To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.7.787
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.787
- Committer: Teddy Hogeborn
- Date: 2021-02-04 17:59:45 UTC
- mto: This revision was merged to the branch mainline in revision 406.
- Revision ID: teddy@recompile.se-20210204175945-8druo6d88ipc1z58
Fix issue with french translation
Initial white space was missing in both msgid and msgstr of the french
translation, leading to checking tools reporing an incomplete
translation. The string is a raw key id, and therefore did not need
translation, so this was never a user-visible issue.
* debian/po/fr.po: Add missing whitespace to the id and translation
for msgid " ${key_id}".
Initial white space was missing in both msgid and msgstr of the french
translation, leading to checking tools reporing an incomplete
translation. The string is a raw key id, and therefore did not need
translation, so this was never a user-visible issue.
* debian/po/fr.po: Add missing whitespace to the id and translation
for msgid " ${key_id}".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
26
42
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
52
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
66
89
67
90
#define BUFFER_SIZE 256
68
91
69
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
70
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
95
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
98
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
81
103
char **environ;
82
104
int envc;
83
105
bool disabled;
84
106
85
107
/* Variables used for running processes*/
86
108
pid_t pid;
87
109
int fd;
89
111
size_t buffer_size;
90
112
size_t buffer_length;
91
113
bool eof;
92
volatile bool completed;
93
volatile int status;
114
volatile sig_atomic_t completed;
115
int status;
94
116
struct plugin *next;
95
117
} plugin;
96
118
97
119
static plugin *plugin_list = NULL;
98
120
99
/* Gets a existing plugin based on name,
121
/* Gets an existing plugin based on name,
100
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
101
124
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
or (p->name and name and (strcmp(p->name, name) == 0))){
106
129
return p;
107
130
}
108
131
}
109
132
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
112
138
return NULL;
113
139
}
114
140
char *copy_name = NULL;
115
141
if(name != NULL){
116
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
117
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
118
149
return NULL;
119
150
}
120
151
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
152
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
157
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
int e = errno;
129
163
free(copy_name);
130
164
free(new_plugin);
165
errno = e;
131
166
return NULL;
132
167
}
133
168
new_plugin->argv[0] = copy_name;
134
169
new_plugin->argv[1] = NULL;
135
170
136
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
137
174
if(new_plugin->environ == NULL){
175
int e = errno;
138
176
free(copy_name);
139
177
free(new_plugin->argv);
140
178
free(new_plugin);
179
errno = e;
141
180
return NULL;
142
181
}
143
182
new_plugin->environ[0] = NULL;
148
187
}
149
188
150
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
151
191
static bool add_to_char_array(const char *new, char ***array,
152
192
int *len){
153
193
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
156
210
/* Malloc check */
157
if(*array == NULL){
211
if(new_array == NULL){
158
212
return false;
159
213
}
214
*array = new_array;
160
215
/* Make a copy of the new string */
161
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
162
220
if(copy == NULL){
163
221
return false;
164
222
}
171
229
}
172
230
173
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
174
233
static bool add_argument(plugin *p, const char *arg){
175
234
if(p == NULL){
176
235
return false;
179
238
}
180
239
181
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
182
242
static bool add_environment(plugin *p, const char *def, bool replace){
183
243
if(p == NULL){
184
244
return false;
186
246
/* namelen = length of name of environment variable */
187
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
248
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
191
251
/* It already exists */
192
252
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
195
258
return false;
196
259
}
197
*e = new;
198
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
199
262
}
200
263
return true;
201
264
}
203
266
return add_to_char_array(def, &(p->environ), &(p->envc));
204
267
}
205
268
269
#ifndef O_CLOEXEC
206
270
/*
207
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
272
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
274
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
278
/* If reading the flags failed, return error indication now. */
215
279
if(ret < 0){
216
280
return ret;
217
281
}
218
282
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
220
285
}
286
#endif /* not O_CLOEXEC */
221
287
222
288
223
289
/* Mark processes as completed when they exit, and save their exit
224
290
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
226
293
while(true){
227
294
plugin *proc = plugin_list;
228
295
int status;
232
299
break;
233
300
}
234
301
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
237
305
}
238
/* No child processes */
239
break;
306
error(0, errno, "waitpid");
240
307
}
241
308
242
309
/* A child exited, find it in process_list */
243
310
while(proc != NULL and proc->pid != pid){
244
311
proc = proc->next;
248
315
continue;
249
316
}
250
317
proc->status = status;
251
proc->completed = true;
318
proc->completed = 1;
252
319
}
320
errno = old_errno;
253
321
}
254
322
255
323
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
257
326
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
327
for(size_t written = 0; written < length; written += (size_t)ret){
262
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
329
length - written));
269
335
}
270
336
271
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
272
339
static void free_plugin(plugin *plugin_node){
273
340
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
342
free(*arg);
276
343
}
344
free(plugin_node->name);
277
345
free(plugin_node->argv);
278
346
for(char **env = plugin_node->environ; *env != NULL; env++){
279
347
free(*env);
280
348
}
281
349
free(plugin_node->environ);
282
350
free(plugin_node->buffer);
283
351
284
352
/* Removes the plugin from the singly-linked list */
285
353
if(plugin_node == plugin_list){
286
354
/* First one - simple */
306
374
307
375
int main(int argc, char *argv[]){
308
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
309
378
char *argfile = NULL;
310
379
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
380
struct dirent **direntries = NULL;
314
381
struct stat st;
315
382
fd_set rfds_all;
316
383
int ret, maxfd = 0;
384
ssize_t sret;
317
385
uid_t uid = 65534;
318
386
gid_t gid = 65534;
319
387
bool debug = false;
323
391
.sa_flags = SA_NOCLDSTOP };
324
392
char **custom_argv = NULL;
325
393
int custom_argc = 0;
394
int dir_fd = -1;
326
395
327
396
/* Establish a signal handler */
328
397
sigemptyset(&sigchld_action.sa_mask);
329
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
399
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
333
402
goto fallback;
334
403
}
335
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
405
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
339
408
goto fallback;
340
409
}
341
410
344
413
{ .name = "global-options", .key = 'g',
345
414
.arg = "OPTION[,OPTION[,...]]",
346
415
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
416
{ .name = "global-env", .key = 'G',
348
417
.arg = "VAR=value",
349
418
.doc = "Environment variable passed to all plugins" },
350
419
{ .name = "options-for", .key = 'o',
351
420
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
421
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
422
{ .name = "env-for", .key = 'E',
354
423
.arg = "PLUGIN:ENV=value",
355
424
.doc = "Environment variable passed to specified plugin" },
356
425
{ .name = "disable", .key = 'd',
357
426
.arg = "PLUGIN",
358
427
.doc = "Disable a specific plugin", .group = 1 },
428
{ .name = "enable", .key = 'e',
429
.arg = "PLUGIN",
430
.doc = "Enable a specific plugin", .group = 1 },
359
431
{ .name = "plugin-dir", .key = 128,
360
432
.arg = "DIRECTORY",
361
433
.doc = "Specify a different plugin directory", .group = 2 },
370
442
.doc = "Group ID the plugins will run as", .group = 3 },
371
443
{ .name = "debug", .key = 132,
372
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 },
373
458
{ .name = NULL }
374
459
};
375
460
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
/* Get the INPUT argument from `argp_parse', which we know is a
379
pointer to our plugin list pointer. */
380
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;
381
467
case 'g': /* --global-options */
382
if (arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
395
case 'e': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
468
{
400
char *envdef = strdup(arg);
401
if(envdef == NULL){
402
break;
403
}
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
406
}
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
473
}
474
}
475
errno = 0;
476
}
477
break;
478
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
407
481
}
408
482
break;
409
483
case 'o': /* --options-for */
410
if (arg != NULL){
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
413
break;
414
}
415
char *opt = strsep(&arg, ":");
416
if(opt[0] == '\0'){
417
break;
418
}
419
if(opt != NULL){
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
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;
429
502
}
430
503
}
504
errno = 0;
431
505
}
432
506
break;
433
case 'f': /* --env-for */
434
if(arg == NULL){
435
break;
436
}
507
case 'E': /* --env-for */
437
508
{
438
509
char *envdef = strchr(arg, ':');
439
510
if(envdef == NULL){
440
break;
441
}
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(p_name == NULL){
444
break;
445
}
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
446
516
envdef++;
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
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;
449
524
}
450
525
}
451
526
break;
452
527
case 'd': /* --disable */
453
if (arg != NULL){
454
plugin *p = getplugin(arg);
455
if(p == NULL){
456
return ARGP_ERR_UNKNOWN;
457
}
458
p->disabled = true;
528
{
529
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
533
}
534
}
535
break;
536
case 'e': /* --enable */
537
{
538
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
542
}
459
543
}
460
544
break;
461
545
case 128: /* --plugin-dir */
546
free(plugindir);
462
547
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
548
if(plugindir != NULL){
549
errno = 0;
550
}
551
break;
552
case 129: /* --config-file */
553
/* This is already done by parse_opt_config_file() */
554
break;
555
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;
565
break;
566
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;
576
break;
577
case 132: /* --debug */
578
debug = true;
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
*/
607
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
619
default:
620
return ARGP_ERR_UNKNOWN;
621
}
622
return errno; /* Set to 0 at start */
623
}
624
625
/* This option parser is the same as parse_opt() above, except it
626
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){
632
case 'g': /* --global-options */
633
case 'G': /* --global-env */
634
case 'o': /* --options-for */
635
case 'E': /* --env-for */
636
case 'd': /* --disable */
637
case 'e': /* --enable */
638
case 128: /* --plugin-dir */
639
break;
640
case 129: /* --config-file */
641
free(argfile);
468
642
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
471
645
}
472
break;
646
break;
473
647
case 130: /* --userid */
474
uid = (uid_t)strtol(arg, NULL, 10);
475
break;
476
648
case 131: /* --groupid */
477
gid = (gid_t)strtol(arg, NULL, 10);
478
break;
479
649
case 132: /* --debug */
480
debug = true;
481
break;
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
482
654
case ARGP_KEY_ARG:
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
484
break;
485
case ARGP_KEY_END:
486
655
break;
487
656
default:
488
657
return ARGP_ERR_UNKNOWN;
489
658
}
490
return 0;
659
return errno;
491
660
}
492
661
493
struct argp argp = { .options = options, .parser = parse_opt,
662
struct argp argp = { .options = options,
663
.parser = parse_opt_config_file,
494
664
.args_doc = "",
495
665
.doc = "Mandos plugin runner -- Run plugins" };
496
666
667
/* Parse using parse_opt_config_file() in order to get the custom
668
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;
683
goto fallback;
684
}
685
686
/* Reset to the normal argument parser */
687
argp.parser = parse_opt;
688
497
689
/* Open the configfile if available */
498
if (argfile == NULL){
690
if(argfile == NULL){
499
691
conffp = fopen(AFILE, "r");
500
692
} else {
501
693
conffp = fopen(argfile, "r");
502
}
694
}
503
695
if(conffp != NULL){
504
696
char *org_line = NULL;
505
697
char *p, *arg, *new_arg, *line;
506
698
size_t size = 0;
507
ssize_t sret;
508
699
const char whitespace_delims[] = " \r\t\f\v\n";
509
700
const char comment_delim[] = "#";
510
701
511
702
custom_argc = 1;
512
703
custom_argv = malloc(sizeof(char*) * 2);
513
704
if(custom_argv == NULL){
514
perror("malloc");
515
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
516
707
goto fallback;
517
708
}
518
709
custom_argv[0] = argv[0];
519
710
custom_argv[1] = NULL;
520
711
521
712
/* for each line in the config file, strip whitespace and ignore
522
713
commented text */
523
714
while(true){
525
716
if(sret == -1){
526
717
break;
527
718
}
528
719
529
720
line = org_line;
530
721
arg = strsep(&line, comment_delim);
531
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
534
725
}
535
726
new_arg = strdup(p);
536
727
if(new_arg == NULL){
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
539
730
free(org_line);
540
731
goto fallback;
541
732
}
542
733
543
734
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
551
758
}
552
759
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
760
custom_argv[custom_argc] = NULL;
554
761
}
555
762
}
763
do {
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
766
if(ret == EOF){
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
769
goto fallback;
770
}
556
771
free(org_line);
557
772
} else {
558
773
/* Check for harmful errors and go to fallback. Other errors might
559
774
not affect opening plugins */
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
perror("fopen");
562
exitstatus = EXIT_FAILURE;
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
563
778
goto fallback;
564
779
}
565
780
}
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
568
783
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
571
if (ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
786
NULL, NULL);
787
switch(ret){
788
case 0:
789
break;
790
case ENOMEM:
791
default:
792
errno = ret;
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
795
goto fallback;
796
case EINVAL:
797
exitstatus = EX_CONFIG;
574
798
goto fallback;
575
799
}
576
800
}
577
801
578
802
/* Parse actual command line arguments, to let them override the
579
803
config file */
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
584
goto fallback;
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
806
NULL, NULL);
807
switch(ret){
808
case 0:
809
break;
810
case ENOMEM:
811
default:
812
errno = ret;
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
815
goto fallback;
816
case EINVAL:
817
exitstatus = EX_USAGE;
818
goto fallback;
819
}
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
585
837
}
586
838
587
839
if(debug){
588
for(plugin *p = plugin_list; p != NULL; p=p->next){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
589
841
fprintf(stderr, "Plugin: %s has %d arguments\n",
590
842
p->name ? p->name : "Global", p->argc - 1);
591
843
for(char **a = p->argv; *a != NULL; a++){
592
844
fprintf(stderr, "\tArg: %s\n", *a);
593
845
}
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
846
fprintf(stderr, "...and %d environment variables\n", p->envc);
595
847
for(char **a = p->environ; *a != NULL; a++){
596
848
fprintf(stderr, "\t%s\n", *a);
597
849
}
598
850
}
599
851
}
600
852
601
/* Strip permissions down to nobody */
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
888
if(ret == -1){
889
error(0, errno, "setgid");
890
}
602
891
ret = setuid(uid);
603
if (ret == -1){
604
perror("setuid");
605
}
606
setgid(gid);
607
if (ret == -1){
608
perror("setgid");
609
}
610
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
616
617
if(dir == NULL){
618
perror("Could not open plugin dir");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
621
}
622
623
/* Set the FD_CLOEXEC flag on the directory, if possible */
892
if(ret == -1){
893
error(0, errno, "setuid");
894
}
895
896
/* Open plugin directory with close_on_exec flag */
624
897
{
625
int dir_fd = dirfd(dir);
626
if(dir_fd >= 0){
627
ret = set_cloexec_flag(dir_fd);
628
if(ret < 0){
629
perror("set_cloexec_flag");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
905
if(dir_fd == -1){
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
908
goto fallback;
909
}
910
911
#ifndef O_CLOEXEC
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
914
if(ret < 0){
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
917
goto fallback;
918
}
919
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
632
942
}
633
943
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
634
954
}
635
955
636
956
FD_ZERO(&rfds_all);
637
957
638
958
/* Read and execute any executable in the plugin directory*/
639
while(true){
640
dirst = readdir(dir);
641
642
/* All directory entries have been processed */
643
if(dirst == NULL){
644
if (errno == EBADF){
645
perror("readdir");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
break;
650
}
651
652
d_name_len = strlen(dirst->d_name);
653
654
/* Ignore dotfiles, backup files and other junk */
655
{
656
bool bad_name = false;
657
658
const char const *bad_prefixes[] = { ".", "#", NULL };
659
660
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
661
".dpkg-old",
662
".dpkg-divert", NULL };
663
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
664
size_t pre_len = strlen(*pre);
665
if((d_name_len >= pre_len)
666
and strncmp((dirst->d_name), *pre, pre_len) == 0){
667
if(debug){
668
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
669
" with bad prefix %s\n", dirst->d_name, *pre);
670
}
671
bad_name = true;
672
break;
673
}
674
}
675
if(bad_name){
676
continue;
677
}
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
size_t suf_len = strlen(*suf);
680
if((d_name_len >= suf_len)
681
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
682
== 0)){
683
if(debug){
684
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
685
" with bad suffix %s\n", dirst->d_name, *suf);
686
}
687
bad_name = true;
688
break;
689
}
690
}
691
692
if(bad_name){
693
continue;
694
}
695
}
696
697
char *filename;
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
699
if(ret < 0){
700
perror("asprintf");
701
continue;
702
}
703
704
ret = stat(filename, &st);
705
if (ret == -1){
706
perror("stat");
707
free(filename);
708
continue;
709
}
710
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
965
continue;
966
}
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
968
if(ret == -1){
969
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
972
continue;
973
}
974
711
975
/* Ignore non-executable files */
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
713
979
if(debug){
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
715
" with bad type or mode\n", filename);
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
716
984
}
717
free(filename);
985
close(plugin_fd);
986
free(direntries[i]);
718
987
continue;
719
988
}
720
989
721
plugin *p = getplugin(dirst->d_name);
990
plugin *p = getplugin(direntries[i]->d_name);
722
991
if(p == NULL){
723
perror("getplugin");
724
free(filename);
992
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
725
995
continue;
726
996
}
727
997
if(p->disabled){
728
998
if(debug){
729
999
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
730
dirst->d_name);
1000
direntries[i]->d_name);
731
1001
}
732
free(filename);
1002
close(plugin_fd);
1003
free(direntries[i]);
733
1004
continue;
734
1005
}
735
1006
{
738
1009
if(g != NULL){
739
1010
for(char **a = g->argv + 1; *a != NULL; a++){
740
1011
if(not add_argument(p, *a)){
741
perror("add_argument");
1012
error(0, errno, "add_argument");
742
1013
}
743
1014
}
744
1015
/* Add global environment variables */
745
1016
for(char **e = g->environ; *e != NULL; e++){
746
1017
if(not add_environment(p, *e, false)){
747
perror("add_environment");
1018
error(0, errno, "add_environment");
748
1019
}
749
1020
}
750
1021
}
751
1022
}
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
754
process, too. */
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
755
1025
if(p->environ[0] != NULL){
756
1026
for(char **e = environ; *e != NULL; e++){
757
1027
if(not add_environment(p, *e, false)){
758
perror("add_environment");
1028
error(0, errno, "add_environment");
759
1029
}
760
1030
}
761
1031
}
762
1032
763
1033
int pipefd[2];
764
ret = pipe(pipefd);
765
if (ret == -1){
766
perror("pipe");
767
exitstatus = EXIT_FAILURE;
768
goto fallback;
769
}
1034
#ifndef O_CLOEXEC
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
1039
if(ret == -1){
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
770
1055
/* Ask OS to automatic close the pipe on exec */
771
1056
ret = set_cloexec_flag(pipefd[0]);
772
1057
if(ret < 0){
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
775
1063
goto fallback;
776
1064
}
777
1065
ret = set_cloexec_flag(pipefd[1]);
778
1066
if(ret < 0){
779
perror("set_cloexec_flag");
780
exitstatus = EXIT_FAILURE;
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
781
1072
goto fallback;
782
1073
}
1074
#endif /* not O_CLOEXEC */
783
1075
/* Block SIGCHLD until process is safely in process list */
784
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
1078
NULL));
785
1079
if(ret < 0){
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
788
1083
goto fallback;
789
1084
}
790
1085
/* Starting a new process to be watched */
791
pid_t pid = fork();
1086
pid_t pid;
1087
do {
1088
pid = fork();
1089
} while(pid == -1 and errno == EINTR);
792
1090
if(pid == -1){
793
perror("fork");
794
exitstatus = EXIT_FAILURE;
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
795
1098
goto fallback;
796
1099
}
797
1100
if(pid == 0){
798
1101
/* this is the child process */
799
1102
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
800
1103
if(ret < 0){
801
perror("sigaction");
802
_exit(EXIT_FAILURE);
1104
error(0, errno, "sigaction");
1105
_exit(EX_OSERR);
803
1106
}
804
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
805
1108
if(ret < 0){
806
perror("sigprocmask");
807
_exit(EXIT_FAILURE);
1109
error(0, errno, "sigprocmask");
1110
_exit(EX_OSERR);
808
1111
}
809
1112
810
1113
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
811
1114
if(ret == -1){
812
perror("dup2");
813
_exit(EXIT_FAILURE);
1115
error(0, errno, "dup2");
1116
_exit(EX_OSERR);
814
1117
}
815
1118
816
if(dirfd(dir) < 0){
817
/* If dir has no file descriptor, we could not set FD_CLOEXEC
818
above and must now close it manually here. */
819
closedir(dir);
820
}
821
if(p->environ[0] == NULL){
822
if(execv(filename, p->argv) < 0){
823
perror("execv");
824
_exit(EXIT_FAILURE);
825
}
826
} else {
827
if(execve(filename, p->argv, p->environ) < 0){
828
perror("execve");
829
_exit(EXIT_FAILURE);
830
}
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
831
1125
}
832
1126
/* no return */
833
1127
}
834
1128
/* Parent process */
835
1129
close(pipefd[1]); /* Close unused write end of pipe */
836
free(filename);
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
perror("getplugin");
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1132
if(new_plugin == NULL){
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1136
NULL)));
841
1137
if(ret < 0){
842
perror("sigprocmask");
1138
error(0, errno, "sigprocmask");
843
1139
}
844
exitstatus = EXIT_FAILURE;
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
845
1142
goto fallback;
846
1143
}
1144
free(direntries[i]);
847
1145
848
1146
new_plugin->pid = pid;
849
1147
new_plugin->fd = pipefd[0];
850
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
851
1154
/* Unblock SIGCHLD so signal handler can be run if this process
852
1155
has already completed */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
1158
NULL));
854
1159
if(ret < 0){
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
857
1162
goto fallback;
858
1163
}
859
1164
860
1165
FD_SET(new_plugin->fd, &rfds_all);
861
1166
862
if (maxfd < new_plugin->fd){
1167
if(maxfd < new_plugin->fd){
863
1168
maxfd = new_plugin->fd;
864
1169
}
865
866
1170
}
867
1171
868
closedir(dir);
869
dir = NULL;
870
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1176
free_plugin(getplugin(NULL));
1177
871
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
872
1179
if(p->pid != 0){
873
1180
break;
878
1185
free_plugin_list();
879
1186
}
880
1187
}
881
1188
882
1189
/* Main loop while running plugins exist */
883
1190
while(plugin_list){
884
1191
fd_set rfds = rfds_all;
885
1192
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
886
if (select_ret == -1){
887
perror("select");
888
exitstatus = EXIT_FAILURE;
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
889
1196
goto fallback;
890
1197
}
891
1198
/* OK, now either a process completed, or something can be read
892
1199
from one of them */
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1200
for(plugin *proc = plugin_list; proc != NULL;){
894
1201
/* Is this process completely done? */
895
if(proc->eof and proc->completed){
1202
if(proc->completed and proc->eof){
896
1203
/* Only accept the plugin output if it exited cleanly */
897
1204
if(not WIFEXITED(proc->status)
898
1205
or WEXITSTATUS(proc->status) != 0){
899
1206
/* Bad exit by plugin */
900
1207
901
1208
if(debug){
902
1209
if(WIFEXITED(proc->status)){
903
fprintf(stderr, "Plugin %u exited with status %d\n",
904
(unsigned int) (proc->pid),
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1211
" status %d\n", proc->name,
1212
(intmax_t) (proc->pid),
905
1213
WEXITSTATUS(proc->status));
906
} else if(WIFSIGNALED(proc->status)) {
907
fprintf(stderr, "Plugin %u killed by signal %d\n",
908
(unsigned int) (proc->pid),
909
WTERMSIG(proc->status));
910
} else if(WCOREDUMP(proc->status)){
911
fprintf(stderr, "Plugin %d dumped core\n",
912
(unsigned int) (proc->pid));
1214
} else if(WIFSIGNALED(proc->status)){
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1216
" signal %d: %s\n", proc->name,
1217
(intmax_t) (proc->pid),
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
913
1220
}
914
1221
}
915
1222
916
1223
/* Remove the plugin */
917
1224
FD_CLR(proc->fd, &rfds_all);
918
1225
919
1226
/* Block signal while modifying process_list */
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1228
(SIG_BLOCK,
1229
&sigchld_action.sa_mask,
1230
NULL));
921
1231
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
924
1234
goto fallback;
925
1235
}
1236
1237
plugin *next_plugin = proc->next;
926
1238
free_plugin(proc);
1239
proc = next_plugin;
1240
927
1241
/* We are done modifying process list, so unblock signal */
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
929
NULL);
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
930
1245
if(ret < 0){
931
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
933
1248
goto fallback;
934
1249
}
935
1250
936
1251
if(plugin_list == NULL){
937
1252
break;
938
1253
}
1254
939
1255
continue;
940
1256
}
941
1257
942
1258
/* This process exited nicely, so print its buffer */
943
1259
944
1260
bool bret = print_out_password(proc->buffer,
945
1261
proc->buffer_length);
946
1262
if(not bret){
947
perror("print_out_password");
948
exitstatus = EXIT_FAILURE;
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;
949
1265
}
950
1266
goto fallback;
951
1267
}
953
1269
/* This process has not completed. Does it have any output? */
954
1270
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
955
1271
/* This process had nothing to say at this time */
1272
proc = proc->next;
956
1273
continue;
957
1274
}
958
1275
/* Before reading, make the process' data buffer large enough */
959
1276
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
960
proc->buffer = realloc(proc->buffer, proc->buffer_size
961
+ (size_t) BUFFER_SIZE);
962
if (proc->buffer == NULL){
963
perror("malloc");
964
exitstatus = EXIT_FAILURE;
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1280
error(0, errno, "malloc");
1281
exitstatus = EX_OSERR;
965
1282
goto fallback;
966
1283
}
1284
proc->buffer = new_buffer;
967
1285
proc->buffer_size += BUFFER_SIZE;
968
1286
}
969
1287
/* Read from the process */
970
ret = read(proc->fd, proc->buffer + proc->buffer_length,
971
BUFFER_SIZE);
972
if(ret < 0){
1288
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
proc->buffer
1290
+ proc->buffer_length,
1291
BUFFER_SIZE));
1292
if(sret < 0){
973
1293
/* Read error from this process; ignore the error */
1294
proc = proc->next;
974
1295
continue;
975
1296
}
976
if(ret == 0){
1297
if(sret == 0){
977
1298
/* got EOF */
978
1299
proc->eof = true;
979
1300
} else {
980
proc->buffer_length += (size_t) ret;
1301
proc->buffer_length += (size_t) sret;
981
1302
}
982
1303
}
983
1304
}
984
985
1305
1306
986
1307
fallback:
987
1308
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1309
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1310
and exitstatus != EX_OK)){
989
1311
/* Fallback if all plugins failed, none are found or an error
990
1312
occured */
991
1313
bool bret;
992
1314
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
993
1315
char *passwordbuffer = getpass("Password: ");
994
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1316
size_t len = strlen(passwordbuffer);
1317
/* Strip trailing newline */
1318
if(len > 0 and passwordbuffer[len-1] == '\n'){
1319
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1320
len--;
1321
}
1322
bret = print_out_password(passwordbuffer, len);
995
1323
if(not bret){
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1324
error(0, errno, "print_out_password");
1325
exitstatus = EX_IOERR;
998
1326
}
999
1327
}
1000
1328
1001
1329
/* Restore old signal handler */
1002
1330
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
1331
if(ret == -1){
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1332
error(0, errno, "sigaction");
1333
exitstatus = EX_OSERR;
1006
1334
}
1007
1335
1008
1336
if(custom_argv != NULL){
1009
1337
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1010
1338
free(*arg);
1012
1340
free(custom_argv);
1013
1341
}
1014
1342
1015
if(dir != NULL){
1016
closedir(dir);
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1017
1347
}
1018
1348
1019
/* Free the process list and kill the processes */
1349
/* Kill the processes */
1020
1350
for(plugin *p = plugin_list; p != NULL; p = p->next){
1021
1351
if(p->pid != 0){
1022
1352
close(p->fd);
1023
1353
ret = kill(p->pid, SIGTERM);
1024
1354
if(ret == -1 and errno != ESRCH){
1025
1355
/* Set-uid proccesses might not get closed */
1026
perror("kill");
1356
error(0, errno, "kill");
1027
1357
}
1028
1358
}
1029
1359
}
1030
1360
1031
1361
/* Wait for any remaining child processes to terminate */
1032
do{
1362
do {
1033
1363
ret = wait(NULL);
1034
1364
} while(ret >= 0);
1035
1365
if(errno != ECHILD){
1036
perror("wait");
1366
error(0, errno, "wait");
1037
1367
}
1038
1368
1039
1369
free_plugin_list();
1040
1370
1041
1371
free(plugindir);
1372
free(pluginhelperdir);
1042
1373
free(argfile);
1043
1374
1044
1375
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0