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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:37:38 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:37:38 +0000 |
commit | ae581a19fbe896a797450b9d9573fb66f2735227 (patch) | |
tree | 56c40be8518a29c9351364d13a9676aa83932dc0 /plugins/sudoers/tsdump.c | |
parent | Initial commit. (diff) | |
download | sudo-upstream.tar.xz sudo-upstream.zip |
Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | plugins/sudoers/tsdump.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/plugins/sudoers/tsdump.c b/plugins/sudoers/tsdump.c new file mode 100644 index 0000000..abe56e8 --- /dev/null +++ b/plugins/sudoers/tsdump.c @@ -0,0 +1,311 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2018-2020 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <fcntl.h> +#include <pwd.h> +#include <time.h> +#include <unistd.h> + +#include "sudoers.h" +#include "check.h" + +struct timestamp_entry_common { + unsigned short version; /* version number */ + unsigned short size; /* entry size */ + unsigned short type; /* TS_GLOBAL, TS_TTY, TS_PPID */ + unsigned short flags; /* TS_DISABLED, TS_ANYUID */ +}; + +union timestamp_entry_storage { + struct timestamp_entry_common common; + struct timestamp_entry_v1 v1; + struct timestamp_entry v2; +}; + +sudo_dso_public int main(int argc, char *argv[]); + +static void dump_entry(struct timestamp_entry *entry, off_t pos); +static bool valid_entry(union timestamp_entry_storage *u, off_t pos); +static bool convert_entry(union timestamp_entry_storage *record, struct timespec *off); +sudo_noreturn static void usage(void); + +/* + * tsdump: a simple utility to dump the contents of a time stamp file. + * Unlock sudo, does not perform any locking of the time stamp file. + */ + +int +main(int argc, char *argv[]) +{ + int ch, fd; + const char *user = NULL; + char *fname = NULL; + union timestamp_entry_storage cur; + struct timespec now, timediff; + debug_decl(main, SUDOERS_DEBUG_MAIN); + +#if defined(SUDO_DEVEL) && defined(__OpenBSD__) + malloc_options = "S"; +#endif + + initprogname(argc > 0 ? argv[0] : "tsdump"); + + bindtextdomain("sudoers", LOCALEDIR); + textdomain("sudoers"); + + /* Initialize the debug subsystem. */ + if (sudo_conf_read(NULL, SUDO_CONF_DEBUG) == -1) + exit(EXIT_FAILURE); + sudoers_debug_register(getprogname(), sudo_conf_debug_files(getprogname())); + + while ((ch = getopt(argc, argv, "f:u:")) != -1) { + switch (ch) { + case 'f': + fname = optarg; + break; + case 'u': + user = optarg; + break; + default: + usage(); + } + } + argc -= optind; + argv += optind; + + if (fname != NULL && user != NULL) { + sudo_warnx("the -f and -u flags are mutually exclusive"); + usage(); + } + + /* Calculate the difference between real time and mono time. */ + if (sudo_gettime_real(&now) == -1) + sudo_fatal("unable to get current time"); + if (sudo_gettime_mono(&timediff) == -1) + sudo_fatal("unable to read the clock"); + sudo_timespecsub(&now, &timediff, &timediff); + + if (fname == NULL) { + struct passwd *pw; + + if (user == NULL) { + if ((pw = getpwuid(geteuid())) == NULL) + sudo_fatalx(U_("unknown uid %u"), (unsigned int)geteuid()); + user = pw->pw_name; + } + if (asprintf(&fname, "%s/%s", _PATH_SUDO_TIMEDIR, user) == -1) + sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + } + + fd = open(fname, O_RDONLY); + if (fd == -1) + sudo_fatal(U_("unable to open %s"), fname); + + for (;;) { + off_t pos = lseek(fd, 0, SEEK_CUR); + ssize_t nread; + bool valid; + + if ((nread = read(fd, &cur, sizeof(cur))) == 0) + break; + if (nread == -1) + sudo_fatal(U_("unable to read %s"), fname); + + valid = valid_entry(&cur, pos); + if (cur.common.size != 0 && cur.common.size != sizeof(cur)) { + off_t offset = (off_t)cur.common.size - (off_t)sizeof(cur); + if (lseek(fd, offset, SEEK_CUR) == -1) + sudo_fatal("unable to seek %d bytes", (int)offset); + } + if (valid) { + /* Convert entry to latest version as needed. */ + if (!convert_entry(&cur, &timediff)) + continue; + dump_entry(&cur.v2, pos); + } + } + + return 0; +} + +static bool +valid_entry(union timestamp_entry_storage *u, off_t pos) +{ + struct timestamp_entry *entry = (struct timestamp_entry *)u; + debug_decl(valid_entry, SUDOERS_DEBUG_UTIL); + + switch (entry->version) { + case 1: + if (entry->size != sizeof(struct timestamp_entry_v1)) { + printf("wrong sized v1 record @ %lld, got %hu, expected %zu\n", + (long long)pos, entry->size, sizeof(struct timestamp_entry_v1)); + debug_return_bool(false); + } + break; + case 2: + if (entry->size != sizeof(struct timestamp_entry)) { + printf("wrong sized v2 record @ %lld, got %hu, expected %zu\n", + (long long)pos, entry->size, sizeof(struct timestamp_entry)); + debug_return_bool(false); + } + break; + default: + printf("unknown time stamp entry version %d @ %lld\n", + (int)entry->version, (long long)pos); + debug_return_bool(false); + break; + } + debug_return_bool(true); +} + +static char * +type2string(int type) +{ + static char name[64]; + debug_decl(type2string, SUDOERS_DEBUG_UTIL); + + switch (type) { + case TS_LOCKEXCL: + debug_return_str("TS_LOCKEXCL"); + case TS_GLOBAL: + debug_return_str("TS_GLOBAL"); + case TS_TTY: + debug_return_str("TS_TTY"); + case TS_PPID: + debug_return_str("TS_PPID"); + } + (void)snprintf(name, sizeof(name), "UNKNOWN (0x%x)", type); + debug_return_str(name); +} + +static void +print_flags(int flags) +{ + bool first = true; + debug_decl(print_flags, SUDOERS_DEBUG_UTIL); + + printf("flags: "); + if (ISSET(flags, TS_DISABLED)) { + printf("%sTS_DISABLED", first ? "" : ", "); + CLR(flags, TS_DISABLED); + first = false; + } + if (ISSET(flags, TS_ANYUID)) { + /* TS_ANYUID should never appear on disk. */ + printf("%sTS_ANYUID", first ? "" : ", "); + CLR(flags, TS_ANYUID); + first = false; + } + if (flags != 0) + printf("%s0x%x", first ? "" : ", ", flags); + putchar('\n'); + + debug_return; +} + +/* + * Convert an older entry to current. + * Also adjusts time stamps on Linux to be wallclock time. + */ +static bool +convert_entry(union timestamp_entry_storage *record, struct timespec *off) +{ + union timestamp_entry_storage orig; + debug_decl(convert_entry, SUDOERS_DEBUG_UTIL); + + if (record->common.version != TS_VERSION) { + if (record->common.version != 1) { + sudo_warnx("unexpected record version %hu", record->common.version); + debug_return_bool(false); + } + + /* The first four fields are the same regardless of version. */ + memcpy(&orig, record, sizeof(union timestamp_entry_storage)); + record->v2.auth_uid = orig.v1.auth_uid; + record->v2.sid = orig.v1.sid; + sudo_timespecclear(&record->v2.start_time); + record->v2.ts = orig.v1.ts; + if (record->common.type == TS_TTY) + record->v2.u.ttydev = orig.v1.u.ttydev; + else if (record->common.type == TS_PPID) + record->v2.u.ppid = orig.v1.u.ppid; + else + memset(&record->v2.u, 0, sizeof(record->v2.u)); + } + + /* On Linux, start time is relative to boot time, adjust to real time. */ +#ifdef __linux__ + if (sudo_timespecisset(&record->v2.start_time)) + sudo_timespecadd(&record->v2.start_time, off, &record->v2.start_time); +#endif + + /* Adjust time stamp from mono time to real time. */ + if (sudo_timespecisset(&record->v2.ts)) + sudo_timespecadd(&record->v2.ts, off, &record->v2.ts); + + debug_return_bool(true); +} + +static void +dump_entry(struct timestamp_entry *entry, off_t pos) +{ + debug_decl(dump_entry, SUDOERS_DEBUG_UTIL); + + printf("position: %lld\n", (long long)pos); + printf("version: %hu\n", entry->version); + printf("size: %hu\n", entry->size); + printf("type: %s\n", type2string(entry->type)); + print_flags(entry->flags); + printf("auth uid: %d\n", (int)entry->auth_uid); + printf("session ID: %d\n", (int)entry->sid); + if (sudo_timespecisset(&entry->start_time)) + printf("start time: %s", ctime(&entry->start_time.tv_sec)); + if (sudo_timespecisset(&entry->ts)) + printf("time stamp: %s", ctime(&entry->ts.tv_sec)); + if (entry->type == TS_TTY) { + char tty[PATH_MAX]; + if (sudo_ttyname_dev(entry->u.ttydev, tty, sizeof(tty)) == NULL) + printf("terminal: %d\n", (int)entry->u.ttydev); + else + printf("terminal: %s\n", tty); + } else if (entry->type == TS_PPID) { + printf("parent pid: %d\n", (int)entry->u.ppid); + } + printf("\n"); + + debug_return; +} + +static void +usage(void) +{ + fprintf(stderr, "usage: %s [-f timestamp_file] | [-u username]\n", + getprogname()); + exit(EXIT_FAILURE); +} |