc(sizeof(*data))) != NULL ) { + data->time = oldtime; + data->tfile = tfile; + pam_set_data(pamh, MODULE_NAME, (void *)data, _cleanup); + } +} + +static int +tally_get_data( pam_handle_t *pamh, time_t *oldtime, int *tfile ) +{ + int rv; + const void *void_data; + const struct tally_data *data; + + rv = pam_get_data(pamh, MODULE_NAME, &void_data); + if ( rv == PAM_SUCCESS && void_data != NULL && oldtime != NULL ) { + data = void_data; + *oldtime = data->time; + *tfile = data->tfile; + } + else { + rv = -1; + *oldtime = 0; + } + return rv; +} +#endif /* #ifndef MAIN */ + +/*---------------------------------------------------------------------*/ + +/* --- Support function: open/create tallyfile and return tally for uid --- */ + +/* If on entry tallyfile doesn't exist, creation is attempted. */ + +static void +alarm_handler(int sig UNUSED) +{ /* we just need to ignore it */ +} + +static int +get_tally(pam_handle_t *pamh, uid_t uid, const char *filename, + int *tfile, struct tallylog *tally, unsigned int ctrl) +{ + struct stat fileinfo; + int lstat_ret; + void *void_tally = tally; + int preopened = 0; + + if (*tfile != -1) { + preopened = 1; + goto skip_open; + } + + lstat_ret = lstat(filename, &fileinfo); + if (lstat_ret) { + *tfile=open(filename, O_APPEND|O_CREAT, S_IRUSR|S_IWUSR); + /* Create file, or append-open in pathological case. */ + if (*tfile == -1) { +#ifndef MAIN + if (errno == EACCES) { + return PAM_IGNORE; /* called with insufficient access rights */ + } +#endif + pam_syslog(pamh, LOG_ALERT, "Couldn't create %s: %m", filename); + return PAM_AUTH_ERR; + } + lstat_ret = fstat(*tfile, &fileinfo); + close(*tfile); + } + + *tfile = -1; + + if ( lstat_ret ) { + pam_syslog(pamh, LOG_ALERT, "Couldn't stat %s", filename); + return PAM_AUTH_ERR; + } + + if ((fileinfo.st_mode & S_IWOTH) || !S_ISREG(fileinfo.st_mode)) { + /* If the file is world writable or is not a + normal file, return error */ + pam_syslog(pamh, LOG_ALERT, + "%s is either world writable or not a normal file", + filename); + return PAM_AUTH_ERR; + } + + if ((*tfile = open(filename, O_RDWR)) == -1) { +#ifndef MAIN + if (errno == EACCES) /* called with insufficient access rights */ + return PAM_IGNORE; +#endif + pam_syslog(pamh, LOG_ALERT, "Error opening %s for update: %m", filename); + + return PAM_AUTH_ERR; + } + +skip_open: + if (lseek(*tfile, (off_t)uid*(off_t)sizeof(*tally), SEEK_SET) == (off_t)-1) { + pam_syslog(pamh, LOG_ALERT, "lseek failed for %s: %m", filename); + if (!preopened) { + close(*tfile); + *tfile = -1; + } + return PAM_AUTH_ERR; + } + + if (!preopened && (ctrl & OPT_SERIALIZE)) { + /* this code is not thread safe as it uses fcntl locks and alarm() + so never use serialize with multithreaded services */ + struct sigaction newsa, oldsa; + unsigned int oldalarm; + int rv; + + memset(&newsa, '\0', sizeof(newsa)); + newsa.sa_handler = alarm_handler; + sigaction(SIGALRM, &newsa, &oldsa); + oldalarm = alarm(MAX_LOCK_WAITING_TIME); + + rv = lockf(*tfile, F_LOCK, sizeof(*tally)); + /* lock failure is not fatal, we attempt to read the tally anyway */ + + /* reinstate the eventual old alarm handler */ + if (rv == -1 && errno == EINTR) { + if (oldalarm > MAX_LOCK_WAITING_TIME) { + oldalarm -= MAX_LOCK_WAITING_TIME; + } else if (oldalarm > 0) { + oldalarm = 1; + } + } + sigaction(SIGALRM, &oldsa, NULL); + alarm(oldalarm); + } + + if (pam_modutil_read(*tfile, void_tally, sizeof(*tally)) != sizeof(*tally)) { + memset(tally, 0, sizeof(*tally)); + } + + tally->fail_line[sizeof(tally->fail_line)-1] = '\0'; + + return PAM_SUCCESS; +} + +/*---------------------------------------------------------------------*/ + +/* --- Support function: update tallyfile with tally!=TALLY_HI --- */ + +static int +set_tally(pam_handle_t *pamh, uid_t uid, + const char *filename, int *tfile, struct tallylog *tally) +{ + void *void_tally = tally; + if (tally->fail_cnt != TALLY_HI) { + if (lseek(*tfile, (off_t)uid * sizeof(*tally), SEEK_SET) == (off_t)-1) { + pam_syslog(pamh, LOG_ALERT, "lseek failed for %s: %m", filename); + return PAM_AUTH_ERR; + } + if (pam_modutil_write(*tfile, void_tally, sizeof(*tally)) != sizeof(*tally)) { + pam_syslog(pamh, LOG_ALERT, "update (write) failed for %s: %m", filename); + return PAM_AUTH_ERR; + } + } + + if (fsync(*tfile)) { + pam_syslog(pamh, LOG_ALERT, "update (fsync) failed for %s: %m", filename); + return PAM_AUTH_ERR; + } + return PAM_SUCCESS; +} + +/*---------------------------------------------------------------------*/ + +/* --- PAM bits --- */ + +#ifndef MAIN + +#define RETURN_ERROR(i) return ((opts->ctrl & OPT_FAIL_ON_ERROR)?(i):(PAM_SUCCESS)) + +/*---------------------------------------------------------------------*/ + +static int +tally_check (tally_t oldcnt, time_t oldtime, pam_handle_t *pamh, uid_t uid, + const char *user, struct tally_options *opts, + struct tallylog *tally) +{ + int rv = PAM_SUCCESS; + int loglevel = LOG_DEBUG; +#ifdef HAVE_LIBAUDIT + char buf[64]; + int audit_fd = -1; + const void *rhost = NULL, *tty = NULL; +#endif + + if ((opts->ctrl & OPT_MAGIC_ROOT) && getuid() == 0) { + return PAM_SUCCESS; + } + /* magic_root skips tally check */ +#ifdef HAVE_LIBAUDIT + audit_fd = audit_open(); + /* If there is an error & audit support is in the kernel report error */ + if ((audit_fd < 0) && !(errno == EINVAL || errno == EPROTONOSUPPORT || + errno == EAFNOSUPPORT)) + return PAM_SYSTEM_ERR; + (void)pam_get_item(pamh, PAM_TTY, &tty); + (void)pam_get_item(pamh, PAM_RHOST, &rhost); +#endif + if (opts->deny != 0 && /* deny==0 means no deny */ + tally->fail_cnt > opts->deny && /* tally>deny means exceeded */ + ((opts->ctrl & OPT_DENY_ROOT) || uid)) { /* even_deny stops uid check */ +#ifdef HAVE_LIBAUDIT + if (tally->fail_cnt == opts->deny+1) { + /* First say that max number was hit. */ + snprintf(buf, sizeof(buf), "pam_tally2 uid=%u ", uid); + audit_log_user_message(audit_fd, AUDIT_ANOM_LOGIN_FAILURES, buf, + rhost, NULL, tty, 1); + } +#endif + if (uid) { + /* Unlock time check */ + if (opts->unlock_time && oldtime) { + if (opts->unlock_time + oldtime <= time(NULL)) { + /* ignore deny check after unlock_time elapsed */ +#ifdef HAVE_LIBAUDIT + snprintf(buf, sizeof(buf), "pam_tally2 uid=%u ", uid); + audit_log_user_message(audit_fd, AUDIT_RESP_ACCT_UNLOCK_TIMED, buf, + rhost, NULL, tty, 1); +#endif + rv = PAM_SUCCESS; + goto cleanup; + } + } + } else { + /* Root unlock time check */ + if (opts->root_unlock_time && oldtime) { + if (opts->root_unlock_time + oldtime <= time(NULL)) { + /* ignore deny check after unlock_time elapsed */ +#ifdef HAVE_LIBAUDIT + snprintf(buf, sizeof(buf), "pam_tally2 uid=%u ", uid); + audit_log_user_message(audit_fd, AUDIT_RESP_ACCT_UNLOCK_TIMED, buf, + rhost, NULL, tty, 1); +#endif + rv = PAM_SUCCESS; + goto cleanup; + } + } + } + +#ifdef HAVE_LIBAUDIT + if (tally->fail_cnt == opts->deny+1) { + /* First say that max number was hit. */ + audit_log_user_message(audit_fd, AUDIT_RESP_ACCT_LOCK, buf, + rhost, NULL, tty, 1); + } +#endif + + if (!(opts->ctrl & OPT_QUIET)) { + pam_info(pamh, _("Account locked due to %u failed logins"), + (unsigned int)tally->fail_cnt); + } + loglevel = LOG_NOTICE; + rv = PAM_AUTH_ERR; /* Only unconditional failure */ + goto cleanup; + } + + /* Lock time check */ + if (opts->lock_time && oldtime) { + if (opts->lock_time + oldtime > time(NULL)) { + /* don't increase fail_cnt or update fail_time when + lock_time applies */ + tally->fail_cnt = oldcnt; + tally->fail_time = oldtime; + + if (!(opts->ctrl & OPT_QUIET)) { + pam_info(pamh, _("Account temporary locked (%ld seconds left)"), + oldtime+opts->lock_time-time(NULL)); + } + if (!(opts->ctrl & OPT_NOLOGNOTICE)) { + pam_syslog(pamh, LOG_NOTICE, + "user %s (%lu) has time limit [%lds left]" + " since last failure.", + user, (unsigned long)uid, + oldtime+opts->lock_time-time(NULL)); + } + rv = PAM_AUTH_ERR; + goto cleanup; + } + } + +cleanup: + if (!(opts->ctrl & OPT_NOLOGNOTICE) && (loglevel != LOG_DEBUG || opts->ctrl & OPT_DEBUG)) { + pam_syslog(pamh, loglevel, + "user %s (%lu) tally %hu, deny %hu", + user, (unsigned long)uid, tally->fail_cnt, opts->deny); + } +#ifdef HAVE_LIBAUDIT + if (audit_fd != -1) { + close(audit_fd); + } +#endif + return rv; +} + +/* --- tally bump function: bump tally for uid by (signed) inc --- */ + +static int +tally_bump (int inc, time_t *oldtime, pam_handle_t *pamh, + uid_t uid, const char *user, struct tally_options *opts, int *tfile) +{ + struct tallylog tally; + tally_t oldcnt; + const void *remote_host = NULL; + int i, rv; + + tally.fail_cnt = 0; /* !TALLY_HI --> Log opened for update */ + + i = get_tally(pamh, uid, opts->filename, tfile, &tally, opts->ctrl); + if (i != PAM_SUCCESS) { + if (*tfile != -1) { + close(*tfile); + *tfile = -1; + } + RETURN_ERROR(i); + } + + /* to remember old fail time (for locktime) */ + if (oldtime) { + *oldtime = (time_t)tally.fail_time; + } + + tally.fail_time = time(NULL); + + (void) pam_get_item(pamh, PAM_RHOST, &remote_host); + if (!remote_host) { + (void) pam_get_item(pamh, PAM_TTY, &remote_host); + if (!remote_host) { + remote_host = "unknown"; + } + } + + strncpy(tally.fail_line, remote_host, + sizeof(tally.fail_line)-1); + tally.fail_line[sizeof(tally.fail_line)-1] = 0; + + oldcnt = tally.fail_cnt; + + if (!(opts->ctrl & OPT_MAGIC_ROOT) || getuid()) { + /* magic_root doesn't change tally */ + tally.fail_cnt += inc; + + if (tally.fail_cnt == TALLY_HI) { /* Overflow *and* underflow. :) */ + tally.fail_cnt -= inc; + pam_syslog(pamh, LOG_ALERT, "Tally %sflowed for user %s", + (inc<0)?"under":"over",user); + } + } + + rv = tally_check(oldcnt, *oldtime, pamh, uid, user, opts, &tally); + + i = set_tally(pamh, uid, opts->filename, tfile, &tally); + if (i != PAM_SUCCESS) { + if (*tfile != -1) { + close(*tfile); + *tfile = -1; + } + if (rv == PAM_SUCCESS) + RETURN_ERROR( i ); + /* fallthrough */ + } else if (!(opts->ctrl & OPT_SERIALIZE)) { + close(*tfile); + *tfile = -1; + } + + return rv; +} + +static int +tally_reset (pam_handle_t *pamh, uid_t uid, struct tally_options *opts, int old_tfile) +{ + struct tallylog tally; + int tfile = old_tfile; + int i; + + /* resets only if not magic root */ + + if ((opts->ctrl & OPT_MAGIC_ROOT) && getuid() == 0) { + return PAM_SUCCESS; + } + + tally.fail_cnt = 0; /* !TALLY_HI --> Log opened for update */ + + i=get_tally(pamh, uid, opts->filename, &tfile, &tally, opts->ctrl); + if (i != PAM_SUCCESS) { + if (tfile != old_tfile) /* the descriptor is not owned by pam data */ + close(tfile); + RETURN_ERROR(i); + } + + memset(&tally, 0, sizeof(tally)); + + i=set_tally(pamh, uid, opts->filename, &tfile, &tally); + if (i != PAM_SUCCESS) { + if (tfile != old_tfile) /* the descriptor is not owned by pam data */ + close(tfile); + RETURN_ERROR(i); + } + + if (tfile != old_tfile) + close(tfile); + + return PAM_SUCCESS; +} + +/*---------------------------------------------------------------------*/ + +/* --- authentication management functions (only) --- */ + +int +pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int + rv, tfile = -1; + time_t + oldtime = 0; + struct tally_options + options, *opts = &options; + uid_t + uid; + const char + *user; + + rv = tally_parse_args(pamh, opts, PHASE_AUTH, argc, argv); + if (rv != PAM_SUCCESS) + RETURN_ERROR(rv); + + if (flags & PAM_SILENT) + opts->ctrl |= OPT_QUIET; + + rv = pam_get_uid(pamh, &uid, &user, opts); + if (rv != PAM_SUCCESS) + RETURN_ERROR(rv); + + rv = tally_bump(1, &oldtime, pamh, uid, user, opts, &tfile); + + tally_set_data(pamh, oldtime, tfile); + + return rv; +} + +int +pam_sm_setcred(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int + rv, tfile = -1; + time_t + oldtime = 0; + struct tally_options + options, *opts = &options; + uid_t + uid; + const char + *user; + + rv = tally_parse_args(pamh, opts, PHASE_AUTH, argc, argv); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + rv = pam_get_uid(pamh, &uid, &user, opts); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + if ( tally_get_data(pamh, &oldtime, &tfile) != 0 ) + /* no data found */ + return PAM_SUCCESS; + + rv = tally_reset(pamh, uid, opts, tfile); + + pam_set_data(pamh, MODULE_NAME, NULL, NULL); + + return rv; +} + +/*---------------------------------------------------------------------*/ + +/* --- authentication management functions (only) --- */ + +/* To reset failcount of user on successfull login */ + +int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int + rv, tfile = -1; + time_t + oldtime = 0; + struct tally_options + options, *opts = &options; + uid_t + uid; + const char + *user; + + rv = tally_parse_args(pamh, opts, PHASE_ACCOUNT, argc, argv); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + rv = pam_get_uid(pamh, &uid, &user, opts); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + if ( tally_get_data(pamh, &oldtime, &tfile) != 0 ) + /* no data found */ + return PAM_SUCCESS; + + rv = tally_reset(pamh, uid, opts, tfile); + + pam_set_data(pamh, MODULE_NAME, NULL, NULL); + + return rv; +} + +/*-----------------------------------------------------------------------*/ + +#else /* #ifndef MAIN */ + +static const char *cline_filename = DEFAULT_LOGFILE; +static tally_t cline_reset = TALLY_HI; /* Default is `interrogate only' */ +static int cline_quiet = 0; + +/* + * Not going to link with pamlib just for these.. :) + */ + +static const char * +pam_errors( int i ) +{ + switch (i) { + case PAM_AUTH_ERR: return _("Authentication error"); + case PAM_SERVICE_ERR: return _("Service error"); + case PAM_USER_UNKNOWN: return _("Unknown user"); + default: return _("Unknown error"); + } +} + +static int +getopts( char **argv ) +{ + const char *pname = *argv; + for ( ; *argv ; (void)(*argv && ++argv) ) { + if ( !strcmp (*argv,"--file") ) cline_filename=*++argv; + else if ( !strcmp(*argv,"-f") ) cline_filename=*++argv; + else if ( !strncmp(*argv,"--file=",7) ) cline_filename=*argv+7; + else if ( !strcmp (*argv,"--user") ) cline_user=*++argv; + else if ( !strcmp (*argv,"-u") ) cline_user=*++argv; + else if ( !strncmp(*argv,"--user=",7) ) cline_user=*argv+7; + else if ( !strcmp (*argv,"--reset") ) cline_reset=0; + else if ( !strcmp (*argv,"-r") ) cline_reset=0; + else if ( !strncmp(*argv,"--reset=",8)) { + if ( sscanf(*argv+8,"%hu",&cline_reset) != 1 ) + fprintf(stderr,_("%s: Bad number given to --reset=\n"),pname), exit(0); + } + else if ( !strcmp (*argv,"--quiet") ) cline_quiet=1; + else { + fprintf(stderr,_("%s: Unrecognised option %s\n"),pname,*argv); + return FALSE; + } + } + return TRUE; +} + +static void +print_one(const struct tallylog *tally, uid_t uid) +{ + static int once; + char *cp = "[UNKNOWN]"; + time_t fail_time; + struct tm *tm; + struct passwd *pwent; + const char *username = "[NONAME]"; + char ptime[80]; + + pwent = getpwuid(uid); + fail_time = tally->fail_time; + if ((tm = localtime(&fail_time)) != NULL) { + strftime (ptime, sizeof (ptime), "%D %H:%M:%S", tm); + cp = ptime; + } + if (pwent) { + username = pwent->pw_name; + } + if (!once) { + printf (_("Login Failures Latest failure From\n")); + once++; + } + printf ("%-15.15s %5hu ", username, tally->fail_cnt); + if (tally->fail_time) { + printf ("%-17.17s %s", cp, tally->fail_line); + } + putchar ('\n'); +} + +int +main( int argc UNUSED, char **argv ) +{ + struct tallylog tally; + + if ( ! getopts( argv+1 ) ) { + printf(_("%s: [-f rooted-filename] [--file rooted-filename]\n" + " [-u username] [--user username]\n" + " [-r] [--reset[=n]] [--quiet]\n"), + *argv); + exit(2); + } + + umask(077); + + /* + * Major difference between individual user and all users: + * --user just handles one user, just like PAM. + * without --user it handles all users, sniffing cline_filename for nonzeros + */ + + if ( cline_user ) { + uid_t uid; + int tfile = -1; + struct tally_options opts; + int i; + + memset(&opts, 0, sizeof(opts)); + opts.ctrl = OPT_AUDIT; + i=pam_get_uid(NULL, &uid, NULL, &opts); + if ( i != PAM_SUCCESS ) { + fprintf(stderr,"%s: %s\n",*argv,pam_errors(i)); + exit(1); + } + + if (cline_reset == 0) { + struct stat st; + + if (stat(cline_filename, &st) && errno == ENOENT) { + if (!cline_quiet) { + memset(&tally, 0, sizeof(tally)); + print_one(&tally, uid); + } + return 0; /* no file => nothing to reset */ + } + } + + i=get_tally(NULL, uid, cline_filename, &tfile, &tally, 0); + if ( i != PAM_SUCCESS ) { + if (tfile != -1) + close(tfile); + fprintf(stderr, "%s: %s\n", *argv, pam_errors(i)); + exit(1); + } + + if ( !cline_quiet ) + print_one(&tally, uid); + + if (cline_reset != TALLY_HI) { +#ifdef HAVE_LIBAUDIT + char buf[64]; + int audit_fd = audit_open(); + snprintf(buf, sizeof(buf), "pam_tally2 uid=%u reset=%hu", uid, cline_reset); + audit_log_user_message(audit_fd, AUDIT_USER_ACCT, + buf, NULL, NULL, ttyname(STDIN_FILENO), 1); + if (audit_fd >=0) + close(audit_fd); +#endif + if (cline_reset == 0) { + memset(&tally, 0, sizeof(tally)); + } else { + tally.fail_cnt = cline_reset; + } + i=set_tally(NULL, uid, cline_filename, &tfile, &tally); + close(tfile); + if (i != PAM_SUCCESS) { + fprintf(stderr,"%s: %s\n",*argv,pam_errors(i)); + exit(1); + } + } else { + close(tfile); + } + } + else /* !cline_user (ie, operate on all users) */ { + FILE *tfile=fopen(cline_filename, "r"); + uid_t uid=0; + if (!tfile && cline_reset != 0) { + perror(*argv); + exit(1); + } + + for ( ; tfile && !feof(tfile); uid++ ) { + if ( !fread(&tally, sizeof(tally), 1, tfile) + || !tally.fail_cnt ) { + continue; + } + print_one(&tally, uid); + } + if (tfile) + fclose(tfile); + if ( cline_reset!=0 && cline_reset!=TALLY_HI ) { + fprintf(stderr,_("%s: Can't reset all users to non-zero\n"),*argv); + } + else if ( !cline_reset ) { +#ifdef HAVE_LIBAUDIT + char buf[64]; + int audit_fd = audit_open(); + snprintf(buf, sizeof(buf), "pam_tally2 uid=all reset=0"); + audit_log_user_message(audit_fd, AUDIT_USER_ACCT, + buf, NULL, NULL, ttyname(STDIN_FILENO), 1); + if (audit_fd >=0) + close(audit_fd); +#endif + tfile=fopen(cline_filename, "w"); + if ( !tfile ) perror(*argv), exit(0); + fclose(tfile); + } + } + return 0; +} + + +#endif /* #ifndef MAIN */ |