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- Committer: Teddy Hogeborn
- Date: 2008-08-24 09:40:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080824094058-bdqng3t1e3hfnk2e
* plugin-runner.c (getplugin): Only copy "name" if not NULL. Free
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
- 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 a process 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;
248
while(true){
249
plugin *proc = plugin_list;
250
int status;
251
pid_t pid = waitpid(-1, &status, WNOHANG);
252
if(pid == 0){
253
/* Only still running child processes */
254
break;
255
}
256
if(pid == -1){
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
260
}
261
perror("waitpid");
262
}
263
264
/* A child exited, find it in process_list */
265
while(proc != NULL and proc->pid != pid){
266
proc = proc->next;
267
}
268
if(proc == NULL){
269
/* Process not found in process list */
270
continue;
271
}
272
proc->status = status;
273
proc->completed = 1;
274
}
275
errno = old_errno;
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
276
221
}
277
222
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
223
bool print_out_password(const char *buffer, size_t length){
280
224
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
281
228
for(size_t written = 0; written < length; written += (size_t)ret){
282
229
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
283
230
length - written));
288
235
return true;
289
236
}
290
237
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
}
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
315
244
}
316
}
317
318
free(plugin_node);
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
319
257
}
320
258
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
324
271
}
325
272
}
326
273
327
274
int main(int argc, char *argv[]){
328
char *plugindir = NULL;
329
char *argfile = NULL;
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
330
277
FILE *conffp;
331
278
size_t d_name_len;
332
279
DIR *dir = NULL;
334
281
struct stat st;
335
282
fd_set rfds_all;
336
283
int ret, maxfd = 0;
337
ssize_t sret;
338
284
uid_t uid = 65534;
339
285
gid_t gid = 65534;
340
286
bool debug = false;
365
311
{ .name = "global-options", .key = 'g',
366
312
.arg = "OPTION[,OPTION[,...]]",
367
313
.doc = "Options passed to all plugins" },
368
{ .name = "global-env", .key = 'G',
314
{ .name = "global-envs", .key = 'e',
369
315
.arg = "VAR=value",
370
316
.doc = "Environment variable passed to all plugins" },
371
317
{ .name = "options-for", .key = 'o',
372
318
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
373
319
.doc = "Options passed only to specified plugin" },
374
{ .name = "env-for", .key = 'E',
320
{ .name = "envs-for", .key = 'f',
375
321
.arg = "PLUGIN:ENV=value",
376
322
.doc = "Environment variable passed to specified plugin" },
377
323
{ .name = "disable", .key = 'd',
378
324
.arg = "PLUGIN",
379
325
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
383
326
{ .name = "plugin-dir", .key = 128,
384
327
.arg = "DIRECTORY",
385
328
.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 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
397
337
{ .name = NULL }
398
338
};
399
339
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'){
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
344
switch (key) {
345
case 'g':
346
if (arg != NULL){
347
char *p;
348
while((p = strsep(&arg, ",")) != NULL){
349
if(p[0] == '\0'){
410
350
continue;
411
351
}
412
if(not add_argument(getplugin(NULL), plugin_option)){
352
if(not add_argument(getplugin(NULL, plugins), p)){
413
353
perror("add_argument");
414
354
return ARGP_ERR_UNKNOWN;
415
355
}
416
356
}
417
357
}
418
358
break;
419
case 'G': /* --global-env */
359
case 'e':
420
360
if(arg == NULL){
421
361
break;
422
362
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
425
371
}
426
372
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;
373
case 'o':
374
if (arg != NULL){
375
char *p_name = strsep(&arg, ":");
376
if(p_name[0] == '\0'){
377
break;
378
}
379
char *opt = strsep(&arg, ":");
380
if(opt[0] == '\0'){
381
break;
382
}
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
438
393
}
439
394
}
440
395
}
441
396
break;
442
case 'E': /* --env-for */
397
case 'f':
443
398
if(arg == NULL){
444
399
break;
445
400
}
448
403
if(envdef == NULL){
449
404
break;
450
405
}
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
453
412
perror("add_environment");
454
413
}
455
414
}
456
415
break;
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
416
case 'd':
417
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
460
419
if(p == NULL){
461
420
return ARGP_ERR_UNKNOWN;
462
421
}
463
422
p->disabled = true;
464
423
}
465
424
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 */
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
429
uid = (uid_t)strtol(arg, NULL, 10);
430
break;
431
case 130:
432
gid = (gid_t)strtol(arg, NULL, 10);
433
break;
434
case 131:
508
435
debug = true;
509
436
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 = "",
437
case ARGP_KEY_ARG:
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
452
.doc = "Mandos plugin runner -- Run plugins" };
567
453
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){
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
455
if (ret == ARGP_ERR_UNKNOWN){
572
456
fprintf(stderr, "Unknown error while parsing arguments\n");
573
457
exitstatus = EXIT_FAILURE;
574
458
goto fallback;
575
459
}
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
}
460
461
conffp = fopen(argfile, "r");
586
462
if(conffp != NULL){
587
463
char *org_line = NULL;
588
464
char *p, *arg, *new_arg, *line;
589
465
size_t size = 0;
466
ssize_t sret;
590
467
const char whitespace_delims[] = " \r\t\f\v\n";
591
468
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 */
469
605
470
while(true){
606
471
sret = getline(&org_line, &size, conffp);
607
472
if(sret == -1){
608
473
break;
609
474
}
610
475
611
476
line = org_line;
612
477
arg = strsep(&line, comment_delim);
613
478
while((p = strsep(&arg, whitespace_delims)) != NULL){
615
480
continue;
616
481
}
617
482
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;
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
636
489
}
637
490
}
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
491
free(org_line);
647
} else {
492
} else{
648
493
/* Check for harmful errors and go to fallback. Other errors might
649
494
not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
496
perror("fopen");
652
497
exitstatus = EXIT_FAILURE;
653
498
goto fallback;
654
499
}
655
500
}
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
501
658
502
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){
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
505
if (ret == ARGP_ERR_UNKNOWN){
662
506
fprintf(stderr, "Unknown error while parsing arguments\n");
663
507
exitstatus = EXIT_FAILURE;
664
508
goto fallback;
665
509
}
666
510
}
667
511
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
512
if(debug){
678
513
for(plugin *p = plugin_list; p != NULL; p=p->next){
679
514
fprintf(stderr, "Plugin: %s has %d arguments\n",
681
516
for(char **a = p->argv; *a != NULL; a++){
682
517
fprintf(stderr, "\tArg: %s\n", *a);
683
518
}
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
519
fprintf(stderr, "...and %u environment variables\n", p->envc);
685
520
for(char **a = p->environ; *a != NULL; a++){
686
521
fprintf(stderr, "\t%s\n", *a);
687
522
}
688
523
}
689
524
}
690
525
691
/* Strip permissions down to nobody */
526
ret = setuid(uid);
527
if (ret == -1){
528
perror("setuid");
529
}
530
692
531
setgid(gid);
693
if(ret == -1){
532
if (ret == -1){
694
533
perror("setgid");
695
534
}
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
535
536
dir = opendir(plugindir);
707
537
if(dir == NULL){
708
538
perror("Could not open plugin dir");
709
539
exitstatus = EXIT_FAILURE;
725
555
726
556
FD_ZERO(&rfds_all);
727
557
728
/* Read and execute any executable in the plugin directory*/
729
558
while(true){
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
559
dirst = readdir(dir);
733
560
734
/* All directory entries have been processed */
561
// All directory entries have been processed
735
562
if(dirst == NULL){
736
if(errno == EBADF){
563
if (errno == EBADF){
737
564
perror("readdir");
738
565
exitstatus = EXIT_FAILURE;
739
566
goto fallback;
743
570
744
571
d_name_len = strlen(dirst->d_name);
745
572
746
/* Ignore dotfiles, backup files and other junk */
573
// Ignore dotfiles, backup files and other junk
747
574
{
748
575
bool bad_name = false;
749
576
751
578
752
579
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
753
580
".dpkg-old",
754
".dpkg-bak",
755
581
".dpkg-divert", NULL };
756
582
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
757
583
size_t pre_len = strlen(*pre);
765
591
break;
766
592
}
767
593
}
594
768
595
if(bad_name){
769
596
continue;
770
597
}
598
771
599
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
772
600
size_t suf_len = strlen(*suf);
773
601
if((d_name_len >= suf_len)
786
614
continue;
787
615
}
788
616
}
789
617
790
618
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
}
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
799
620
if(ret < 0){
800
621
perror("asprintf");
801
622
continue;
802
623
}
803
624
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
625
ret = stat(filename, &st);
626
if (ret == -1){
806
627
perror("stat");
807
628
free(filename);
808
629
continue;
809
630
}
810
631
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
814
633
if(debug){
815
634
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
635
" with bad type or mode\n", filename);
818
637
free(filename);
819
638
continue;
820
639
}
821
822
plugin *p = getplugin(dirst->d_name);
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
823
641
if(p == NULL){
824
642
perror("getplugin");
825
643
free(filename);
835
653
}
836
654
{
837
655
/* Add global arguments to argument list for this plugin */
838
plugin *g = getplugin(NULL);
656
plugin *g = getplugin(NULL, &plugin_list);
839
657
if(g != NULL){
840
658
for(char **a = g->argv + 1; *a != NULL; a++){
841
659
if(not add_argument(p, *a)){
844
662
}
845
663
/* Add global environment variables */
846
664
for(char **e = g->environ; *e != NULL; e++){
847
if(not add_environment(p, *e, false)){
665
if(not add_environment(p, *e)){
848
666
perror("add_environment");
849
667
}
850
668
}
855
673
process, too. */
856
674
if(p->environ[0] != NULL){
857
675
for(char **e = environ; *e != NULL; e++){
858
if(not add_environment(p, *e, false)){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
859
682
perror("add_environment");
860
683
}
861
684
}
862
685
}
863
686
864
687
int pipefd[2];
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
688
ret = pipe(pipefd);
689
if (ret == -1){
867
690
perror("pipe");
868
691
exitstatus = EXIT_FAILURE;
869
692
goto fallback;
870
693
}
871
/* Ask OS to automatic close the pipe on exec */
872
694
ret = set_cloexec_flag(pipefd[0]);
873
695
if(ret < 0){
874
696
perror("set_cloexec_flag");
882
704
goto fallback;
883
705
}
884
706
/* 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));
707
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
888
708
if(ret < 0){
889
709
perror("sigprocmask");
890
710
exitstatus = EXIT_FAILURE;
891
711
goto fallback;
892
712
}
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
713
// Starting a new process to be watched
714
pid_t pid = fork();
898
715
if(pid == -1){
899
716
perror("fork");
900
717
exitstatus = EXIT_FAILURE;
907
724
perror("sigaction");
908
725
_exit(EXIT_FAILURE);
909
726
}
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
728
if(ret < 0){
912
729
perror("sigprocmask");
913
730
_exit(EXIT_FAILURE);
914
731
}
915
732
916
733
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
917
734
if(ret == -1){
918
735
perror("dup2");
937
754
}
938
755
/* no return */
939
756
}
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
757
/* parent process */
943
758
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)));
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
950
764
if(ret < 0){
951
perror("sigprocmask");
765
perror("sigprocmask");
952
766
}
953
767
exitstatus = EXIT_FAILURE;
954
768
goto fallback;
955
769
}
956
770
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
960
776
/* Unblock SIGCHLD so signal handler can be run if this process
961
777
has already completed */
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
965
779
if(ret < 0){
966
780
perror("sigprocmask");
967
781
exitstatus = EXIT_FAILURE;
968
782
goto fallback;
969
783
}
970
784
971
FD_SET(new_plugin->fd, &rfds_all);
785
FD_SET(new_process->fd, &rfds_all);
972
786
973
if(maxfd < new_plugin->fd){
974
maxfd = new_plugin->fd;
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
975
789
}
790
976
791
}
977
792
978
TEMP_FAILURE_RETRY(closedir(dir));
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
796
closedir(dir);
979
797
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
}
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
991
803
}
992
993
/* Main loop while running plugins exist */
994
while(plugin_list){
804
while(process_list){
995
805
fd_set rfds = rfds_all;
996
806
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
997
if(select_ret == -1 and errno != EINTR){
807
if (select_ret == -1){
998
808
perror("select");
999
809
exitstatus = EXIT_FAILURE;
1000
810
goto fallback;
1001
811
}
1002
812
/* OK, now either a process completed, or something can be read
1003
813
from one of them */
1004
for(plugin *proc = plugin_list; proc != NULL;){
814
for(process *proc = process_list; proc ; proc = proc->next){
1005
815
/* Is this process completely done? */
1006
if(proc->completed and proc->eof){
816
if(proc->eof and proc->completed){
1007
817
/* Only accept the plugin output if it exited cleanly */
1008
818
if(not WIFEXITED(proc->status)
1009
819
or WEXITSTATUS(proc->status) != 0){
1010
820
/* Bad exit by plugin */
1011
1012
821
if(debug){
1013
822
if(WIFEXITED(proc->status)){
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
1017
825
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)));
826
} else if(WIFSIGNALED(proc->status)) {
827
fprintf(stderr, "Plugin %u killed by signal %d\n",
828
(unsigned int) (proc->pid),
829
WTERMSIG(proc->status));
1024
830
} else if(WCOREDUMP(proc->status)){
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
1027
833
}
1028
834
}
1029
1030
835
/* Remove the plugin */
1031
836
FD_CLR(proc->fd, &rfds_all);
1032
1033
837
/* Block signal while modifying process_list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1038
839
if(ret < 0){
1039
840
perror("sigprocmask");
1040
841
exitstatus = EXIT_FAILURE;
1041
842
goto fallback;
1042
843
}
1043
1044
plugin *next_plugin = proc->next;
1045
free_plugin(proc);
1046
proc = next_plugin;
1047
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
1048
857
/* 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)));
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1052
860
if(ret < 0){
1053
861
perror("sigprocmask");
1054
exitstatus = EXIT_FAILURE;
1055
goto fallback;
1056
}
1057
1058
if(plugin_list == NULL){
1059
break;
1060
}
1061
1062
continue;
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
1063
869
}
1064
1065
870
/* This process exited nicely, so print its buffer */
1066
1067
bool bret = print_out_password(proc->buffer,
1068
proc->buffer_length);
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1069
873
if(not bret){
1070
874
perror("print_out_password");
1071
875
exitstatus = EXIT_FAILURE;
1072
876
}
1073
877
goto fallback;
1074
878
}
1075
1076
879
/* This process has not completed. Does it have any output? */
1077
880
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1078
881
/* This process had nothing to say at this time */
1079
proc = proc->next;
1080
882
continue;
1081
883
}
1082
884
/* Before reading, make the process' data buffer large enough */
1083
885
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1084
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
1085
887
+ (size_t) BUFFER_SIZE);
1086
if(proc->buffer == NULL){
888
if (proc->buffer == NULL){
1087
889
perror("malloc");
1088
890
exitstatus = EXIT_FAILURE;
1089
891
goto fallback;
1091
893
proc->buffer_size += BUFFER_SIZE;
1092
894
}
1093
895
/* 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){
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1099
899
/* Read error from this process; ignore the error */
1100
proc = proc->next;
1101
900
continue;
1102
901
}
1103
if(sret == 0){
902
if(ret == 0){
1104
903
/* got EOF */
1105
904
proc->eof = true;
1106
905
} else {
1107
proc->buffer_length += (size_t) sret;
906
proc->buffer_length += (size_t) ret;
1108
907
}
1109
908
}
1110
909
}
1111
1112
910
911
1113
912
fallback:
1114
913
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1116
/* Fallback if all plugins failed, none are found or an error
1117
occured */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1118
916
bool bret;
1119
917
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1120
918
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);
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1128
920
if(not bret){
1129
921
perror("print_out_password");
1130
922
exitstatus = EXIT_FAILURE;
1137
929
perror("sigaction");
1138
930
exitstatus = EXIT_FAILURE;
1139
931
}
1140
932
1141
933
if(custom_argv != NULL){
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1143
935
free(*arg);
1144
936
}
1145
937
free(custom_argv);
1146
938
}
939
free_plugin_list(plugin_list);
1147
940
1148
941
if(dir != NULL){
1149
942
closedir(dir);
1150
943
}
1151
944
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
}
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1161
953
}
954
free(process_list->buffer);
955
free(process_list);
1162
956
}
1163
957
1164
958
/* Wait for any remaining child processes to terminate */
1165
do {
959
do{
1166
960
ret = wait(NULL);
1167
961
} while(ret >= 0);
1168
962
if(errno != ECHILD){
1169
963
perror("wait");
1170
964
}
1171
965
1172
free_plugin_list();
1173
1174
free(plugindir);
1175
free(argfile);
1176
1177
966
return exitstatus;
1178
967
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0