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- Committer: Teddy Hogeborn
- Date: 2019-07-18 00:02:43 UTC
- Revision ID: teddy@recompile.se-20190718000243-okz4s9xao1r1tfnx
Document bug in mandos-keygen which strips white space from passwords
Passwords, as read by mandos-keygen when given the --password or -p
options, are stripped of white space from the start and from the end
of the password. This is because mandos-keygen is a shell script, and
the Bourne Shell "read" builtin does not seem to have a way to avoid
this. Document this bug.
* manods-keygen.xml (OPTIONS): Document the white space-stripping
nature of the --password/-p option, and
also note in the description of
--passfile and -F that they avoid this
behavior.
(BUGS): Again mention the problem with the --password and -p
options, and suggest --passfile as a possible workaround.
Passwords, as read by mandos-keygen when given the --password or -p
options, are stripped of white space from the start and from the end
of the password. This is because mandos-keygen is a shell script, and
the Bourne Shell "read" builtin does not seem to have a way to avoid
this. Document this bug.
* manods-keygen.xml (OPTIONS): Document the white space-stripping
nature of the --password/-p option, and
also note in the description of
--passfile and -F that they avoid this
behavior.
(BUGS): Again mention the problem with the --password and -p
options, and suggest --passfile as a possible workaround.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- 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 © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
97
105
static plugin *plugin_list = NULL;
98
106
99
/* Gets a existing plugin based on name,
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
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){
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
185
220
}
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
192
238
return true;
193
239
}
194
240
}
195
241
return add_to_char_array(def, &(p->environ), &(p->envc));
196
242
}
197
243
244
#ifndef O_CLOEXEC
198
245
/*
199
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
200
247
* Descriptor Flags".
201
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
202
249
*/
203
static int set_cloexec_flag(int fd)
204
{
205
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
206
253
/* If reading the flags failed, return error indication now. */
207
254
if(ret < 0){
208
255
return ret;
209
256
}
210
257
/* Store modified flag word in the descriptor. */
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
212
260
}
261
#endif /* not O_CLOEXEC */
213
262
214
263
215
264
/* Mark processes as completed when they exit, and save their exit
216
265
status. */
217
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
218
268
while(true){
219
269
plugin *proc = plugin_list;
220
270
int status;
224
274
break;
225
275
}
226
276
if(pid == -1){
227
if (errno != ECHILD){
228
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
229
280
}
230
/* No child processes */
231
break;
281
error(0, errno, "waitpid");
232
282
}
233
283
234
284
/* A child exited, find it in process_list */
235
285
while(proc != NULL and proc->pid != pid){
236
286
proc = proc->next;
240
290
continue;
241
291
}
242
292
proc->status = status;
243
proc->completed = true;
293
proc->completed = 1;
244
294
}
295
errno = old_errno;
245
296
}
246
297
247
298
/* Prints out a password to stdout */
248
bool print_out_password(const char *buffer, size_t length){
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
249
301
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
253
302
for(size_t written = 0; written < length; written += (size_t)ret){
254
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
255
304
length - written));
261
310
}
262
311
263
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
264
314
static void free_plugin(plugin *plugin_node){
265
315
266
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
267
317
free(*arg);
268
318
}
319
free(plugin_node->name);
269
320
free(plugin_node->argv);
270
321
for(char **env = plugin_node->environ; *env != NULL; env++){
271
322
free(*env);
272
323
}
273
324
free(plugin_node->environ);
274
325
free(plugin_node->buffer);
275
326
276
327
/* Removes the plugin from the singly-linked list */
277
328
if(plugin_node == plugin_list){
278
329
/* First one - simple */
298
349
299
350
int main(int argc, char *argv[]){
300
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
301
353
char *argfile = NULL;
302
354
FILE *conffp;
303
size_t d_name_len;
304
DIR *dir = NULL;
305
struct dirent *dirst;
355
struct dirent **direntries = NULL;
306
356
struct stat st;
307
357
fd_set rfds_all;
308
358
int ret, maxfd = 0;
359
ssize_t sret;
309
360
uid_t uid = 65534;
310
361
gid_t gid = 65534;
311
362
bool debug = false;
315
366
.sa_flags = SA_NOCLDSTOP };
316
367
char **custom_argv = NULL;
317
368
int custom_argc = 0;
369
int dir_fd = -1;
318
370
319
371
/* Establish a signal handler */
320
372
sigemptyset(&sigchld_action.sa_mask);
321
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
322
374
if(ret == -1){
323
perror("sigaddset");
324
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
325
377
goto fallback;
326
378
}
327
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
328
380
if(ret == -1){
329
perror("sigaction");
330
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
331
383
goto fallback;
332
384
}
333
385
336
388
{ .name = "global-options", .key = 'g',
337
389
.arg = "OPTION[,OPTION[,...]]",
338
390
.doc = "Options passed to all plugins" },
339
{ .name = "global-env", .key = 'e',
391
{ .name = "global-env", .key = 'G',
340
392
.arg = "VAR=value",
341
393
.doc = "Environment variable passed to all plugins" },
342
394
{ .name = "options-for", .key = 'o',
343
395
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
344
396
.doc = "Options passed only to specified plugin" },
345
{ .name = "env-for", .key = 'f',
397
{ .name = "env-for", .key = 'E',
346
398
.arg = "PLUGIN:ENV=value",
347
399
.doc = "Environment variable passed to specified plugin" },
348
400
{ .name = "disable", .key = 'd',
349
401
.arg = "PLUGIN",
350
402
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
351
406
{ .name = "plugin-dir", .key = 128,
352
407
.arg = "DIRECTORY",
353
408
.doc = "Specify a different plugin directory", .group = 2 },
362
417
.doc = "Group ID the plugins will run as", .group = 3 },
363
418
{ .name = "debug", .key = 132,
364
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
365
433
{ .name = NULL }
366
434
};
367
435
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
370
/* Get the INPUT argument from `argp_parse', which we know is a
371
pointer to our plugin list pointer. */
372
switch (key) {
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
373
442
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
391
443
{
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
398
}
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
448
}
449
}
450
errno = 0;
451
}
452
break;
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
399
456
}
400
457
break;
401
458
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
421
477
}
422
478
}
479
errno = 0;
423
480
}
424
481
break;
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
482
case 'E': /* --env-for */
429
483
{
430
484
char *envdef = strchr(arg, ':');
431
485
if(envdef == NULL){
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
438
491
envdef++;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
441
499
}
442
500
}
443
501
break;
444
502
case 'd': /* --disable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = true;
503
{
504
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
508
}
509
}
510
break;
511
case 'e': /* --enable */
512
{
513
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
517
}
451
518
}
452
519
break;
453
520
case 128: /* --plugin-dir */
521
free(plugindir);
454
522
plugindir = strdup(arg);
455
if(plugindir == NULL){
456
perror("strdup");
457
}
458
break;
459
case 129: /* --config-file */
523
if(plugindir != NULL){
524
errno = 0;
525
}
526
break;
527
case 129: /* --config-file */
528
/* This is already done by parse_opt_config_file() */
529
break;
530
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
540
break;
541
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
551
break;
552
case 132: /* --debug */
553
debug = true;
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
582
case ARGP_KEY_ARG:
583
/* Cryptsetup always passes an argument, which is an empty
584
string if "none" was specified in /etc/crypttab. So if
585
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
588
}
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
594
default:
595
return ARGP_ERR_UNKNOWN;
596
}
597
return errno; /* Set to 0 at start */
598
}
599
600
/* This option parser is the same as parse_opt() above, except it
601
ignores everything but the --config-file option. */
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
607
case 'g': /* --global-options */
608
case 'G': /* --global-env */
609
case 'o': /* --options-for */
610
case 'E': /* --env-for */
611
case 'd': /* --disable */
612
case 'e': /* --enable */
613
case 128: /* --plugin-dir */
614
break;
615
case 129: /* --config-file */
616
free(argfile);
460
617
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
618
if(argfile != NULL){
619
errno = 0;
463
620
}
464
break;
621
break;
465
622
case 130: /* --userid */
466
uid = (uid_t)strtol(arg, NULL, 10);
467
break;
468
623
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
470
break;
471
624
case 132: /* --debug */
472
debug = true;
473
break;
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
474
629
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
476
break;
477
case ARGP_KEY_END:
478
630
break;
479
631
default:
480
632
return ARGP_ERR_UNKNOWN;
481
633
}
482
return 0;
634
return errno;
483
635
}
484
636
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
637
struct argp argp = { .options = options,
638
.parser = parse_opt_config_file,
639
.args_doc = "",
487
640
.doc = "Mandos plugin runner -- Run plugins" };
488
641
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
exitstatus = EXIT_FAILURE;
642
/* Parse using parse_opt_config_file() in order to get the custom
643
config file location, if any. */
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
493
658
goto fallback;
494
659
}
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
660
661
/* Reset to the normal argument parser */
662
argp.parser = parse_opt;
663
664
/* Open the configfile if available */
665
if(argfile == NULL){
498
666
conffp = fopen(AFILE, "r");
499
667
} else {
500
668
conffp = fopen(argfile, "r");
501
}
669
}
502
670
if(conffp != NULL){
503
671
char *org_line = NULL;
504
672
char *p, *arg, *new_arg, *line;
505
673
size_t size = 0;
506
ssize_t sret;
507
674
const char whitespace_delims[] = " \r\t\f\v\n";
508
675
const char comment_delim[] = "#";
509
676
510
677
custom_argc = 1;
511
678
custom_argv = malloc(sizeof(char*) * 2);
512
679
if(custom_argv == NULL){
513
perror("malloc");
514
exitstatus = EXIT_FAILURE;
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
515
682
goto fallback;
516
683
}
517
684
custom_argv[0] = argv[0];
518
685
custom_argv[1] = NULL;
519
686
520
687
/* for each line in the config file, strip whitespace and ignore
521
688
commented text */
522
689
while(true){
524
691
if(sret == -1){
525
692
break;
526
693
}
527
694
528
695
line = org_line;
529
696
arg = strsep(&line, comment_delim);
530
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
533
700
}
534
701
new_arg = strdup(p);
535
702
if(new_arg == NULL){
536
perror("strdup");
537
exitstatus = EXIT_FAILURE;
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
538
705
free(org_line);
539
706
goto fallback;
540
707
}
541
708
542
709
custom_argc += 1;
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
546
perror("realloc");
547
exitstatus = EXIT_FAILURE;
548
free(org_line);
549
goto fallback;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
550
722
}
551
723
custom_argv[custom_argc-1] = new_arg;
552
custom_argv[custom_argc] = NULL;
724
custom_argv[custom_argc] = NULL;
553
725
}
554
726
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
555
735
free(org_line);
556
} else{
736
} else {
557
737
/* Check for harmful errors and go to fallback. Other errors might
558
738
not affect opening plugins */
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
perror("fopen");
561
exitstatus = EXIT_FAILURE;
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
562
742
goto fallback;
563
743
}
564
744
}
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
567
747
if(custom_argv != NULL){
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
762
goto fallback;
763
}
764
}
765
766
/* Parse actual command line arguments, to let them override the
767
config file */
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
573
800
}
574
801
}
575
802
576
803
if(debug){
577
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
578
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
579
806
p->name ? p->name : "Global", p->argc - 1);
580
807
for(char **a = p->argv; *a != NULL; a++){
581
808
fprintf(stderr, "\tArg: %s\n", *a);
582
809
}
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
584
811
for(char **a = p->environ; *a != NULL; a++){
585
812
fprintf(stderr, "\t%s\n", *a);
586
813
}
587
814
}
588
815
}
589
590
/* Strip permissions down to nobody */
816
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
591
846
ret = setuid(uid);
592
if (ret == -1){
593
perror("setuid");
594
}
595
setgid(gid);
596
if (ret == -1){
597
perror("setgid");
598
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
605
606
if(dir == NULL){
607
perror("Could not open plugin dir");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
610
}
611
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
613
852
{
614
int dir_fd = dirfd(dir);
615
if(dir_fd >= 0){
616
ret = set_cloexec_flag(dir_fd);
617
if(ret < 0){
618
perror("set_cloexec_flag");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
621
897
}
622
898
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
623
909
}
624
910
625
911
FD_ZERO(&rfds_all);
626
912
627
913
/* Read and execute any executable in the plugin directory*/
628
while(true){
629
dirst = readdir(dir);
630
631
// All directory entries have been processed
632
if(dirst == NULL){
633
if (errno == EBADF){
634
perror("readdir");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
638
break;
639
}
640
641
d_name_len = strlen(dirst->d_name);
642
643
// Ignore dotfiles, backup files and other junk
644
{
645
bool bad_name = false;
646
647
const char const *bad_prefixes[] = { ".", "#", NULL };
648
649
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
650
".dpkg-old",
651
".dpkg-divert", NULL };
652
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
size_t pre_len = strlen(*pre);
654
if((d_name_len >= pre_len)
655
and strncmp((dirst->d_name), *pre, pre_len) == 0){
656
if(debug){
657
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
658
" with bad prefix %s\n", dirst->d_name, *pre);
659
}
660
bad_name = true;
661
break;
662
}
663
}
664
if(bad_name){
665
continue;
666
}
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
size_t suf_len = strlen(*suf);
669
if((d_name_len >= suf_len)
670
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
671
== 0)){
672
if(debug){
673
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
674
" with bad suffix %s\n", dirst->d_name, *suf);
675
}
676
bad_name = true;
677
break;
678
}
679
}
680
681
if(bad_name){
682
continue;
683
}
684
}
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
688
if(ret < 0){
689
perror("asprintf");
690
continue;
691
}
692
693
ret = stat(filename, &st);
694
if (ret == -1){
695
perror("stat");
696
free(filename);
697
continue;
698
}
699
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
700
930
/* Ignore non-executable files */
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
702
934
if(debug){
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
" with bad type or mode\n", filename);
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
705
939
}
706
free(filename);
940
close(plugin_fd);
941
free(direntries[i]);
707
942
continue;
708
943
}
709
944
710
plugin *p = getplugin(dirst->d_name);
945
plugin *p = getplugin(direntries[i]->d_name);
711
946
if(p == NULL){
712
perror("getplugin");
713
free(filename);
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
714
950
continue;
715
951
}
716
952
if(p->disabled){
717
953
if(debug){
718
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
719
dirst->d_name);
955
direntries[i]->d_name);
720
956
}
721
free(filename);
957
close(plugin_fd);
958
free(direntries[i]);
722
959
continue;
723
960
}
724
961
{
727
964
if(g != NULL){
728
965
for(char **a = g->argv + 1; *a != NULL; a++){
729
966
if(not add_argument(p, *a)){
730
perror("add_argument");
967
error(0, errno, "add_argument");
731
968
}
732
969
}
733
970
/* Add global environment variables */
734
971
for(char **e = g->environ; *e != NULL; e++){
735
if(not add_environment(p, *e)){
736
perror("add_environment");
972
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
737
974
}
738
975
}
739
976
}
740
977
}
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
743
process, too. */
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
744
980
if(p->environ[0] != NULL){
745
981
for(char **e = environ; *e != NULL; e++){
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
752
perror("add_environment");
982
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
753
984
}
754
985
}
755
986
}
756
987
757
988
int pipefd[2];
758
ret = pipe(pipefd);
759
if (ret == -1){
760
perror("pipe");
761
exitstatus = EXIT_FAILURE;
762
goto fallback;
763
}
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
764
1010
/* Ask OS to automatic close the pipe on exec */
765
1011
ret = set_cloexec_flag(pipefd[0]);
766
1012
if(ret < 0){
767
perror("set_cloexec_flag");
768
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
769
1018
goto fallback;
770
1019
}
771
1020
ret = set_cloexec_flag(pipefd[1]);
772
1021
if(ret < 0){
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
775
1027
goto fallback;
776
1028
}
1029
#endif /* not O_CLOEXEC */
777
1030
/* Block SIGCHLD until process is safely in process list */
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
779
1034
if(ret < 0){
780
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
782
1038
goto fallback;
783
1039
}
784
// Starting a new process to be watched
785
pid_t pid = fork();
1040
/* Starting a new process to be watched */
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
786
1045
if(pid == -1){
787
perror("fork");
788
exitstatus = EXIT_FAILURE;
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
789
1053
goto fallback;
790
1054
}
791
1055
if(pid == 0){
792
1056
/* this is the child process */
793
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
794
1058
if(ret < 0){
795
perror("sigaction");
796
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
797
1061
}
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
799
1063
if(ret < 0){
800
perror("sigprocmask");
801
_exit(EXIT_FAILURE);
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
802
1066
}
803
1067
804
1068
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
805
1069
if(ret == -1){
806
perror("dup2");
807
_exit(EXIT_FAILURE);
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
808
1072
}
809
1073
810
if(dirfd(dir) < 0){
811
/* If dir has no file descriptor, we could not set FD_CLOEXEC
812
above and must now close it manually here. */
813
closedir(dir);
814
}
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
817
perror("execv");
818
_exit(EXIT_FAILURE);
819
}
820
} else {
821
if(execve(filename, p->argv, p->environ) < 0){
822
perror("execve");
823
_exit(EXIT_FAILURE);
824
}
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
825
1080
}
826
1081
/* no return */
827
1082
}
828
1083
/* Parent process */
829
1084
close(pipefd[1]); /* Close unused write end of pipe */
830
free(filename);
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
833
perror("getplugin");
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
835
1092
if(ret < 0){
836
perror("sigprocmask");
1093
error(0, errno, "sigprocmask");
837
1094
}
838
exitstatus = EXIT_FAILURE;
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
839
1097
goto fallback;
840
1098
}
1099
free(direntries[i]);
841
1100
842
1101
new_plugin->pid = pid;
843
1102
new_plugin->fd = pipefd[0];
844
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
845
1109
/* Unblock SIGCHLD so signal handler can be run if this process
846
1110
has already completed */
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
848
1114
if(ret < 0){
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
851
1117
goto fallback;
852
1118
}
853
1119
854
1120
FD_SET(new_plugin->fd, &rfds_all);
855
1121
856
if (maxfd < new_plugin->fd){
1122
if(maxfd < new_plugin->fd){
857
1123
maxfd = new_plugin->fd;
858
1124
}
859
860
1125
}
861
1126
862
closedir(dir);
863
dir = NULL;
864
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
865
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
866
1134
if(p->pid != 0){
867
1135
break;
872
1140
free_plugin_list();
873
1141
}
874
1142
}
875
1143
876
1144
/* Main loop while running plugins exist */
877
1145
while(plugin_list){
878
1146
fd_set rfds = rfds_all;
879
1147
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
880
if (select_ret == -1){
881
perror("select");
882
exitstatus = EXIT_FAILURE;
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
883
1151
goto fallback;
884
1152
}
885
1153
/* OK, now either a process completed, or something can be read
886
1154
from one of them */
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1155
for(plugin *proc = plugin_list; proc != NULL;){
888
1156
/* Is this process completely done? */
889
if(proc->eof and proc->completed){
1157
if(proc->completed and proc->eof){
890
1158
/* Only accept the plugin output if it exited cleanly */
891
1159
if(not WIFEXITED(proc->status)
892
1160
or WEXITSTATUS(proc->status) != 0){
893
1161
/* Bad exit by plugin */
894
1162
895
1163
if(debug){
896
1164
if(WIFEXITED(proc->status)){
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
899
1168
WEXITSTATUS(proc->status));
900
} else if(WIFSIGNALED(proc->status)) {
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(proc->status));
904
} else if(WCOREDUMP(proc->status)){
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
907
1175
}
908
1176
}
909
1177
910
1178
/* Remove the plugin */
911
1179
FD_CLR(proc->fd, &rfds_all);
912
1180
913
1181
/* Block signal while modifying process_list */
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
915
1186
if(ret < 0){
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
918
1189
goto fallback;
919
1190
}
1191
1192
plugin *next_plugin = proc->next;
920
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
921
1196
/* We are done modifying process list, so unblock signal */
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
NULL);
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
924
1200
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
927
1203
goto fallback;
928
1204
}
929
1205
930
1206
if(plugin_list == NULL){
931
1207
break;
932
1208
}
1209
933
1210
continue;
934
1211
}
935
1212
936
1213
/* This process exited nicely, so print its buffer */
937
1214
938
1215
bool bret = print_out_password(proc->buffer,
939
1216
proc->buffer_length);
940
1217
if(not bret){
941
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
943
1220
}
944
1221
goto fallback;
945
1222
}
947
1224
/* This process has not completed. Does it have any output? */
948
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
949
1226
/* This process had nothing to say at this time */
1227
proc = proc->next;
950
1228
continue;
951
1229
}
952
1230
/* Before reading, make the process' data buffer large enough */
953
1231
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
954
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
957
perror("malloc");
958
exitstatus = EXIT_FAILURE;
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
959
1237
goto fallback;
960
1238
}
1239
proc->buffer = new_buffer;
961
1240
proc->buffer_size += BUFFER_SIZE;
962
1241
}
963
1242
/* Read from the process */
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
965
BUFFER_SIZE);
966
if(ret < 0){
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
967
1248
/* Read error from this process; ignore the error */
1249
proc = proc->next;
968
1250
continue;
969
1251
}
970
if(ret == 0){
1252
if(sret == 0){
971
1253
/* got EOF */
972
1254
proc->eof = true;
973
1255
} else {
974
proc->buffer_length += (size_t) ret;
1256
proc->buffer_length += (size_t) sret;
975
1257
}
976
1258
}
977
1259
}
978
979
1260
1261
980
1262
fallback:
981
1263
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
983
1266
/* Fallback if all plugins failed, none are found or an error
984
1267
occured */
985
1268
bool bret;
986
1269
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
987
1270
char *passwordbuffer = getpass("Password: ");
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1271
size_t len = strlen(passwordbuffer);
1272
/* Strip trailing newline */
1273
if(len > 0 and passwordbuffer[len-1] == '\n'){
1274
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1275
len--;
1276
}
1277
bret = print_out_password(passwordbuffer, len);
989
1278
if(not bret){
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
992
1281
}
993
1282
}
994
1283
995
1284
/* Restore old signal handler */
996
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
997
1286
if(ret == -1){
998
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1000
1289
}
1001
1290
1002
1291
if(custom_argv != NULL){
1003
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1004
1293
free(*arg);
1006
1295
free(custom_argv);
1007
1296
}
1008
1297
1009
if(dir != NULL){
1010
closedir(dir);
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1011
1302
}
1012
1303
1013
/* Free the process list and kill the processes */
1304
/* Kill the processes */
1014
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1015
1306
if(p->pid != 0){
1016
1307
close(p->fd);
1017
1308
ret = kill(p->pid, SIGTERM);
1018
1309
if(ret == -1 and errno != ESRCH){
1019
1310
/* Set-uid proccesses might not get closed */
1020
perror("kill");
1311
error(0, errno, "kill");
1021
1312
}
1022
1313
}
1023
1314
}
1024
1315
1025
1316
/* Wait for any remaining child processes to terminate */
1026
do{
1317
do {
1027
1318
ret = wait(NULL);
1028
1319
} while(ret >= 0);
1029
1320
if(errno != ECHILD){
1030
perror("wait");
1321
error(0, errno, "wait");
1031
1322
}
1032
1323
1033
1324
free_plugin_list();
1034
1325
1035
1326
free(plugindir);
1327
free(pluginhelperdir);
1036
1328
free(argfile);
1037
1329
1038
1330
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0