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- Committer: Teddy Hogeborn
- Date: 2021-03-21 18:44:59 UTC
- Revision ID: teddy@recompile.se-20210321184459-467agedq40ajs7ac
Use _FORTIFY_SOURCE=3, supported by GNU C Library version 2.33
* Makefile (FORTIFY): Changed to use "-D_FORTIFY_SOURCE=3".
* Makefile (FORTIFY): Changed to use "-D_FORTIFY_SOURCE=3".
- 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 © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
26
42
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#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() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#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() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
52
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
66
89
67
90
#define BUFFER_SIZE 256
68
91
69
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
70
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
95
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;
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
98
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
81
103
char **environ;
82
104
int envc;
83
105
bool disabled;
84
106
85
107
/* Variables used for running processes*/
86
108
pid_t pid;
87
109
int fd;
89
111
size_t buffer_size;
90
112
size_t buffer_length;
91
113
bool eof;
92
volatile bool completed;
93
volatile int status;
114
volatile sig_atomic_t completed;
115
int status;
94
116
struct plugin *next;
95
117
} plugin;
96
118
97
119
static plugin *plugin_list = NULL;
98
120
99
/* Gets a existing plugin based on name,
121
/* Gets an existing plugin based on name,
100
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
101
124
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))){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
or (p->name and name and (strcmp(p->name, name) == 0))){
106
129
return p;
107
130
}
108
131
}
109
132
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
112
138
return NULL;
113
139
}
114
140
char *copy_name = NULL;
115
141
if(name != NULL){
116
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
117
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
118
149
return NULL;
119
150
}
120
151
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
152
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
157
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
int e = errno;
129
163
free(copy_name);
130
164
free(new_plugin);
165
errno = e;
131
166
return NULL;
132
167
}
133
168
new_plugin->argv[0] = copy_name;
134
169
new_plugin->argv[1] = NULL;
135
170
136
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
137
174
if(new_plugin->environ == NULL){
175
int e = errno;
138
176
free(copy_name);
139
177
free(new_plugin->argv);
140
178
free(new_plugin);
179
errno = e;
141
180
return NULL;
142
181
}
143
182
new_plugin->environ[0] = NULL;
148
187
}
149
188
150
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
151
191
static bool add_to_char_array(const char *new, char ***array,
152
192
int *len){
153
193
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
156
210
/* Malloc check */
157
if(*array == NULL){
211
if(new_array == NULL){
158
212
return false;
159
213
}
214
*array = new_array;
160
215
/* Make a copy of the new string */
161
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
162
220
if(copy == NULL){
163
221
return false;
164
222
}
171
229
}
172
230
173
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
174
233
static bool add_argument(plugin *p, const char *arg){
175
234
if(p == NULL){
176
235
return false;
179
238
}
180
239
181
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
182
242
static bool add_environment(plugin *p, const char *def, bool replace){
183
243
if(p == NULL){
184
244
return false;
186
246
/* namelen = length of name of environment variable */
187
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
248
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
191
251
/* It already exists */
192
252
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
195
258
return false;
196
259
}
197
*e = new;
198
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
199
262
}
200
263
return true;
201
264
}
203
266
return add_to_char_array(def, &(p->environ), &(p->envc));
204
267
}
205
268
269
#ifndef O_CLOEXEC
206
270
/*
207
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
272
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
274
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
278
/* If reading the flags failed, return error indication now. */
215
279
if(ret < 0){
216
280
return ret;
217
281
}
218
282
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
220
285
}
286
#endif /* not O_CLOEXEC */
221
287
222
288
223
289
/* Mark processes as completed when they exit, and save their exit
224
290
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
226
293
while(true){
227
294
plugin *proc = plugin_list;
228
295
int status;
232
299
break;
233
300
}
234
301
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
237
305
}
238
/* No child processes */
239
break;
306
error(0, errno, "waitpid");
240
307
}
241
308
242
309
/* A child exited, find it in process_list */
243
310
while(proc != NULL and proc->pid != pid){
244
311
proc = proc->next;
248
315
continue;
249
316
}
250
317
proc->status = status;
251
proc->completed = true;
318
proc->completed = 1;
252
319
}
320
errno = old_errno;
253
321
}
254
322
255
323
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
257
326
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
327
for(size_t written = 0; written < length; written += (size_t)ret){
262
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
329
length - written));
269
335
}
270
336
271
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
272
339
static void free_plugin(plugin *plugin_node){
273
340
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
342
free(*arg);
276
343
}
344
free(plugin_node->name);
277
345
free(plugin_node->argv);
278
346
for(char **env = plugin_node->environ; *env != NULL; env++){
279
347
free(*env);
280
348
}
281
349
free(plugin_node->environ);
282
350
free(plugin_node->buffer);
283
351
284
352
/* Removes the plugin from the singly-linked list */
285
353
if(plugin_node == plugin_list){
286
354
/* First one - simple */
306
374
307
375
int main(int argc, char *argv[]){
308
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
309
378
char *argfile = NULL;
310
379
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
380
struct dirent **direntries = NULL;
314
381
struct stat st;
315
382
fd_set rfds_all;
316
383
int ret, maxfd = 0;
384
ssize_t sret;
317
385
uid_t uid = 65534;
318
386
gid_t gid = 65534;
319
387
bool debug = false;
323
391
.sa_flags = SA_NOCLDSTOP };
324
392
char **custom_argv = NULL;
325
393
int custom_argc = 0;
394
int dir_fd = -1;
326
395
327
396
/* Establish a signal handler */
328
397
sigemptyset(&sigchld_action.sa_mask);
329
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
399
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
333
402
goto fallback;
334
403
}
335
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
405
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
339
408
goto fallback;
340
409
}
341
410
373
442
.doc = "Group ID the plugins will run as", .group = 3 },
374
443
{ .name = "debug", .key = 132,
375
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
376
458
{ .name = NULL }
377
459
};
378
460
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
382
467
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;
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
392
473
}
393
474
}
475
errno = 0;
394
476
}
395
477
break;
396
478
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
}
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
408
481
}
409
482
break;
410
483
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
430
502
}
431
503
}
504
errno = 0;
432
505
}
433
506
break;
434
507
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
438
508
{
439
509
char *envdef = strchr(arg, ':');
440
510
if(envdef == NULL){
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
447
516
envdef++;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
450
524
}
451
525
}
452
526
break;
453
527
case 'd': /* --disable */
454
if (arg != NULL){
528
{
455
529
plugin *p = getplugin(arg);
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
458
533
}
459
p->disabled = true;
460
534
}
461
535
break;
462
536
case 'e': /* --enable */
463
if (arg != NULL){
537
{
464
538
plugin *p = getplugin(arg);
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
467
542
}
468
p->disabled = false;
469
543
}
470
544
break;
471
545
case 128: /* --plugin-dir */
546
free(plugindir);
472
547
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
476
551
break;
477
552
case 129: /* --config-file */
478
553
/* This is already done by parse_opt_config_file() */
479
554
break;
480
555
case 130: /* --userid */
481
uid = (uid_t)strtol(arg, NULL, 10);
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
482
565
break;
483
566
case 131: /* --groupid */
484
gid = (gid_t)strtol(arg, NULL, 10);
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
485
576
break;
486
577
case 132: /* --debug */
487
578
debug = true;
488
579
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
/*
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
606
*/
489
607
case ARGP_KEY_ARG:
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
608
/* Cryptsetup always passes an argument, which is an empty
609
string if "none" was specified in /etc/crypttab. So if
610
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
494
619
default:
495
620
return ARGP_ERR_UNKNOWN;
496
621
}
497
return 0;
622
return errno; /* Set to 0 at start */
498
623
}
499
624
500
625
/* This option parser is the same as parse_opt() above, except it
501
626
ignores everything but the --config-file option. */
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
506
632
case 'g': /* --global-options */
507
633
case 'G': /* --global-env */
508
634
case 'o': /* --options-for */
512
638
case 128: /* --plugin-dir */
513
639
break;
514
640
case 129: /* --config-file */
641
free(argfile);
515
642
argfile = strdup(arg);
516
if(argfile == NULL){
517
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
518
645
}
519
break;
646
break;
520
647
case 130: /* --userid */
521
648
case 131: /* --groupid */
522
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
523
654
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
525
655
break;
526
656
default:
527
657
return ARGP_ERR_UNKNOWN;
528
658
}
529
return 0;
659
return errno;
530
660
}
531
661
532
662
struct argp argp = { .options = options,
534
664
.args_doc = "",
535
665
.doc = "Mandos plugin runner -- Run plugins" };
536
666
537
/* Parse using the parse_opt_config_file in order to get the custom
667
/* Parse using parse_opt_config_file() in order to get the custom
538
668
config file location, if any. */
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
543
683
goto fallback;
544
684
}
545
685
547
687
argp.parser = parse_opt;
548
688
549
689
/* Open the configfile if available */
550
if (argfile == NULL){
690
if(argfile == NULL){
551
691
conffp = fopen(AFILE, "r");
552
692
} else {
553
693
conffp = fopen(argfile, "r");
554
}
694
}
555
695
if(conffp != NULL){
556
696
char *org_line = NULL;
557
697
char *p, *arg, *new_arg, *line;
558
698
size_t size = 0;
559
ssize_t sret;
560
699
const char whitespace_delims[] = " \r\t\f\v\n";
561
700
const char comment_delim[] = "#";
562
701
563
702
custom_argc = 1;
564
703
custom_argv = malloc(sizeof(char*) * 2);
565
704
if(custom_argv == NULL){
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
568
707
goto fallback;
569
708
}
570
709
custom_argv[0] = argv[0];
571
710
custom_argv[1] = NULL;
572
711
573
712
/* for each line in the config file, strip whitespace and ignore
574
713
commented text */
575
714
while(true){
577
716
if(sret == -1){
578
717
break;
579
718
}
580
719
581
720
line = org_line;
582
721
arg = strsep(&line, comment_delim);
583
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
586
725
}
587
726
new_arg = strdup(p);
588
727
if(new_arg == NULL){
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
591
730
free(org_line);
592
731
goto fallback;
593
732
}
594
733
595
734
custom_argc += 1;
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
603
758
}
604
759
custom_argv[custom_argc-1] = new_arg;
605
custom_argv[custom_argc] = NULL;
760
custom_argv[custom_argc] = NULL;
606
761
}
607
762
}
763
do {
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
766
if(ret == EOF){
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
769
goto fallback;
770
}
608
771
free(org_line);
609
772
} else {
610
773
/* Check for harmful errors and go to fallback. Other errors might
611
774
not affect opening plugins */
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
615
778
goto fallback;
616
779
}
617
780
}
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
620
783
if(custom_argv != NULL){
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
786
NULL, NULL);
787
switch(ret){
788
case 0:
789
break;
790
case ENOMEM:
791
default:
792
errno = ret;
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
795
goto fallback;
796
case EINVAL:
797
exitstatus = EX_CONFIG;
626
798
goto fallback;
627
799
}
628
800
}
629
801
630
802
/* Parse actual command line arguments, to let them override the
631
803
config file */
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
806
NULL, NULL);
807
switch(ret){
808
case 0:
809
break;
810
case ENOMEM:
811
default:
812
errno = ret;
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
815
goto fallback;
816
case EINVAL:
817
exitstatus = EX_USAGE;
818
goto fallback;
819
}
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
637
837
}
638
838
639
839
if(debug){
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
641
841
fprintf(stderr, "Plugin: %s has %d arguments\n",
642
842
p->name ? p->name : "Global", p->argc - 1);
643
843
for(char **a = p->argv; *a != NULL; a++){
644
844
fprintf(stderr, "\tArg: %s\n", *a);
645
845
}
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
846
fprintf(stderr, "...and %d environment variables\n", p->envc);
647
847
for(char **a = p->environ; *a != NULL; a++){
648
848
fprintf(stderr, "\t%s\n", *a);
649
849
}
650
850
}
651
851
}
652
852
653
/* Strip permissions down to nobody */
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
888
if(ret == -1){
889
error(0, errno, "setgid");
890
}
654
891
ret = setuid(uid);
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
892
if(ret == -1){
893
error(0, errno, "setuid");
894
}
895
896
/* Open plugin directory with close_on_exec flag */
676
897
{
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
905
if(dir_fd == -1){
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
908
goto fallback;
909
}
910
911
#ifndef O_CLOEXEC
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
914
if(ret < 0){
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
917
goto fallback;
918
}
919
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
684
942
}
685
943
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
686
954
}
687
955
688
956
FD_ZERO(&rfds_all);
689
957
690
958
/* Read and execute any executable in the plugin directory*/
691
while(true){
692
dirst = readdir(dir);
693
694
/* All directory entries have been processed */
695
if(dirst == NULL){
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
699
goto fallback;
700
}
701
break;
702
}
703
704
d_name_len = strlen(dirst->d_name);
705
706
/* Ignore dotfiles, backup files and other junk */
707
{
708
bool bad_name = false;
709
710
const char const *bad_prefixes[] = { ".", "#", NULL };
711
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
713
".dpkg-old",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
719
if(debug){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
722
}
723
bad_name = true;
724
break;
725
}
726
}
727
if(bad_name){
728
continue;
729
}
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
734
== 0)){
735
if(debug){
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
738
}
739
bad_name = true;
740
break;
741
}
742
}
743
744
if(bad_name){
745
continue;
746
}
747
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
753
continue;
754
}
755
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
759
free(filename);
760
continue;
761
}
762
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
965
continue;
966
}
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
968
if(ret == -1){
969
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
972
continue;
973
}
974
763
975
/* Ignore non-executable files */
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
765
979
if(debug){
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
768
984
}
769
free(filename);
985
close(plugin_fd);
986
free(direntries[i]);
770
987
continue;
771
988
}
772
989
773
plugin *p = getplugin(dirst->d_name);
990
plugin *p = getplugin(direntries[i]->d_name);
774
991
if(p == NULL){
775
perror("getplugin");
776
free(filename);
992
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
777
995
continue;
778
996
}
779
997
if(p->disabled){
780
998
if(debug){
781
999
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
782
dirst->d_name);
1000
direntries[i]->d_name);
783
1001
}
784
free(filename);
1002
close(plugin_fd);
1003
free(direntries[i]);
785
1004
continue;
786
1005
}
787
1006
{
790
1009
if(g != NULL){
791
1010
for(char **a = g->argv + 1; *a != NULL; a++){
792
1011
if(not add_argument(p, *a)){
793
perror("add_argument");
1012
error(0, errno, "add_argument");
794
1013
}
795
1014
}
796
1015
/* Add global environment variables */
797
1016
for(char **e = g->environ; *e != NULL; e++){
798
1017
if(not add_environment(p, *e, false)){
799
perror("add_environment");
1018
error(0, errno, "add_environment");
800
1019
}
801
1020
}
802
1021
}
803
1022
}
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
807
1025
if(p->environ[0] != NULL){
808
1026
for(char **e = environ; *e != NULL; e++){
809
1027
if(not add_environment(p, *e, false)){
810
perror("add_environment");
1028
error(0, errno, "add_environment");
811
1029
}
812
1030
}
813
1031
}
814
1032
815
1033
int pipefd[2];
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
1034
#ifndef O_CLOEXEC
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
1039
if(ret == -1){
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
822
1055
/* Ask OS to automatic close the pipe on exec */
823
1056
ret = set_cloexec_flag(pipefd[0]);
824
1057
if(ret < 0){
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
827
1063
goto fallback;
828
1064
}
829
1065
ret = set_cloexec_flag(pipefd[1]);
830
1066
if(ret < 0){
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
833
1072
goto fallback;
834
1073
}
1074
#endif /* not O_CLOEXEC */
835
1075
/* Block SIGCHLD until process is safely in process list */
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
1078
NULL));
837
1079
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
840
1083
goto fallback;
841
1084
}
842
1085
/* Starting a new process to be watched */
843
pid_t pid = fork();
1086
pid_t pid;
1087
do {
1088
pid = fork();
1089
} while(pid == -1 and errno == EINTR);
844
1090
if(pid == -1){
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
847
1098
goto fallback;
848
1099
}
849
1100
if(pid == 0){
850
1101
/* this is the child process */
851
1102
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
852
1103
if(ret < 0){
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1104
error(0, errno, "sigaction");
1105
_exit(EX_OSERR);
855
1106
}
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
857
1108
if(ret < 0){
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1109
error(0, errno, "sigprocmask");
1110
_exit(EX_OSERR);
860
1111
}
861
1112
862
1113
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
863
1114
if(ret == -1){
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1115
error(0, errno, "dup2");
1116
_exit(EX_OSERR);
866
1117
}
867
1118
868
if(dirfd(dir) < 0){
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
871
closedir(dir);
872
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
883
1125
}
884
1126
/* no return */
885
1127
}
886
1128
/* Parent process */
887
1129
close(pipefd[1]); /* Close unused write end of pipe */
888
free(filename);
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1132
if(new_plugin == NULL){
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1136
NULL)));
893
1137
if(ret < 0){
894
perror("sigprocmask");
1138
error(0, errno, "sigprocmask");
895
1139
}
896
exitstatus = EXIT_FAILURE;
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
897
1142
goto fallback;
898
1143
}
1144
free(direntries[i]);
899
1145
900
1146
new_plugin->pid = pid;
901
1147
new_plugin->fd = pipefd[0];
902
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
903
1154
/* Unblock SIGCHLD so signal handler can be run if this process
904
1155
has already completed */
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
1158
NULL));
906
1159
if(ret < 0){
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
909
1162
goto fallback;
910
1163
}
911
1164
912
1165
FD_SET(new_plugin->fd, &rfds_all);
913
1166
914
if (maxfd < new_plugin->fd){
1167
if(maxfd < new_plugin->fd){
915
1168
maxfd = new_plugin->fd;
916
1169
}
917
918
1170
}
919
1171
920
closedir(dir);
921
dir = NULL;
922
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1176
free_plugin(getplugin(NULL));
1177
923
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
924
1179
if(p->pid != 0){
925
1180
break;
930
1185
free_plugin_list();
931
1186
}
932
1187
}
933
1188
934
1189
/* Main loop while running plugins exist */
935
1190
while(plugin_list){
936
1191
fd_set rfds = rfds_all;
937
1192
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
941
1196
goto fallback;
942
1197
}
943
1198
/* OK, now either a process completed, or something can be read
944
1199
from one of them */
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1200
for(plugin *proc = plugin_list; proc != NULL;){
946
1201
/* Is this process completely done? */
947
if(proc->eof and proc->completed){
1202
if(proc->completed and proc->eof){
948
1203
/* Only accept the plugin output if it exited cleanly */
949
1204
if(not WIFEXITED(proc->status)
950
1205
or WEXITSTATUS(proc->status) != 0){
951
1206
/* Bad exit by plugin */
952
1207
953
1208
if(debug){
954
1209
if(WIFEXITED(proc->status)){
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1211
" status %d\n", proc->name,
1212
(intmax_t) (proc->pid),
957
1213
WEXITSTATUS(proc->status));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
962
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1214
} else if(WIFSIGNALED(proc->status)){
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1216
" signal %d: %s\n", proc->name,
1217
(intmax_t) (proc->pid),
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
965
1220
}
966
1221
}
967
1222
968
1223
/* Remove the plugin */
969
1224
FD_CLR(proc->fd, &rfds_all);
970
1225
971
1226
/* Block signal while modifying process_list */
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1228
(SIG_BLOCK,
1229
&sigchld_action.sa_mask,
1230
NULL));
973
1231
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
976
1234
goto fallback;
977
1235
}
1236
1237
plugin *next_plugin = proc->next;
978
1238
free_plugin(proc);
1239
proc = next_plugin;
1240
979
1241
/* We are done modifying process list, so unblock signal */
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
982
1245
if(ret < 0){
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
985
1248
goto fallback;
986
1249
}
987
1250
988
1251
if(plugin_list == NULL){
989
1252
break;
990
1253
}
1254
991
1255
continue;
992
1256
}
993
1257
994
1258
/* This process exited nicely, so print its buffer */
995
1259
996
1260
bool bret = print_out_password(proc->buffer,
997
1261
proc->buffer_length);
998
1262
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;
1001
1265
}
1002
1266
goto fallback;
1003
1267
}
1005
1269
/* This process has not completed. Does it have any output? */
1006
1270
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
1271
/* This process had nothing to say at this time */
1272
proc = proc->next;
1008
1273
continue;
1009
1274
}
1010
1275
/* Before reading, make the process' data buffer large enough */
1011
1276
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1280
error(0, errno, "malloc");
1281
exitstatus = EX_OSERR;
1017
1282
goto fallback;
1018
1283
}
1284
proc->buffer = new_buffer;
1019
1285
proc->buffer_size += BUFFER_SIZE;
1020
1286
}
1021
1287
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1288
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
proc->buffer
1290
+ proc->buffer_length,
1291
BUFFER_SIZE));
1292
if(sret < 0){
1025
1293
/* Read error from this process; ignore the error */
1294
proc = proc->next;
1026
1295
continue;
1027
1296
}
1028
if(ret == 0){
1297
if(sret == 0){
1029
1298
/* got EOF */
1030
1299
proc->eof = true;
1031
1300
} else {
1032
proc->buffer_length += (size_t) ret;
1301
proc->buffer_length += (size_t) sret;
1033
1302
}
1034
1303
}
1035
1304
}
1036
1037
1305
1306
1038
1307
fallback:
1039
1308
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1309
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1310
and exitstatus != EX_OK)){
1041
1311
/* Fallback if all plugins failed, none are found or an error
1042
1312
occured */
1043
1313
bool bret;
1044
1314
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1045
1315
char *passwordbuffer = getpass("Password: ");
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1316
size_t len = strlen(passwordbuffer);
1317
/* Strip trailing newline */
1318
if(len > 0 and passwordbuffer[len-1] == '\n'){
1319
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1320
len--;
1321
}
1322
bret = print_out_password(passwordbuffer, len);
1047
1323
if(not bret){
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1324
error(0, errno, "print_out_password");
1325
exitstatus = EX_IOERR;
1050
1326
}
1051
1327
}
1052
1328
1053
1329
/* Restore old signal handler */
1054
1330
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1055
1331
if(ret == -1){
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1332
error(0, errno, "sigaction");
1333
exitstatus = EX_OSERR;
1058
1334
}
1059
1335
1060
1336
if(custom_argv != NULL){
1061
1337
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1062
1338
free(*arg);
1064
1340
free(custom_argv);
1065
1341
}
1066
1342
1067
if(dir != NULL){
1068
closedir(dir);
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1069
1347
}
1070
1348
1071
/* Free the process list and kill the processes */
1349
/* Kill the processes */
1072
1350
for(plugin *p = plugin_list; p != NULL; p = p->next){
1073
1351
if(p->pid != 0){
1074
1352
close(p->fd);
1075
1353
ret = kill(p->pid, SIGTERM);
1076
1354
if(ret == -1 and errno != ESRCH){
1077
1355
/* Set-uid proccesses might not get closed */
1078
perror("kill");
1356
error(0, errno, "kill");
1079
1357
}
1080
1358
}
1081
1359
}
1082
1360
1083
1361
/* Wait for any remaining child processes to terminate */
1084
do{
1362
do {
1085
1363
ret = wait(NULL);
1086
1364
} while(ret >= 0);
1087
1365
if(errno != ECHILD){
1088
perror("wait");
1366
error(0, errno, "wait");
1089
1367
}
1090
1368
1091
1369
free_plugin_list();
1092
1370
1093
1371
free(plugindir);
1372
free(pluginhelperdir);
1094
1373
free(argfile);
1095
1374
1096
1375
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0