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- Committer: teddy at recompile
- Date: 2020-12-03 20:30:45 UTC
- Revision ID: teddy@recompile.se-20201203203045-iqd6nq9y5nwalh1x
Minor fix of a test function
In dracut-module/password-agent, the test function
test_send_password_to_socket_EMSGSIZE() (which tests that the
send_password_to_socket() task function aborts properly when getting
EMSGSIZE when writing to the password socket), part of the test code
is supposed to find a message size which definitely does trigger
EMSGSIZE when send()ing to a socket. Without a "break" in the proper
place, however, the size given is always exactly 1024 bytes too large.
This is very probably not a problem, since a too large message will
still be too large if it is increased by 1024 bytes, and send(2) in
practice checks the size before reading the buffer. The biggest issue
would be if some version of send(2) would try to look at the last 1024
bytes of the message buffer before checking the message size; this
would then lead to a buffer over-read when running this test function.
(But even then there would be no security implications since the tests
are not run in the normal operation of the program.)
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): Break out early when ssret
< 0 and errno == EMSGSIZE; don't allow loop to increase message_size
again.
In dracut-module/password-agent, the test function
test_send_password_to_socket_EMSGSIZE() (which tests that the
send_password_to_socket() task function aborts properly when getting
EMSGSIZE when writing to the password socket), part of the test code
is supposed to find a message size which definitely does trigger
EMSGSIZE when send()ing to a socket. Without a "break" in the proper
place, however, the size given is always exactly 1024 bytes too large.
This is very probably not a problem, since a too large message will
still be too large if it is increased by 1024 bytes, and send(2) in
practice checks the size before reading the buffer. The biggest issue
would be if some version of send(2) would try to look at the last 1024
bytes of the message buffer before checking the message size; this
would then lead to a buffer over-read when running this test function.
(But even then there would be no security implications since the tests
are not run in the normal operation of the program.)
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): Break out early when ssret
< 0 and errno == EMSGSIZE; don't allow loop to increase message_size
again.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
98
106
99
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
138
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
126
143
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
156
196
/* Malloc check */
157
if(*array == NULL){
197
if(new_array == NULL){
158
198
return false;
159
199
}
200
*array = new_array;
160
201
/* Make a copy of the new string */
161
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
162
206
if(copy == NULL){
163
207
return false;
164
208
}
171
215
}
172
216
173
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
174
219
static bool add_argument(plugin *p, const char *arg){
175
220
if(p == NULL){
176
221
return false;
179
224
}
180
225
181
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
182
228
static bool add_environment(plugin *p, const char *def, bool replace){
183
229
if(p == NULL){
184
230
return false;
186
232
/* namelen = length of name of environment variable */
187
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
234
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
191
237
/* It already exists */
192
238
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
195
244
return false;
196
245
}
197
*e = new;
198
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
199
248
}
200
249
return true;
201
250
}
203
252
return add_to_char_array(def, &(p->environ), &(p->envc));
204
253
}
205
254
255
#ifndef O_CLOEXEC
206
256
/*
207
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
258
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
260
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
264
/* If reading the flags failed, return error indication now. */
215
265
if(ret < 0){
216
266
return ret;
217
267
}
218
268
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
220
271
}
272
#endif /* not O_CLOEXEC */
221
273
222
274
223
275
/* Mark processes as completed when they exit, and save their exit
224
276
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
226
279
while(true){
227
280
plugin *proc = plugin_list;
228
281
int status;
232
285
break;
233
286
}
234
287
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
237
291
}
238
/* No child processes */
239
break;
292
error(0, errno, "waitpid");
240
293
}
241
294
242
295
/* A child exited, find it in process_list */
248
301
continue;
249
302
}
250
303
proc->status = status;
251
proc->completed = true;
304
proc->completed = 1;
252
305
}
306
errno = old_errno;
253
307
}
254
308
255
309
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
257
312
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
313
for(size_t written = 0; written < length; written += (size_t)ret){
262
314
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
315
length - written));
269
321
}
270
322
271
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
272
325
static void free_plugin(plugin *plugin_node){
273
326
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
328
free(*arg);
276
329
}
330
free(plugin_node->name);
277
331
free(plugin_node->argv);
278
332
for(char **env = plugin_node->environ; *env != NULL; env++){
279
333
free(*env);
280
334
}
281
335
free(plugin_node->environ);
282
336
free(plugin_node->buffer);
283
337
284
338
/* Removes the plugin from the singly-linked list */
285
339
if(plugin_node == plugin_list){
286
340
/* First one - simple */
306
360
307
361
int main(int argc, char *argv[]){
308
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
309
364
char *argfile = NULL;
310
365
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
366
struct dirent **direntries = NULL;
314
367
struct stat st;
315
368
fd_set rfds_all;
316
369
int ret, maxfd = 0;
370
ssize_t sret;
317
371
uid_t uid = 65534;
318
372
gid_t gid = 65534;
319
373
bool debug = false;
323
377
.sa_flags = SA_NOCLDSTOP };
324
378
char **custom_argv = NULL;
325
379
int custom_argc = 0;
380
int dir_fd = -1;
326
381
327
382
/* Establish a signal handler */
328
383
sigemptyset(&sigchld_action.sa_mask);
329
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
385
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
333
388
goto fallback;
334
389
}
335
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
391
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
339
394
goto fallback;
340
395
}
341
396
373
428
.doc = "Group ID the plugins will run as", .group = 3 },
374
429
{ .name = "debug", .key = 132,
375
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
376
444
{ .name = NULL }
377
445
};
378
446
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
382
453
case 'g': /* --global-options */
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
392
459
}
393
460
}
461
errno = 0;
394
462
}
395
463
break;
396
464
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
408
467
}
409
468
break;
410
469
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
430
491
}
431
492
break;
432
493
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
436
494
{
437
495
char *envdef = strchr(arg, ':');
438
496
if(envdef == NULL){
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
445
502
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
448
510
}
449
511
}
450
512
break;
451
513
case 'd': /* --disable */
452
if (arg != NULL){
514
{
453
515
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
456
519
}
457
p->disabled = true;
458
520
}
459
521
break;
460
522
case 'e': /* --enable */
461
if (arg != NULL){
523
{
462
524
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
465
528
}
466
p->disabled = false;
467
529
}
468
530
break;
469
531
case 128: /* --plugin-dir */
532
free(plugindir);
470
533
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
534
if(plugindir != NULL){
535
errno = 0;
536
}
474
537
break;
475
538
case 129: /* --config-file */
476
539
/* This is already done by parse_opt_config_file() */
477
540
break;
478
541
case 130: /* --userid */
479
uid = (uid_t)strtol(arg, NULL, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
480
551
break;
481
552
case 131: /* --groupid */
482
gid = (gid_t)strtol(arg, NULL, 10);
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
483
562
break;
484
563
case 132: /* --debug */
485
564
debug = true;
486
565
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
487
593
case ARGP_KEY_ARG:
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
492
605
default:
493
606
return ARGP_ERR_UNKNOWN;
494
607
}
495
return 0;
608
return errno; /* Set to 0 at start */
496
609
}
497
610
498
611
/* This option parser is the same as parse_opt() above, except it
499
612
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
504
618
case 'g': /* --global-options */
505
619
case 'G': /* --global-env */
506
620
case 'o': /* --options-for */
510
624
case 128: /* --plugin-dir */
511
625
break;
512
626
case 129: /* --config-file */
627
free(argfile);
513
628
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
516
631
}
517
break;
632
break;
518
633
case 130: /* --userid */
519
634
case 131: /* --groupid */
520
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
521
640
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
641
break;
524
642
default:
525
643
return ARGP_ERR_UNKNOWN;
526
644
}
527
return 0;
645
return errno;
528
646
}
529
647
530
648
struct argp argp = { .options = options,
532
650
.args_doc = "",
533
651
.doc = "Mandos plugin runner -- Run plugins" };
534
652
535
/* Parse using the parse_opt_config_file in order to get the custom
653
/* Parse using parse_opt_config_file() in order to get the custom
536
654
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
538
if (ret == ARGP_ERR_UNKNOWN){
539
fprintf(stderr, "Unknown error while parsing arguments\n");
540
exitstatus = EXIT_FAILURE;
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
541
669
goto fallback;
542
670
}
543
671
545
673
argp.parser = parse_opt;
546
674
547
675
/* Open the configfile if available */
548
if (argfile == NULL){
676
if(argfile == NULL){
549
677
conffp = fopen(AFILE, "r");
550
678
} else {
551
679
conffp = fopen(argfile, "r");
552
}
680
}
553
681
if(conffp != NULL){
554
682
char *org_line = NULL;
555
683
char *p, *arg, *new_arg, *line;
556
684
size_t size = 0;
557
ssize_t sret;
558
685
const char whitespace_delims[] = " \r\t\f\v\n";
559
686
const char comment_delim[] = "#";
560
687
561
688
custom_argc = 1;
562
689
custom_argv = malloc(sizeof(char*) * 2);
563
690
if(custom_argv == NULL){
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
566
693
goto fallback;
567
694
}
568
695
custom_argv[0] = argv[0];
569
696
custom_argv[1] = NULL;
570
697
571
698
/* for each line in the config file, strip whitespace and ignore
572
699
commented text */
573
700
while(true){
575
702
if(sret == -1){
576
703
break;
577
704
}
578
705
579
706
line = org_line;
580
707
arg = strsep(&line, comment_delim);
581
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
584
711
}
585
712
new_arg = strdup(p);
586
713
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
589
716
free(org_line);
590
717
goto fallback;
591
718
}
592
719
593
720
custom_argc += 1;
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
601
744
}
602
745
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
604
747
}
605
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
606
757
free(org_line);
607
758
} else {
608
759
/* Check for harmful errors and go to fallback. Other errors might
609
760
not affect opening plugins */
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
613
764
goto fallback;
614
765
}
615
766
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
618
769
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
621
if (ret == ARGP_ERR_UNKNOWN){
622
fprintf(stderr, "Unknown error while parsing arguments\n");
623
exitstatus = EXIT_FAILURE;
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
624
784
goto fallback;
625
785
}
626
786
}
627
787
628
788
/* Parse actual command line arguments, to let them override the
629
789
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
635
823
}
636
824
637
825
if(debug){
638
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
639
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
828
p->name ? p->name : "Global", p->argc - 1);
641
829
for(char **a = p->argv; *a != NULL; a++){
642
830
fprintf(stderr, "\tArg: %s\n", *a);
643
831
}
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
645
833
for(char **a = p->environ; *a != NULL; a++){
646
834
fprintf(stderr, "\t%s\n", *a);
647
835
}
648
836
}
649
837
}
650
838
651
/* Strip permissions down to nobody */
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
652
868
ret = setuid(uid);
653
if (ret == -1){
654
perror("setuid");
655
}
656
setgid(gid);
657
if (ret == -1){
658
perror("setgid");
659
}
660
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
667
if(dir == NULL){
668
perror("Could not open plugin dir");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
672
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
674
874
{
675
int dir_fd = dirfd(dir);
676
if(dir_fd >= 0){
677
ret = set_cloexec_flag(dir_fd);
678
if(ret < 0){
679
perror("set_cloexec_flag");
680
exitstatus = EXIT_FAILURE;
681
goto fallback;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
682
919
}
683
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
684
931
}
685
932
686
933
FD_ZERO(&rfds_all);
687
934
688
935
/* Read and execute any executable in the plugin directory*/
689
while(true){
690
dirst = readdir(dir);
691
692
/* All directory entries have been processed */
693
if(dirst == NULL){
694
if (errno == EBADF){
695
perror("readdir");
696
exitstatus = EXIT_FAILURE;
697
goto fallback;
698
}
699
break;
700
}
701
702
d_name_len = strlen(dirst->d_name);
703
704
/* Ignore dotfiles, backup files and other junk */
705
{
706
bool bad_name = false;
707
708
const char const *bad_prefixes[] = { ".", "#", NULL };
709
710
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
711
".dpkg-old",
712
".dpkg-divert", NULL };
713
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
714
size_t pre_len = strlen(*pre);
715
if((d_name_len >= pre_len)
716
and strncmp((dirst->d_name), *pre, pre_len) == 0){
717
if(debug){
718
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
719
" with bad prefix %s\n", dirst->d_name, *pre);
720
}
721
bad_name = true;
722
break;
723
}
724
}
725
if(bad_name){
726
continue;
727
}
728
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
729
size_t suf_len = strlen(*suf);
730
if((d_name_len >= suf_len)
731
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
732
== 0)){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad suffix %s\n", dirst->d_name, *suf);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
742
if(bad_name){
743
continue;
744
}
745
}
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
751
continue;
752
}
753
754
ret = stat(filename, &st);
755
if (ret == -1){
756
perror("stat");
757
free(filename);
758
continue;
759
}
760
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
761
952
/* Ignore non-executable files */
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
763
956
if(debug){
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
766
961
}
767
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
768
964
continue;
769
965
}
770
966
771
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
772
968
if(p == NULL){
773
perror("getplugin");
774
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
775
972
continue;
776
973
}
777
974
if(p->disabled){
778
975
if(debug){
779
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
780
dirst->d_name);
977
direntries[i]->d_name);
781
978
}
782
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
783
981
continue;
784
982
}
785
983
{
788
986
if(g != NULL){
789
987
for(char **a = g->argv + 1; *a != NULL; a++){
790
988
if(not add_argument(p, *a)){
791
perror("add_argument");
989
error(0, errno, "add_argument");
792
990
}
793
991
}
794
992
/* Add global environment variables */
795
993
for(char **e = g->environ; *e != NULL; e++){
796
994
if(not add_environment(p, *e, false)){
797
perror("add_environment");
995
error(0, errno, "add_environment");
798
996
}
799
997
}
800
998
}
801
999
}
802
/* If this plugin has any environment variables, we will call
803
using execve and need to duplicate the environment from this
804
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
805
1002
if(p->environ[0] != NULL){
806
1003
for(char **e = environ; *e != NULL; e++){
807
1004
if(not add_environment(p, *e, false)){
808
perror("add_environment");
1005
error(0, errno, "add_environment");
809
1006
}
810
1007
}
811
1008
}
812
1009
813
1010
int pipefd[2];
814
ret = pipe(pipefd);
815
if (ret == -1){
816
perror("pipe");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
820
1032
/* Ask OS to automatic close the pipe on exec */
821
1033
ret = set_cloexec_flag(pipefd[0]);
822
1034
if(ret < 0){
823
perror("set_cloexec_flag");
824
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
825
1040
goto fallback;
826
1041
}
827
1042
ret = set_cloexec_flag(pipefd[1]);
828
1043
if(ret < 0){
829
perror("set_cloexec_flag");
830
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
831
1049
goto fallback;
832
1050
}
1051
#endif /* not O_CLOEXEC */
833
1052
/* Block SIGCHLD until process is safely in process list */
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
835
1056
if(ret < 0){
836
perror("sigprocmask");
837
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
838
1060
goto fallback;
839
1061
}
840
1062
/* Starting a new process to be watched */
841
pid_t pid = fork();
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
842
1067
if(pid == -1){
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
845
1075
goto fallback;
846
1076
}
847
1077
if(pid == 0){
848
1078
/* this is the child process */
849
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
850
1080
if(ret < 0){
851
perror("sigaction");
852
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
853
1083
}
854
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
855
1085
if(ret < 0){
856
perror("sigprocmask");
857
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
858
1088
}
859
1089
860
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
861
1091
if(ret == -1){
862
perror("dup2");
863
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
864
1094
}
865
1095
866
if(dirfd(dir) < 0){
867
/* If dir has no file descriptor, we could not set FD_CLOEXEC
868
above and must now close it manually here. */
869
closedir(dir);
870
}
871
if(p->environ[0] == NULL){
872
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
875
}
876
} else {
877
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
880
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
881
1102
}
882
1103
/* no return */
883
1104
}
884
1105
/* Parent process */
885
1106
close(pipefd[1]); /* Close unused write end of pipe */
886
free(filename);
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
891
1114
if(ret < 0){
892
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
893
1116
}
894
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
895
1119
goto fallback;
896
1120
}
1121
free(direntries[i]);
897
1122
898
1123
new_plugin->pid = pid;
899
1124
new_plugin->fd = pipefd[0];
900
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
901
1131
/* Unblock SIGCHLD so signal handler can be run if this process
902
1132
has already completed */
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
904
1136
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
907
1139
goto fallback;
908
1140
}
909
1141
910
1142
FD_SET(new_plugin->fd, &rfds_all);
911
1143
912
if (maxfd < new_plugin->fd){
1144
if(maxfd < new_plugin->fd){
913
1145
maxfd = new_plugin->fd;
914
1146
}
915
916
1147
}
917
1148
918
closedir(dir);
919
dir = NULL;
920
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
921
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
1156
if(p->pid != 0){
923
1157
break;
928
1162
free_plugin_list();
929
1163
}
930
1164
}
931
1165
932
1166
/* Main loop while running plugins exist */
933
1167
while(plugin_list){
934
1168
fd_set rfds = rfds_all;
935
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
936
if (select_ret == -1){
937
perror("select");
938
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
939
1173
goto fallback;
940
1174
}
941
1175
/* OK, now either a process completed, or something can be read
942
1176
from one of them */
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1177
for(plugin *proc = plugin_list; proc != NULL;){
944
1178
/* Is this process completely done? */
945
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
946
1180
/* Only accept the plugin output if it exited cleanly */
947
1181
if(not WIFEXITED(proc->status)
948
1182
or WEXITSTATUS(proc->status) != 0){
949
1183
/* Bad exit by plugin */
950
1184
951
1185
if(debug){
952
1186
if(WIFEXITED(proc->status)){
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
955
1190
WEXITSTATUS(proc->status));
956
} else if(WIFSIGNALED(proc->status)) {
957
fprintf(stderr, "Plugin %u killed by signal %d\n",
958
(unsigned int) (proc->pid),
959
WTERMSIG(proc->status));
960
} else if(WCOREDUMP(proc->status)){
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
963
1197
}
964
1198
}
965
1199
966
1200
/* Remove the plugin */
967
1201
FD_CLR(proc->fd, &rfds_all);
968
1202
969
1203
/* Block signal while modifying process_list */
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
971
1208
if(ret < 0){
972
perror("sigprocmask");
973
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
974
1211
goto fallback;
975
1212
}
1213
1214
plugin *next_plugin = proc->next;
976
1215
free_plugin(proc);
1216
proc = next_plugin;
1217
977
1218
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
980
1222
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
983
1225
goto fallback;
984
1226
}
985
1227
986
1228
if(plugin_list == NULL){
987
1229
break;
988
1230
}
1231
989
1232
continue;
990
1233
}
991
1234
992
1235
/* This process exited nicely, so print its buffer */
993
1236
994
1237
bool bret = print_out_password(proc->buffer,
995
1238
proc->buffer_length);
996
1239
if(not bret){
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
999
1242
}
1000
1243
goto fallback;
1001
1244
}
1003
1246
/* This process has not completed. Does it have any output? */
1004
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1005
1248
/* This process had nothing to say at this time */
1249
proc = proc->next;
1006
1250
continue;
1007
1251
}
1008
1252
/* Before reading, make the process' data buffer large enough */
1009
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1015
1259
goto fallback;
1016
1260
}
1261
proc->buffer = new_buffer;
1017
1262
proc->buffer_size += BUFFER_SIZE;
1018
1263
}
1019
1264
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
1023
1270
/* Read error from this process; ignore the error */
1271
proc = proc->next;
1024
1272
continue;
1025
1273
}
1026
if(ret == 0){
1274
if(sret == 0){
1027
1275
/* got EOF */
1028
1276
proc->eof = true;
1029
1277
} else {
1030
proc->buffer_length += (size_t) ret;
1278
proc->buffer_length += (size_t) sret;
1031
1279
}
1032
1280
}
1033
1281
}
1034
1035
1282
1283
1036
1284
fallback:
1037
1285
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1039
1288
/* Fallback if all plugins failed, none are found or an error
1040
1289
occured */
1041
1290
bool bret;
1042
1291
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1043
1292
char *passwordbuffer = getpass("Password: ");
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1293
size_t len = strlen(passwordbuffer);
1294
/* Strip trailing newline */
1295
if(len > 0 and passwordbuffer[len-1] == '\n'){
1296
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1297
len--;
1298
}
1299
bret = print_out_password(passwordbuffer, len);
1045
1300
if(not bret){
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1048
1303
}
1049
1304
}
1050
1305
1051
1306
/* Restore old signal handler */
1052
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
1308
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1056
1311
}
1057
1312
1058
1313
if(custom_argv != NULL){
1059
1314
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
1315
free(*arg);
1062
1317
free(custom_argv);
1063
1318
}
1064
1319
1065
if(dir != NULL){
1066
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1067
1324
}
1068
1325
1069
/* Free the process list and kill the processes */
1326
/* Kill the processes */
1070
1327
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
1328
if(p->pid != 0){
1072
1329
close(p->fd);
1073
1330
ret = kill(p->pid, SIGTERM);
1074
1331
if(ret == -1 and errno != ESRCH){
1075
1332
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1333
error(0, errno, "kill");
1077
1334
}
1078
1335
}
1079
1336
}
1080
1337
1081
1338
/* Wait for any remaining child processes to terminate */
1082
do{
1339
do {
1083
1340
ret = wait(NULL);
1084
1341
} while(ret >= 0);
1085
1342
if(errno != ECHILD){
1086
perror("wait");
1343
error(0, errno, "wait");
1087
1344
}
1088
1345
1089
1346
free_plugin_list();
1090
1347
1091
1348
free(plugindir);
1349
free(pluginhelperdir);
1092
1350
free(argfile);
1093
1351
1094
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0