To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 759
- compare with another revision
- download diff
- download tarball
- view history from revision 759
- Committer: Teddy Hogeborn
- Date: 2015-07-06 20:29:34 UTC
- mfrom: (738.1.6 route-external)
- Revision ID: teddy@recompile.se-20150706202934-09j06jm2fiw1bn80
Merge change to add local route when network is "unreachable".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
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
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#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() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
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
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
77
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>";
86
84
87
85
typedef struct plugin{
88
86
char *name; /* can be NULL or any plugin name */
91
89
char **environ;
92
90
int envc;
93
91
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
101
115
return p;
102
116
}
103
117
}
104
118
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
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){
107
124
return NULL;
108
125
}
109
126
char *copy_name = NULL;
110
127
if(name != NULL){
111
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
112
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
113
135
return NULL;
114
136
}
115
137
}
116
138
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
122
143
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
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;
125
149
free(copy_name);
126
150
free(new_plugin);
151
errno = e;
127
152
return NULL;
128
153
}
129
154
new_plugin->argv[0] = copy_name;
130
155
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
133
160
if(new_plugin->environ == NULL){
161
int e = errno;
134
162
free(copy_name);
135
163
free(new_plugin->argv);
136
164
free(new_plugin);
165
errno = e;
137
166
return NULL;
138
167
}
139
168
new_plugin->environ[0] = NULL;
169
140
170
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
142
172
return new_plugin;
143
173
}
144
174
145
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
146
177
static bool add_to_char_array(const char *new, char ***array,
147
178
int *len){
148
179
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (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);
151
185
/* Malloc check */
152
if(*array == NULL){
186
if(new_array == NULL){
153
187
return false;
154
188
}
189
*array = new_array;
155
190
/* Make a copy of the new string */
156
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
157
195
if(copy == NULL){
158
196
return false;
159
197
}
166
204
}
167
205
168
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
169
208
static bool add_argument(plugin *p, const char *arg){
170
209
if(p == NULL){
171
210
return false;
174
213
}
175
214
176
215
/* Add to a plugin's environment */
177
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){
178
218
if(p == NULL){
179
219
return false;
180
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
}
181
241
return add_to_char_array(def, &(p->environ), &(p->envc));
182
242
}
183
243
184
244
#ifndef O_CLOEXEC
185
245
/*
186
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
247
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
249
*/
190
static int set_cloexec_flag(int fd)
191
{
192
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));
193
253
/* If reading the flags failed, return error indication now. */
194
254
if(ret < 0){
195
255
return ret;
196
256
}
197
257
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
199
260
}
261
#endif /* not O_CLOEXEC */
200
262
201
process *process_list = NULL;
202
263
203
264
/* Mark processes as completed when they exit, and save their exit
204
265
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
206
268
while(true){
207
process *proc = process_list;
269
plugin *proc = plugin_list;
208
270
int status;
209
271
pid_t pid = waitpid(-1, &status, WNOHANG);
210
272
if(pid == 0){
212
274
break;
213
275
}
214
276
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
217
280
}
218
/* No child processes */
219
break;
281
error(0, errno, "waitpid");
220
282
}
221
283
222
284
/* A child exited, find it in process_list */
223
285
while(proc != NULL and proc->pid != pid){
224
286
proc = proc->next;
228
290
continue;
229
291
}
230
292
proc->status = status;
231
proc->completed = true;
293
proc->completed = 1;
232
294
}
295
errno = old_errno;
233
296
}
234
297
235
bool print_out_password(const char *buffer, size_t length){
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){
236
301
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
302
for(size_t written = 0; written < length; written += (size_t)ret){
241
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
304
length - written));
247
309
return true;
248
310
}
249
311
250
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
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; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->argv);
320
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(*env);
322
}
323
free(plugin_node->environ);
324
free(plugin_node->buffer);
325
326
/* Removes the plugin from the singly-linked list */
327
if(plugin_node == plugin_list){
328
/* First one - simple */
329
plugin_list = plugin_list->next;
330
} else {
331
/* Second one or later */
332
for(plugin *p = plugin_list; p != NULL; p = p->next){
333
if(p->next == plugin_node){
334
p->next = plugin_node->next;
335
break;
336
}
337
}
338
}
339
340
free(plugin_node);
341
}
342
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
262
346
}
263
347
}
264
348
265
349
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
268
353
FILE *conffp;
269
size_t d_name_len;
270
DIR *dir = NULL;
271
struct dirent *dirst;
354
struct dirent **direntries = NULL;
272
355
struct stat st;
273
356
fd_set rfds_all;
274
357
int ret, maxfd = 0;
358
ssize_t sret;
275
359
uid_t uid = 65534;
276
360
gid_t gid = 65534;
277
361
bool debug = false;
281
365
.sa_flags = SA_NOCLDSTOP };
282
366
char **custom_argv = NULL;
283
367
int custom_argc = 0;
368
int dir_fd = -1;
284
369
285
370
/* Establish a signal handler */
286
371
sigemptyset(&sigchld_action.sa_mask);
287
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
288
373
if(ret == -1){
289
perror("sigaddset");
290
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
291
376
goto fallback;
292
377
}
293
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
294
379
if(ret == -1){
295
perror("sigaction");
296
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
297
382
goto fallback;
298
383
}
299
384
302
387
{ .name = "global-options", .key = 'g',
303
388
.arg = "OPTION[,OPTION[,...]]",
304
389
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
390
{ .name = "global-env", .key = 'G',
306
391
.arg = "VAR=value",
307
392
.doc = "Environment variable passed to all plugins" },
308
393
{ .name = "options-for", .key = 'o',
309
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
395
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
396
{ .name = "env-for", .key = 'E',
312
397
.arg = "PLUGIN:ENV=value",
313
398
.doc = "Environment variable passed to specified plugin" },
314
399
{ .name = "disable", .key = 'd',
315
400
.arg = "PLUGIN",
316
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
317
405
{ .name = "plugin-dir", .key = 128,
318
406
.arg = "DIRECTORY",
319
407
.doc = "Specify a different plugin directory", .group = 2 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
408
{ .name = "config-file", .key = 129,
409
.arg = "FILE",
410
.doc = "Specify a different configuration file", .group = 2 },
411
{ .name = "userid", .key = 130,
412
.arg = "ID", .flags = 0,
413
.doc = "User ID the plugins will run as", .group = 3 },
414
{ .name = "groupid", .key = 131,
415
.arg = "ID", .flags = 0,
416
.doc = "Group ID the plugins will run as", .group = 3 },
417
{ .name = "debug", .key = 132,
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
328
432
{ .name = NULL }
329
433
};
330
434
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
335
switch (key) {
336
case 'g':
337
if (arg != NULL){
338
char *p;
339
while((p = strsep(&arg, ",")) != NULL){
340
if(p[0] == '\0'){
341
continue;
342
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
344
perror("add_argument");
345
return ARGP_ERR_UNKNOWN;
346
}
347
}
348
}
349
break;
350
case 'e':
351
if(arg == NULL){
352
break;
353
}
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
362
}
363
break;
364
case 'o':
365
if (arg != NULL){
366
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
368
break;
369
}
370
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
372
break;
373
}
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
}
387
break;
388
case 'f':
389
if(arg == NULL){
390
break;
391
}
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
441
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
447
}
448
}
449
errno = 0;
450
}
451
break;
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
456
break;
457
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
479
}
480
break;
481
case 'E': /* --env-for */
392
482
{
393
483
char *envdef = strchr(arg, ':');
394
484
if(envdef == NULL){
395
break;
396
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
401
490
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
410
if(p == NULL){
411
return ARGP_ERR_UNKNOWN;
412
}
413
p->disabled = true;
414
}
415
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
420
uid = (uid_t)strtol(arg, NULL, 10);
421
break;
422
case 130:
423
gid = (gid_t)strtol(arg, NULL, 10);
424
break;
425
case 131:
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
499
}
500
break;
501
case 'd': /* --disable */
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
517
}
518
break;
519
case 128: /* --plugin-dir */
520
free(plugindir);
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
break;
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
break;
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
break;
551
case 132: /* --debug */
426
552
debug = true;
427
553
break;
428
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
default:
587
return ARGP_ERR_UNKNOWN;
588
}
589
return errno; /* Set to 0 at start */
590
}
591
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
606
break;
607
case 129: /* --config-file */
608
free(argfile);
609
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
612
}
613
break;
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
case ARGP_KEY_ARG:
622
break;
623
default:
624
return ARGP_ERR_UNKNOWN;
625
}
626
return errno;
627
}
628
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
443
632
.doc = "Mandos plugin runner -- Run plugins" };
444
633
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
447
fprintf(stderr, "Unknown error while parsing arguments\n");
448
exitstatus = EXIT_FAILURE;
449
goto fallback;
450
}
451
452
conffp = fopen(argfile, "r");
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
650
goto fallback;
651
}
652
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
655
656
/* Open the configfile if available */
657
if(argfile == NULL){
658
conffp = fopen(AFILE, "r");
659
} else {
660
conffp = fopen(argfile, "r");
661
}
453
662
if(conffp != NULL){
454
663
char *org_line = NULL;
455
664
char *p, *arg, *new_arg, *line;
456
665
size_t size = 0;
457
ssize_t sret;
458
666
const char whitespace_delims[] = " \r\t\f\v\n";
459
667
const char comment_delim[] = "#";
460
668
461
669
custom_argc = 1;
462
670
custom_argv = malloc(sizeof(char*) * 2);
463
671
if(custom_argv == NULL){
464
perror("malloc");
465
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
466
674
goto fallback;
467
675
}
468
676
custom_argv[0] = argv[0];
469
677
custom_argv[1] = NULL;
470
678
679
/* for each line in the config file, strip whitespace and ignore
680
commented text */
471
681
while(true){
472
682
sret = getline(&org_line, &size, conffp);
473
683
if(sret == -1){
474
684
break;
475
685
}
476
686
477
687
line = org_line;
478
688
arg = strsep(&line, comment_delim);
479
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
481
691
continue;
482
692
}
483
693
new_arg = strdup(p);
484
694
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
697
free(org_line);
698
goto fallback;
699
}
700
485
701
custom_argc += 1;
486
custom_argv = realloc(custom_argv, sizeof(char *)
487
* ((unsigned int) custom_argc + 1));
488
if(custom_argv == NULL){
489
perror("realloc");
490
exitstatus = EXIT_FAILURE;
491
free(org_line);
492
goto fallback;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((unsigned int)
705
custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
493
715
}
494
716
custom_argv[custom_argc-1] = new_arg;
495
custom_argv[custom_argc] = NULL;
717
custom_argv[custom_argc] = NULL;
496
718
}
497
719
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
498
728
free(org_line);
499
} else{
729
} else {
500
730
/* Check for harmful errors and go to fallback. Other errors might
501
731
not affect opening plugins */
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
perror("fopen");
504
exitstatus = EXIT_FAILURE;
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
505
735
goto fallback;
506
736
}
507
737
}
508
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
509
740
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
512
fprintf(stderr, "Unknown error while parsing arguments\n");
513
exitstatus = EXIT_FAILURE;
514
goto fallback;
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
755
goto fallback;
756
}
757
}
758
759
/* Parse actual command line arguments, to let them override the
760
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
515
793
}
516
794
}
517
795
522
800
for(char **a = p->argv; *a != NULL; a++){
523
801
fprintf(stderr, "\tArg: %s\n", *a);
524
802
}
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
526
804
for(char **a = p->environ; *a != NULL; a++){
527
805
fprintf(stderr, "\t%s\n", *a);
528
806
}
529
807
}
530
808
}
531
809
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<http://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
TEMP_FAILURE_RETRY(close(plugindir_fd));
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
532
839
ret = setuid(uid);
533
if (ret == -1){
534
perror("setuid");
535
}
536
537
setgid(gid);
538
if (ret == -1){
539
perror("setgid");
540
}
541
542
dir = opendir(plugindir);
543
if(dir == NULL){
544
perror("Could not open plugin dir");
545
exitstatus = EXIT_FAILURE;
546
goto fallback;
547
}
548
549
/* Set the FD_CLOEXEC flag on the directory, if possible */
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
550
845
{
551
int dir_fd = dirfd(dir);
552
if(dir_fd >= 0){
553
ret = set_cloexec_flag(dir_fd);
554
if(ret < 0){
555
perror("set_cloexec_flag");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
558
890
}
559
891
}
892
return 1;
893
}
894
895
#ifdef __GLIBC__
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
909
direntries = NULL;
910
exitstatus = EX_OSERR;
911
goto fallback;
560
912
}
561
913
562
914
FD_ZERO(&rfds_all);
563
915
564
while(true){
565
dirst = readdir(dir);
566
567
// All directory entries have been processed
568
if(dirst == NULL){
569
if (errno == EBADF){
570
perror("readdir");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
574
break;
575
}
576
577
d_name_len = strlen(dirst->d_name);
578
579
// Ignore dotfiles, backup files and other junk
580
{
581
bool bad_name = false;
582
583
const char const *bad_prefixes[] = { ".", "#", NULL };
584
585
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
".dpkg-old",
587
".dpkg-divert", NULL };
588
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
size_t pre_len = strlen(*pre);
590
if((d_name_len >= pre_len)
591
and strncmp((dirst->d_name), *pre, pre_len) == 0){
592
if(debug){
593
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
594
" with bad prefix %s\n", dirst->d_name, *pre);
595
}
596
bad_name = true;
597
break;
598
}
599
}
600
601
if(bad_name){
602
continue;
603
}
604
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
size_t suf_len = strlen(*suf);
607
if((d_name_len >= suf_len)
608
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
609
== 0)){
610
if(debug){
611
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
612
" with bad suffix %s\n", dirst->d_name, *suf);
613
}
614
bad_name = true;
615
break;
616
}
617
}
618
619
if(bad_name){
620
continue;
621
}
622
}
623
624
char *filename;
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
626
if(ret < 0){
627
perror("asprintf");
628
continue;
629
}
630
631
ret = stat(filename, &st);
632
if (ret == -1){
633
perror("stat");
634
free(filename);
635
continue;
636
}
637
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
916
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
918
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
920
if(plugin_fd == -1){
921
error(0, errno, "Could not open plugin");
922
free(direntries[i]);
923
continue;
924
}
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
926
if(ret == -1){
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
930
continue;
931
}
932
933
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
936
X_OK, 0)) != 0)){
639
937
if(debug){
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
" with bad type or mode\n", filename);
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
642
942
}
643
free(filename);
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
free(direntries[i]);
644
945
continue;
645
946
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
947
948
plugin *p = getplugin(direntries[i]->d_name);
647
949
if(p == NULL){
648
perror("getplugin");
649
free(filename);
950
error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
952
free(direntries[i]);
650
953
continue;
651
954
}
652
955
if(p->disabled){
653
956
if(debug){
654
957
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
655
dirst->d_name);
958
direntries[i]->d_name);
656
959
}
657
free(filename);
960
TEMP_FAILURE_RETRY(close(plugin_fd));
961
free(direntries[i]);
658
962
continue;
659
963
}
660
964
{
661
965
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
966
plugin *g = getplugin(NULL);
663
967
if(g != NULL){
664
968
for(char **a = g->argv + 1; *a != NULL; a++){
665
969
if(not add_argument(p, *a)){
666
perror("add_argument");
970
error(0, errno, "add_argument");
667
971
}
668
972
}
669
973
/* Add global environment variables */
670
974
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
672
perror("add_environment");
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
673
977
}
674
978
}
675
979
}
676
980
}
677
/* If this plugin has any environment variables, we will call
678
using execve and need to duplicate the environment from this
679
process, too. */
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
680
983
if(p->environ[0] != NULL){
681
984
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
688
perror("add_environment");
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
689
987
}
690
988
}
691
989
}
692
990
693
991
int pipefd[2];
694
ret = pipe(pipefd);
695
if (ret == -1){
696
perror("pipe");
697
exitstatus = EXIT_FAILURE;
698
goto fallback;
699
}
992
#ifndef O_CLOEXEC
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
997
if(ret == -1){
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1001
goto fallback;
1002
}
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1005
FD_SETSIZE);
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1010
goto fallback;
1011
}
1012
#ifndef O_CLOEXEC
1013
/* Ask OS to automatic close the pipe on exec */
700
1014
ret = set_cloexec_flag(pipefd[0]);
701
1015
if(ret < 0){
702
perror("set_cloexec_flag");
703
exitstatus = EXIT_FAILURE;
1016
error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
704
1021
goto fallback;
705
1022
}
706
1023
ret = set_cloexec_flag(pipefd[1]);
707
1024
if(ret < 0){
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
710
1030
goto fallback;
711
1031
}
1032
#endif /* not O_CLOEXEC */
712
1033
/* Block SIGCHLD until process is safely in process list */
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
714
1037
if(ret < 0){
715
perror("sigprocmask");
716
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
717
1041
goto fallback;
718
1042
}
719
// Starting a new process to be watched
720
pid_t pid = fork();
1043
/* Starting a new process to be watched */
1044
pid_t pid;
1045
do {
1046
pid = fork();
1047
} while(pid == -1 and errno == EINTR);
721
1048
if(pid == -1){
722
perror("fork");
723
exitstatus = EXIT_FAILURE;
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
TEMP_FAILURE_RETRY(close(pipefd[0]));
1053
TEMP_FAILURE_RETRY(close(pipefd[1]));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
724
1056
goto fallback;
725
1057
}
726
1058
if(pid == 0){
727
1059
/* this is the child process */
728
1060
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
729
1061
if(ret < 0){
730
perror("sigaction");
731
_exit(EXIT_FAILURE);
1062
error(0, errno, "sigaction");
1063
_exit(EX_OSERR);
732
1064
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
1066
if(ret < 0){
735
perror("sigprocmask");
736
_exit(EXIT_FAILURE);
1067
error(0, errno, "sigprocmask");
1068
_exit(EX_OSERR);
737
1069
}
738
1070
739
1071
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
1072
if(ret == -1){
741
perror("dup2");
742
_exit(EXIT_FAILURE);
1073
error(0, errno, "dup2");
1074
_exit(EX_OSERR);
743
1075
}
744
1076
745
if(dirfd(dir) < 0){
746
/* If dir has no file descriptor, we could not set FD_CLOEXEC
747
above and must now close it manually here. */
748
closedir(dir);
749
}
750
if(p->environ[0] == NULL){
751
if(execv(filename, p->argv) < 0){
752
perror("execv");
753
_exit(EXIT_FAILURE);
754
}
755
} else {
756
if(execve(filename, p->argv, p->environ) < 0){
757
perror("execve");
758
_exit(EXIT_FAILURE);
759
}
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
1082
_exit(EX_OSERR);
760
1083
}
761
1084
/* no return */
762
1085
}
763
/* parent process */
764
free(filename);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1086
/* Parent process */
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1088
pipe */
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
1091
if(new_plugin == NULL){
1092
error(0, errno, "getplugin");
1093
ret = (int)(TEMP_FAILURE_RETRY
1094
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1095
NULL)));
770
1096
if(ret < 0){
771
perror("sigprocmask");
1097
error(0, errno, "sigprocmask");
772
1098
}
773
exitstatus = EXIT_FAILURE;
1099
exitstatus = EX_OSERR;
1100
free(direntries[i]);
774
1101
goto fallback;
775
1102
}
776
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
1103
free(direntries[i]);
1104
1105
new_plugin->pid = pid;
1106
new_plugin->fd = pipefd[0];
1107
782
1108
/* Unblock SIGCHLD so signal handler can be run if this process
783
1109
has already completed */
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
785
1113
if(ret < 0){
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
1114
error(0, errno, "sigprocmask");
1115
exitstatus = EX_OSERR;
788
1116
goto fallback;
789
1117
}
790
1118
791
FD_SET(new_process->fd, &rfds_all);
792
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
795
}
796
797
}
798
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
closedir(dir);
803
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
809
}
810
while(process_list){
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wsign-conversion"
1123
#endif
1124
#endif
1125
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1126
-Wconversion in GNU libc
1127
before 2.16 */
1128
#if defined (__GNUC__) and defined (__GLIBC__)
1129
#if not __GLIBC_PREREQ(2, 16)
1130
#pragma GCC diagnostic pop
1131
#endif
1132
#endif
1133
1134
if(maxfd < new_plugin->fd){
1135
maxfd = new_plugin->fd;
1136
}
1137
}
1138
1139
free(direntries);
1140
direntries = NULL;
1141
TEMP_FAILURE_RETRY(close(dir_fd));
1142
dir_fd = -1;
1143
free_plugin(getplugin(NULL));
1144
1145
for(plugin *p = plugin_list; p != NULL; p = p->next){
1146
if(p->pid != 0){
1147
break;
1148
}
1149
if(p->next == NULL){
1150
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1151
" directory?\n");
1152
free_plugin_list();
1153
}
1154
}
1155
1156
/* Main loop while running plugins exist */
1157
while(plugin_list){
811
1158
fd_set rfds = rfds_all;
812
1159
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
if (select_ret == -1){
814
perror("select");
815
exitstatus = EXIT_FAILURE;
1160
if(select_ret == -1 and errno != EINTR){
1161
error(0, errno, "select");
1162
exitstatus = EX_OSERR;
816
1163
goto fallback;
817
1164
}
818
1165
/* OK, now either a process completed, or something can be read
819
1166
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
1167
for(plugin *proc = plugin_list; proc != NULL;){
821
1168
/* Is this process completely done? */
822
if(proc->eof and proc->completed){
1169
if(proc->completed and proc->eof){
823
1170
/* Only accept the plugin output if it exited cleanly */
824
1171
if(not WIFEXITED(proc->status)
825
1172
or WEXITSTATUS(proc->status) != 0){
826
1173
/* Bad exit by plugin */
1174
827
1175
if(debug){
828
1176
if(WIFEXITED(proc->status)){
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1178
" status %d\n", proc->name,
1179
(intmax_t) (proc->pid),
831
1180
WEXITSTATUS(proc->status));
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
835
WTERMSIG(proc->status));
1181
} else if(WIFSIGNALED(proc->status)){
1182
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1183
" signal %d: %s\n", proc->name,
1184
(intmax_t) (proc->pid),
1185
WTERMSIG(proc->status),
1186
strsignal(WTERMSIG(proc->status)));
836
1187
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
1188
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1189
" core\n", proc->name, (intmax_t) (proc->pid));
839
1190
}
840
1191
}
1192
841
1193
/* Remove the plugin */
842
FD_CLR(proc->fd, &rfds_all);
1194
#if defined (__GNUC__) and defined (__GLIBC__)
1195
#if not __GLIBC_PREREQ(2, 16)
1196
#pragma GCC diagnostic push
1197
#pragma GCC diagnostic ignored "-Wsign-conversion"
1198
#endif
1199
#endif
1200
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1201
-Wconversion in GNU libc
1202
before 2.16 */
1203
#if defined (__GNUC__) and defined (__GLIBC__)
1204
#if not __GLIBC_PREREQ(2, 16)
1205
#pragma GCC diagnostic pop
1206
#endif
1207
#endif
1208
843
1209
/* Block signal while modifying process_list */
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1210
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1211
(SIG_BLOCK,
1212
&sigchld_action.sa_mask,
1213
NULL));
845
1214
if(ret < 0){
846
perror("sigprocmask");
847
exitstatus = EXIT_FAILURE;
1215
error(0, errno, "sigprocmask");
1216
exitstatus = EX_OSERR;
848
1217
goto fallback;
849
1218
}
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
1219
1220
plugin *next_plugin = proc->next;
1221
free_plugin(proc);
1222
proc = next_plugin;
1223
863
1224
/* We are done modifying process list, so unblock signal */
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1225
ret = (int)(TEMP_FAILURE_RETRY
1226
(sigprocmask(SIG_UNBLOCK,
1227
&sigchld_action.sa_mask, NULL)));
866
1228
if(ret < 0){
867
perror("sigprocmask");
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
1229
error(0, errno, "sigprocmask");
1230
exitstatus = EX_OSERR;
1231
goto fallback;
1232
}
1233
1234
if(plugin_list == NULL){
1235
break;
1236
}
1237
1238
continue;
875
1239
}
1240
876
1241
/* This process exited nicely, so print its buffer */
877
1242
878
1243
bool bret = print_out_password(proc->buffer,
879
1244
proc->buffer_length);
880
1245
if(not bret){
881
perror("print_out_password");
882
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "print_out_password");
1247
exitstatus = EX_IOERR;
883
1248
}
884
1249
goto fallback;
885
1250
}
1251
886
1252
/* This process has not completed. Does it have any output? */
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1253
#if defined (__GNUC__) and defined (__GLIBC__)
1254
#if not __GLIBC_PREREQ(2, 16)
1255
#pragma GCC diagnostic push
1256
#pragma GCC diagnostic ignored "-Wsign-conversion"
1257
#endif
1258
#endif
1259
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1260
warning from
1261
-Wconversion
1262
in GNU libc
1263
before
1264
2.16 */
1265
#if defined (__GNUC__) and defined (__GLIBC__)
1266
#if not __GLIBC_PREREQ(2, 16)
1267
#pragma GCC diagnostic pop
1268
#endif
1269
#endif
888
1270
/* This process had nothing to say at this time */
1271
proc = proc->next;
889
1272
continue;
890
1273
}
891
1274
/* Before reading, make the process' data buffer large enough */
892
1275
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
893
proc->buffer = realloc(proc->buffer, proc->buffer_size
894
+ (size_t) BUFFER_SIZE);
895
if (proc->buffer == NULL){
896
perror("malloc");
897
exitstatus = EXIT_FAILURE;
1276
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1277
+ (size_t) BUFFER_SIZE);
1278
if(new_buffer == NULL){
1279
error(0, errno, "malloc");
1280
exitstatus = EX_OSERR;
898
1281
goto fallback;
899
1282
}
1283
proc->buffer = new_buffer;
900
1284
proc->buffer_size += BUFFER_SIZE;
901
1285
}
902
1286
/* Read from the process */
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1287
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1288
proc->buffer
1289
+ proc->buffer_length,
1290
BUFFER_SIZE));
1291
if(sret < 0){
906
1292
/* Read error from this process; ignore the error */
1293
proc = proc->next;
907
1294
continue;
908
1295
}
909
if(ret == 0){
1296
if(sret == 0){
910
1297
/* got EOF */
911
1298
proc->eof = true;
912
1299
} else {
913
proc->buffer_length += (size_t) ret;
1300
proc->buffer_length += (size_t) sret;
914
1301
}
915
1302
}
916
1303
}
917
918
1304
1305
919
1306
fallback:
920
1307
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1308
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1309
and exitstatus != EX_OK)){
922
1310
/* Fallback if all plugins failed, none are found or an error
923
1311
occured */
924
1312
bool bret;
925
1313
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1314
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1315
size_t len = strlen(passwordbuffer);
1316
/* Strip trailing newline */
1317
if(len > 0 and passwordbuffer[len-1] == '\n'){
1318
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1319
len--;
1320
}
1321
bret = print_out_password(passwordbuffer, len);
928
1322
if(not bret){
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1323
error(0, errno, "print_out_password");
1324
exitstatus = EX_IOERR;
931
1325
}
932
1326
}
933
1327
934
1328
/* Restore old signal handler */
935
1329
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
936
1330
if(ret == -1){
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
1331
error(0, errno, "sigaction");
1332
exitstatus = EX_OSERR;
939
1333
}
940
1334
941
1335
if(custom_argv != NULL){
942
1336
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1337
free(*arg);
944
1338
}
945
1339
free(custom_argv);
946
1340
}
947
free_plugin_list(plugin_list);
948
949
if(dir != NULL){
950
closedir(dir);
1341
1342
free(direntries);
1343
1344
if(dir_fd != -1){
1345
TEMP_FAILURE_RETRY(close(dir_fd));
951
1346
}
952
1347
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1348
/* Kill the processes */
1349
for(plugin *p = plugin_list; p != NULL; p = p->next){
1350
if(p->pid != 0){
1351
close(p->fd);
1352
ret = kill(p->pid, SIGTERM);
1353
if(ret == -1 and errno != ESRCH){
1354
/* Set-uid proccesses might not get closed */
1355
error(0, errno, "kill");
1356
}
961
1357
}
962
free(process_list->buffer);
963
free(process_list);
964
1358
}
965
1359
966
1360
/* Wait for any remaining child processes to terminate */
967
do{
1361
do {
968
1362
ret = wait(NULL);
969
1363
} while(ret >= 0);
970
1364
if(errno != ECHILD){
971
perror("wait");
1365
error(0, errno, "wait");
972
1366
}
973
1367
1368
free_plugin_list();
1369
1370
free(plugindir);
1371
free(pluginhelperdir);
1372
free(argfile);
1373
974
1374
return exitstatus;
975
1375
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0