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 541
- compare with another revision
- download diff
- download tarball
- view history from revision 541
- Committer: Teddy Hogeborn
- Date: 2011-12-31 20:07:11 UTC
- mfrom: (535.1.9 wireless-network-hook)
- Revision ID: teddy@recompile.se-20111231200711-6dli3r8drftem57r
Merge new wireless network hook. Fix bridge network hook to use
hardware addresses instead of interface names. Implement and document
new "CONNECT" environment variable for network hooks.
hardware addresses instead of interface names. Implement and document
new "CONNECT" environment variable for network hooks.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- 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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
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
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
59
61
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
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{
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
86
char **argv;
87
int argc;
88
char **environ;
89
int envc;
90
bool disabled;
91
92
/* Variables used for running processes*/
75
93
pid_t pid;
76
94
int fd;
77
95
char *buffer;
78
96
size_t buffer_size;
79
97
size_t buffer_length;
80
98
bool eof;
81
bool completed;
99
volatile sig_atomic_t completed;
82
100
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;
91
101
struct plugin *next;
92
102
} plugin;
93
103
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))){
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
98
113
return p;
99
114
}
100
115
}
101
116
/* Create a new plugin */
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;
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
122
return NULL;
123
}
124
char *copy_name = NULL;
125
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
return NULL;
134
}
135
}
136
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
141
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
147
free(copy_name);
148
free(new_plugin);
149
errno = e;
150
return NULL;
151
}
152
new_plugin->argv[0] = copy_name;
114
153
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
158
if(new_plugin->environ == NULL){
159
int e = errno;
160
free(copy_name);
161
free(new_plugin->argv);
162
free(new_plugin);
163
errno = e;
164
return NULL;
165
}
166
new_plugin->environ[0] = NULL;
167
118
168
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
120
170
return new_plugin;
121
171
}
122
172
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;
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
static bool add_to_char_array(const char *new, char ***array,
176
int *len){
177
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
182
/* Malloc check */
183
if(*array == NULL){
184
return false;
185
}
186
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
191
if(copy == NULL){
192
return false;
193
}
194
/* Insert the copy */
195
(*array)[*len] = copy;
196
(*len)++;
197
/* Add a new terminating NULL pointer to the last element */
198
(*array)[*len] = NULL;
199
return true;
200
}
201
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
static bool add_argument(plugin *p, const char *arg){
205
if(p == NULL){
206
return false;
207
}
208
return add_to_char_array(arg, &(p->argv), &(p->argc));
209
}
210
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
214
if(p == NULL){
215
return false;
216
}
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
223
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
229
return false;
230
}
231
*e = new;
232
strcpy(*e, def);
233
}
234
return true;
235
}
236
}
237
return add_to_char_array(def, &(p->environ), &(p->envc));
132
238
}
133
239
134
240
/*
135
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
136
242
* Descriptor Flags".
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
138
244
*/
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
142
247
/* If reading the flags failed, return error indication now. */
143
248
if(ret < 0){
144
249
return ret;
145
250
}
146
251
/* Store modified flag word in the descriptor. */
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
148
254
}
149
255
150
process *process_list = NULL;
151
256
152
/* Mark a process as completed when it exits, and save its exit
257
/* Mark processes as completed when they exit, and save their exit
153
258
status. */
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;
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
261
while(true){
262
plugin *proc = plugin_list;
263
int status;
264
pid_t pid = waitpid(-1, &status, WNOHANG);
265
if(pid == 0){
266
/* Only still running child processes */
267
break;
268
}
269
if(pid == -1){
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
273
}
274
error(0, errno, "waitpid");
275
}
276
277
/* A child exited, find it in process_list */
278
while(proc != NULL and proc->pid != pid){
279
proc = proc->next;
280
}
281
if(proc == NULL){
282
/* Process not found in process list */
283
continue;
284
}
285
proc->status = status;
286
proc->completed = 1;
287
}
288
errno = old_errno;
171
289
}
172
290
173
bool print_out_password(const char *buffer, size_t length){
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
174
294
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
295
for(size_t written = 0; written < length; written += (size_t)ret){
179
296
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
297
length - written));
185
302
return true;
186
303
}
187
304
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
static void free_plugin(plugin *plugin_node){
308
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
310
free(*arg);
311
}
312
free(plugin_node->argv);
313
for(char **env = plugin_node->environ; *env != NULL; env++){
314
free(*env);
315
}
316
free(plugin_node->environ);
317
free(plugin_node->buffer);
318
319
/* Removes the plugin from the singly-linked list */
320
if(plugin_node == plugin_list){
321
/* First one - simple */
322
plugin_list = plugin_list->next;
323
} else {
324
/* Second one or later */
325
for(plugin *p = plugin_list; p != NULL; p = p->next){
326
if(p->next == plugin_node){
327
p->next = plugin_node->next;
328
break;
329
}
330
}
331
}
332
333
free(plugin_node);
334
}
335
336
static void free_plugin_list(void){
337
while(plugin_list != NULL){
338
free_plugin(plugin_list);
339
}
340
}
341
188
342
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
343
char *plugindir = NULL;
344
char *argfile = NULL;
345
FILE *conffp;
190
346
size_t d_name_len;
191
347
DIR *dir = NULL;
192
348
struct dirent *dirst;
193
349
struct stat st;
194
350
fd_set rfds_all;
195
351
int ret, maxfd = 0;
352
ssize_t sret;
196
353
uid_t uid = 65534;
197
354
gid_t gid = 65534;
198
355
bool debug = false;
200
357
struct sigaction old_sigchld_action;
201
358
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
359
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
360
char **custom_argv = NULL;
361
int custom_argc = 0;
362
206
363
/* Establish a signal handler */
207
364
sigemptyset(&sigchld_action.sa_mask);
208
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
210
perror("sigaddset");
211
exit(EXIT_FAILURE);
366
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
369
goto fallback;
212
370
}
213
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
215
perror("sigaction");
216
exit(EXIT_FAILURE);
372
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
375
goto fallback;
217
376
}
218
377
219
378
/* The options we understand. */
221
380
{ .name = "global-options", .key = 'g',
222
381
.arg = "OPTION[,OPTION[,...]]",
223
382
.doc = "Options passed to all plugins" },
383
{ .name = "global-env", .key = 'G',
384
.arg = "VAR=value",
385
.doc = "Environment variable passed to all plugins" },
224
386
{ .name = "options-for", .key = 'o',
225
387
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
388
.doc = "Options passed only to specified plugin" },
389
{ .name = "env-for", .key = 'E',
390
.arg = "PLUGIN:ENV=value",
391
.doc = "Environment variable passed to specified plugin" },
227
392
{ .name = "disable", .key = 'd',
228
393
.arg = "PLUGIN",
229
394
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
396
.arg = "PLUGIN",
397
.doc = "Enable a specific plugin", .group = 1 },
230
398
{ .name = "plugin-dir", .key = 128,
231
399
.arg = "DIRECTORY",
232
400
.doc = "Specify a different plugin directory", .group = 2 },
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 },
401
{ .name = "config-file", .key = 129,
402
.arg = "FILE",
403
.doc = "Specify a different configuration file", .group = 2 },
404
{ .name = "userid", .key = 130,
405
.arg = "ID", .flags = 0,
406
.doc = "User ID the plugins will run as", .group = 3 },
407
{ .name = "groupid", .key = 131,
408
.arg = "ID", .flags = 0,
409
.doc = "Group ID the plugins will run as", .group = 3 },
410
{ .name = "debug", .key = 132,
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
241
421
{ .name = NULL }
242
422
};
243
423
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:
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
436
}
437
}
438
}
439
break;
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
442
break;
443
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
462
}
463
}
464
}
465
break;
466
case 'E': /* --env-for */
467
{
468
char *envdef = strchr(arg, ':');
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
break;
473
}
474
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
480
}
481
add_environment(getplugin(arg), envdef, true);
482
}
483
break;
484
case 'd': /* --disable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
489
}
490
}
491
break;
492
case 'e': /* --enable */
493
{
494
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
497
}
498
}
499
break;
500
case 128: /* --plugin-dir */
501
free(plugindir);
502
plugindir = strdup(arg);
503
break;
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
506
break;
507
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
516
break;
517
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
526
break;
527
case 132: /* --debug */
286
528
debug = true;
287
529
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
288
548
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
291
554
}
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]",
555
default:
556
return ARGP_ERR_UNKNOWN;
557
}
558
return errno; /* Set to 0 at start */
559
}
560
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
575
break;
576
case 129: /* --config-file */
577
free(argfile);
578
argfile = strdup(arg);
579
break;
580
case 130: /* --userid */
581
case 131: /* --groupid */
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
case ARGP_KEY_ARG:
587
break;
588
default:
589
return ARGP_ERR_UNKNOWN;
590
}
591
return errno;
592
}
593
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
596
.args_doc = "",
306
597
.doc = "Mandos plugin runner -- Run plugins" };
307
598
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;
350
}
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
615
goto fallback;
616
}
617
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
620
621
/* Open the configfile if available */
622
if(argfile == NULL){
623
conffp = fopen(AFILE, "r");
624
} else {
625
conffp = fopen(argfile, "r");
626
}
627
if(conffp != NULL){
628
char *org_line = NULL;
629
char *p, *arg, *new_arg, *line;
630
size_t size = 0;
631
const char whitespace_delims[] = " \r\t\f\v\n";
632
const char comment_delim[] = "#";
633
634
custom_argc = 1;
635
custom_argv = malloc(sizeof(char*) * 2);
636
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
639
goto fallback;
640
}
641
custom_argv[0] = argv[0];
642
custom_argv[1] = NULL;
643
644
/* for each line in the config file, strip whitespace and ignore
645
commented text */
646
while(true){
647
sret = getline(&org_line, &size, conffp);
648
if(sret == -1){
649
break;
650
}
651
652
line = org_line;
653
arg = strsep(&line, comment_delim);
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
655
if(p[0] == '\0'){
656
continue;
657
}
658
new_arg = strdup(p);
659
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
662
free(org_line);
663
goto fallback;
664
}
665
666
custom_argc += 1;
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
672
free(org_line);
673
goto fallback;
674
}
675
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
677
}
678
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
free(org_line);
688
} else {
689
/* Check for harmful errors and go to fallback. Other errors might
690
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
694
goto fallback;
695
}
696
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
699
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
714
goto fallback;
715
}
716
}
717
718
/* Parse actual command line arguments, to let them override the
719
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
734
goto fallback;
351
735
}
352
736
353
737
if(debug){
357
741
for(char **a = p->argv; *a != NULL; a++){
358
742
fprintf(stderr, "\tArg: %s\n", *a);
359
743
}
360
}
361
}
362
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
745
for(char **a = p->environ; *a != NULL; a++){
746
fprintf(stderr, "\t%s\n", *a);
747
}
748
}
749
}
750
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
363
778
ret = setuid(uid);
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 */
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
381
784
{
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;
389
}
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
390
826
}
391
827
}
392
828
393
829
FD_ZERO(&rfds_all);
394
830
831
/* Read and execute any executable in the plugin directory*/
395
832
while(true){
396
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
397
836
398
// All directory entries have been processed
837
/* All directory entries have been processed */
399
838
if(dirst == NULL){
400
if (errno == EBADF){
401
perror("readdir");
402
exitstatus = EXIT_FAILURE;
403
goto end;
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
842
goto fallback;
404
843
}
405
844
break;
406
845
}
407
846
408
847
d_name_len = strlen(dirst->d_name);
409
848
410
// Ignore dotfiles, backup files and other junk
849
/* Ignore dotfiles, backup files and other junk */
411
850
{
412
851
bool bad_name = false;
413
852
415
854
416
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
856
".dpkg-old",
857
".dpkg-bak",
418
858
".dpkg-divert", NULL };
419
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
860
size_t pre_len = strlen(*pre);
428
868
break;
429
869
}
430
870
}
431
432
871
if(bad_name){
433
872
continue;
434
873
}
435
436
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
875
size_t suf_len = strlen(*suf);
438
876
if((d_name_len >= suf_len)
439
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
440
878
== 0)){
441
879
if(debug){
442
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
452
890
}
453
891
}
454
892
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
893
char *filename;
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
901
}
902
if(ret < 0){
903
error(0, errno, "asprintf");
458
904
continue;
459
905
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
906
464
ret = stat(filename, &st);
465
if (ret == -1){
466
perror("stat");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
467
910
free(filename);
468
911
continue;
469
912
}
470
913
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
914
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
472
917
if(debug){
473
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
474
919
" with bad type or mode\n", filename);
476
921
free(filename);
477
922
continue;
478
923
}
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
924
925
plugin *p = getplugin(dirst->d_name);
926
if(p == NULL){
927
error(0, errno, "getplugin");
928
free(filename);
929
continue;
930
}
931
if(p->disabled){
480
932
if(debug){
481
933
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
934
dirst->d_name);
484
936
free(filename);
485
937
continue;
486
938
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
939
{
489
940
/* Add global arguments to argument list for this plugin */
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
496
ret = pipe(pipefd);
497
if (ret == -1){
498
perror("pipe");
499
exitstatus = EXIT_FAILURE;
500
goto end;
501
}
941
plugin *g = getplugin(NULL);
942
if(g != NULL){
943
for(char **a = g->argv + 1; *a != NULL; a++){
944
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
946
}
947
}
948
/* Add global environment variables */
949
for(char **e = g->environ; *e != NULL; e++){
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
952
}
953
}
954
}
955
}
956
/* If this plugin has any environment variables, we will call
957
using execve and need to duplicate the environment from this
958
process, too. */
959
if(p->environ[0] != NULL){
960
for(char **e = environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
963
}
964
}
965
}
966
967
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
972
goto fallback;
973
}
974
/* Ask OS to automatic close the pipe on exec */
502
975
ret = set_cloexec_flag(pipefd[0]);
503
976
if(ret < 0){
504
perror("set_cloexec_flag");
505
exitstatus = EXIT_FAILURE;
506
goto end;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
979
goto fallback;
507
980
}
508
981
ret = set_cloexec_flag(pipefd[1]);
509
982
if(ret < 0){
510
perror("set_cloexec_flag");
511
exitstatus = EXIT_FAILURE;
512
goto end;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
985
goto fallback;
513
986
}
514
987
/* Block SIGCHLD until process is safely in process list */
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
516
991
if(ret < 0){
517
perror("sigprocmask");
518
exitstatus = EXIT_FAILURE;
519
goto end;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
994
goto fallback;
520
995
}
521
// Starting a new process to be watched
522
pid_t pid = fork();
996
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
523
1001
if(pid == -1){
524
perror("fork");
525
exitstatus = EXIT_FAILURE;
526
goto end;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
1004
goto fallback;
527
1005
}
528
1006
if(pid == 0){
529
1007
/* this is the child process */
530
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
531
1009
if(ret < 0){
532
perror("sigaction");
533
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
534
1012
}
535
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
536
1014
if(ret < 0){
537
perror("sigprocmask");
538
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
539
1017
}
540
1018
541
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
542
1020
if(ret == -1){
543
perror("dup2");
544
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
545
1023
}
546
1024
547
1025
if(dirfd(dir) < 0){
549
1027
above and must now close it manually here. */
550
1028
closedir(dir);
551
1029
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
1030
if(p->environ[0] == NULL){
1031
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
1034
}
1035
} else {
1036
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
1039
}
555
1040
}
556
1041
/* no return */
557
1042
}
558
/* parent process */
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
559
1046
free(filename);
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
564
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
plugin *new_plugin = getplugin(dirst->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
565
1053
if(ret < 0){
566
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
567
1055
}
568
exitstatus = EXIT_FAILURE;
569
goto end;
1056
exitstatus = EX_OSERR;
1057
goto fallback;
570
1058
}
571
1059
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1062
577
1063
/* Unblock SIGCHLD so signal handler can be run if this process
578
1064
has already completed */
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
580
1068
if(ret < 0){
581
perror("sigprocmask");
582
exitstatus = EXIT_FAILURE;
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
599
}
600
601
closedir(dir);
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
1071
goto fallback;
1072
}
1073
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
1076
1077
if(maxfd < new_plugin->fd){
1078
maxfd = new_plugin->fd;
1079
}
1080
}
1081
1082
TEMP_FAILURE_RETRY(closedir(dir));
602
1083
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
1084
free_plugin(getplugin(NULL));
1085
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1087
if(p->pid != 0){
1088
break;
1089
}
1090
if(p->next == NULL){
1091
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1092
" directory?\n");
1093
free_plugin_list();
1094
}
608
1095
}
609
while(process_list){
1096
1097
/* Main loop while running plugins exist */
1098
while(plugin_list){
610
1099
fd_set rfds = rfds_all;
611
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
if (select_ret == -1){
613
perror("select");
614
exitstatus = EXIT_FAILURE;
615
goto end;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
1104
goto fallback;
616
1105
}
617
1106
/* OK, now either a process completed, or something can be read
618
1107
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
1108
for(plugin *proc = plugin_list; proc != NULL;){
620
1109
/* Is this process completely done? */
621
if(proc->eof and proc->completed){
1110
if(proc->completed and proc->eof){
622
1111
/* Only accept the plugin output if it exited cleanly */
623
1112
if(not WIFEXITED(proc->status)
624
1113
or WEXITSTATUS(proc->status) != 0){
625
1114
/* Bad exit by plugin */
1115
626
1116
if(debug){
627
1117
if(WIFEXITED(proc->status)){
628
fprintf(stderr, "Plugin %u exited with status %d\n",
629
(unsigned int) (proc->pid),
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
630
1121
WEXITSTATUS(proc->status));
631
} else if(WIFSIGNALED(proc->status)) {
632
fprintf(stderr, "Plugin %u killed by signal %d\n",
633
(unsigned int) (proc->pid),
634
WTERMSIG(proc->status));
1122
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
635
1128
} else if(WCOREDUMP(proc->status)){
636
fprintf(stderr, "Plugin %d dumped core\n",
637
(unsigned int) (proc->pid));
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
638
1131
}
639
1132
}
1133
640
1134
/* Remove the plugin */
641
FD_CLR(proc->fd, &rfds_all);
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
642
1138
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
644
1143
if(ret < 0){
645
perror("sigprocmask");
646
exitstatus = EXIT_FAILURE;
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
1146
goto fallback;
1147
}
1148
1149
plugin *next_plugin = proc->next;
1150
free_plugin(proc);
1151
proc = next_plugin;
1152
662
1153
/* We are done modifying process list, so unblock signal */
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
665
1157
if(ret < 0){
666
perror("sigprocmask");
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1160
goto fallback;
1161
}
1162
1163
if(plugin_list == NULL){
1164
break;
1165
}
1166
1167
continue;
674
1168
}
1169
675
1170
/* This process exited nicely, so print its buffer */
676
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1171
1172
bool bret = print_out_password(proc->buffer,
1173
proc->buffer_length);
678
1174
if(not bret){
679
perror("print_out_password");
680
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
681
1177
}
682
goto end;
1178
goto fallback;
683
1179
}
1180
684
1181
/* This process has not completed. Does it have any output? */
685
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
686
1185
/* This process had nothing to say at this time */
1186
proc = proc->next;
687
1187
continue;
688
1188
}
689
1189
/* Before reading, make the process' data buffer large enough */
690
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
691
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
692
1192
+ (size_t) BUFFER_SIZE);
693
if (proc->buffer == NULL){
694
perror("malloc");
695
exitstatus = EXIT_FAILURE;
696
goto end;
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1196
goto fallback;
697
1197
}
698
1198
proc->buffer_size += BUFFER_SIZE;
699
1199
}
700
1200
/* Read from the process */
701
ret = read(proc->fd, proc->buffer + proc->buffer_length,
702
BUFFER_SIZE);
703
if(ret < 0){
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
704
1206
/* Read error from this process; ignore the error */
1207
proc = proc->next;
705
1208
continue;
706
1209
}
707
if(ret == 0){
1210
if(sret == 0){
708
1211
/* got EOF */
709
1212
proc->eof = true;
710
1213
} else {
711
proc->buffer_length += (size_t) ret;
1214
proc->buffer_length += (size_t) sret;
712
1215
}
713
1216
}
714
1217
}
715
716
717
end:
718
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
1218
1219
1220
fallback:
1221
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1224
/* Fallback if all plugins failed, none are found or an error
1225
occured */
721
1226
bool bret;
722
1227
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
1228
char *passwordbuffer = getpass("Password: ");
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1229
size_t len = strlen(passwordbuffer);
1230
/* Strip trailing newline */
1231
if(len > 0 and passwordbuffer[len-1] == '\n'){
1232
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1233
len--;
1234
}
1235
bret = print_out_password(passwordbuffer, len);
725
1236
if(not bret){
726
perror("print_out_password");
727
exitstatus = EXIT_FAILURE;
728
goto end;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
729
1239
}
730
1240
}
731
1241
732
1242
/* Restore old signal handler */
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1247
}
1248
1249
if(custom_argv != NULL){
1250
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1251
free(*arg);
1252
}
1253
free(custom_argv);
742
1254
}
743
1255
744
1256
if(dir != NULL){
745
1257
closedir(dir);
746
1258
}
747
1259
748
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1260
/* Kill the processes */
1261
for(plugin *p = plugin_list; p != NULL; p = p->next){
1262
if(p->pid != 0){
1263
close(p->fd);
1264
ret = kill(p->pid, SIGTERM);
1265
if(ret == -1 and errno != ESRCH){
1266
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1268
}
756
1269
}
757
free(process_list->buffer);
758
free(process_list);
759
1270
}
760
1271
761
1272
/* Wait for any remaining child processes to terminate */
762
do{
1273
do {
763
1274
ret = wait(NULL);
764
1275
} while(ret >= 0);
765
1276
if(errno != ECHILD){
766
perror("wait");
1277
error(0, errno, "wait");
767
1278
}
768
1279
1280
free_plugin_list();
1281
1282
free(plugindir);
1283
free(argfile);
1284
769
1285
return exitstatus;
770
1286
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0