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- Committer: teddy at bsnet
- Date: 2010-08-11 20:06:18 UTC
- mto: This revision was merged to the branch mainline in revision 419.
- Revision ID: teddy@fukt.bsnet.se-20100811200618-1uuv7p6cmrb2cmxu
* plugins.d/mandos-client.c: Added debug output.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
58
61
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
60
64
#include <signal.h> /* struct sigaction, sigemptyset(),
61
65
sigaddset(), sigaction(),
62
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
65
71
66
72
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
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;
70
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
79
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
86
80
typedef struct plugin{
87
81
char *name; /* can be NULL or any plugin name */
88
82
char **argv;
90
84
char **environ;
91
85
int envc;
92
86
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;
93
97
struct plugin *next;
94
98
} plugin;
95
99
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))){
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))){
100
109
return p;
101
110
}
102
111
}
103
112
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
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){
106
118
return NULL;
107
119
}
108
120
char *copy_name = NULL;
109
121
if(name != NULL){
110
copy_name = strdup(name);
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
111
125
if(copy_name == NULL){
126
free(new_plugin);
112
127
return NULL;
113
128
}
114
129
}
115
130
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
121
135
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
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){
124
140
free(copy_name);
125
141
free(new_plugin);
126
142
return NULL;
127
143
}
128
144
new_plugin->argv[0] = copy_name;
129
145
new_plugin->argv[1] = NULL;
130
131
new_plugin->environ = malloc(sizeof(char *));
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
132
150
if(new_plugin->environ == NULL){
133
151
free(copy_name);
134
152
free(new_plugin->argv);
136
154
return NULL;
137
155
}
138
156
new_plugin->environ[0] = NULL;
157
139
158
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
159
plugin_list = new_plugin;
141
160
return new_plugin;
142
161
}
143
162
145
164
static bool add_to_char_array(const char *new, char ***array,
146
165
int *len){
147
166
/* Resize the pointed-to array to hold one more pointer */
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
150
171
/* Malloc check */
151
172
if(*array == NULL){
152
173
return false;
153
174
}
154
175
/* Make a copy of the new string */
155
char *copy = strdup(new);
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
156
180
if(copy == NULL){
157
181
return false;
158
182
}
173
197
}
174
198
175
199
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
200
static bool add_environment(plugin *p, const char *def, bool replace){
177
201
if(p == NULL){
178
202
return false;
179
203
}
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
}
180
224
return add_to_char_array(def, &(p->environ), &(p->envc));
181
225
}
182
226
183
184
227
/*
185
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
229
* Descriptor Flags".
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
231
*/
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
234
/* If reading the flags failed, return error indication now. */
193
235
if(ret < 0){
194
236
return ret;
195
237
}
196
238
/* Store modified flag word in the descriptor. */
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
198
241
}
199
242
200
process *process_list = NULL;
201
243
202
/* Mark a process as completed when it exits, and save its exit
244
/* Mark processes as completed when they exit, and save their exit
203
245
status. */
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;
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;
221
276
}
222
277
223
bool print_out_password(const char *buffer, size_t length){
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
224
280
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
228
281
for(size_t written = 0; written < length; written += (size_t)ret){
229
282
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
283
length - written));
235
288
return true;
236
289
}
237
290
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;
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
}
244
315
}
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;
316
}
317
318
free(plugin_node);
257
319
}
258
320
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);
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
271
324
}
272
325
}
273
326
274
327
int main(int argc, char *argv[]){
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
328
char *plugindir = NULL;
329
char *argfile = NULL;
277
330
FILE *conffp;
278
331
size_t d_name_len;
279
332
DIR *dir = NULL;
281
334
struct stat st;
282
335
fd_set rfds_all;
283
336
int ret, maxfd = 0;
337
ssize_t sret;
284
338
uid_t uid = 65534;
285
339
gid_t gid = 65534;
286
340
bool debug = false;
311
365
{ .name = "global-options", .key = 'g',
312
366
.arg = "OPTION[,OPTION[,...]]",
313
367
.doc = "Options passed to all plugins" },
314
{ .name = "global-envs", .key = 'e',
368
{ .name = "global-env", .key = 'G',
315
369
.arg = "VAR=value",
316
370
.doc = "Environment variable passed to all plugins" },
317
371
{ .name = "options-for", .key = 'o',
318
372
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
319
373
.doc = "Options passed only to specified plugin" },
320
{ .name = "envs-for", .key = 'f',
374
{ .name = "env-for", .key = 'E',
321
375
.arg = "PLUGIN:ENV=value",
322
376
.doc = "Environment variable passed to specified plugin" },
323
377
{ .name = "disable", .key = 'd',
324
378
.arg = "PLUGIN",
325
379
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
326
383
{ .name = "plugin-dir", .key = 128,
327
384
.arg = "DIRECTORY",
328
385
.doc = "Specify a different plugin directory", .group = 2 },
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 },
386
{ .name = "config-file", .key = 129,
387
.arg = "FILE",
388
.doc = "Specify a different configuration file", .group = 2 },
389
{ .name = "userid", .key = 130,
390
.arg = "ID", .flags = 0,
391
.doc = "User ID the plugins will run as", .group = 3 },
392
{ .name = "groupid", .key = 131,
393
.arg = "ID", .flags = 0,
394
.doc = "Group ID the plugins will run as", .group = 3 },
395
{ .name = "debug", .key = 132,
396
.doc = "Debug mode", .group = 4 },
337
397
{ .name = NULL }
338
398
};
339
399
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'){
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'){
350
410
continue;
351
411
}
352
if(not add_argument(getplugin(NULL, plugins), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
353
413
perror("add_argument");
354
414
return ARGP_ERR_UNKNOWN;
355
415
}
356
416
}
357
417
}
358
418
break;
359
case 'e':
419
case 'G': /* --global-env */
360
420
if(arg == NULL){
361
421
break;
362
422
}
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
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
371
425
}
372
426
break;
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
}
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;
393
438
}
394
439
}
395
440
}
396
441
break;
397
case 'f':
442
case 'E': /* --env-for */
398
443
if(arg == NULL){
399
444
break;
400
445
}
403
448
if(envdef == NULL){
404
449
break;
405
450
}
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)){
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
412
453
perror("add_environment");
413
454
}
414
455
}
415
456
break;
416
case 'd':
417
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
419
460
if(p == NULL){
420
461
return ARGP_ERR_UNKNOWN;
421
462
}
422
463
p->disabled = true;
423
464
}
424
465
break;
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:
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 */
435
508
debug = true;
436
509
break;
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]",
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 = "",
452
566
.doc = "Mandos plugin runner -- Run plugins" };
453
567
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
455
if (ret == ARGP_ERR_UNKNOWN){
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){
456
572
fprintf(stderr, "Unknown error while parsing arguments\n");
457
573
exitstatus = EXIT_FAILURE;
458
574
goto fallback;
459
575
}
460
461
conffp = fopen(argfile, "r");
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
}
462
586
if(conffp != NULL){
463
587
char *org_line = NULL;
464
588
char *p, *arg, *new_arg, *line;
465
589
size_t size = 0;
466
ssize_t sret;
467
590
const char whitespace_delims[] = " \r\t\f\v\n";
468
591
const char comment_delim[] = "#";
469
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 */
470
605
while(true){
471
606
sret = getline(&org_line, &size, conffp);
472
607
if(sret == -1){
473
608
break;
474
609
}
475
610
476
611
line = org_line;
477
612
arg = strsep(&line, comment_delim);
478
613
while((p = strsep(&arg, whitespace_delims)) != NULL){
480
615
continue;
481
616
}
482
617
new_arg = strdup(p);
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
}
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;
489
636
}
490
637
}
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
}
491
646
free(org_line);
492
} else{
647
} else {
493
648
/* Check for harmful errors and go to fallback. Other errors might
494
649
not affect opening plugins */
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
496
651
perror("fopen");
497
652
exitstatus = EXIT_FAILURE;
498
653
goto fallback;
499
654
}
500
655
}
501
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
502
658
if(custom_argv != NULL){
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){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
506
662
fprintf(stderr, "Unknown error while parsing arguments\n");
507
663
exitstatus = EXIT_FAILURE;
508
664
goto fallback;
509
665
}
510
666
}
511
667
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
512
677
if(debug){
513
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
514
679
fprintf(stderr, "Plugin: %s has %d arguments\n",
516
681
for(char **a = p->argv; *a != NULL; a++){
517
682
fprintf(stderr, "\tArg: %s\n", *a);
518
683
}
519
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
520
685
for(char **a = p->environ; *a != NULL; a++){
521
686
fprintf(stderr, "\t%s\n", *a);
522
687
}
523
688
}
524
689
}
525
690
691
/* Strip permissions down to nobody */
692
setgid(gid);
693
if(ret == -1){
694
perror("setgid");
695
}
526
696
ret = setuid(uid);
527
if (ret == -1){
697
if(ret == -1){
528
698
perror("setuid");
529
699
}
530
700
531
setgid(gid);
532
if (ret == -1){
533
perror("setgid");
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
534
705
}
535
706
536
dir = opendir(plugindir);
537
707
if(dir == NULL){
538
708
perror("Could not open plugin dir");
539
709
exitstatus = EXIT_FAILURE;
555
725
556
726
FD_ZERO(&rfds_all);
557
727
728
/* Read and execute any executable in the plugin directory*/
558
729
while(true){
559
dirst = readdir(dir);
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
560
733
561
// All directory entries have been processed
734
/* All directory entries have been processed */
562
735
if(dirst == NULL){
563
if (errno == EBADF){
736
if(errno == EBADF){
564
737
perror("readdir");
565
738
exitstatus = EXIT_FAILURE;
566
739
goto fallback;
570
743
571
744
d_name_len = strlen(dirst->d_name);
572
745
573
// Ignore dotfiles, backup files and other junk
746
/* Ignore dotfiles, backup files and other junk */
574
747
{
575
748
bool bad_name = false;
576
749
578
751
579
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
580
753
".dpkg-old",
754
".dpkg-bak",
581
755
".dpkg-divert", NULL };
582
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
583
757
size_t pre_len = strlen(*pre);
591
765
break;
592
766
}
593
767
}
594
595
768
if(bad_name){
596
769
continue;
597
770
}
598
599
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
600
772
size_t suf_len = strlen(*suf);
601
773
if((d_name_len >= suf_len)
614
786
continue;
615
787
}
616
788
}
617
789
618
790
char *filename;
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
620
799
if(ret < 0){
621
800
perror("asprintf");
622
801
continue;
623
802
}
624
803
625
ret = stat(filename, &st);
626
if (ret == -1){
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
627
806
perror("stat");
628
807
free(filename);
629
808
continue;
630
809
}
631
810
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
633
814
if(debug){
634
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
635
816
" with bad type or mode\n", filename);
637
818
free(filename);
638
819
continue;
639
820
}
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
821
822
plugin *p = getplugin(dirst->d_name);
641
823
if(p == NULL){
642
824
perror("getplugin");
643
825
free(filename);
653
835
}
654
836
{
655
837
/* Add global arguments to argument list for this plugin */
656
plugin *g = getplugin(NULL, &plugin_list);
838
plugin *g = getplugin(NULL);
657
839
if(g != NULL){
658
840
for(char **a = g->argv + 1; *a != NULL; a++){
659
841
if(not add_argument(p, *a)){
662
844
}
663
845
/* Add global environment variables */
664
846
for(char **e = g->environ; *e != NULL; e++){
665
if(not add_environment(p, *e)){
847
if(not add_environment(p, *e, false)){
666
848
perror("add_environment");
667
849
}
668
850
}
673
855
process, too. */
674
856
if(p->environ[0] != NULL){
675
857
for(char **e = environ; *e != NULL; e++){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
858
if(not add_environment(p, *e, false)){
682
859
perror("add_environment");
683
860
}
684
861
}
685
862
}
686
863
687
864
int pipefd[2];
688
ret = pipe(pipefd);
689
if (ret == -1){
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
690
867
perror("pipe");
691
868
exitstatus = EXIT_FAILURE;
692
869
goto fallback;
693
870
}
871
/* Ask OS to automatic close the pipe on exec */
694
872
ret = set_cloexec_flag(pipefd[0]);
695
873
if(ret < 0){
696
874
perror("set_cloexec_flag");
704
882
goto fallback;
705
883
}
706
884
/* Block SIGCHLD until process is safely in process list */
707
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
708
888
if(ret < 0){
709
889
perror("sigprocmask");
710
890
exitstatus = EXIT_FAILURE;
711
891
goto fallback;
712
892
}
713
// Starting a new process to be watched
714
pid_t pid = fork();
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
715
898
if(pid == -1){
716
899
perror("fork");
717
900
exitstatus = EXIT_FAILURE;
724
907
perror("sigaction");
725
908
_exit(EXIT_FAILURE);
726
909
}
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
728
911
if(ret < 0){
729
912
perror("sigprocmask");
730
913
_exit(EXIT_FAILURE);
731
914
}
732
915
733
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
734
917
if(ret == -1){
735
918
perror("dup2");
754
937
}
755
938
/* no return */
756
939
}
757
/* parent process */
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
758
943
free(filename);
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);
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)));
764
950
if(ret < 0){
765
perror("sigprocmask");
951
perror("sigprocmask");
766
952
}
767
953
exitstatus = EXIT_FAILURE;
768
954
goto fallback;
769
955
}
770
956
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
776
960
/* Unblock SIGCHLD so signal handler can be run if this process
777
961
has already completed */
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
779
965
if(ret < 0){
780
966
perror("sigprocmask");
781
967
exitstatus = EXIT_FAILURE;
782
968
goto fallback;
783
969
}
784
970
785
FD_SET(new_process->fd, &rfds_all);
971
FD_SET(new_plugin->fd, &rfds_all);
786
972
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
973
if(maxfd < new_plugin->fd){
974
maxfd = new_plugin->fd;
789
975
}
790
791
976
}
792
977
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
796
closedir(dir);
978
TEMP_FAILURE_RETRY(closedir(dir));
797
979
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = 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
}
803
991
}
804
while(process_list){
992
993
/* Main loop while running plugins exist */
994
while(plugin_list){
805
995
fd_set rfds = rfds_all;
806
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
if (select_ret == -1){
997
if(select_ret == -1 and errno != EINTR){
808
998
perror("select");
809
999
exitstatus = EXIT_FAILURE;
810
1000
goto fallback;
811
1001
}
812
1002
/* OK, now either a process completed, or something can be read
813
1003
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
1004
for(plugin *proc = plugin_list; proc != NULL;){
815
1005
/* Is this process completely done? */
816
if(proc->eof and proc->completed){
1006
if(proc->completed and proc->eof){
817
1007
/* Only accept the plugin output if it exited cleanly */
818
1008
if(not WIFEXITED(proc->status)
819
1009
or WEXITSTATUS(proc->status) != 0){
820
1010
/* Bad exit by plugin */
1011
821
1012
if(debug){
822
1013
if(WIFEXITED(proc->status)){
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
825
1017
WEXITSTATUS(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));
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)));
830
1024
} else if(WCOREDUMP(proc->status)){
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
833
1027
}
834
1028
}
1029
835
1030
/* Remove the plugin */
836
1031
FD_CLR(proc->fd, &rfds_all);
1032
837
1033
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
839
1038
if(ret < 0){
840
1039
perror("sigprocmask");
841
1040
exitstatus = EXIT_FAILURE;
842
1041
goto fallback;
843
1042
}
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
}
1043
1044
plugin *next_plugin = proc->next;
1045
free_plugin(proc);
1046
proc = next_plugin;
1047
857
1048
/* We are done modifying process list, so unblock signal */
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
860
1052
if(ret < 0){
861
1053
perror("sigprocmask");
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;
1054
exitstatus = EXIT_FAILURE;
1055
goto fallback;
1056
}
1057
1058
if(plugin_list == NULL){
1059
break;
1060
}
1061
1062
continue;
869
1063
}
1064
870
1065
/* This process exited nicely, so print its buffer */
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1066
1067
bool bret = print_out_password(proc->buffer,
1068
proc->buffer_length);
873
1069
if(not bret){
874
1070
perror("print_out_password");
875
1071
exitstatus = EXIT_FAILURE;
876
1072
}
877
1073
goto fallback;
878
1074
}
1075
879
1076
/* This process has not completed. Does it have any output? */
880
1077
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1078
/* This process had nothing to say at this time */
1079
proc = proc->next;
882
1080
continue;
883
1081
}
884
1082
/* Before reading, make the process' data buffer large enough */
885
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
886
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
887
1085
+ (size_t) BUFFER_SIZE);
888
if (proc->buffer == NULL){
1086
if(proc->buffer == NULL){
889
1087
perror("malloc");
890
1088
exitstatus = EXIT_FAILURE;
891
1089
goto fallback;
893
1091
proc->buffer_size += BUFFER_SIZE;
894
1092
}
895
1093
/* Read from the process */
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1095
proc->buffer
1096
+ proc->buffer_length,
1097
BUFFER_SIZE));
1098
if(sret < 0){
899
1099
/* Read error from this process; ignore the error */
1100
proc = proc->next;
900
1101
continue;
901
1102
}
902
if(ret == 0){
1103
if(sret == 0){
903
1104
/* got EOF */
904
1105
proc->eof = true;
905
1106
} else {
906
proc->buffer_length += (size_t) ret;
1107
proc->buffer_length += (size_t) sret;
907
1108
}
908
1109
}
909
1110
}
910
911
1111
1112
912
1113
fallback:
913
1114
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1116
/* Fallback if all plugins failed, none are found or an error
1117
occured */
916
1118
bool bret;
917
1119
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1120
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
920
1128
if(not bret){
921
1129
perror("print_out_password");
922
1130
exitstatus = EXIT_FAILURE;
929
1137
perror("sigaction");
930
1138
exitstatus = EXIT_FAILURE;
931
1139
}
932
1140
933
1141
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1143
free(*arg);
936
1144
}
937
1145
free(custom_argv);
938
1146
}
939
free_plugin_list(plugin_list);
940
1147
941
1148
if(dir != NULL){
942
1149
closedir(dir);
943
1150
}
944
1151
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");
1152
/* Kill the processes */
1153
for(plugin *p = plugin_list; p != NULL; p = p->next){
1154
if(p->pid != 0){
1155
close(p->fd);
1156
ret = kill(p->pid, SIGTERM);
1157
if(ret == -1 and errno != ESRCH){
1158
/* Set-uid proccesses might not get closed */
1159
perror("kill");
1160
}
953
1161
}
954
free(process_list->buffer);
955
free(process_list);
956
1162
}
957
1163
958
1164
/* Wait for any remaining child processes to terminate */
959
do{
1165
do {
960
1166
ret = wait(NULL);
961
1167
} while(ret >= 0);
962
1168
if(errno != ECHILD){
963
1169
perror("wait");
964
1170
}
965
1171
1172
free_plugin_list();
1173
1174
free(plugindir);
1175
free(argfile);
1176
966
1177
return exitstatus;
967
1178
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0