To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugbasedclient.c
- browse files at revision 41
- compare with another revision
- download diff
- download tarball
- view history from revision 41
- Committer: Teddy Hogeborn
- Date: 2008-08-03 21:45:14 UTC
- mfrom: (24.1.13 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080803214514-plvvkrpoitwsrxeg
Merge.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
38
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
58
48
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
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() */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
75
52
76
53
#define BUFFER_SIZE 256
77
54
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*/
55
struct process;
56
57
typedef struct process{
93
58
pid_t pid;
94
59
int fd;
95
60
char *buffer;
96
61
size_t buffer_size;
97
62
size_t buffer_length;
98
63
bool eof;
99
volatile sig_atomic_t completed;
64
bool completed;
100
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
101
74
struct plugin *next;
102
75
} plugin;
103
76
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
__attribute__((warn_unused_result))
109
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
79
if ((p->name == name)
80
or (p->name and name and (strcmp(p->name, name) == 0))){
114
81
return p;
115
82
}
116
83
}
117
84
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
123
return NULL;
124
}
125
char *copy_name = NULL;
126
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
return NULL;
135
}
136
}
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
148
free(copy_name);
149
free(new_plugin);
150
errno = e;
151
return NULL;
152
}
153
new_plugin->argv[0] = copy_name;
85
plugin *new_plugin = malloc(sizeof(plugin));
86
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
91
new_plugin->argv = malloc(sizeof(char *) * 2);
92
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
95
}
96
new_plugin->argv[0] = name;
154
97
new_plugin->argv[1] = NULL;
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
159
if(new_plugin->environ == NULL){
160
int e = errno;
161
free(copy_name);
162
free(new_plugin->argv);
163
free(new_plugin);
164
errno = e;
165
return NULL;
166
}
167
new_plugin->environ[0] = NULL;
168
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
169
101
/* Append the new plugin to the list */
170
plugin_list = new_plugin;
102
*plugin_list = new_plugin;
171
103
return new_plugin;
172
104
}
173
105
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
static bool add_to_char_array(const char *new, char ***array,
177
int *len){
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
184
/* Malloc check */
185
if(new_array == NULL){
186
return false;
187
}
188
*array = new_array;
189
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
194
if(copy == NULL){
195
return false;
196
}
197
/* Insert the copy */
198
(*array)[*len] = copy;
199
(*len)++;
200
/* Add a new terminating NULL pointer to the last element */
201
(*array)[*len] = NULL;
202
return true;
203
}
204
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
static bool add_argument(plugin *p, const char *arg){
208
if(p == NULL){
209
return false;
210
}
211
return add_to_char_array(arg, &(p->argv), &(p->argc));
212
}
213
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
217
if(p == NULL){
218
return false;
219
}
220
/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
226
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
232
return false;
233
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
236
}
237
return true;
238
}
239
}
240
return add_to_char_array(def, &(p->environ), &(p->envc));
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
241
115
}
242
116
243
117
/*
244
118
* Based on the example in the GNU LibC manual chapter 13.13 "File
245
119
* Descriptor Flags".
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
120
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
121
*/
248
__attribute__((warn_unused_result))
249
static int set_cloexec_flag(int fd){
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
122
static int set_cloexec_flag(int fd)
123
{
124
int ret = fcntl(fd, F_GETFD, 0);
251
125
/* If reading the flags failed, return error indication now. */
252
126
if(ret < 0){
253
127
return ret;
254
128
}
255
129
/* Store modified flag word in the descriptor. */
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
131
}
259
132
260
261
/* Mark processes as completed when they exit, and save their exit
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
262
139
status. */
263
static void handle_sigchld(__attribute__((unused)) int sig){
264
int old_errno = errno;
265
while(true){
266
plugin *proc = plugin_list;
267
int status;
268
pid_t pid = waitpid(-1, &status, WNOHANG);
269
if(pid == 0){
270
/* Only still running child processes */
271
break;
272
}
273
if(pid == -1){
274
if(errno == ECHILD){
275
/* No child processes */
276
break;
277
}
278
error(0, errno, "waitpid");
279
}
280
281
/* A child exited, find it in process_list */
282
while(proc != NULL and proc->pid != pid){
283
proc = proc->next;
284
}
285
if(proc == NULL){
286
/* Process not found in process list */
287
continue;
288
}
289
proc->status = status;
290
proc->completed = 1;
291
}
292
errno = old_errno;
293
}
294
295
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
static bool print_out_password(const char *buffer, size_t length){
298
ssize_t ret;
299
for(size_t written = 0; written < length; written += (size_t)ret){
300
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
301
length - written));
302
if(ret < 0){
303
return false;
304
}
305
}
306
return true;
307
}
308
309
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
static void free_plugin(plugin *plugin_node){
312
313
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
314
free(*arg);
315
}
316
free(plugin_node->argv);
317
for(char **env = plugin_node->environ; *env != NULL; env++){
318
free(*env);
319
}
320
free(plugin_node->environ);
321
free(plugin_node->buffer);
322
323
/* Removes the plugin from the singly-linked list */
324
if(plugin_node == plugin_list){
325
/* First one - simple */
326
plugin_list = plugin_list->next;
327
} else {
328
/* Second one or later */
329
for(plugin *p = plugin_list; p != NULL; p = p->next){
330
if(p->next == plugin_node){
331
p->next = plugin_node->next;
332
break;
333
}
334
}
335
}
336
337
free(plugin_node);
338
}
339
340
static void free_plugin_list(void){
341
while(plugin_list != NULL){
342
free_plugin(plugin_list);
343
}
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
344
153
}
345
154
346
155
int main(int argc, char *argv[]){
347
char *plugindir = NULL;
348
char *argfile = NULL;
349
FILE *conffp;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
350
157
size_t d_name_len;
351
158
DIR *dir = NULL;
352
159
struct dirent *dirst;
353
160
struct stat st;
354
161
fd_set rfds_all;
355
162
int ret, maxfd = 0;
356
ssize_t sret;
357
163
uid_t uid = 65534;
358
164
gid_t gid = 65534;
359
165
bool debug = false;
361
167
struct sigaction old_sigchld_action;
362
168
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
363
169
.sa_flags = SA_NOCLDSTOP };
364
char **custom_argv = NULL;
365
int custom_argc = 0;
366
int dir_fd;
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
367
172
368
173
/* Establish a signal handler */
369
174
sigemptyset(&sigchld_action.sa_mask);
370
175
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
374
goto fallback;
176
if(ret < 0){
177
perror("sigaddset");
178
exit(EXIT_FAILURE);
375
179
}
376
180
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
380
goto fallback;
181
if(ret < 0){
182
perror("sigaction");
183
exit(EXIT_FAILURE);
381
184
}
382
185
383
186
/* The options we understand. */
385
188
{ .name = "global-options", .key = 'g',
386
189
.arg = "OPTION[,OPTION[,...]]",
387
190
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
389
.arg = "VAR=value",
390
.doc = "Environment variable passed to all plugins" },
391
191
{ .name = "options-for", .key = 'o',
392
192
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
393
193
.doc = "Options passed only to specified plugin" },
394
{ .name = "env-for", .key = 'E',
395
.arg = "PLUGIN:ENV=value",
396
.doc = "Environment variable passed to specified plugin" },
397
194
{ .name = "disable", .key = 'd',
398
195
.arg = "PLUGIN",
399
196
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
403
197
{ .name = "plugin-dir", .key = 128,
404
198
.arg = "DIRECTORY",
405
199
.doc = "Specify a different plugin directory", .group = 2 },
406
{ .name = "config-file", .key = 129,
407
.arg = "FILE",
408
.doc = "Specify a different configuration file", .group = 2 },
409
{ .name = "userid", .key = 130,
410
.arg = "ID", .flags = 0,
411
.doc = "User ID the plugins will run as", .group = 3 },
412
{ .name = "groupid", .key = 131,
413
.arg = "ID", .flags = 0,
414
.doc = "Group ID the plugins will run as", .group = 3 },
415
{ .name = "debug", .key = 132,
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
426
208
{ .name = NULL }
427
209
};
428
210
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
435
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
450
break;
451
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
473
}
474
break;
475
case 'E': /* --env-for */
476
{
477
char *envdef = strchr(arg, ':');
478
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
484
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
493
}
494
break;
495
case 'd': /* --disable */
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
511
}
512
break;
513
case 128: /* --plugin-dir */
514
free(plugindir);
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
break;
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
522
break;
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
break;
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
break;
545
case 132: /* --debug */
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
247
uid = (uid_t)strtol(arg, NULL, 10);
248
break;
249
case 130:
250
gid = (gid_t)strtol(arg, NULL, 10);
251
break;
252
case 131:
546
253
debug = true;
547
254
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
573
default:
574
return ARGP_ERR_UNKNOWN;
575
}
576
return errno; /* Set to 0 at start */
577
}
578
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
593
break;
594
case 129: /* --config-file */
595
free(argfile);
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
break;
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
case ARGP_KEY_ARG:
608
break;
609
default:
610
return ARGP_ERR_UNKNOWN;
611
}
612
return errno;
613
}
614
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
617
.args_doc = "",
255
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
258
}
259
plus_options = arg;
260
break;
261
case ARGP_KEY_END:
262
break;
263
default:
264
return ARGP_ERR_UNKNOWN;
265
}
266
return 0;
267
}
268
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
618
273
.doc = "Mandos plugin runner -- Run plugins" };
619
274
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
636
goto fallback;
637
}
638
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
641
642
/* Open the configfile if available */
643
if(argfile == NULL){
644
conffp = fopen(AFILE, "r");
645
} else {
646
conffp = fopen(argfile, "r");
647
}
648
if(conffp != NULL){
649
char *org_line = NULL;
650
char *p, *arg, *new_arg, *line;
651
size_t size = 0;
652
const char whitespace_delims[] = " \r\t\f\v\n";
653
const char comment_delim[] = "#";
654
655
custom_argc = 1;
656
custom_argv = malloc(sizeof(char*) * 2);
657
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
660
goto fallback;
661
}
662
custom_argv[0] = argv[0];
663
custom_argv[1] = NULL;
664
665
/* for each line in the config file, strip whitespace and ignore
666
commented text */
667
while(true){
668
sret = getline(&org_line, &size, conffp);
669
if(sret == -1){
670
break;
671
}
672
673
line = org_line;
674
arg = strsep(&line, comment_delim);
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
676
if(p[0] == '\0'){
677
continue;
678
}
679
new_arg = strdup(p);
680
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
683
free(org_line);
684
goto fallback;
685
}
686
687
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
701
}
702
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
704
}
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
714
free(org_line);
715
} else {
716
/* Check for harmful errors and go to fallback. Other errors might
717
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
721
goto fallback;
722
}
723
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
726
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
741
goto fallback;
742
}
743
}
744
745
/* Parse actual command line arguments, to let them override the
746
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
761
goto fallback;
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
287
perror("malloc");
288
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
762
308
}
763
309
764
310
if(debug){
768
314
for(char **a = p->argv; *a != NULL; a++){
769
315
fprintf(stderr, "\tArg: %s\n", *a);
770
316
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
772
for(char **a = p->environ; *a != NULL; a++){
773
fprintf(stderr, "\t%s\n", *a);
774
}
775
}
776
}
777
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
317
}
318
}
319
807
320
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
321
if (ret == -1){
322
perror("setuid");
323
}
324
325
setgid(gid);
326
if (ret == -1){
327
perror("setgid");
328
}
329
330
dir = opendir(plugindir);
331
if(dir == NULL){
332
perror("Could not open plugin dir");
333
exitstatus = EXIT_FAILURE;
334
goto end;
335
}
336
337
/* Set the FD_CLOEXEC flag on the directory, if possible */
813
338
{
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
339
int dir_fd = dirfd(dir);
340
if(dir_fd >= 0){
341
ret = set_cloexec_flag(dir_fd);
342
if(ret < 0){
343
perror("set_cloexec_flag");
344
exitstatus = EXIT_FAILURE;
345
goto end;
346
}
844
347
}
845
348
}
846
349
847
350
FD_ZERO(&rfds_all);
848
351
849
/* Read and execute any executable in the plugin directory*/
850
352
while(true){
851
do {
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
353
dirst = readdir(dir);
854
354
855
/* All directory entries have been processed */
355
// All directory entries have been processed
856
356
if(dirst == NULL){
857
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
860
goto fallback;
861
}
862
357
break;
863
358
}
864
359
865
360
d_name_len = strlen(dirst->d_name);
866
361
867
/* Ignore dotfiles, backup files and other junk */
362
// Ignore dotfiles, backup files and other junk
868
363
{
869
364
bool bad_name = false;
870
365
871
const char * const bad_prefixes[] = { ".", "#", NULL };
366
const char const *bad_prefixes[] = { ".", "#", NULL };
872
367
873
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
368
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
874
369
".dpkg-old",
875
".dpkg-bak",
876
370
".dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pre = (const char **)bad_prefixes;
882
*pre != NULL; pre++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
371
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
886
372
size_t pre_len = strlen(*pre);
887
373
if((d_name_len >= pre_len)
888
374
and strncmp((dirst->d_name), *pre, pre_len) == 0){
894
380
break;
895
381
}
896
382
}
383
897
384
if(bad_name){
898
385
continue;
899
386
}
900
#ifdef __GNUC__
901
#pragma GCC diagnostic push
902
#pragma GCC diagnostic ignored "-Wcast-qual"
903
#endif
904
for(const char **suf = (const char **)bad_suffixes;
905
*suf != NULL; suf++){
906
#ifdef __GNUC__
907
#pragma GCC diagnostic pop
908
#endif
387
388
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
909
389
size_t suf_len = strlen(*suf);
910
390
if((d_name_len >= suf_len)
911
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
391
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
912
392
== 0)){
913
393
if(debug){
914
394
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
924
404
}
925
405
}
926
406
927
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
928
#ifdef O_CLOEXEC
929
O_CLOEXEC
930
#else /* not O_CLOEXEC */
931
0
932
#endif /* not O_CLOEXEC */
933
);
934
if(plugin_fd == -1){
935
error(0, errno, "Could not open plugin");
936
continue;
937
}
938
#ifndef O_CLOEXEC
939
/* Set the FD_CLOEXEC flag on the plugin FD */
940
ret = set_cloexec_flag(plugin_fd);
941
if(ret < 0){
942
error(0, errno, "set_cloexec_flag");
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
continue;
945
}
946
#endif /* O_CLOEXEC */
947
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
948
if(ret == -1){
949
error(0, errno, "stat");
950
TEMP_FAILURE_RETRY(close(plugin_fd));
951
continue;
952
}
953
954
/* Ignore non-executable files */
955
if(not S_ISREG(st.st_mode)
956
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
957
0)) != 0)){
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
958
420
if(debug){
959
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
960
" with bad type or mode\n",
961
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
422
" with bad type or mode\n", filename);
962
423
}
963
TEMP_FAILURE_RETRY(close(plugin_fd));
964
continue;
965
}
966
967
plugin *p = getplugin(dirst->d_name);
968
if(p == NULL){
969
error(0, errno, "getplugin");
970
TEMP_FAILURE_RETRY(close(plugin_fd));
971
continue;
972
}
973
if(p->disabled){
424
free(filename);
425
continue;
426
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
974
428
if(debug){
975
429
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
976
430
dirst->d_name);
977
431
}
978
TEMP_FAILURE_RETRY(close(plugin_fd));
432
free(filename);
979
433
continue;
980
434
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
981
436
{
982
437
/* Add global arguments to argument list for this plugin */
983
plugin *g = getplugin(NULL);
984
if(g != NULL){
985
for(char **a = g->argv + 1; *a != NULL; a++){
986
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
988
}
989
}
990
/* Add global environment variables */
991
for(char **e = g->environ; *e != NULL; e++){
992
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
994
}
995
}
996
}
997
}
998
/* If this plugin has any environment variables, we need to
999
duplicate the environment from this process, too. */
1000
if(p->environ[0] != NULL){
1001
for(char **e = environ; *e != NULL; e++){
1002
if(not add_environment(p, *e, false)){
1003
error(0, errno, "add_environment");
1004
}
1005
}
1006
}
1007
1008
int pipefd[2];
1009
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1010
if(ret == -1){
1011
error(0, errno, "pipe");
1012
exitstatus = EX_OSERR;
1013
goto fallback;
1014
}
1015
/* Ask OS to automatic close the pipe on exec */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
444
ret = pipe(pipefd);
445
if (ret == -1){
446
perror("pipe");
447
exitstatus = EXIT_FAILURE;
448
goto end;
449
}
1016
450
ret = set_cloexec_flag(pipefd[0]);
1017
451
if(ret < 0){
1018
error(0, errno, "set_cloexec_flag");
1019
exitstatus = EX_OSERR;
1020
goto fallback;
452
perror("set_cloexec_flag");
453
exitstatus = EXIT_FAILURE;
454
goto end;
1021
455
}
1022
456
ret = set_cloexec_flag(pipefd[1]);
1023
457
if(ret < 0){
1024
error(0, errno, "set_cloexec_flag");
1025
exitstatus = EX_OSERR;
1026
goto fallback;
458
perror("set_cloexec_flag");
459
exitstatus = EXIT_FAILURE;
460
goto end;
1027
461
}
1028
462
/* Block SIGCHLD until process is safely in process list */
1029
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1030
&sigchld_action.sa_mask,
1031
NULL));
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1032
464
if(ret < 0){
1033
error(0, errno, "sigprocmask");
1034
exitstatus = EX_OSERR;
1035
goto fallback;
1036
}
1037
/* Starting a new process to be watched */
1038
pid_t pid;
1039
do {
1040
pid = fork();
1041
} while(pid == -1 and errno == EINTR);
1042
if(pid == -1){
1043
error(0, errno, "fork");
1044
exitstatus = EX_OSERR;
1045
goto fallback;
1046
}
465
perror("sigprocmask");
466
exitstatus = EXIT_FAILURE;
467
goto end;
468
}
469
// Starting a new process to be watched
470
pid_t pid = fork();
1047
471
if(pid == 0){
1048
472
/* this is the child process */
1049
473
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1050
474
if(ret < 0){
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
475
perror("sigaction");
476
_exit(EXIT_FAILURE);
1053
477
}
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
479
if(ret < 0){
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
1058
}
1059
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1061
if(ret == -1){
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
1064
}
480
perror("sigprocmask");
481
_exit(EXIT_FAILURE);
482
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1065
484
1066
485
if(dirfd(dir) < 0){
1067
486
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1068
487
above and must now close it manually here. */
1069
488
closedir(dir);
1070
489
}
1071
if(fexecve(plugin_fd, p->argv,
1072
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1073
error(0, errno, "fexecve for %s/%s",
1074
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1075
_exit(EX_OSERR);
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
1076
493
}
1077
494
/* no return */
1078
495
}
1079
/* Parent process */
1080
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1081
pipe */
1082
TEMP_FAILURE_RETRY(close(plugin_fd));
1083
plugin *new_plugin = getplugin(dirst->d_name);
1084
if(new_plugin == NULL){
1085
error(0, errno, "getplugin");
1086
ret = (int)(TEMP_FAILURE_RETRY
1087
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1088
NULL)));
496
/* parent process */
497
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1089
503
if(ret < 0){
1090
error(0, errno, "sigprocmask");
504
perror("sigprocmask");
1091
505
}
1092
exitstatus = EX_OSERR;
1093
goto fallback;
506
exitstatus = EXIT_FAILURE;
507
goto end;
1094
508
}
1095
509
1096
new_plugin->pid = pid;
1097
new_plugin->fd = pipefd[0];
1098
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
1099
515
/* Unblock SIGCHLD so signal handler can be run if this process
1100
516
has already completed */
1101
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1102
&sigchld_action.sa_mask,
1103
NULL));
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1104
518
if(ret < 0){
1105
error(0, errno, "sigprocmask");
1106
exitstatus = EX_OSERR;
1107
goto fallback;
1108
}
1109
1110
#if defined (__GNUC__) and defined (__GLIBC__)
1111
#if not __GLIBC_PREREQ(2, 16)
1112
#pragma GCC diagnostic push
1113
#pragma GCC diagnostic ignored "-Wsign-conversion"
1114
#endif
1115
#endif
1116
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1117
-Wconversion in GNU libc
1118
before 2.16 */
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic pop
1122
#endif
1123
#endif
1124
1125
if(maxfd < new_plugin->fd){
1126
maxfd = new_plugin->fd;
1127
}
1128
}
1129
1130
TEMP_FAILURE_RETRY(closedir(dir));
519
perror("sigprocmask");
520
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
537
}
538
539
closedir(dir);
1131
540
dir = NULL;
1132
free_plugin(getplugin(NULL));
1133
541
1134
for(plugin *p = plugin_list; p != NULL; p = p->next){
1135
if(p->pid != 0){
1136
break;
1137
}
1138
if(p->next == NULL){
1139
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1140
" directory?\n");
1141
free_plugin_list();
1142
}
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
1143
546
}
1144
1145
/* Main loop while running plugins exist */
1146
while(plugin_list){
547
while(process_list){
1147
548
fd_set rfds = rfds_all;
1148
549
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1149
if(select_ret == -1 and errno != EINTR){
1150
error(0, errno, "select");
1151
exitstatus = EX_OSERR;
1152
goto fallback;
550
if (select_ret == -1){
551
perror("select");
552
exitstatus = EXIT_FAILURE;
553
goto end;
1153
554
}
1154
555
/* OK, now either a process completed, or something can be read
1155
556
from one of them */
1156
for(plugin *proc = plugin_list; proc != NULL;){
557
for(process *proc = process_list; proc ; proc = proc->next){
1157
558
/* Is this process completely done? */
1158
if(proc->completed and proc->eof){
559
if(proc->eof and proc->completed){
1159
560
/* Only accept the plugin output if it exited cleanly */
1160
561
if(not WIFEXITED(proc->status)
1161
562
or WEXITSTATUS(proc->status) != 0){
1162
563
/* Bad exit by plugin */
1163
1164
564
if(debug){
1165
565
if(WIFEXITED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1167
" status %d\n", proc->name,
1168
(intmax_t) (proc->pid),
1169
WEXITSTATUS(proc->status));
1170
} else if(WIFSIGNALED(proc->status)){
1171
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1172
" signal %d: %s\n", proc->name,
1173
(intmax_t) (proc->pid),
1174
WTERMSIG(proc->status),
1175
strsignal(WTERMSIG(proc->status)));
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
1176
571
} else if(WCOREDUMP(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1178
" core\n", proc->name, (intmax_t) (proc->pid));
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1179
573
}
1180
574
}
1181
1182
575
/* Remove the plugin */
1183
#if defined (__GNUC__) and defined (__GLIBC__)
1184
#if not __GLIBC_PREREQ(2, 16)
1185
#pragma GCC diagnostic push
1186
#pragma GCC diagnostic ignored "-Wsign-conversion"
1187
#endif
1188
#endif
1189
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1190
-Wconversion in GNU libc
1191
before 2.16 */
1192
#if defined (__GNUC__) and defined (__GLIBC__)
1193
#if not __GLIBC_PREREQ(2, 16)
1194
#pragma GCC diagnostic pop
1195
#endif
1196
#endif
1197
576
FD_CLR(proc->fd, &rfds_all);
1198
577
/* Block signal while modifying process_list */
1199
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1200
(SIG_BLOCK,
1201
&sigchld_action.sa_mask,
1202
NULL));
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1203
579
if(ret < 0){
1204
error(0, errno, "sigprocmask");
1205
exitstatus = EX_OSERR;
1206
goto fallback;
1207
}
1208
1209
plugin *next_plugin = proc->next;
1210
free_plugin(proc);
1211
proc = next_plugin;
1212
580
perror("sigprocmask");
581
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
1213
597
/* We are done modifying process list, so unblock signal */
1214
ret = (int)(TEMP_FAILURE_RETRY
1215
(sigprocmask(SIG_UNBLOCK,
1216
&sigchld_action.sa_mask, NULL)));
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
NULL);
1217
600
if(ret < 0){
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
1220
goto fallback;
1221
}
1222
1223
if(plugin_list == NULL){
1224
break;
1225
}
1226
1227
continue;
601
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
1228
609
}
1229
1230
610
/* This process exited nicely, so print its buffer */
1231
1232
bool bret = print_out_password(proc->buffer,
1233
proc->buffer_length);
1234
if(not bret){
1235
error(0, errno, "print_out_password");
1236
exitstatus = EX_IOERR;
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
1237
622
}
1238
goto fallback;
623
goto end;
1239
624
}
1240
1241
625
/* This process has not completed. Does it have any output? */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic push
1245
#pragma GCC diagnostic ignored "-Wsign-conversion"
1246
#endif
1247
#endif
1248
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1249
warning from
1250
-Wconversion
1251
in GNU libc
1252
before
1253
2.16 */
1254
#if defined (__GNUC__) and defined (__GLIBC__)
1255
#if not __GLIBC_PREREQ(2, 16)
1256
#pragma GCC diagnostic pop
1257
#endif
1258
#endif
626
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1259
627
/* This process had nothing to say at this time */
1260
proc = proc->next;
1261
628
continue;
1262
629
}
1263
630
/* Before reading, make the process' data buffer large enough */
1264
631
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1265
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1266
+ (size_t) BUFFER_SIZE);
1267
if(new_buffer == NULL){
1268
error(0, errno, "malloc");
1269
exitstatus = EX_OSERR;
1270
goto fallback;
632
proc->buffer = realloc(proc->buffer, proc->buffer_size
633
+ (size_t) BUFFER_SIZE);
634
if (proc->buffer == NULL){
635
perror("malloc");
636
exitstatus = EXIT_FAILURE;
637
goto end;
1271
638
}
1272
proc->buffer = new_buffer;
1273
639
proc->buffer_size += BUFFER_SIZE;
1274
640
}
1275
641
/* Read from the process */
1276
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1277
proc->buffer
1278
+ proc->buffer_length,
1279
BUFFER_SIZE));
1280
if(sret < 0){
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
643
BUFFER_SIZE);
644
if(ret < 0){
1281
645
/* Read error from this process; ignore the error */
1282
proc = proc->next;
1283
646
continue;
1284
647
}
1285
if(sret == 0){
648
if(ret == 0){
1286
649
/* got EOF */
1287
650
proc->eof = true;
1288
651
} else {
1289
proc->buffer_length += (size_t) sret;
652
proc->buffer_length += (size_t) ret;
1290
653
}
1291
654
}
1292
655
}
1293
1294
1295
fallback:
1296
1297
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1298
and exitstatus != EX_OK)){
1299
/* Fallback if all plugins failed, none are found or an error
1300
occured */
1301
bool bret;
1302
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1303
char *passwordbuffer = getpass("Password: ");
1304
size_t len = strlen(passwordbuffer);
1305
/* Strip trailing newline */
1306
if(len > 0 and passwordbuffer[len-1] == '\n'){
1307
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1308
len--;
1309
}
1310
bret = print_out_password(passwordbuffer, len);
1311
if(not bret){
1312
error(0, errno, "print_out_password");
1313
exitstatus = EX_IOERR;
1314
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1315
659
}
1316
660
661
end:
1317
662
/* Restore old signal handler */
1318
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1319
if(ret == -1){
1320
error(0, errno, "sigaction");
1321
exitstatus = EX_OSERR;
1322
}
1323
1324
if(custom_argv != NULL){
1325
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1326
free(*arg);
1327
}
1328
free(custom_argv);
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1329
672
}
1330
673
1331
674
if(dir != NULL){
1332
675
closedir(dir);
1333
676
}
1334
677
1335
/* Kill the processes */
1336
for(plugin *p = plugin_list; p != NULL; p = p->next){
1337
if(p->pid != 0){
1338
close(p->fd);
1339
ret = kill(p->pid, SIGTERM);
1340
if(ret == -1 and errno != ESRCH){
1341
/* Set-uid proccesses might not get closed */
1342
error(0, errno, "kill");
1343
}
1344
}
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1345
685
}
1346
686
1347
687
/* Wait for any remaining child processes to terminate */
1348
do {
688
do{
1349
689
ret = wait(NULL);
1350
690
} while(ret >= 0);
1351
691
if(errno != ECHILD){
1352
error(0, errno, "wait");
692
perror("wait");
1353
693
}
1354
694
1355
free_plugin_list();
1356
1357
free(plugindir);
1358
free(argfile);
1359
1360
695
return exitstatus;
1361
696
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0