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- Committer: Björn Påhlsson
- Date: 2008-08-11 16:07:39 UTC
- mfrom: (65 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 66.
- Revision ID: belorn@braxen-20080811160739-if8jv4zw8z90kw36
merge
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
mandos-client.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2018 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
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
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() */
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() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
60
59
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#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() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
85
typedef struct plugin{
86
char *name; /* can be NULL or any plugin name */
87
char **argv;
88
int argc;
89
char **environ;
90
int envc;
91
bool disabled;
92
93
/* Variables used for running processes*/
69
const char *argp_program_version = "mandos-client 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
94
75
pid_t pid;
95
76
int fd;
96
77
char *buffer;
97
78
size_t buffer_size;
98
79
size_t buffer_length;
99
80
bool eof;
100
volatile sig_atomic_t completed;
81
bool completed;
101
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
102
91
struct plugin *next;
103
92
} plugin;
104
93
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
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))){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
115
98
return p;
116
99
}
117
100
}
118
101
/* Create a new plugin */
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){
124
return NULL;
125
}
126
char *copy_name = NULL;
127
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
return NULL;
136
}
137
}
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;
149
free(copy_name);
150
free(new_plugin);
151
errno = e;
152
return NULL;
153
}
154
new_plugin->argv[0] = copy_name;
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
155
114
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
160
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
163
free(new_plugin->argv);
164
free(new_plugin);
165
errno = e;
166
return NULL;
167
}
168
new_plugin->environ[0] = NULL;
169
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
170
118
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
172
120
return new_plugin;
173
121
}
174
122
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
static bool add_to_char_array(const char *new, char ***array,
178
int *len){
179
/* Resize the pointed-to array to hold one more pointer */
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);
185
/* Malloc check */
186
if(new_array == NULL){
187
return false;
188
}
189
*array = new_array;
190
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
195
if(copy == NULL){
196
return false;
197
}
198
/* Insert the copy */
199
(*array)[*len] = copy;
200
(*len)++;
201
/* Add a new terminating NULL pointer to the last element */
202
(*array)[*len] = NULL;
203
return true;
204
}
205
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
static bool add_argument(plugin *p, const char *arg){
209
if(p == NULL){
210
return false;
211
}
212
return add_to_char_array(arg, &(p->argv), &(p->argc));
213
}
214
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
218
if(p == NULL){
219
return false;
220
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment 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
}
238
return true;
239
}
240
}
241
return add_to_char_array(def, &(p->environ), &(p->envc));
242
}
243
244
#ifndef O_CLOEXEC
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
132
}
133
245
134
/*
246
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
136
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
138
*/
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));
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
253
142
/* If reading the flags failed, return error indication now. */
254
143
if(ret < 0){
255
144
return ret;
256
145
}
257
146
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
148
}
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
265
153
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
while(true){
269
plugin *proc = plugin_list;
270
int status;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
272
if(pid == 0){
273
/* Only still running child processes */
274
break;
275
}
276
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
280
}
281
error(0, errno, "waitpid");
282
}
283
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
286
proc = proc->next;
287
}
288
if(proc == NULL){
289
/* Process not found in process list */
290
continue;
291
}
292
proc->status = status;
293
proc->completed = 1;
294
}
295
errno = old_errno;
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
296
171
}
297
172
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
301
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
302
178
for(size_t written = 0; written < length; written += (size_t)ret){
303
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
180
length - written));
309
185
return true;
310
186
}
311
187
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
static void free_plugin(plugin *plugin_node){
315
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->name);
320
free(plugin_node->argv);
321
for(char **env = plugin_node->environ; *env != NULL; env++){
322
free(*env);
323
}
324
free(plugin_node->environ);
325
free(plugin_node->buffer);
326
327
/* Removes the plugin from the singly-linked list */
328
if(plugin_node == plugin_list){
329
/* First one - simple */
330
plugin_list = plugin_list->next;
331
} else {
332
/* Second one or later */
333
for(plugin *p = plugin_list; p != NULL; p = p->next){
334
if(p->next == plugin_node){
335
p->next = plugin_node->next;
336
break;
337
}
338
}
339
}
340
341
free(plugin_node);
342
}
343
344
static void free_plugin_list(void){
345
while(plugin_list != NULL){
346
free_plugin(plugin_list);
347
}
348
}
349
350
188
int main(int argc, char *argv[]){
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
char *argfile = NULL;
354
FILE *conffp;
355
struct dirent **direntries = NULL;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
190
size_t d_name_len;
191
DIR *dir = NULL;
192
struct dirent *dirst;
356
193
struct stat st;
357
194
fd_set rfds_all;
358
195
int ret, maxfd = 0;
359
ssize_t sret;
360
196
uid_t uid = 65534;
361
197
gid_t gid = 65534;
362
198
bool debug = false;
364
200
struct sigaction old_sigchld_action;
365
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
366
202
.sa_flags = SA_NOCLDSTOP };
367
char **custom_argv = NULL;
368
int custom_argc = 0;
369
int dir_fd = -1;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
370
205
371
206
/* Establish a signal handler */
372
207
sigemptyset(&sigchld_action.sa_mask);
373
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
377
goto fallback;
209
if(ret < 0){
210
perror("sigaddset");
211
exit(EXIT_FAILURE);
378
212
}
379
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
383
goto fallback;
214
if(ret < 0){
215
perror("sigaction");
216
exit(EXIT_FAILURE);
384
217
}
385
218
386
219
/* The options we understand. */
388
221
{ .name = "global-options", .key = 'g',
389
222
.arg = "OPTION[,OPTION[,...]]",
390
223
.doc = "Options passed to all plugins" },
391
{ .name = "global-env", .key = 'G',
392
.arg = "VAR=value",
393
.doc = "Environment variable passed to all plugins" },
394
224
{ .name = "options-for", .key = 'o',
395
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
396
226
.doc = "Options passed only to specified plugin" },
397
{ .name = "env-for", .key = 'E',
398
.arg = "PLUGIN:ENV=value",
399
.doc = "Environment variable passed to specified plugin" },
400
227
{ .name = "disable", .key = 'd',
401
228
.arg = "PLUGIN",
402
229
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
406
230
{ .name = "plugin-dir", .key = 128,
407
231
.arg = "DIRECTORY",
408
232
.doc = "Specify a different plugin directory", .group = 2 },
409
{ .name = "config-file", .key = 129,
410
.arg = "FILE",
411
.doc = "Specify a different configuration file", .group = 2 },
412
{ .name = "userid", .key = 130,
413
.arg = "ID", .flags = 0,
414
.doc = "User ID the plugins will run as", .group = 3 },
415
{ .name = "groupid", .key = 131,
416
.arg = "ID", .flags = 0,
417
.doc = "Group ID the plugins will run as", .group = 3 },
418
{ .name = "debug", .key = 132,
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 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
433
241
{ .name = NULL }
434
242
};
435
243
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;
442
case 'g': /* --global-options */
443
{
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;
456
}
457
break;
458
case 'o': /* --options-for */
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;
477
}
478
}
479
errno = 0;
480
}
481
break;
482
case 'E': /* --env-for */
483
{
484
char *envdef = strchr(arg, ':');
485
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
491
envdef++;
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;
499
}
500
}
501
break;
502
case 'd': /* --disable */
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
}
518
}
519
break;
520
case 128: /* --plugin-dir */
521
free(plugindir);
522
plugindir = strdup(arg);
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 */
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
280
uid = (uid_t)strtol(arg, NULL, 10);
281
break;
282
case 130:
283
gid = (gid_t)strtol(arg, NULL, 10);
284
break;
285
case 131:
553
286
debug = true;
554
287
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);
617
argfile = strdup(arg);
618
if(argfile != NULL){
619
errno = 0;
620
}
621
break;
622
case 130: /* --userid */
623
case 131: /* --groupid */
624
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
629
case ARGP_KEY_ARG:
630
break;
631
default:
632
return ARGP_ERR_UNKNOWN;
633
}
634
return errno;
635
}
636
637
struct argp argp = { .options = options,
638
.parser = parse_opt_config_file,
639
.args_doc = "",
288
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
640
306
.doc = "Mandos plugin runner -- Run plugins" };
641
307
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;
658
goto fallback;
659
}
660
661
/* Reset to the normal argument parser */
662
argp.parser = parse_opt;
663
664
/* Open the configfile if available */
665
if(argfile == NULL){
666
conffp = fopen(AFILE, "r");
667
} else {
668
conffp = fopen(argfile, "r");
669
}
670
if(conffp != NULL){
671
char *org_line = NULL;
672
char *p, *arg, *new_arg, *line;
673
size_t size = 0;
674
const char whitespace_delims[] = " \r\t\f\v\n";
675
const char comment_delim[] = "#";
676
677
custom_argc = 1;
678
custom_argv = malloc(sizeof(char*) * 2);
679
if(custom_argv == NULL){
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
682
goto fallback;
683
}
684
custom_argv[0] = argv[0];
685
custom_argv[1] = NULL;
686
687
/* for each line in the config file, strip whitespace and ignore
688
commented text */
689
while(true){
690
sret = getline(&org_line, &size, conffp);
691
if(sret == -1){
692
break;
693
}
694
695
line = org_line;
696
arg = strsep(&line, comment_delim);
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
698
if(p[0] == '\0'){
699
continue;
700
}
701
new_arg = strdup(p);
702
if(new_arg == NULL){
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
705
free(org_line);
706
goto fallback;
707
}
708
709
custom_argc += 1;
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
}
722
}
723
custom_argv[custom_argc-1] = new_arg;
724
custom_argv[custom_argc] = NULL;
725
}
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
}
735
free(org_line);
736
} else {
737
/* Check for harmful errors and go to fallback. Other errors might
738
not affect opening plugins */
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
742
goto fallback;
743
}
744
}
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
747
if(custom_argv != NULL){
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);
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
310
fprintf(stderr, "Unknown error while parsing arguments\n");
311
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
325
perror("malloc");
326
exitstatus = EXIT_FAILURE;
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
if (ret == ARGP_ERR_UNKNOWN){
347
fprintf(stderr, "Unknown error while parsing arguments\n");
348
exitstatus = EXIT_FAILURE;
349
goto end;
800
350
}
801
351
}
802
352
803
353
if(debug){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
805
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
806
356
p->name ? p->name : "Global", p->argc - 1);
807
357
for(char **a = p->argv; *a != NULL; a++){
808
358
fprintf(stderr, "\tArg: %s\n", *a);
809
359
}
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
811
for(char **a = p->environ; *a != NULL; a++){
812
fprintf(stderr, "\t%s\n", *a);
813
}
814
}
815
}
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
}
360
}
361
}
362
846
363
ret = setuid(uid);
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
364
if (ret == -1){
365
perror("setuid");
366
}
367
368
setgid(gid);
369
if (ret == -1){
370
perror("setgid");
371
}
372
373
dir = opendir(plugindir);
374
if(dir == NULL){
375
perror("Could not open plugin dir");
376
exitstatus = EXIT_FAILURE;
377
goto end;
378
}
379
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
852
381
{
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;
382
int dir_fd = dirfd(dir);
383
if(dir_fd >= 0){
384
ret = set_cloexec_flag(dir_fd);
385
if(ret < 0){
386
perror("set_cloexec_flag");
387
exitstatus = EXIT_FAILURE;
388
goto end;
897
389
}
898
390
}
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;
909
391
}
910
392
911
393
FD_ZERO(&rfds_all);
912
394
913
/* Read and execute any executable in the plugin directory*/
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
930
/* Ignore non-executable files */
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)){
395
while(true){
396
dirst = readdir(dir);
397
398
// All directory entries have been processed
399
if(dirst == NULL){
400
if (errno == EBADF){
401
perror("readdir");
402
exitstatus = EXIT_FAILURE;
403
goto end;
404
}
405
break;
406
}
407
408
d_name_len = strlen(dirst->d_name);
409
410
// Ignore dotfiles, backup files and other junk
411
{
412
bool bad_name = false;
413
414
const char const *bad_prefixes[] = { ".", "#", NULL };
415
416
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
".dpkg-old",
418
".dpkg-divert", NULL };
419
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
size_t pre_len = strlen(*pre);
421
if((d_name_len >= pre_len)
422
and strncmp((dirst->d_name), *pre, pre_len) == 0){
423
if(debug){
424
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
425
" with bad prefix %s\n", dirst->d_name, *pre);
426
}
427
bad_name = true;
428
break;
429
}
430
}
431
432
if(bad_name){
433
continue;
434
}
435
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
size_t suf_len = strlen(*suf);
438
if((d_name_len >= suf_len)
439
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
440
== 0)){
441
if(debug){
442
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
443
" with bad suffix %s\n", dirst->d_name, *suf);
444
}
445
bad_name = true;
446
break;
447
}
448
}
449
450
if(bad_name){
451
continue;
452
}
453
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
464
465
ret = stat(filename, &st);
466
if (ret == -1){
467
perror("stat");
468
exitstatus = EXIT_FAILURE;
469
goto end;
470
}
471
472
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
934
473
if(debug){
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);
474
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
475
" with bad type or mode\n", filename);
939
476
}
940
close(plugin_fd);
941
free(direntries[i]);
942
continue;
943
}
944
945
plugin *p = getplugin(direntries[i]->d_name);
946
if(p == NULL){
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
950
continue;
951
}
952
if(p->disabled){
477
free(filename);
478
continue;
479
}
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
953
481
if(debug){
954
482
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
955
direntries[i]->d_name);
483
dirst->d_name);
956
484
}
957
close(plugin_fd);
958
free(direntries[i]);
485
free(filename);
959
486
continue;
960
487
}
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
961
489
{
962
490
/* Add global arguments to argument list for this plugin */
963
plugin *g = getplugin(NULL);
964
if(g != NULL){
965
for(char **a = g->argv + 1; *a != NULL; a++){
966
if(not add_argument(p, *a)){
967
error(0, errno, "add_argument");
968
}
969
}
970
/* Add global environment variables */
971
for(char **e = g->environ; *e != NULL; e++){
972
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
974
}
975
}
976
}
977
}
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
980
if(p->environ[0] != NULL){
981
for(char **e = environ; *e != NULL; e++){
982
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
984
}
985
}
986
}
987
988
int pipefd[2];
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
1010
/* Ask OS to automatic close the pipe on exec */
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
493
addargument(p, *a);
494
}
495
}
496
int pipefd[2];
497
ret = pipe(pipefd);
498
if (ret == -1){
499
perror("pipe");
500
exitstatus = EXIT_FAILURE;
501
goto end;
502
}
1011
503
ret = set_cloexec_flag(pipefd[0]);
1012
504
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1018
goto fallback;
505
perror("set_cloexec_flag");
506
exitstatus = EXIT_FAILURE;
507
goto end;
1019
508
}
1020
509
ret = set_cloexec_flag(pipefd[1]);
1021
510
if(ret < 0){
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
1027
goto fallback;
511
perror("set_cloexec_flag");
512
exitstatus = EXIT_FAILURE;
513
goto end;
1028
514
}
1029
#endif /* not O_CLOEXEC */
1030
515
/* Block SIGCHLD until process is safely in process list */
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
517
if(ret < 0){
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
1038
goto fallback;
1039
}
1040
/* Starting a new process to be watched */
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
1045
if(pid == -1){
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]);
1053
goto fallback;
1054
}
518
perror("sigprocmask");
519
exitstatus = EXIT_FAILURE;
520
goto end;
521
}
522
// Starting a new process to be watched
523
pid_t pid = fork();
1055
524
if(pid == 0){
1056
525
/* this is the child process */
1057
526
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
527
if(ret < 0){
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
528
perror("sigaction");
529
_exit(EXIT_FAILURE);
1061
530
}
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
531
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1063
532
if(ret < 0){
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
533
perror("sigprocmask");
534
_exit(EXIT_FAILURE);
1066
535
}
1067
536
1068
537
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1069
538
if(ret == -1){
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
539
perror("dup2");
540
_exit(EXIT_FAILURE);
1072
541
}
1073
542
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);
543
if(dirfd(dir) < 0){
544
/* If dir has no file descriptor, we could not set FD_CLOEXEC
545
above and must now close it manually here. */
546
closedir(dir);
547
}
548
if(execv(filename, p->argv) < 0){
549
perror("execv");
550
_exit(EXIT_FAILURE);
1080
551
}
1081
552
/* no return */
1082
553
}
1083
/* Parent process */
1084
close(pipefd[1]); /* Close unused write end of pipe */
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)));
554
/* parent process */
555
free(filename);
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
559
perror("malloc");
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
561
if(ret < 0){
1093
error(0, errno, "sigprocmask");
562
perror("sigprocmask");
1094
563
}
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
1097
goto fallback;
564
exitstatus = EXIT_FAILURE;
565
goto end;
1098
566
}
1099
free(direntries[i]);
1100
567
1101
new_plugin->pid = pid;
1102
new_plugin->fd = pipefd[0];
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
568
*new_process = (struct process){ .pid = pid,
569
.fd = pipefd[0],
570
.next = process_list };
571
// List handling
572
process_list = new_process;
1109
573
/* Unblock SIGCHLD so signal handler can be run if this process
1110
574
has already completed */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
575
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
576
if(ret < 0){
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
1117
goto fallback;
1118
}
1119
1120
FD_SET(new_plugin->fd, &rfds_all);
1121
1122
if(maxfd < new_plugin->fd){
1123
maxfd = new_plugin->fd;
1124
}
1125
}
1126
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
1134
if(p->pid != 0){
1135
break;
1136
}
1137
if(p->next == NULL){
1138
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1139
" directory?\n");
1140
free_plugin_list();
1141
}
1142
}
1143
1144
/* Main loop while running plugins exist */
1145
while(plugin_list){
577
perror("sigprocmask");
578
exitstatus = EXIT_FAILURE;
579
goto end;
580
}
581
582
FD_SET(new_process->fd, &rfds_all);
583
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
586
}
587
588
}
589
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
594
free(plugin_list);
595
}
596
597
closedir(dir);
598
dir = NULL;
599
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
602
" directory?\n");
603
process_list = NULL;
604
}
605
while(process_list){
1146
606
fd_set rfds = rfds_all;
1147
607
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
1151
goto fallback;
608
if (select_ret == -1){
609
perror("select");
610
exitstatus = EXIT_FAILURE;
611
goto end;
1152
612
}
1153
613
/* OK, now either a process completed, or something can be read
1154
614
from one of them */
1155
for(plugin *proc = plugin_list; proc != NULL;){
615
for(process *proc = process_list; proc ; proc = proc->next){
1156
616
/* Is this process completely done? */
1157
if(proc->completed and proc->eof){
617
if(proc->eof and proc->completed){
1158
618
/* Only accept the plugin output if it exited cleanly */
1159
619
if(not WIFEXITED(proc->status)
1160
620
or WEXITSTATUS(proc->status) != 0){
1161
621
/* Bad exit by plugin */
1162
1163
622
if(debug){
1164
623
if(WIFEXITED(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
624
fprintf(stderr, "Plugin %u exited with status %d\n",
625
(unsigned int) (proc->pid),
1168
626
WEXITSTATUS(proc->status));
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)));
627
} else if(WIFSIGNALED(proc->status)) {
628
fprintf(stderr, "Plugin %u killed by signal %d\n",
629
(unsigned int) (proc->pid),
630
WTERMSIG(proc->status));
631
} else if(WCOREDUMP(proc->status)){
632
fprintf(stderr, "Plugin %d dumped core\n",
633
(unsigned int) (proc->pid));
1175
634
}
1176
635
}
1177
1178
636
/* Remove the plugin */
1179
637
FD_CLR(proc->fd, &rfds_all);
1180
1181
638
/* Block signal while modifying process_list */
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1186
640
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1189
goto fallback;
1190
}
1191
1192
plugin *next_plugin = proc->next;
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
641
perror("sigprocmask");
642
exitstatus = EXIT_FAILURE;
643
goto end;
644
}
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
649
} else {
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
652
if(p->next == proc){
653
p->next = proc->next;
654
break;
655
}
656
}
657
}
1196
658
/* We are done modifying process list, so unblock signal */
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
659
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
660
NULL);
1200
661
if(ret < 0){
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
1203
goto fallback;
1204
}
1205
1206
if(plugin_list == NULL){
1207
break;
1208
}
1209
1210
continue;
662
perror("sigprocmask");
663
}
664
free(proc->buffer);
665
free(proc);
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
668
the process list */
669
break;
1211
670
}
1212
1213
671
/* This process exited nicely, so print its buffer */
1214
1215
bool bret = print_out_password(proc->buffer,
1216
proc->buffer_length);
672
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1217
674
if(not bret){
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
675
perror("print_out_password");
676
exitstatus = EXIT_FAILURE;
1220
677
}
1221
goto fallback;
678
goto end;
1222
679
}
1223
1224
680
/* This process has not completed. Does it have any output? */
1225
681
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1226
682
/* This process had nothing to say at this time */
1227
proc = proc->next;
1228
683
continue;
1229
684
}
1230
685
/* Before reading, make the process' data buffer large enough */
1231
686
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
1237
goto fallback;
687
proc->buffer = realloc(proc->buffer, proc->buffer_size
688
+ (size_t) BUFFER_SIZE);
689
if (proc->buffer == NULL){
690
perror("malloc");
691
exitstatus = EXIT_FAILURE;
692
goto end;
1238
693
}
1239
proc->buffer = new_buffer;
1240
694
proc->buffer_size += BUFFER_SIZE;
1241
695
}
1242
696
/* Read from the process */
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
697
ret = read(proc->fd, proc->buffer + proc->buffer_length,
698
BUFFER_SIZE);
699
if(ret < 0){
1248
700
/* Read error from this process; ignore the error */
1249
proc = proc->next;
1250
701
continue;
1251
702
}
1252
if(sret == 0){
703
if(ret == 0){
1253
704
/* got EOF */
1254
705
proc->eof = true;
1255
706
} else {
1256
proc->buffer_length += (size_t) sret;
707
proc->buffer_length += (size_t) ret;
1257
708
}
1258
709
}
1259
710
}
1260
711
1261
1262
fallback:
1263
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
1266
/* Fallback if all plugins failed, none are found or an error
1267
occured */
712
if(process_list == NULL){
1268
713
bool bret;
1269
714
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1270
715
char *passwordbuffer = getpass("Password: ");
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);
716
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1278
717
if(not bret){
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
718
perror("print_out_password");
719
exitstatus = EXIT_FAILURE;
720
goto end;
1281
721
}
1282
722
}
723
724
end:
1283
725
1284
726
/* Restore old signal handler */
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1286
if(ret == -1){
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1289
}
1290
1291
if(custom_argv != NULL){
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1293
free(*arg);
1294
}
1295
free(custom_argv);
1296
}
1297
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1302
}
1303
1304
/* Kill the processes */
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1306
if(p->pid != 0){
1307
close(p->fd);
1308
ret = kill(p->pid, SIGTERM);
1309
if(ret == -1 and errno != ESRCH){
1310
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1312
}
1313
}
727
sigaction(SIGCHLD, &old_sigchld_action, NULL);
728
729
free(plus_argv);
730
731
/* Free the plugin list */
732
for(plugin *next; plugin_list != NULL; plugin_list = next){
733
next = plugin_list->next;
734
free(plugin_list->argv);
735
free(plugin_list);
736
}
737
738
if(dir != NULL){
739
closedir(dir);
740
}
741
742
/* Free the process list and kill the processes */
743
for(process *next; process_list != NULL; process_list = next){
744
next = process_list->next;
745
close(process_list->fd);
746
ret = kill(process_list->pid, SIGTERM);
747
if(ret == -1 and errno != ESRCH){
748
/* set-uid proccesses migth not get closed */
749
perror("kill");
750
}
751
free(process_list->buffer);
752
free(process_list);
1314
753
}
1315
754
1316
755
/* Wait for any remaining child processes to terminate */
1317
do {
756
do{
1318
757
ret = wait(NULL);
1319
758
} while(ret >= 0);
1320
759
if(errno != ECHILD){
1321
error(0, errno, "wait");
760
perror("wait");
1322
761
}
1323
762
1324
free_plugin_list();
1325
1326
free(plugindir);
1327
free(pluginhelperdir);
1328
free(argfile);
1329
1330
763
return exitstatus;
1331
764
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0