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- Committer: Björn Påhlsson
- Date: 2008-09-03 18:47:50 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 149.
- Revision ID: belorn@braxen-20080903184750-s0k0jrrq0lxiamwh
removed keyring pre-requirement for starting password-request.
Keys will now be imported in run-time to a run-time created keyring
Changed seckey and pubkey to be paths to private and public keys of the pgp encrypted password and gnutls authentication credentials.
Keys will now be imported in run-time to a run-time created keyring
Changed seckey and pubkey to be paths to private and public keys of the pgp encrypted password and gnutls authentication credentials.
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
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
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
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() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
42
26
#include <stddef.h> /* size_t, NULL */
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() */
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() */
63
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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 */
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 */
89
66
90
67
#define BUFFER_SIZE 256
91
68
92
69
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
71
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
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;
98
76
99
77
typedef struct plugin{
100
78
char *name; /* can be NULL or any plugin name */
103
81
char **environ;
104
82
int envc;
105
83
bool disabled;
106
84
107
85
/* Variables used for running processes*/
108
86
pid_t pid;
109
87
int fd;
111
89
size_t buffer_size;
112
90
size_t buffer_length;
113
91
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
92
volatile bool completed;
93
volatile int status;
116
94
struct plugin *next;
117
95
} plugin;
118
96
119
97
static plugin *plugin_list = NULL;
120
98
121
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
122
100
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
101
static plugin *getplugin(char *name){
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))){
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))){
129
106
return p;
130
107
}
131
108
}
132
109
/* Create a new plugin */
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){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
138
112
return NULL;
139
113
}
140
114
char *copy_name = NULL;
141
115
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
145
117
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
118
return NULL;
150
119
}
151
120
}
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;
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){
163
129
free(copy_name);
164
130
free(new_plugin);
165
errno = e;
166
131
return NULL;
167
132
}
168
133
new_plugin->argv[0] = copy_name;
169
134
new_plugin->argv[1] = NULL;
170
135
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
174
137
if(new_plugin->environ == NULL){
175
int e = errno;
176
138
free(copy_name);
177
139
free(new_plugin->argv);
178
140
free(new_plugin);
179
errno = e;
180
141
return NULL;
181
142
}
182
143
new_plugin->environ[0] = NULL;
187
148
}
188
149
189
150
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
151
static bool add_to_char_array(const char *new, char ***array,
192
152
int *len){
193
153
/* Resize the pointed-to array to hold one more pointer */
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);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
210
156
/* Malloc check */
211
if(new_array == NULL){
157
if(*array == NULL){
212
158
return false;
213
159
}
214
*array = new_array;
215
160
/* Make a copy of the new string */
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
220
162
if(copy == NULL){
221
163
return false;
222
164
}
229
171
}
230
172
231
173
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
174
static bool add_argument(plugin *p, const char *arg){
234
175
if(p == NULL){
235
176
return false;
238
179
}
239
180
240
181
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
182
static bool add_environment(plugin *p, const char *def, bool replace){
243
183
if(p == NULL){
244
184
return false;
246
186
/* namelen = length of name of environment variable */
247
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
188
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
251
191
/* It already exists */
252
192
if(replace){
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){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
258
195
return false;
259
196
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
262
199
}
263
200
return true;
264
201
}
266
203
return add_to_char_array(def, &(p->environ), &(p->envc));
267
204
}
268
205
269
#ifndef O_CLOEXEC
270
206
/*
271
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
208
* Descriptor Flags".
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
274
210
*/
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));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
278
214
/* If reading the flags failed, return error indication now. */
279
215
if(ret < 0){
280
216
return ret;
281
217
}
282
218
/* Store modified flag word in the descriptor. */
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
285
220
}
286
#endif /* not O_CLOEXEC */
287
221
288
222
289
223
/* Mark processes as completed when they exit, and save their exit
290
224
status. */
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
293
226
while(true){
294
227
plugin *proc = plugin_list;
295
228
int status;
299
232
break;
300
233
}
301
234
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
235
if (errno != ECHILD){
236
perror("waitpid");
305
237
}
306
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
307
240
}
308
241
309
242
/* A child exited, find it in process_list */
310
243
while(proc != NULL and proc->pid != pid){
311
244
proc = proc->next;
315
248
continue;
316
249
}
317
250
proc->status = status;
318
proc->completed = 1;
251
proc->completed = true;
319
252
}
320
errno = old_errno;
321
253
}
322
254
323
255
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
326
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
327
261
for(size_t written = 0; written < length; written += (size_t)ret){
328
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
329
263
length - written));
335
269
}
336
270
337
271
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
272
static void free_plugin(plugin *plugin_node){
340
273
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
275
free(*arg);
343
276
}
344
free(plugin_node->name);
345
277
free(plugin_node->argv);
346
278
for(char **env = plugin_node->environ; *env != NULL; env++){
347
279
free(*env);
348
280
}
349
281
free(plugin_node->environ);
350
282
free(plugin_node->buffer);
351
283
352
284
/* Removes the plugin from the singly-linked list */
353
285
if(plugin_node == plugin_list){
354
286
/* First one - simple */
374
306
375
307
int main(int argc, char *argv[]){
376
308
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
309
char *argfile = NULL;
379
310
FILE *conffp;
380
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
381
314
struct stat st;
382
315
fd_set rfds_all;
383
316
int ret, maxfd = 0;
384
ssize_t sret;
385
317
uid_t uid = 65534;
386
318
gid_t gid = 65534;
387
319
bool debug = false;
391
323
.sa_flags = SA_NOCLDSTOP };
392
324
char **custom_argv = NULL;
393
325
int custom_argc = 0;
394
int dir_fd = -1;
395
326
396
327
/* Establish a signal handler */
397
328
sigemptyset(&sigchld_action.sa_mask);
398
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
330
if(ret == -1){
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
402
333
goto fallback;
403
334
}
404
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
336
if(ret == -1){
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
408
339
goto fallback;
409
340
}
410
341
442
373
.doc = "Group ID the plugins will run as", .group = 3 },
443
374
{ .name = "debug", .key = 132,
444
375
.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 },
458
376
{ .name = NULL }
459
377
};
460
378
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;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
467
382
case 'g': /* --global-options */
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
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;
473
392
}
474
393
}
475
errno = 0;
476
394
}
477
395
break;
478
396
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
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
}
481
408
}
482
409
break;
483
410
case 'o': /* --options-for */
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;
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
}
502
430
}
503
431
}
504
errno = 0;
505
432
}
506
433
break;
507
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
508
438
{
509
439
char *envdef = strchr(arg, ':');
510
440
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
516
447
envdef++;
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;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
524
450
}
525
451
}
526
452
break;
527
453
case 'd': /* --disable */
528
{
454
if (arg != NULL){
529
455
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
533
458
}
459
p->disabled = true;
534
460
}
535
461
break;
536
462
case 'e': /* --enable */
537
{
463
if (arg != NULL){
538
464
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
542
467
}
468
p->disabled = false;
543
469
}
544
470
break;
545
471
case 128: /* --plugin-dir */
546
free(plugindir);
547
472
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
473
if(plugindir == NULL){
474
perror("strdup");
475
}
551
476
break;
552
477
case 129: /* --config-file */
553
478
/* This is already done by parse_opt_config_file() */
554
479
break;
555
480
case 130: /* --userid */
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;
481
uid = (uid_t)strtol(arg, NULL, 10);
565
482
break;
566
483
case 131: /* --groupid */
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;
484
gid = (gid_t)strtol(arg, NULL, 10);
576
485
break;
577
486
case 132: /* --debug */
578
487
debug = true;
579
488
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
*/
607
489
case ARGP_KEY_ARG:
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
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
619
494
default:
620
495
return ARGP_ERR_UNKNOWN;
621
496
}
622
return errno; /* Set to 0 at start */
497
return 0;
623
498
}
624
499
625
500
/* This option parser is the same as parse_opt() above, except it
626
501
ignores everything but the --config-file option. */
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){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
632
506
case 'g': /* --global-options */
633
507
case 'G': /* --global-env */
634
508
case 'o': /* --options-for */
638
512
case 128: /* --plugin-dir */
639
513
break;
640
514
case 129: /* --config-file */
641
free(argfile);
642
515
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
516
if(argfile == NULL){
517
perror("strdup");
645
518
}
646
break;
519
break;
647
520
case 130: /* --userid */
648
521
case 131: /* --groupid */
649
522
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
655
525
break;
656
526
default:
657
527
return ARGP_ERR_UNKNOWN;
658
528
}
659
return errno;
529
return 0;
660
530
}
661
531
662
532
struct argp argp = { .options = options,
664
534
.args_doc = "",
665
535
.doc = "Mandos plugin runner -- Run plugins" };
666
536
667
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
668
538
config file location, if any. */
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;
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;
683
543
goto fallback;
684
544
}
685
545
687
547
argp.parser = parse_opt;
688
548
689
549
/* Open the configfile if available */
690
if(argfile == NULL){
550
if (argfile == NULL){
691
551
conffp = fopen(AFILE, "r");
692
552
} else {
693
553
conffp = fopen(argfile, "r");
694
}
554
}
695
555
if(conffp != NULL){
696
556
char *org_line = NULL;
697
557
char *p, *arg, *new_arg, *line;
698
558
size_t size = 0;
559
ssize_t sret;
699
560
const char whitespace_delims[] = " \r\t\f\v\n";
700
561
const char comment_delim[] = "#";
701
562
702
563
custom_argc = 1;
703
564
custom_argv = malloc(sizeof(char*) * 2);
704
565
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
707
568
goto fallback;
708
569
}
709
570
custom_argv[0] = argv[0];
710
571
custom_argv[1] = NULL;
711
572
712
573
/* for each line in the config file, strip whitespace and ignore
713
574
commented text */
714
575
while(true){
716
577
if(sret == -1){
717
578
break;
718
579
}
719
580
720
581
line = org_line;
721
582
arg = strsep(&line, comment_delim);
722
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
725
586
}
726
587
new_arg = strdup(p);
727
588
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
730
591
free(org_line);
731
592
goto fallback;
732
593
}
733
594
734
595
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
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;
759
603
}
760
604
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
762
606
}
763
607
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
772
608
free(org_line);
773
609
} else {
774
610
/* Check for harmful errors and go to fallback. Other errors might
775
611
not affect opening plugins */
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
779
615
goto fallback;
780
616
}
781
617
}
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
784
620
if(custom_argv != NULL){
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
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;
799
626
goto fallback;
800
627
}
801
628
}
802
629
803
630
/* Parse actual command line arguments, to let them override the
804
631
config file */
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
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;
838
637
}
839
638
840
639
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
642
p->name ? p->name : "Global", p->argc - 1);
844
643
for(char **a = p->argv; *a != NULL; a++){
845
644
fprintf(stderr, "\tArg: %s\n", *a);
846
645
}
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
848
647
for(char **a = p->environ; *a != NULL; a++){
849
648
fprintf(stderr, "\t%s\n", *a);
850
649
}
851
650
}
852
651
}
853
652
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
653
/* Strip permissions down to nobody */
892
654
ret = setuid(uid);
893
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
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 */
898
676
{
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
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;
943
684
}
944
685
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
955
686
}
956
687
957
688
FD_ZERO(&rfds_all);
958
689
959
690
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
966
continue;
967
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
973
continue;
974
}
975
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
976
763
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
980
765
if(debug){
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
985
768
}
986
close(plugin_fd);
987
free(direntries[i]);
769
free(filename);
988
770
continue;
989
771
}
990
772
991
plugin *p = getplugin(direntries[i]->d_name);
773
plugin *p = getplugin(dirst->d_name);
992
774
if(p == NULL){
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
775
perror("getplugin");
776
free(filename);
996
777
continue;
997
778
}
998
779
if(p->disabled){
999
780
if(debug){
1000
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
782
dirst->d_name);
1002
783
}
1003
close(plugin_fd);
1004
free(direntries[i]);
784
free(filename);
1005
785
continue;
1006
786
}
1007
787
{
1010
790
if(g != NULL){
1011
791
for(char **a = g->argv + 1; *a != NULL; a++){
1012
792
if(not add_argument(p, *a)){
1013
error(0, errno, "add_argument");
793
perror("add_argument");
1014
794
}
1015
795
}
1016
796
/* Add global environment variables */
1017
797
for(char **e = g->environ; *e != NULL; e++){
1018
798
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
799
perror("add_environment");
1020
800
}
1021
801
}
1022
802
}
1023
803
}
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
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. */
1026
807
if(p->environ[0] != NULL){
1027
808
for(char **e = environ; *e != NULL; e++){
1028
809
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
810
perror("add_environment");
1030
811
}
1031
812
}
1032
813
}
1033
814
1034
815
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1040
if(ret == -1){
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
1056
822
/* Ask OS to automatic close the pipe on exec */
1057
823
ret = set_cloexec_flag(pipefd[0]);
1058
824
if(ret < 0){
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1064
827
goto fallback;
1065
828
}
1066
829
ret = set_cloexec_flag(pipefd[1]);
1067
830
if(ret < 0){
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1073
833
goto fallback;
1074
834
}
1075
#endif /* not O_CLOEXEC */
1076
835
/* Block SIGCHLD until process is safely in process list */
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1080
837
if(ret < 0){
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1084
840
goto fallback;
1085
841
}
1086
842
/* Starting a new process to be watched */
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
1091
844
if(pid == -1){
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1099
847
goto fallback;
1100
848
}
1101
849
if(pid == 0){
1102
850
/* this is the child process */
1103
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1104
852
if(ret < 0){
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1107
855
}
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
857
if(ret < 0){
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1112
860
}
1113
861
1114
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1115
863
if(ret == -1){
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1118
866
}
1119
867
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
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
}
1126
883
}
1127
884
/* no return */
1128
885
}
1129
886
/* Parent process */
1130
887
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
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);
1138
893
if(ret < 0){
1139
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1140
895
}
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
896
exitstatus = EXIT_FAILURE;
1143
897
goto fallback;
1144
898
}
1145
free(direntries[i]);
1146
899
1147
900
new_plugin->pid = pid;
1148
901
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
902
1155
903
/* Unblock SIGCHLD so signal handler can be run if this process
1156
904
has already completed */
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1160
906
if(ret < 0){
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1163
909
goto fallback;
1164
910
}
1165
911
1166
912
FD_SET(new_plugin->fd, &rfds_all);
1167
913
1168
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1169
915
maxfd = new_plugin->fd;
1170
916
}
917
1171
918
}
1172
919
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
1178
920
closedir(dir);
921
dir = NULL;
922
1179
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
924
if(p->pid != 0){
1181
925
break;
1186
930
free_plugin_list();
1187
931
}
1188
932
}
1189
933
1190
934
/* Main loop while running plugins exist */
1191
935
while(plugin_list){
1192
936
fd_set rfds = rfds_all;
1193
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1197
941
goto fallback;
1198
942
}
1199
943
/* OK, now either a process completed, or something can be read
1200
944
from one of them */
1201
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1202
946
/* Is this process completely done? */
1203
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1204
948
/* Only accept the plugin output if it exited cleanly */
1205
949
if(not WIFEXITED(proc->status)
1206
950
or WEXITSTATUS(proc->status) != 0){
1207
951
/* Bad exit by plugin */
1208
952
1209
953
if(debug){
1210
954
if(WIFEXITED(proc->status)){
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1214
957
WEXITSTATUS(proc->status));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(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));
1221
965
}
1222
966
}
1223
967
1224
968
/* Remove the plugin */
1225
969
FD_CLR(proc->fd, &rfds_all);
1226
970
1227
971
/* Block signal while modifying process_list */
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1232
973
if(ret < 0){
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1235
976
goto fallback;
1236
977
}
1237
1238
plugin *next_plugin = proc->next;
1239
978
free_plugin(proc);
1240
proc = next_plugin;
1241
1242
979
/* We are done modifying process list, so unblock signal */
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1246
982
if(ret < 0){
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1249
985
goto fallback;
1250
986
}
1251
987
1252
988
if(plugin_list == NULL){
1253
989
break;
1254
990
}
1255
1256
991
continue;
1257
992
}
1258
993
1259
994
/* This process exited nicely, so print its buffer */
1260
995
1261
996
bool bret = print_out_password(proc->buffer,
1262
997
proc->buffer_length);
1263
998
if(not bret){
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1266
1001
}
1267
1002
goto fallback;
1268
1003
}
1270
1005
/* This process has not completed. Does it have any output? */
1271
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1272
1007
/* This process had nothing to say at this time */
1273
proc = proc->next;
1274
1008
continue;
1275
1009
}
1276
1010
/* Before reading, make the process' data buffer large enough */
1277
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
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;
1283
1017
goto fallback;
1284
1018
}
1285
proc->buffer = new_buffer;
1286
1019
proc->buffer_size += BUFFER_SIZE;
1287
1020
}
1288
1021
/* Read from the process */
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1293
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1294
1025
/* Read error from this process; ignore the error */
1295
proc = proc->next;
1296
1026
continue;
1297
1027
}
1298
if(sret == 0){
1028
if(ret == 0){
1299
1029
/* got EOF */
1300
1030
proc->eof = true;
1301
1031
} else {
1302
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1303
1033
}
1304
1034
}
1305
1035
}
1306
1307
1036
1037
1308
1038
fallback:
1309
1039
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1312
1041
/* Fallback if all plugins failed, none are found or an error
1313
1042
occured */
1314
1043
bool bret;
1315
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1316
1045
char *passwordbuffer = getpass("Password: ");
1317
size_t len = strlen(passwordbuffer);
1318
/* Strip trailing newline */
1319
if(len > 0 and passwordbuffer[len-1] == '\n'){
1320
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1321
len--;
1322
}
1323
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1324
1047
if(not bret){
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1327
1050
}
1328
1051
}
1329
1052
1330
1053
/* Restore old signal handler */
1331
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1332
1055
if(ret == -1){
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1335
1058
}
1336
1059
1337
1060
if(custom_argv != NULL){
1338
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1339
1062
free(*arg);
1341
1064
free(custom_argv);
1342
1065
}
1343
1066
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1067
if(dir != NULL){
1068
closedir(dir);
1348
1069
}
1349
1070
1350
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1351
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1352
1073
if(p->pid != 0){
1353
1074
close(p->fd);
1354
1075
ret = kill(p->pid, SIGTERM);
1355
1076
if(ret == -1 and errno != ESRCH){
1356
1077
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1078
perror("kill");
1358
1079
}
1359
1080
}
1360
1081
}
1361
1082
1362
1083
/* Wait for any remaining child processes to terminate */
1363
do {
1084
do{
1364
1085
ret = wait(NULL);
1365
1086
} while(ret >= 0);
1366
1087
if(errno != ECHILD){
1367
error(0, errno, "wait");
1088
perror("wait");
1368
1089
}
1369
1090
1370
1091
free_plugin_list();
1371
1092
1372
1093
free(plugindir);
1373
free(pluginhelperdir);
1374
1094
free(argfile);
1375
1095
1376
1096
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0