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- Committer: Teddy Hogeborn
- Date: 2024-11-22 20:28:54 UTC
- Revision ID: teddy@recompile.se-20241122202854-dycuf117byxhxl32
mandos-monitor: Avoid debug messages from urwid
Avoid debug messages from urwid. Any logging output before the screen
has been set up will mangle the screen.
* mandos-monitor: When setting up logging, set urwid to only show log
messages of level INFO or above.
(Thanks to an anonymous contributor for reporting this.)
Avoid debug messages from urwid. Any logging output before the screen
has been set up will mangle the screen.
* mandos-monitor: When setting up logging, set urwid to only show log
messages of level INFO or above.
(Thanks to an anonymous contributor for reporting this.)
- 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 © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 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,
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
}
603
759
}
604
760
custom_argv[custom_argc-1] = new_arg;
605
custom_argv[custom_argc] = NULL;
761
custom_argv[custom_argc] = NULL;
606
762
}
607
763
}
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
}
608
772
free(org_line);
609
773
} else {
610
774
/* Check for harmful errors and go to fallback. Other errors might
611
775
not affect opening plugins */
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
615
779
goto fallback;
616
780
}
617
781
}
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
620
784
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;
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;
626
799
goto fallback;
627
800
}
628
801
}
629
802
630
803
/* Parse actual command line arguments, to let them override the
631
804
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;
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
}
637
838
}
638
839
639
840
if(debug){
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
641
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
642
843
p->name ? p->name : "Global", p->argc - 1);
643
844
for(char **a = p->argv; *a != NULL; a++){
644
845
fprintf(stderr, "\tArg: %s\n", *a);
645
846
}
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
647
848
for(char **a = p->environ; *a != NULL; a++){
648
849
fprintf(stderr, "\t%s\n", *a);
649
850
}
650
851
}
651
852
}
652
853
653
/* Strip permissions down to nobody */
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
}
654
892
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 */
893
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
676
898
{
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;
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;
684
943
}
685
944
}
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;
686
955
}
687
956
688
957
FD_ZERO(&rfds_all);
689
958
690
959
/* 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
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
763
976
/* Ignore non-executable files */
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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)){
765
980
if(debug){
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
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);
768
985
}
769
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
770
988
continue;
771
989
}
772
990
773
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
774
992
if(p == NULL){
775
perror("getplugin");
776
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
777
996
continue;
778
997
}
779
998
if(p->disabled){
780
999
if(debug){
781
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
782
dirst->d_name);
1001
direntries[i]->d_name);
783
1002
}
784
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
785
1005
continue;
786
1006
}
787
1007
{
790
1010
if(g != NULL){
791
1011
for(char **a = g->argv + 1; *a != NULL; a++){
792
1012
if(not add_argument(p, *a)){
793
perror("add_argument");
1013
error(0, errno, "add_argument");
794
1014
}
795
1015
}
796
1016
/* Add global environment variables */
797
1017
for(char **e = g->environ; *e != NULL; e++){
798
1018
if(not add_environment(p, *e, false)){
799
perror("add_environment");
1019
error(0, errno, "add_environment");
800
1020
}
801
1021
}
802
1022
}
803
1023
}
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. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
807
1026
if(p->environ[0] != NULL){
808
1027
for(char **e = environ; *e != NULL; e++){
809
1028
if(not add_environment(p, *e, false)){
810
perror("add_environment");
1029
error(0, errno, "add_environment");
811
1030
}
812
1031
}
813
1032
}
814
1033
815
1034
int pipefd[2];
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
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
822
1056
/* Ask OS to automatic close the pipe on exec */
823
1057
ret = set_cloexec_flag(pipefd[0]);
824
1058
if(ret < 0){
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
827
1064
goto fallback;
828
1065
}
829
1066
ret = set_cloexec_flag(pipefd[1]);
830
1067
if(ret < 0){
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
833
1073
goto fallback;
834
1074
}
1075
#endif /* not O_CLOEXEC */
835
1076
/* Block SIGCHLD until process is safely in process list */
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
837
1080
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
840
1084
goto fallback;
841
1085
}
842
1086
/* Starting a new process to be watched */
843
pid_t pid = fork();
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
844
1091
if(pid == -1){
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
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]);
847
1099
goto fallback;
848
1100
}
849
1101
if(pid == 0){
850
1102
/* this is the child process */
851
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
852
1104
if(ret < 0){
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
855
1107
}
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
857
1109
if(ret < 0){
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
860
1112
}
861
1113
862
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
863
1115
if(ret == -1){
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
866
1118
}
867
1119
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
}
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);
883
1126
}
884
1127
/* no return */
885
1128
}
886
1129
/* Parent process */
887
1130
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);
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)));
893
1138
if(ret < 0){
894
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
895
1140
}
896
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
897
1143
goto fallback;
898
1144
}
1145
free(direntries[i]);
899
1146
900
1147
new_plugin->pid = pid;
901
1148
new_plugin->fd = pipefd[0];
902
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
903
1155
/* Unblock SIGCHLD so signal handler can be run if this process
904
1156
has already completed */
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
906
1160
if(ret < 0){
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
909
1163
goto fallback;
910
1164
}
911
1165
912
1166
FD_SET(new_plugin->fd, &rfds_all);
913
1167
914
if (maxfd < new_plugin->fd){
1168
if(maxfd < new_plugin->fd){
915
1169
maxfd = new_plugin->fd;
916
1170
}
917
918
1171
}
919
1172
920
closedir(dir);
921
dir = NULL;
922
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
1178
923
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
924
1180
if(p->pid != 0){
925
1181
break;
930
1186
free_plugin_list();
931
1187
}
932
1188
}
933
1189
934
1190
/* Main loop while running plugins exist */
935
1191
while(plugin_list){
936
1192
fd_set rfds = rfds_all;
937
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
941
1197
goto fallback;
942
1198
}
943
1199
/* OK, now either a process completed, or something can be read
944
1200
from one of them */
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1201
for(plugin *proc = plugin_list; proc != NULL;){
946
1202
/* Is this process completely done? */
947
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
948
1204
/* Only accept the plugin output if it exited cleanly */
949
1205
if(not WIFEXITED(proc->status)
950
1206
or WEXITSTATUS(proc->status) != 0){
951
1207
/* Bad exit by plugin */
952
1208
953
1209
if(debug){
954
1210
if(WIFEXITED(proc->status)){
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
957
1214
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));
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)));
965
1221
}
966
1222
}
967
1223
968
1224
/* Remove the plugin */
969
1225
FD_CLR(proc->fd, &rfds_all);
970
1226
971
1227
/* Block signal while modifying process_list */
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
973
1232
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
976
1235
goto fallback;
977
1236
}
1237
1238
plugin *next_plugin = proc->next;
978
1239
free_plugin(proc);
1240
proc = next_plugin;
1241
979
1242
/* We are done modifying process list, so unblock signal */
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
982
1246
if(ret < 0){
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
985
1249
goto fallback;
986
1250
}
987
1251
988
1252
if(plugin_list == NULL){
989
1253
break;
990
1254
}
1255
991
1256
continue;
992
1257
}
993
1258
994
1259
/* This process exited nicely, so print its buffer */
995
1260
996
1261
bool bret = print_out_password(proc->buffer,
997
1262
proc->buffer_length);
998
1263
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
1001
1266
}
1002
1267
goto fallback;
1003
1268
}
1005
1270
/* This process has not completed. Does it have any output? */
1006
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
1272
/* This process had nothing to say at this time */
1273
proc = proc->next;
1008
1274
continue;
1009
1275
}
1010
1276
/* Before reading, make the process' data buffer large enough */
1011
1277
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;
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;
1017
1283
goto fallback;
1018
1284
}
1285
proc->buffer = new_buffer;
1019
1286
proc->buffer_size += BUFFER_SIZE;
1020
1287
}
1021
1288
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1293
if(sret < 0){
1025
1294
/* Read error from this process; ignore the error */
1295
proc = proc->next;
1026
1296
continue;
1027
1297
}
1028
if(ret == 0){
1298
if(sret == 0){
1029
1299
/* got EOF */
1030
1300
proc->eof = true;
1031
1301
} else {
1032
proc->buffer_length += (size_t) ret;
1302
proc->buffer_length += (size_t) sret;
1033
1303
}
1034
1304
}
1035
1305
}
1036
1037
1306
1307
1038
1308
fallback:
1039
1309
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1041
1312
/* Fallback if all plugins failed, none are found or an error
1042
1313
occured */
1043
1314
bool bret;
1044
1315
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1045
1316
char *passwordbuffer = getpass("Password: ");
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
1047
1324
if(not bret){
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1050
1327
}
1051
1328
}
1052
1329
1053
1330
/* Restore old signal handler */
1054
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1055
1332
if(ret == -1){
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1058
1335
}
1059
1336
1060
1337
if(custom_argv != NULL){
1061
1338
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1062
1339
free(*arg);
1064
1341
free(custom_argv);
1065
1342
}
1066
1343
1067
if(dir != NULL){
1068
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1069
1348
}
1070
1349
1071
/* Free the process list and kill the processes */
1350
/* Kill the processes */
1072
1351
for(plugin *p = plugin_list; p != NULL; p = p->next){
1073
1352
if(p->pid != 0){
1074
1353
close(p->fd);
1075
1354
ret = kill(p->pid, SIGTERM);
1076
1355
if(ret == -1 and errno != ESRCH){
1077
1356
/* Set-uid proccesses might not get closed */
1078
perror("kill");
1357
error(0, errno, "kill");
1079
1358
}
1080
1359
}
1081
1360
}
1082
1361
1083
1362
/* Wait for any remaining child processes to terminate */
1084
do{
1363
do {
1085
1364
ret = wait(NULL);
1086
1365
} while(ret >= 0);
1087
1366
if(errno != ECHILD){
1088
perror("wait");
1367
error(0, errno, "wait");
1089
1368
}
1090
1369
1091
1370
free_plugin_list();
1092
1371
1093
1372
free(plugindir);
1373
free(pluginhelperdir);
1094
1374
free(argfile);
1095
1375
1096
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0