summaryrefslogtreecommitdiffstats
path: root/plugins/sudoers/tsdump.c
blob: a46a27c05ed957895ba9249f0c81502fffc8d070 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
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 usage(void) __attribute__((__noreturn__));
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);

/*
 * 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);
}