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- Committer: Teddy Hogeborn
- Date: 2008-08-25 06:44:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825064413-smqg5qwxfvhkeop4
* Makefile (DOCBOOKTOMAN): Only cd to one directory.
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
- 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,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
66
72
67
#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;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
78
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
80
87
typedef struct plugin{
81
88
char *name; /* can be NULL or any plugin name */
82
89
char **argv;
84
91
char **environ;
85
92
int envc;
86
93
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
94
struct plugin *next;
98
95
} plugin;
99
96
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))){
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
109
101
return p;
110
102
}
111
103
}
112
104
/* 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){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
118
107
return NULL;
119
108
}
120
109
char *copy_name = NULL;
121
110
if(name != NULL){
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
125
112
if(copy_name == NULL){
126
free(new_plugin);
127
113
return NULL;
128
114
}
129
115
}
130
116
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
135
122
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){
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
140
125
free(copy_name);
141
126
free(new_plugin);
142
127
return NULL;
143
128
}
144
129
new_plugin->argv[0] = copy_name;
145
130
new_plugin->argv[1] = NULL;
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
150
133
if(new_plugin->environ == NULL){
151
134
free(copy_name);
152
135
free(new_plugin->argv);
154
137
return NULL;
155
138
}
156
139
new_plugin->environ[0] = NULL;
157
158
140
/* Append the new plugin to the list */
159
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
160
142
return new_plugin;
161
143
}
162
144
164
146
static bool add_to_char_array(const char *new, char ***array,
165
147
int *len){
166
148
/* 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);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
171
151
/* Malloc check */
172
152
if(*array == NULL){
173
153
return false;
174
154
}
175
155
/* Make a copy of the new string */
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
180
157
if(copy == NULL){
181
158
return false;
182
159
}
197
174
}
198
175
199
176
/* Add to a plugin's environment */
200
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
201
178
if(p == NULL){
202
179
return false;
203
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
225
182
}
226
183
184
227
185
/*
228
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
187
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
231
189
*/
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
234
193
/* If reading the flags failed, return error indication now. */
235
194
if(ret < 0){
236
195
return ret;
237
196
}
238
197
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
241
199
}
242
200
201
process *process_list = NULL;
243
202
244
203
/* Mark processes as completed when they exit, and save their exit
245
204
status. */
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
248
206
while(true){
249
plugin *proc = plugin_list;
207
process *proc = process_list;
250
208
int status;
251
209
pid_t pid = waitpid(-1, &status, WNOHANG);
252
210
if(pid == 0){
254
212
break;
255
213
}
256
214
if(pid == -1){
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
215
if (errno != ECHILD){
216
perror("waitpid");
260
217
}
261
perror("waitpid");
218
/* No child processes */
219
break;
262
220
}
263
221
264
222
/* A child exited, find it in process_list */
265
223
while(proc != NULL and proc->pid != pid){
266
224
proc = proc->next;
270
228
continue;
271
229
}
272
230
proc->status = status;
273
proc->completed = 1;
231
proc->completed = true;
274
232
}
275
errno = old_errno;
276
233
}
277
234
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
280
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
281
240
for(size_t written = 0; written < length; written += (size_t)ret){
282
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
283
242
length - written));
288
247
return true;
289
248
}
290
249
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
}
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
315
256
}
316
}
317
318
free(plugin_node);
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
319
270
}
320
271
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
324
284
}
325
285
}
326
286
327
287
int main(int argc, char *argv[]){
328
char *plugindir = NULL;
329
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
330
290
FILE *conffp;
331
291
size_t d_name_len;
332
292
DIR *dir = NULL;
334
294
struct stat st;
335
295
fd_set rfds_all;
336
296
int ret, maxfd = 0;
337
ssize_t sret;
338
297
uid_t uid = 65534;
339
298
gid_t gid = 65534;
340
299
bool debug = false;
365
324
{ .name = "global-options", .key = 'g',
366
325
.arg = "OPTION[,OPTION[,...]]",
367
326
.doc = "Options passed to all plugins" },
368
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
369
328
.arg = "VAR=value",
370
329
.doc = "Environment variable passed to all plugins" },
371
330
{ .name = "options-for", .key = 'o',
372
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
373
332
.doc = "Options passed only to specified plugin" },
374
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
375
334
.arg = "PLUGIN:ENV=value",
376
335
.doc = "Environment variable passed to specified plugin" },
377
336
{ .name = "disable", .key = 'd',
378
337
.arg = "PLUGIN",
379
338
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
383
339
{ .name = "plugin-dir", .key = 128,
384
340
.arg = "DIRECTORY",
385
341
.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 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
397
350
{ .name = NULL }
398
351
};
399
352
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'){
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
410
363
continue;
411
364
}
412
if(not add_argument(getplugin(NULL), plugin_option)){
365
if(not add_argument(getplugin(NULL, plugins), p)){
413
366
perror("add_argument");
414
367
return ARGP_ERR_UNKNOWN;
415
368
}
416
369
}
417
370
}
418
371
break;
419
case 'G': /* --global-env */
372
case 'e':
420
373
if(arg == NULL){
421
374
break;
422
375
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
425
384
}
426
385
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;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
438
406
}
439
407
}
440
408
}
441
409
break;
442
case 'E': /* --env-for */
410
case 'f':
443
411
if(arg == NULL){
444
412
break;
445
413
}
448
416
if(envdef == NULL){
449
417
break;
450
418
}
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
453
425
perror("add_environment");
454
426
}
455
427
}
456
428
break;
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
460
432
if(p == NULL){
461
433
return ARGP_ERR_UNKNOWN;
462
434
}
463
435
p->disabled = true;
464
436
}
465
437
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 */
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
508
448
debug = true;
509
449
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 = "",
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
465
.doc = "Mandos plugin runner -- Run plugins" };
567
466
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){
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
572
469
fprintf(stderr, "Unknown error while parsing arguments\n");
573
470
exitstatus = EXIT_FAILURE;
574
471
goto fallback;
575
472
}
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
}
473
474
conffp = fopen(argfile, "r");
586
475
if(conffp != NULL){
587
476
char *org_line = NULL;
588
477
char *p, *arg, *new_arg, *line;
589
478
size_t size = 0;
479
ssize_t sret;
590
480
const char whitespace_delims[] = " \r\t\f\v\n";
591
481
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 */
482
605
483
while(true){
606
484
sret = getline(&org_line, &size, conffp);
607
485
if(sret == -1){
608
486
break;
609
487
}
610
488
611
489
line = org_line;
612
490
arg = strsep(&line, comment_delim);
613
491
while((p = strsep(&arg, whitespace_delims)) != NULL){
615
493
continue;
616
494
}
617
495
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;
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
636
502
}
637
503
}
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
504
free(org_line);
647
} else {
505
} else{
648
506
/* Check for harmful errors and go to fallback. Other errors might
649
507
not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
509
perror("fopen");
652
510
exitstatus = EXIT_FAILURE;
653
511
goto fallback;
654
512
}
655
513
}
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
514
658
515
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){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
662
520
fprintf(stderr, "Unknown error while parsing arguments\n");
663
521
exitstatus = EXIT_FAILURE;
664
522
goto fallback;
665
523
}
666
524
}
667
525
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
526
if(debug){
678
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
679
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
681
530
for(char **a = p->argv; *a != NULL; a++){
682
531
fprintf(stderr, "\tArg: %s\n", *a);
683
532
}
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
685
534
for(char **a = p->environ; *a != NULL; a++){
686
535
fprintf(stderr, "\t%s\n", *a);
687
536
}
688
537
}
689
538
}
690
539
691
/* Strip permissions down to nobody */
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
692
545
setgid(gid);
693
if(ret == -1){
546
if (ret == -1){
694
547
perror("setgid");
695
548
}
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
549
550
dir = opendir(plugindir);
707
551
if(dir == NULL){
708
552
perror("Could not open plugin dir");
709
553
exitstatus = EXIT_FAILURE;
725
569
726
570
FD_ZERO(&rfds_all);
727
571
728
/* Read and execute any executable in the plugin directory*/
729
572
while(true){
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
573
dirst = readdir(dir);
733
574
734
/* All directory entries have been processed */
575
// All directory entries have been processed
735
576
if(dirst == NULL){
736
if(errno == EBADF){
577
if (errno == EBADF){
737
578
perror("readdir");
738
579
exitstatus = EXIT_FAILURE;
739
580
goto fallback;
743
584
744
585
d_name_len = strlen(dirst->d_name);
745
586
746
/* Ignore dotfiles, backup files and other junk */
587
// Ignore dotfiles, backup files and other junk
747
588
{
748
589
bool bad_name = false;
749
590
751
592
752
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
753
594
".dpkg-old",
754
".dpkg-bak",
755
595
".dpkg-divert", NULL };
756
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
757
597
size_t pre_len = strlen(*pre);
765
605
break;
766
606
}
767
607
}
608
768
609
if(bad_name){
769
610
continue;
770
611
}
612
771
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
772
614
size_t suf_len = strlen(*suf);
773
615
if((d_name_len >= suf_len)
786
628
continue;
787
629
}
788
630
}
789
631
790
632
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
}
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
799
634
if(ret < 0){
800
635
perror("asprintf");
801
636
continue;
802
637
}
803
638
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
639
ret = stat(filename, &st);
640
if (ret == -1){
806
641
perror("stat");
807
642
free(filename);
808
643
continue;
809
644
}
810
645
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
814
647
if(debug){
815
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
649
" with bad type or mode\n", filename);
818
651
free(filename);
819
652
continue;
820
653
}
821
822
plugin *p = getplugin(dirst->d_name);
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
823
655
if(p == NULL){
824
656
perror("getplugin");
825
657
free(filename);
835
667
}
836
668
{
837
669
/* Add global arguments to argument list for this plugin */
838
plugin *g = getplugin(NULL);
670
plugin *g = getplugin(NULL, &plugin_list);
839
671
if(g != NULL){
840
672
for(char **a = g->argv + 1; *a != NULL; a++){
841
673
if(not add_argument(p, *a)){
844
676
}
845
677
/* Add global environment variables */
846
678
for(char **e = g->environ; *e != NULL; e++){
847
if(not add_environment(p, *e, false)){
679
if(not add_environment(p, *e)){
848
680
perror("add_environment");
849
681
}
850
682
}
855
687
process, too. */
856
688
if(p->environ[0] != NULL){
857
689
for(char **e = environ; *e != NULL; e++){
858
if(not add_environment(p, *e, false)){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
859
696
perror("add_environment");
860
697
}
861
698
}
862
699
}
863
700
864
701
int pipefd[2];
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
702
ret = pipe(pipefd);
703
if (ret == -1){
867
704
perror("pipe");
868
705
exitstatus = EXIT_FAILURE;
869
706
goto fallback;
870
707
}
871
/* Ask OS to automatic close the pipe on exec */
872
708
ret = set_cloexec_flag(pipefd[0]);
873
709
if(ret < 0){
874
710
perror("set_cloexec_flag");
882
718
goto fallback;
883
719
}
884
720
/* 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));
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
888
722
if(ret < 0){
889
723
perror("sigprocmask");
890
724
exitstatus = EXIT_FAILURE;
891
725
goto fallback;
892
726
}
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
727
// Starting a new process to be watched
728
pid_t pid = fork();
898
729
if(pid == -1){
899
730
perror("fork");
900
731
exitstatus = EXIT_FAILURE;
907
738
perror("sigaction");
908
739
_exit(EXIT_FAILURE);
909
740
}
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
742
if(ret < 0){
912
743
perror("sigprocmask");
913
744
_exit(EXIT_FAILURE);
914
745
}
915
746
916
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
917
748
if(ret == -1){
918
749
perror("dup2");
937
768
}
938
769
/* no return */
939
770
}
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
771
/* parent process */
943
772
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)));
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
950
778
if(ret < 0){
951
perror("sigprocmask");
779
perror("sigprocmask");
952
780
}
953
781
exitstatus = EXIT_FAILURE;
954
782
goto fallback;
955
783
}
956
784
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
960
790
/* Unblock SIGCHLD so signal handler can be run if this process
961
791
has already completed */
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
965
793
if(ret < 0){
966
794
perror("sigprocmask");
967
795
exitstatus = EXIT_FAILURE;
968
796
goto fallback;
969
797
}
970
798
971
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
972
-Wconversion */
799
FD_SET(new_process->fd, &rfds_all);
973
800
974
if(maxfd < new_plugin->fd){
975
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
976
803
}
804
977
805
}
978
806
979
TEMP_FAILURE_RETRY(closedir(dir));
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
980
811
dir = NULL;
981
free_plugin(getplugin(NULL));
982
983
for(plugin *p = plugin_list; p != NULL; p = p->next){
984
if(p->pid != 0){
985
break;
986
}
987
if(p->next == NULL){
988
fprintf(stderr, "No plugin processes started. Incorrect plugin"
989
" directory?\n");
990
free_plugin_list();
991
}
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
992
817
}
993
994
/* Main loop while running plugins exist */
995
while(plugin_list){
818
while(process_list){
996
819
fd_set rfds = rfds_all;
997
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
998
if(select_ret == -1 and errno != EINTR){
821
if (select_ret == -1){
999
822
perror("select");
1000
823
exitstatus = EXIT_FAILURE;
1001
824
goto fallback;
1002
825
}
1003
826
/* OK, now either a process completed, or something can be read
1004
827
from one of them */
1005
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
1006
829
/* Is this process completely done? */
1007
if(proc->completed and proc->eof){
830
if(proc->eof and proc->completed){
1008
831
/* Only accept the plugin output if it exited cleanly */
1009
832
if(not WIFEXITED(proc->status)
1010
833
or WEXITSTATUS(proc->status) != 0){
1011
834
/* Bad exit by plugin */
1012
1013
835
if(debug){
1014
836
if(WIFEXITED(proc->status)){
1015
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1016
" status %d\n", proc->name,
1017
(intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
1018
839
WEXITSTATUS(proc->status));
1019
} else if(WIFSIGNALED(proc->status)){
1020
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1021
" signal %d: %s\n", proc->name,
1022
(intmax_t) (proc->pid),
1023
WTERMSIG(proc->status),
1024
strsignal(WTERMSIG(proc->status)));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
1025
844
} else if(WCOREDUMP(proc->status)){
1026
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1027
" core\n", proc->name, (intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
1028
847
}
1029
848
}
1030
1031
849
/* Remove the plugin */
1032
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1033
-Wconversion */
1034
850
FD_CLR(proc->fd, &rfds_all);
1035
851
/* Block signal while modifying process_list */
1036
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1037
(SIG_BLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1040
853
if(ret < 0){
1041
854
perror("sigprocmask");
1042
855
exitstatus = EXIT_FAILURE;
1043
856
goto fallback;
1044
857
}
1045
1046
plugin *next_plugin = proc->next;
1047
free_plugin(proc);
1048
proc = next_plugin;
1049
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1050
871
/* We are done modifying process list, so unblock signal */
1051
ret = (int)(TEMP_FAILURE_RETRY
1052
(sigprocmask(SIG_UNBLOCK,
1053
&sigchld_action.sa_mask, NULL)));
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1054
874
if(ret < 0){
1055
875
perror("sigprocmask");
1056
exitstatus = EXIT_FAILURE;
1057
goto fallback;
1058
}
1059
1060
if(plugin_list == NULL){
1061
break;
1062
}
1063
1064
continue;
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1065
883
}
1066
1067
884
/* This process exited nicely, so print its buffer */
1068
885
1069
886
bool bret = print_out_password(proc->buffer,
1070
887
proc->buffer_length);
1071
888
if(not bret){
1074
891
}
1075
892
goto fallback;
1076
893
}
1077
1078
894
/* This process has not completed. Does it have any output? */
1079
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1080
warning from
1081
-Wconversion */
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1082
896
/* This process had nothing to say at this time */
1083
proc = proc->next;
1084
897
continue;
1085
898
}
1086
899
/* Before reading, make the process' data buffer large enough */
1087
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1088
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
1089
902
+ (size_t) BUFFER_SIZE);
1090
if(proc->buffer == NULL){
903
if (proc->buffer == NULL){
1091
904
perror("malloc");
1092
905
exitstatus = EXIT_FAILURE;
1093
906
goto fallback;
1095
908
proc->buffer_size += BUFFER_SIZE;
1096
909
}
1097
910
/* Read from the process */
1098
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1099
proc->buffer
1100
+ proc->buffer_length,
1101
BUFFER_SIZE));
1102
if(sret < 0){
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1103
914
/* Read error from this process; ignore the error */
1104
proc = proc->next;
1105
915
continue;
1106
916
}
1107
if(sret == 0){
917
if(ret == 0){
1108
918
/* got EOF */
1109
919
proc->eof = true;
1110
920
} else {
1111
proc->buffer_length += (size_t) sret;
921
proc->buffer_length += (size_t) ret;
1112
922
}
1113
923
}
1114
924
}
1115
1116
925
926
1117
927
fallback:
1118
928
1119
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1120
930
/* Fallback if all plugins failed, none are found or an error
1121
931
occured */
1122
932
bool bret;
1123
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1124
934
char *passwordbuffer = getpass("Password: ");
1125
size_t len = strlen(passwordbuffer);
1126
/* Strip trailing newline */
1127
if(len > 0 and passwordbuffer[len-1] == '\n'){
1128
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1129
len--;
1130
}
1131
bret = print_out_password(passwordbuffer, len);
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1132
936
if(not bret){
1133
937
perror("print_out_password");
1134
938
exitstatus = EXIT_FAILURE;
1141
945
perror("sigaction");
1142
946
exitstatus = EXIT_FAILURE;
1143
947
}
1144
948
1145
949
if(custom_argv != NULL){
1146
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1147
951
free(*arg);
1148
952
}
1149
953
free(custom_argv);
1150
954
}
955
free_plugin_list(plugin_list);
1151
956
1152
957
if(dir != NULL){
1153
958
closedir(dir);
1154
959
}
1155
960
1156
/* Kill the processes */
1157
for(plugin *p = plugin_list; p != NULL; p = p->next){
1158
if(p->pid != 0){
1159
close(p->fd);
1160
ret = kill(p->pid, SIGTERM);
1161
if(ret == -1 and errno != ESRCH){
1162
/* Set-uid proccesses might not get closed */
1163
perror("kill");
1164
}
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1165
969
}
970
free(process_list->buffer);
971
free(process_list);
1166
972
}
1167
973
1168
974
/* Wait for any remaining child processes to terminate */
1169
do {
975
do{
1170
976
ret = wait(NULL);
1171
977
} while(ret >= 0);
1172
978
if(errno != ECHILD){
1173
979
perror("wait");
1174
980
}
1175
981
1176
free_plugin_list();
1177
1178
free(plugindir);
1179
free(argfile);
1180
1181
982
return exitstatus;
1182
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0