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 93
- compare with another revision
- download diff
- download tarball
- view history from revision 93
- Committer: Teddy Hogeborn
- Date: 2008-08-20 03:22:45 UTC
- Revision ID: teddy@fukt.bsnet.se-20080820032245-ue341vdvzqdsg68l
* mandos (string_to_delta): Accept a whitespace-separated sequence of
intervals and return the sum. This allows
"5m 30s" to be valid.
(main): Provide an empty default value for the "host" option for
"clients.conf", making it no longer a required option.
* mandos-clients.conf.xml: Removed <?xml-stylesheet>.
(DESCRIPTION): Improved text.
(DEFAULTS): Renamed to "OPTIONS". Improved text for "timeout" and
"interval".
(CLIENTS): Removed; content moved to "OPTIONS".
(EXPANSION): New section; document %(foo)s and %%(foo)s expansion.
(FILES): Moved to before "EXAMPLES".
(BUGS): New section.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7). Renamed
example section "example_client" to "foo". Changed
example "host" setting to a more reasonable example host
name. Added additional example client "bar".
* mandos-conf.xml: Removed OVERVIEW entity.
intervals and return the sum. This allows
"5m 30s" to be valid.
(main): Provide an empty default value for the "host" option for
"clients.conf", making it no longer a required option.
* mandos-clients.conf.xml: Removed <?xml-stylesheet>.
(DESCRIPTION): Improved text.
(DEFAULTS): Renamed to "OPTIONS". Improved text for "timeout" and
"interval".
(CLIENTS): Removed; content moved to "OPTIONS".
(EXPANSION): New section; document %(foo)s and %%(foo)s expansion.
(FILES): Moved to before "EXAMPLES".
(BUGS): New section.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7). Renamed
example section "example_client" to "foo". Changed
example "host" setting to a more reasonable example host
name. Added additional example client "bar".
* mandos-conf.xml: Removed OVERVIEW entity.
- 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
104
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
105
if (new_plugin == NULL){
115
106
return NULL;
116
107
}
117
char *copy_name = NULL;
118
if(name != NULL){
119
copy_name = strdup(name);
120
if(copy_name == NULL){
121
free(new_plugin);
122
return NULL;
123
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
124
111
}
125
112
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
130
118
131
119
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
133
free(copy_name);
120
if (new_plugin->argv == NULL){
134
121
free(new_plugin);
135
122
return NULL;
136
123
}
137
124
new_plugin->argv[0] = copy_name;
138
125
new_plugin->argv[1] = NULL;
139
126
140
127
new_plugin->environ = malloc(sizeof(char *));
141
128
if(new_plugin->environ == NULL){
142
free(copy_name);
143
129
free(new_plugin->argv);
144
130
free(new_plugin);
145
131
return NULL;
146
132
}
147
133
new_plugin->environ[0] = NULL;
148
149
134
/* Append the new plugin to the list */
150
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
151
136
return new_plugin;
152
137
}
153
138
183
168
}
184
169
185
170
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
187
172
if(p == NULL){
188
173
return false;
189
174
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
207
175
return add_to_char_array(def, &(p->environ), &(p->envc));
208
176
}
209
177
178
210
179
/*
211
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
181
* Descriptor Flags".
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
214
183
*/
215
static int set_cloexec_flag(int fd){
184
static int set_cloexec_flag(int fd)
185
{
216
186
int ret = fcntl(fd, F_GETFD, 0);
217
187
/* If reading the flags failed, return error indication now. */
218
188
if(ret < 0){
222
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
223
193
}
224
194
195
process *process_list = NULL;
225
196
226
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
227
198
status. */
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
230
while(true){
231
plugin *proc = plugin_list;
232
int status;
233
pid_t pid = waitpid(-1, &status, WNOHANG);
234
if(pid == 0){
235
/* Only still running child processes */
236
break;
237
}
238
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
242
}
243
perror("waitpid");
244
}
245
246
/* A child exited, find it in process_list */
247
while(proc != NULL and proc->pid != pid){
248
proc = proc->next;
249
}
250
if(proc == NULL){
251
/* Process not found in process list */
252
continue;
253
}
254
proc->status = status;
255
proc->completed = 1;
256
}
257
errno = old_errno;
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
258
216
}
259
217
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
262
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
263
223
for(size_t written = 0; written < length; written += (size_t)ret){
264
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
225
length - written));
270
230
return true;
271
231
}
272
232
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
297
239
}
298
}
299
300
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
301
252
}
302
253
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
306
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
307
268
}
308
269
309
270
int main(int argc, char *argv[]){
310
char *plugindir = NULL;
311
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
312
273
FILE *conffp;
313
274
size_t d_name_len;
314
275
DIR *dir = NULL;
316
277
struct stat st;
317
278
fd_set rfds_all;
318
279
int ret, maxfd = 0;
319
ssize_t sret;
320
280
uid_t uid = 65534;
321
281
gid_t gid = 65534;
322
282
bool debug = false;
338
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
339
299
if(ret == -1){
340
300
perror("sigaction");
341
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
342
302
goto fallback;
343
303
}
344
304
347
307
{ .name = "global-options", .key = 'g',
348
308
.arg = "OPTION[,OPTION[,...]]",
349
309
.doc = "Options passed to all plugins" },
350
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
351
311
.arg = "VAR=value",
352
312
.doc = "Environment variable passed to all plugins" },
353
313
{ .name = "options-for", .key = 'o',
354
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
355
315
.doc = "Options passed only to specified plugin" },
356
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
357
317
.arg = "PLUGIN:ENV=value",
358
318
.doc = "Environment variable passed to specified plugin" },
359
319
{ .name = "disable", .key = 'd',
360
320
.arg = "PLUGIN",
361
321
.doc = "Disable a specific plugin", .group = 1 },
362
{ .name = "enable", .key = 'e',
363
.arg = "PLUGIN",
364
.doc = "Enable a specific plugin", .group = 1 },
365
322
{ .name = "plugin-dir", .key = 128,
366
323
.arg = "DIRECTORY",
367
324
.doc = "Specify a different plugin directory", .group = 2 },
368
{ .name = "config-file", .key = 129,
369
.arg = "FILE",
370
.doc = "Specify a different configuration file", .group = 2 },
371
{ .name = "userid", .key = 130,
372
.arg = "ID", .flags = 0,
373
.doc = "User ID the plugins will run as", .group = 3 },
374
{ .name = "groupid", .key = 131,
375
.arg = "ID", .flags = 0,
376
.doc = "Group ID the plugins will run as", .group = 3 },
377
{ .name = "debug", .key = 132,
378
.doc = "Debug mode", .group = 4 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
379
333
{ .name = NULL }
380
334
};
381
335
382
error_t parse_opt(int key, char *arg, __attribute__((unused))
383
struct argp_state *state){
384
switch(key){
385
char *tmp;
386
intmax_t tmpmax;
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
392
346
continue;
393
347
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
395
349
perror("add_argument");
396
350
return ARGP_ERR_UNKNOWN;
397
351
}
398
352
}
399
353
}
400
354
break;
401
case 'G': /* --global-env */
355
case 'e':
402
356
if(arg == NULL){
403
357
break;
404
358
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
407
367
}
408
368
break;
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
420
389
}
421
390
}
422
391
}
423
392
break;
424
case 'E': /* --env-for */
393
case 'f':
425
394
if(arg == NULL){
426
395
break;
427
396
}
430
399
if(envdef == NULL){
431
400
break;
432
401
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
408
perror("add_environment");
436
409
}
437
410
}
438
411
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
442
415
if(p == NULL){
443
416
return ARGP_ERR_UNKNOWN;
444
417
}
445
418
p->disabled = true;
446
419
}
447
420
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
490
431
debug = true;
491
432
break;
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
448
.doc = "Mandos plugin runner -- Run plugins" };
549
449
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
554
452
fprintf(stderr, "Unknown error while parsing arguments\n");
555
453
exitstatus = EXIT_FAILURE;
556
454
goto fallback;
557
455
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
456
457
conffp = fopen(argfile, "r");
568
458
if(conffp != NULL){
569
459
char *org_line = NULL;
570
460
char *p, *arg, *new_arg, *line;
571
461
size_t size = 0;
462
ssize_t sret;
572
463
const char whitespace_delims[] = " \r\t\f\v\n";
573
464
const char comment_delim[] = "#";
574
575
custom_argc = 1;
576
custom_argv = malloc(sizeof(char*) * 2);
577
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
custom_argv[0] = argv[0];
583
custom_argv[1] = NULL;
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
465
587
466
while(true){
588
467
sret = getline(&org_line, &size, conffp);
589
468
if(sret == -1){
590
469
break;
591
470
}
592
471
593
472
line = org_line;
594
473
arg = strsep(&line, comment_delim);
595
474
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
476
continue;
598
477
}
599
478
new_arg = strdup(p);
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
607
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
615
}
616
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
618
485
}
619
486
}
620
do{
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
623
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
487
free(org_line);
629
} else {
488
} else{
630
489
/* Check for harmful errors and go to fallback. Other errors might
631
490
not affect opening plugins */
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
633
492
perror("fopen");
634
493
exitstatus = EXIT_FAILURE;
635
494
goto fallback;
636
495
}
637
496
}
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
497
640
498
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
644
502
fprintf(stderr, "Unknown error while parsing arguments\n");
645
503
exitstatus = EXIT_FAILURE;
646
504
goto fallback;
647
505
}
648
506
}
649
507
650
/* Parse actual command line arguments, to let them override the
651
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
656
goto fallback;
657
}
658
659
508
if(debug){
660
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
661
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
663
512
for(char **a = p->argv; *a != NULL; a++){
664
513
fprintf(stderr, "\tArg: %s\n", *a);
665
514
}
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
667
516
for(char **a = p->environ; *a != NULL; a++){
668
517
fprintf(stderr, "\t%s\n", *a);
669
518
}
670
519
}
671
520
}
672
521
673
/* Strip permissions down to nobody */
522
ret = setuid(uid);
523
if (ret == -1){
524
perror("setuid");
525
}
526
674
527
setgid(gid);
675
if(ret == -1){
528
if (ret == -1){
676
529
perror("setgid");
677
530
}
678
ret = setuid(uid);
679
if(ret == -1){
680
perror("setuid");
681
}
682
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
687
}
688
531
532
dir = opendir(plugindir);
689
533
if(dir == NULL){
690
534
perror("Could not open plugin dir");
691
535
exitstatus = EXIT_FAILURE;
707
551
708
552
FD_ZERO(&rfds_all);
709
553
710
/* Read and execute any executable in the plugin directory*/
711
554
while(true){
712
555
dirst = readdir(dir);
713
556
714
/* All directory entries have been processed */
557
// All directory entries have been processed
715
558
if(dirst == NULL){
716
if(errno == EBADF){
559
if (errno == EBADF){
717
560
perror("readdir");
718
561
exitstatus = EXIT_FAILURE;
719
562
goto fallback;
723
566
724
567
d_name_len = strlen(dirst->d_name);
725
568
726
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
727
570
{
728
571
bool bad_name = false;
729
572
731
574
732
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
733
576
".dpkg-old",
734
".dpkg-bak",
735
577
".dpkg-divert", NULL };
736
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
737
579
size_t pre_len = strlen(*pre);
745
587
break;
746
588
}
747
589
}
590
748
591
if(bad_name){
749
592
continue;
750
593
}
594
751
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
752
596
size_t suf_len = strlen(*suf);
753
597
if((d_name_len >= suf_len)
766
610
continue;
767
611
}
768
612
}
769
613
770
614
char *filename;
771
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
773
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
775
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
776
616
if(ret < 0){
777
617
perror("asprintf");
778
618
continue;
779
619
}
780
620
781
621
ret = stat(filename, &st);
782
if(ret == -1){
622
if (ret == -1){
783
623
perror("stat");
784
624
free(filename);
785
625
continue;
786
626
}
787
627
788
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
790
629
if(debug){
791
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
792
631
" with bad type or mode\n", filename);
794
633
free(filename);
795
634
continue;
796
635
}
797
798
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
799
637
if(p == NULL){
800
638
perror("getplugin");
801
639
free(filename);
811
649
}
812
650
{
813
651
/* Add global arguments to argument list for this plugin */
814
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
815
653
if(g != NULL){
816
654
for(char **a = g->argv + 1; *a != NULL; a++){
817
655
if(not add_argument(p, *a)){
820
658
}
821
659
/* Add global environment variables */
822
660
for(char **e = g->environ; *e != NULL; e++){
823
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
824
662
perror("add_environment");
825
663
}
826
664
}
831
669
process, too. */
832
670
if(p->environ[0] != NULL){
833
671
for(char **e = environ; *e != NULL; e++){
834
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
835
678
perror("add_environment");
836
679
}
837
680
}
838
681
}
839
682
840
int pipefd[2];
683
int pipefd[2];
841
684
ret = pipe(pipefd);
842
if(ret == -1){
685
if (ret == -1){
843
686
perror("pipe");
844
687
exitstatus = EXIT_FAILURE;
845
688
goto fallback;
846
689
}
847
/* Ask OS to automatic close the pipe on exec */
848
690
ret = set_cloexec_flag(pipefd[0]);
849
691
if(ret < 0){
850
692
perror("set_cloexec_flag");
858
700
goto fallback;
859
701
}
860
702
/* Block SIGCHLD until process is safely in process list */
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
862
704
if(ret < 0){
863
705
perror("sigprocmask");
864
706
exitstatus = EXIT_FAILURE;
865
707
goto fallback;
866
708
}
867
/* Starting a new process to be watched */
709
// Starting a new process to be watched
868
710
pid_t pid = fork();
869
711
if(pid == -1){
870
712
perror("fork");
878
720
perror("sigaction");
879
721
_exit(EXIT_FAILURE);
880
722
}
881
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
882
724
if(ret < 0){
883
725
perror("sigprocmask");
884
726
_exit(EXIT_FAILURE);
885
727
}
886
728
887
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
888
730
if(ret == -1){
889
731
perror("dup2");
908
750
}
909
751
/* no return */
910
752
}
911
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
913
754
free(filename);
914
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
760
if(ret < 0){
919
perror("sigprocmask");
761
perror("sigprocmask");
920
762
}
921
763
exitstatus = EXIT_FAILURE;
922
764
goto fallback;
923
765
}
924
766
925
new_plugin->pid = pid;
926
new_plugin->fd = pipefd[0];
927
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
928
772
/* Unblock SIGCHLD so signal handler can be run if this process
929
773
has already completed */
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
931
775
if(ret < 0){
932
776
perror("sigprocmask");
933
777
exitstatus = EXIT_FAILURE;
934
778
goto fallback;
935
779
}
936
780
937
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
938
782
939
if(maxfd < new_plugin->fd){
940
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
941
785
}
786
942
787
}
943
788
789
free_plugin_list(plugin_list);
790
944
791
closedir(dir);
945
792
dir = NULL;
946
free_plugin(getplugin(NULL));
947
948
for(plugin *p = plugin_list; p != NULL; p = p->next){
949
if(p->pid != 0){
950
break;
951
}
952
if(p->next == NULL){
953
fprintf(stderr, "No plugin processes started. Incorrect plugin"
954
" directory?\n");
955
free_plugin_list();
956
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
957
798
}
958
959
/* Main loop while running plugins exist */
960
while(plugin_list){
799
while(process_list){
961
800
fd_set rfds = rfds_all;
962
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
963
if(select_ret == -1){
802
if (select_ret == -1){
964
803
perror("select");
965
804
exitstatus = EXIT_FAILURE;
966
805
goto fallback;
967
806
}
968
807
/* OK, now either a process completed, or something can be read
969
808
from one of them */
970
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
971
810
/* Is this process completely done? */
972
if(proc->completed and proc->eof){
811
if(proc->eof and proc->completed){
973
812
/* Only accept the plugin output if it exited cleanly */
974
813
if(not WIFEXITED(proc->status)
975
814
or WEXITSTATUS(proc->status) != 0){
976
815
/* Bad exit by plugin */
977
978
816
if(debug){
979
817
if(WIFEXITED(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
983
820
WEXITSTATUS(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
824
WTERMSIG(proc->status));
990
825
} else if(WCOREDUMP(proc->status)){
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
993
828
}
994
829
}
995
996
830
/* Remove the plugin */
997
831
FD_CLR(proc->fd, &rfds_all);
998
999
832
/* Block signal while modifying process_list */
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1001
834
if(ret < 0){
1002
835
perror("sigprocmask");
1003
836
exitstatus = EXIT_FAILURE;
1004
837
goto fallback;
1005
838
}
1006
1007
plugin *next_plugin = proc->next;
1008
free_plugin(proc);
1009
proc = next_plugin;
1010
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
1011
852
/* We are done modifying process list, so unblock signal */
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1014
855
if(ret < 0){
1015
856
perror("sigprocmask");
1016
exitstatus = EXIT_FAILURE;
1017
goto fallback;
1018
}
1019
1020
if(plugin_list == NULL){
1021
break;
1022
}
1023
1024
continue;
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1025
864
}
1026
1027
865
/* This process exited nicely, so print its buffer */
1028
1029
bool bret = print_out_password(proc->buffer,
1030
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1031
868
if(not bret){
1032
869
perror("print_out_password");
1033
870
exitstatus = EXIT_FAILURE;
1034
871
}
1035
872
goto fallback;
1036
873
}
1037
1038
874
/* This process has not completed. Does it have any output? */
1039
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1040
876
/* This process had nothing to say at this time */
1041
proc = proc->next;
1042
877
continue;
1043
878
}
1044
879
/* Before reading, make the process' data buffer large enough */
1045
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1046
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
1047
882
+ (size_t) BUFFER_SIZE);
1048
if(proc->buffer == NULL){
883
if (proc->buffer == NULL){
1049
884
perror("malloc");
1050
885
exitstatus = EXIT_FAILURE;
1051
886
goto fallback;
1053
888
proc->buffer_size += BUFFER_SIZE;
1054
889
}
1055
890
/* Read from the process */
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1058
if(sret < 0){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1059
894
/* Read error from this process; ignore the error */
1060
proc = proc->next;
1061
895
continue;
1062
896
}
1063
if(sret == 0){
897
if(ret == 0){
1064
898
/* got EOF */
1065
899
proc->eof = true;
1066
900
} else {
1067
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1068
902
}
1069
903
}
1070
904
}
1071
1072
905
906
1073
907
fallback:
1074
908
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1076
/* Fallback if all plugins failed, none are found or an error
1077
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1078
911
bool bret;
1079
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1080
913
char *passwordbuffer = getpass("Password: ");
1081
size_t len = strlen(passwordbuffer);
1082
/* Strip trailing newline */
1083
if(len > 0 and passwordbuffer[len-1] == '\n'){
1084
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1085
len--;
1086
}
1087
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1088
915
if(not bret){
1089
916
perror("print_out_password");
1090
917
exitstatus = EXIT_FAILURE;
1097
924
perror("sigaction");
1098
925
exitstatus = EXIT_FAILURE;
1099
926
}
1100
927
1101
928
if(custom_argv != NULL){
1102
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1103
930
free(*arg);
1104
931
}
1105
932
free(custom_argv);
1106
933
}
934
free_plugin_list(plugin_list);
1107
935
1108
936
if(dir != NULL){
1109
937
closedir(dir);
1110
938
}
1111
939
1112
/* Kill the processes */
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
if(p->pid != 0){
1115
close(p->fd);
1116
ret = kill(p->pid, SIGTERM);
1117
if(ret == -1 and errno != ESRCH){
1118
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1120
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1121
948
}
949
free(process_list->buffer);
950
free(process_list);
1122
951
}
1123
952
1124
953
/* Wait for any remaining child processes to terminate */
1129
958
perror("wait");
1130
959
}
1131
960
1132
free_plugin_list();
1133
1134
free(plugindir);
1135
free(argfile);
1136
1137
961
return exitstatus;
1138
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0