To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.65
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.65
- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
61
58
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
60
#include <signal.h> /* struct sigaction, sigemptyset(),
65
61
sigaddset(), sigaction(),
66
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
63
SIG_UNBLOCK, kill() */
69
64
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
65
72
66
#define BUFFER_SIZE 256
73
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
78
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
80
86
typedef struct plugin{
81
87
char *name; /* can be NULL or any plugin name */
82
88
char **argv;
84
90
char **environ;
85
91
int envc;
86
92
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
97
93
struct plugin *next;
98
94
} plugin;
99
95
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
109
100
return p;
110
101
}
111
102
}
112
103
/* Create a new plugin */
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
118
106
return NULL;
119
107
}
120
108
char *copy_name = NULL;
121
109
if(name != NULL){
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
110
copy_name = strdup(name);
125
111
if(copy_name == NULL){
126
free(new_plugin);
127
112
return NULL;
128
113
}
129
114
}
130
115
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
135
121
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
140
124
free(copy_name);
141
125
free(new_plugin);
142
126
return NULL;
143
127
}
144
128
new_plugin->argv[0] = copy_name;
145
129
new_plugin->argv[1] = NULL;
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
130
131
new_plugin->environ = malloc(sizeof(char *));
150
132
if(new_plugin->environ == NULL){
151
133
free(copy_name);
152
134
free(new_plugin->argv);
154
136
return NULL;
155
137
}
156
138
new_plugin->environ[0] = NULL;
157
158
139
/* Append the new plugin to the list */
159
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
160
141
return new_plugin;
161
142
}
162
143
164
145
static bool add_to_char_array(const char *new, char ***array,
165
146
int *len){
166
147
/* Resize the pointed-to array to hold one more pointer */
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
171
150
/* Malloc check */
172
151
if(*array == NULL){
173
152
return false;
174
153
}
175
154
/* Make a copy of the new string */
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
155
char *copy = strdup(new);
180
156
if(copy == NULL){
181
157
return false;
182
158
}
197
173
}
198
174
199
175
/* Add to a plugin's environment */
200
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
201
177
if(p == NULL){
202
178
return false;
203
179
}
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
210
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
216
return false;
217
}
218
*e = new;
219
strcpy(*e, def);
220
}
221
return true;
222
}
223
}
224
180
return add_to_char_array(def, &(p->environ), &(p->envc));
225
181
}
226
182
183
227
184
/*
228
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
186
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
231
188
*/
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
234
192
/* If reading the flags failed, return error indication now. */
235
193
if(ret < 0){
236
194
return ret;
237
195
}
238
196
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
241
198
}
242
199
200
process *process_list = NULL;
243
201
244
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
245
203
status. */
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
248
206
while(true){
249
plugin *proc = plugin_list;
250
207
int status;
251
208
pid_t pid = waitpid(-1, &status, WNOHANG);
252
209
if(pid == 0){
253
/* Only still running child processes */
254
210
break;
255
211
}
256
212
if(pid == -1){
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
213
if (errno != ECHILD){
214
perror("waitpid");
260
215
}
261
perror("waitpid");
216
return;
262
217
}
263
264
/* A child exited, find it in process_list */
218
265
219
while(proc != NULL and proc->pid != pid){
266
220
proc = proc->next;
267
221
}
270
224
continue;
271
225
}
272
226
proc->status = status;
273
proc->completed = 1;
227
proc->completed = true;
274
228
}
275
errno = old_errno;
276
229
}
277
230
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
231
bool print_out_password(const char *buffer, size_t length){
280
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
281
236
for(size_t written = 0; written < length; written += (size_t)ret){
282
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
283
238
length - written));
288
243
return true;
289
244
}
290
245
291
/* Removes and free a plugin from the plugin list */
292
static void free_plugin(plugin *plugin_node){
293
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
295
free(*arg);
296
}
297
free(plugin_node->argv);
298
for(char **env = plugin_node->environ; *env != NULL; env++){
299
free(*env);
300
}
301
free(plugin_node->environ);
302
free(plugin_node->buffer);
303
304
/* Removes the plugin from the singly-linked list */
305
if(plugin_node == plugin_list){
306
/* First one - simple */
307
plugin_list = plugin_list->next;
308
} else {
309
/* Second one or later */
310
for(plugin *p = plugin_list; p != NULL; p = p->next){
311
if(p->next == plugin_node){
312
p->next = plugin_node->next;
313
break;
314
}
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
315
252
}
316
}
317
318
free(plugin_node);
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
319
265
}
320
266
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
324
279
}
325
280
}
326
281
327
282
int main(int argc, char *argv[]){
328
char *plugindir = NULL;
329
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
330
285
FILE *conffp;
331
286
size_t d_name_len;
332
287
DIR *dir = NULL;
334
289
struct stat st;
335
290
fd_set rfds_all;
336
291
int ret, maxfd = 0;
337
ssize_t sret;
338
292
uid_t uid = 65534;
339
293
gid_t gid = 65534;
340
294
bool debug = false;
365
319
{ .name = "global-options", .key = 'g',
366
320
.arg = "OPTION[,OPTION[,...]]",
367
321
.doc = "Options passed to all plugins" },
368
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
369
323
.arg = "VAR=value",
370
324
.doc = "Environment variable passed to all plugins" },
371
325
{ .name = "options-for", .key = 'o',
372
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
373
327
.doc = "Options passed only to specified plugin" },
374
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
375
329
.arg = "PLUGIN:ENV=value",
376
330
.doc = "Environment variable passed to specified plugin" },
377
331
{ .name = "disable", .key = 'd',
378
332
.arg = "PLUGIN",
379
333
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
383
334
{ .name = "plugin-dir", .key = 128,
384
335
.arg = "DIRECTORY",
385
336
.doc = "Specify a different plugin directory", .group = 2 },
386
{ .name = "config-file", .key = 129,
387
.arg = "FILE",
388
.doc = "Specify a different configuration file", .group = 2 },
389
{ .name = "userid", .key = 130,
390
.arg = "ID", .flags = 0,
391
.doc = "User ID the plugins will run as", .group = 3 },
392
{ .name = "groupid", .key = 131,
393
.arg = "ID", .flags = 0,
394
.doc = "Group ID the plugins will run as", .group = 3 },
395
{ .name = "debug", .key = 132,
396
.doc = "Debug mode", .group = 4 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
397
345
{ .name = NULL }
398
346
};
399
347
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
405
case 'g': /* --global-options */
406
if(arg != NULL){
407
char *plugin_option;
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
410
358
continue;
411
359
}
412
if(not add_argument(getplugin(NULL), plugin_option)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
413
361
perror("add_argument");
414
362
return ARGP_ERR_UNKNOWN;
415
363
}
416
364
}
417
365
}
418
366
break;
419
case 'G': /* --global-env */
367
case 'e':
420
368
if(arg == NULL){
421
369
break;
422
370
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
425
379
}
426
380
break;
427
case 'o': /* --options-for */
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
438
401
}
439
402
}
440
403
}
441
404
break;
442
case 'E': /* --env-for */
405
case 'f':
443
406
if(arg == NULL){
444
407
break;
445
408
}
448
411
if(envdef == NULL){
449
412
break;
450
413
}
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
453
420
perror("add_environment");
454
421
}
455
422
}
456
423
break;
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
460
427
if(p == NULL){
461
428
return ARGP_ERR_UNKNOWN;
462
429
}
463
430
p->disabled = true;
464
431
}
465
432
break;
466
case 'e': /* --enable */
467
if(arg != NULL){
468
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
471
}
472
p->disabled = false;
473
}
474
break;
475
case 128: /* --plugin-dir */
476
free(plugindir);
477
plugindir = strdup(arg);
478
if(plugindir == NULL){
479
perror("strdup");
480
}
481
break;
482
case 129: /* --config-file */
483
/* This is already done by parse_opt_config_file() */
484
break;
485
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
494
}
495
break;
496
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
505
}
506
break;
507
case 132: /* --debug */
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
case 131:
508
443
debug = true;
509
444
break;
510
/*
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
513
*/
514
case ARGP_KEY_ARG:
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
/* This option parser is the same as parse_opt() above, except it
531
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
535
switch(key){
536
case 'g': /* --global-options */
537
case 'G': /* --global-env */
538
case 'o': /* --options-for */
539
case 'E': /* --env-for */
540
case 'd': /* --disable */
541
case 'e': /* --enable */
542
case 128: /* --plugin-dir */
543
break;
544
case 129: /* --config-file */
545
free(argfile);
546
argfile = strdup(arg);
547
if(argfile == NULL){
548
perror("strdup");
549
}
550
break;
551
case 130: /* --userid */
552
case 131: /* --groupid */
553
case 132: /* --debug */
554
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
556
break;
557
default:
558
return ARGP_ERR_UNKNOWN;
559
}
560
return 0;
561
}
562
563
struct argp argp = { .options = options,
564
.parser = parse_opt_config_file,
565
.args_doc = "",
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
460
.doc = "Mandos plugin runner -- Run plugins" };
567
461
568
/* Parse using parse_opt_config_file() in order to get the custom
569
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
572
464
fprintf(stderr, "Unknown error while parsing arguments\n");
573
465
exitstatus = EXIT_FAILURE;
574
466
goto fallback;
575
467
}
576
577
/* Reset to the normal argument parser */
578
argp.parser = parse_opt;
579
580
/* Open the configfile if available */
581
if(argfile == NULL){
582
conffp = fopen(AFILE, "r");
583
} else {
584
conffp = fopen(argfile, "r");
585
}
468
469
conffp = fopen(argfile, "r");
586
470
if(conffp != NULL){
587
471
char *org_line = NULL;
588
472
char *p, *arg, *new_arg, *line;
589
473
size_t size = 0;
474
ssize_t sret;
590
475
const char whitespace_delims[] = " \r\t\f\v\n";
591
476
const char comment_delim[] = "#";
592
593
custom_argc = 1;
594
custom_argv = malloc(sizeof(char*) * 2);
595
if(custom_argv == NULL){
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
custom_argv[0] = argv[0];
601
custom_argv[1] = NULL;
602
603
/* for each line in the config file, strip whitespace and ignore
604
commented text */
477
605
478
while(true){
606
479
sret = getline(&org_line, &size, conffp);
607
480
if(sret == -1){
608
481
break;
609
482
}
610
483
611
484
line = org_line;
612
485
arg = strsep(&line, comment_delim);
613
486
while((p = strsep(&arg, whitespace_delims)) != NULL){
615
488
continue;
616
489
}
617
490
new_arg = strdup(p);
618
if(new_arg == NULL){
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
621
free(org_line);
622
goto fallback;
623
}
624
625
custom_argc += 1;
626
custom_argv = realloc(custom_argv, sizeof(char *)
627
* ((unsigned int) custom_argc + 1));
628
if(custom_argv == NULL){
629
perror("realloc");
630
exitstatus = EXIT_FAILURE;
631
free(org_line);
632
goto fallback;
633
}
634
custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
636
497
}
637
498
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
646
499
free(org_line);
647
} else {
500
} else{
648
501
/* Check for harmful errors and go to fallback. Other errors might
649
502
not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
504
perror("fopen");
652
505
exitstatus = EXIT_FAILURE;
653
506
goto fallback;
654
507
}
655
508
}
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
509
658
510
if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
662
514
fprintf(stderr, "Unknown error while parsing arguments\n");
663
515
exitstatus = EXIT_FAILURE;
664
516
goto fallback;
665
517
}
666
518
}
667
519
668
/* Parse actual command line arguments, to let them override the
669
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
674
goto fallback;
675
}
676
677
520
if(debug){
678
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
679
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
681
524
for(char **a = p->argv; *a != NULL; a++){
682
525
fprintf(stderr, "\tArg: %s\n", *a);
683
526
}
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
685
528
for(char **a = p->environ; *a != NULL; a++){
686
529
fprintf(stderr, "\t%s\n", *a);
687
530
}
688
531
}
689
532
}
690
533
691
/* Strip permissions down to nobody */
534
ret = setuid(uid);
535
if (ret == -1){
536
perror("setuid");
537
}
538
692
539
setgid(gid);
693
if(ret == -1){
540
if (ret == -1){
694
541
perror("setgid");
695
542
}
696
ret = setuid(uid);
697
if(ret == -1){
698
perror("setuid");
699
}
700
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
705
}
706
543
544
dir = opendir(plugindir);
707
545
if(dir == NULL){
708
546
perror("Could not open plugin dir");
709
547
exitstatus = EXIT_FAILURE;
725
563
726
564
FD_ZERO(&rfds_all);
727
565
728
/* Read and execute any executable in the plugin directory*/
729
566
while(true){
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
567
dirst = readdir(dir);
733
568
734
/* All directory entries have been processed */
569
// All directory entries have been processed
735
570
if(dirst == NULL){
736
if(errno == EBADF){
571
if (errno == EBADF){
737
572
perror("readdir");
738
573
exitstatus = EXIT_FAILURE;
739
574
goto fallback;
743
578
744
579
d_name_len = strlen(dirst->d_name);
745
580
746
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
747
582
{
748
583
bool bad_name = false;
749
584
751
586
752
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
753
588
".dpkg-old",
754
".dpkg-bak",
755
589
".dpkg-divert", NULL };
756
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
757
591
size_t pre_len = strlen(*pre);
765
599
break;
766
600
}
767
601
}
602
768
603
if(bad_name){
769
604
continue;
770
605
}
606
771
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
772
608
size_t suf_len = strlen(*suf);
773
609
if((d_name_len >= suf_len)
786
622
continue;
787
623
}
788
624
}
789
625
790
626
char *filename;
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
793
dirst->d_name));
794
} else {
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
796
plugindir,
797
dirst->d_name));
798
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
799
628
if(ret < 0){
800
629
perror("asprintf");
801
630
continue;
802
631
}
803
632
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
633
ret = stat(filename, &st);
634
if (ret == -1){
806
635
perror("stat");
807
636
free(filename);
808
637
continue;
809
638
}
810
639
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
814
641
if(debug){
815
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
643
" with bad type or mode\n", filename);
818
645
free(filename);
819
646
continue;
820
647
}
821
822
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
823
649
if(p == NULL){
824
650
perror("getplugin");
825
651
free(filename);
835
661
}
836
662
{
837
663
/* Add global arguments to argument list for this plugin */
838
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
839
665
if(g != NULL){
840
666
for(char **a = g->argv + 1; *a != NULL; a++){
841
667
if(not add_argument(p, *a)){
844
670
}
845
671
/* Add global environment variables */
846
672
for(char **e = g->environ; *e != NULL; e++){
847
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
848
674
perror("add_environment");
849
675
}
850
676
}
855
681
process, too. */
856
682
if(p->environ[0] != NULL){
857
683
for(char **e = environ; *e != NULL; e++){
858
if(not add_environment(p, *e, false)){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
859
690
perror("add_environment");
860
691
}
861
692
}
862
693
}
863
694
864
695
int pipefd[2];
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
696
ret = pipe(pipefd);
697
if (ret == -1){
867
698
perror("pipe");
868
699
exitstatus = EXIT_FAILURE;
869
700
goto fallback;
870
701
}
871
/* Ask OS to automatic close the pipe on exec */
872
702
ret = set_cloexec_flag(pipefd[0]);
873
703
if(ret < 0){
874
704
perror("set_cloexec_flag");
882
712
goto fallback;
883
713
}
884
714
/* Block SIGCHLD until process is safely in process list */
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
888
716
if(ret < 0){
889
717
perror("sigprocmask");
890
718
exitstatus = EXIT_FAILURE;
891
719
goto fallback;
892
720
}
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
721
// Starting a new process to be watched
722
pid_t pid = fork();
898
723
if(pid == -1){
899
724
perror("fork");
900
725
exitstatus = EXIT_FAILURE;
907
732
perror("sigaction");
908
733
_exit(EXIT_FAILURE);
909
734
}
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
736
if(ret < 0){
912
737
perror("sigprocmask");
913
738
_exit(EXIT_FAILURE);
914
739
}
915
740
916
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
917
742
if(ret == -1){
918
743
perror("dup2");
937
762
}
938
763
/* no return */
939
764
}
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
765
/* parent process */
943
766
free(filename);
944
plugin *new_plugin = getplugin(dirst->d_name);
945
if(new_plugin == NULL){
946
perror("getplugin");
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
NULL)));
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
950
772
if(ret < 0){
951
perror("sigprocmask");
773
perror("sigprocmask");
952
774
}
953
775
exitstatus = EXIT_FAILURE;
954
776
goto fallback;
955
777
}
956
778
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
960
784
/* Unblock SIGCHLD so signal handler can be run if this process
961
785
has already completed */
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
965
787
if(ret < 0){
966
788
perror("sigprocmask");
967
789
exitstatus = EXIT_FAILURE;
968
790
goto fallback;
969
791
}
970
792
971
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
972
794
973
if(maxfd < new_plugin->fd){
974
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
975
797
}
798
976
799
}
977
800
978
TEMP_FAILURE_RETRY(closedir(dir));
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
closedir(dir);
979
805
dir = NULL;
980
free_plugin(getplugin(NULL));
981
982
for(plugin *p = plugin_list; p != NULL; p = p->next){
983
if(p->pid != 0){
984
break;
985
}
986
if(p->next == NULL){
987
fprintf(stderr, "No plugin processes started. Incorrect plugin"
988
" directory?\n");
989
free_plugin_list();
990
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
991
811
}
992
993
/* Main loop while running plugins exist */
994
while(plugin_list){
812
while(process_list){
995
813
fd_set rfds = rfds_all;
996
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
997
if(select_ret == -1 and errno != EINTR){
815
if (select_ret == -1){
998
816
perror("select");
999
817
exitstatus = EXIT_FAILURE;
1000
818
goto fallback;
1001
819
}
1002
820
/* OK, now either a process completed, or something can be read
1003
821
from one of them */
1004
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
1005
823
/* Is this process completely done? */
1006
if(proc->completed and proc->eof){
824
if(proc->eof and proc->completed){
1007
825
/* Only accept the plugin output if it exited cleanly */
1008
826
if(not WIFEXITED(proc->status)
1009
827
or WEXITSTATUS(proc->status) != 0){
1010
828
/* Bad exit by plugin */
1011
1012
829
if(debug){
1013
830
if(WIFEXITED(proc->status)){
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
1017
833
WEXITSTATUS(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
837
WTERMSIG(proc->status));
1024
838
} else if(WCOREDUMP(proc->status)){
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
1027
841
}
1028
842
}
1029
1030
843
/* Remove the plugin */
1031
844
FD_CLR(proc->fd, &rfds_all);
1032
1033
845
/* Block signal while modifying process_list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1038
847
if(ret < 0){
1039
848
perror("sigprocmask");
1040
849
exitstatus = EXIT_FAILURE;
1041
850
goto fallback;
1042
851
}
1043
1044
plugin *next_plugin = proc->next;
1045
free_plugin(proc);
1046
proc = next_plugin;
1047
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
1048
865
/* We are done modifying process list, so unblock signal */
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1052
868
if(ret < 0){
1053
869
perror("sigprocmask");
1054
exitstatus = EXIT_FAILURE;
1055
goto fallback;
1056
}
1057
1058
if(plugin_list == NULL){
1059
break;
1060
}
1061
1062
continue;
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
1063
877
}
1064
1065
878
/* This process exited nicely, so print its buffer */
1066
1067
bool bret = print_out_password(proc->buffer,
1068
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1069
881
if(not bret){
1070
882
perror("print_out_password");
1071
883
exitstatus = EXIT_FAILURE;
1072
884
}
1073
885
goto fallback;
1074
886
}
1075
1076
887
/* This process has not completed. Does it have any output? */
1077
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1078
889
/* This process had nothing to say at this time */
1079
proc = proc->next;
1080
890
continue;
1081
891
}
1082
892
/* Before reading, make the process' data buffer large enough */
1083
893
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1084
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
1085
895
+ (size_t) BUFFER_SIZE);
1086
if(proc->buffer == NULL){
896
if (proc->buffer == NULL){
1087
897
perror("malloc");
1088
898
exitstatus = EXIT_FAILURE;
1089
899
goto fallback;
1091
901
proc->buffer_size += BUFFER_SIZE;
1092
902
}
1093
903
/* Read from the process */
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1095
proc->buffer
1096
+ proc->buffer_length,
1097
BUFFER_SIZE));
1098
if(sret < 0){
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1099
907
/* Read error from this process; ignore the error */
1100
proc = proc->next;
1101
908
continue;
1102
909
}
1103
if(sret == 0){
910
if(ret == 0){
1104
911
/* got EOF */
1105
912
proc->eof = true;
1106
913
} else {
1107
proc->buffer_length += (size_t) sret;
914
proc->buffer_length += (size_t) ret;
1108
915
}
1109
916
}
1110
917
}
1111
1112
918
919
1113
920
fallback:
1114
921
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1116
/* Fallback if all plugins failed, none are found or an error
1117
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1118
924
bool bret;
1119
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1120
926
char *passwordbuffer = getpass("Password: ");
1121
size_t len = strlen(passwordbuffer);
1122
/* Strip trailing newline */
1123
if(len > 0 and passwordbuffer[len-1] == '\n'){
1124
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1125
len--;
1126
}
1127
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1128
928
if(not bret){
1129
929
perror("print_out_password");
1130
930
exitstatus = EXIT_FAILURE;
1137
937
perror("sigaction");
1138
938
exitstatus = EXIT_FAILURE;
1139
939
}
1140
940
1141
941
if(custom_argv != NULL){
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1143
943
free(*arg);
1144
944
}
1145
945
free(custom_argv);
1146
946
}
947
free_plugin_list(plugin_list);
1147
948
1148
949
if(dir != NULL){
1149
950
closedir(dir);
1150
951
}
1151
952
1152
/* Kill the processes */
1153
for(plugin *p = plugin_list; p != NULL; p = p->next){
1154
if(p->pid != 0){
1155
close(p->fd);
1156
ret = kill(p->pid, SIGTERM);
1157
if(ret == -1 and errno != ESRCH){
1158
/* Set-uid proccesses might not get closed */
1159
perror("kill");
1160
}
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1161
961
}
962
free(process_list->buffer);
963
free(process_list);
1162
964
}
1163
965
1164
966
/* Wait for any remaining child processes to terminate */
1165
do {
967
do{
1166
968
ret = wait(NULL);
1167
969
} while(ret >= 0);
1168
970
if(errno != ECHILD){
1169
971
perror("wait");
1170
972
}
1171
973
1172
free_plugin_list();
1173
1174
free(plugindir);
1175
free(argfile);
1176
1177
974
return exitstatus;
1178
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0