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- Committer: Björn Påhlsson
- Date: 2008-08-09 12:43:14 UTC
- mfrom: (53 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 54.
- Revision ID: belorn@braxen-20080809124314-nsbmgfi715n4pz0a
merge
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
mandos-client.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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 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
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
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
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execve(), write(), read(),
49
dup2, STDOUT_FILENO, _exit(),
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(), strcmp(), strncmp() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
61
59
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
86
char **argv;
87
int argc;
88
char **environ;
89
int envc;
90
bool disabled;
91
92
/* Variables used for running processes*/
69
struct process;
70
71
typedef struct process{
93
72
pid_t pid;
94
73
int fd;
95
74
char *buffer;
96
75
size_t buffer_size;
97
76
size_t buffer_length;
98
77
bool eof;
99
volatile sig_atomic_t completed;
78
bool completed;
100
79
int status;
80
struct process *next;
81
} process;
82
83
typedef struct plugin{
84
char *name; /* can be NULL or any plugin name */
85
char **argv;
86
int argc;
87
bool disabled;
101
88
struct plugin *next;
102
89
} plugin;
103
90
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
91
static plugin *getplugin(char *name, plugin **plugin_list){
92
for (plugin *p = *plugin_list; p != NULL; p = p->next){
93
if ((p->name == name)
94
or (p->name and name and (strcmp(p->name, name) == 0))){
114
95
return p;
115
96
}
116
97
}
117
98
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
123
return NULL;
124
}
125
char *copy_name = NULL;
126
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
return NULL;
135
}
136
}
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
148
free(copy_name);
149
free(new_plugin);
150
errno = e;
151
return NULL;
152
}
153
new_plugin->argv[0] = copy_name;
99
plugin *new_plugin = malloc(sizeof(plugin));
100
if (new_plugin == NULL){
101
perror("malloc");
102
exit(EXIT_FAILURE);
103
}
104
new_plugin->name = name;
105
new_plugin->argv = malloc(sizeof(char *) * 2);
106
if (new_plugin->argv == NULL){
107
perror("malloc");
108
exit(EXIT_FAILURE);
109
}
110
new_plugin->argv[0] = name;
154
111
new_plugin->argv[1] = NULL;
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
159
if(new_plugin->environ == NULL){
160
int e = errno;
161
free(copy_name);
162
free(new_plugin->argv);
163
free(new_plugin);
164
errno = e;
165
return NULL;
166
}
167
new_plugin->environ[0] = NULL;
168
112
new_plugin->argc = 1;
113
new_plugin->disabled = false;
114
new_plugin->next = *plugin_list;
169
115
/* Append the new plugin to the list */
170
plugin_list = new_plugin;
116
*plugin_list = new_plugin;
171
117
return new_plugin;
172
118
}
173
119
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
static bool add_to_char_array(const char *new, char ***array,
177
int *len){
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
184
/* Malloc check */
185
if(new_array == NULL){
186
return false;
187
}
188
*array = new_array;
189
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
194
if(copy == NULL){
195
return false;
196
}
197
/* Insert the copy */
198
(*array)[*len] = copy;
199
(*len)++;
200
/* Add a new terminating NULL pointer to the last element */
201
(*array)[*len] = NULL;
202
return true;
203
}
204
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
static bool add_argument(plugin *p, const char *arg){
208
if(p == NULL){
209
return false;
210
}
211
return add_to_char_array(arg, &(p->argv), &(p->argc));
212
}
213
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
217
if(p == NULL){
218
return false;
219
}
220
/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
226
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
232
return false;
233
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
236
}
237
return true;
238
}
239
}
240
return add_to_char_array(def, &(p->environ), &(p->envc));
120
static void addargument(plugin *p, char *arg){
121
p->argv[p->argc] = arg;
122
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
123
if (p->argv == NULL){
124
perror("malloc");
125
exit(EXIT_FAILURE);
126
}
127
p->argc++;
128
p->argv[p->argc] = NULL;
241
129
}
242
130
243
131
/*
244
132
* Based on the example in the GNU LibC manual chapter 13.13 "File
245
133
* Descriptor Flags".
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
134
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
135
*/
248
__attribute__((warn_unused_result))
249
static int set_cloexec_flag(int fd){
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
136
static int set_cloexec_flag(int fd)
137
{
138
int ret = fcntl(fd, F_GETFD, 0);
251
139
/* If reading the flags failed, return error indication now. */
252
140
if(ret < 0){
253
141
return ret;
254
142
}
255
143
/* Store modified flag word in the descriptor. */
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
144
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
145
}
259
146
260
261
/* Mark processes as completed when they exit, and save their exit
147
const char *argp_program_version = "plugbasedclient 0.9";
148
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
262
153
status. */
263
static void handle_sigchld(__attribute__((unused)) int sig){
264
int old_errno = errno;
265
while(true){
266
plugin *proc = plugin_list;
267
int status;
268
pid_t pid = waitpid(-1, &status, WNOHANG);
269
if(pid == 0){
270
/* Only still running child processes */
271
break;
272
}
273
if(pid == -1){
274
if(errno == ECHILD){
275
/* No child processes */
276
break;
277
}
278
error(0, errno, "waitpid");
279
}
280
281
/* A child exited, find it in process_list */
282
while(proc != NULL and proc->pid != pid){
283
proc = proc->next;
284
}
285
if(proc == NULL){
286
/* Process not found in process list */
287
continue;
288
}
289
proc->status = status;
290
proc->completed = 1;
291
}
292
errno = old_errno;
293
}
294
295
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
static bool print_out_password(const char *buffer, size_t length){
298
ssize_t ret;
299
for(size_t written = 0; written < length; written += (size_t)ret){
300
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
301
length - written));
302
if(ret < 0){
303
return false;
304
}
305
}
306
return true;
307
}
308
309
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
static void free_plugin(plugin *plugin_node){
312
313
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
314
free(*arg);
315
}
316
free(plugin_node->argv);
317
for(char **env = plugin_node->environ; *env != NULL; env++){
318
free(*env);
319
}
320
free(plugin_node->environ);
321
free(plugin_node->buffer);
322
323
/* Removes the plugin from the singly-linked list */
324
if(plugin_node == plugin_list){
325
/* First one - simple */
326
plugin_list = plugin_list->next;
327
} else {
328
/* Second one or later */
329
for(plugin *p = plugin_list; p != NULL; p = p->next){
330
if(p->next == plugin_node){
331
p->next = plugin_node->next;
332
break;
333
}
334
}
335
}
336
337
free(plugin_node);
338
}
339
340
static void free_plugin_list(void){
341
while(plugin_list != NULL){
342
free_plugin(plugin_list);
343
}
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
344
171
}
345
172
346
173
int main(int argc, char *argv[]){
347
char *plugindir = NULL;
348
char *argfile = NULL;
349
FILE *conffp;
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
350
175
size_t d_name_len;
351
176
DIR *dir = NULL;
352
177
struct dirent *dirst;
353
178
struct stat st;
354
179
fd_set rfds_all;
355
180
int ret, maxfd = 0;
356
ssize_t sret;
357
181
uid_t uid = 65534;
358
182
gid_t gid = 65534;
359
183
bool debug = false;
361
185
struct sigaction old_sigchld_action;
362
186
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
363
187
.sa_flags = SA_NOCLDSTOP };
364
char **custom_argv = NULL;
365
int custom_argc = 0;
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
366
190
367
191
/* Establish a signal handler */
368
192
sigemptyset(&sigchld_action.sa_mask);
369
193
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
370
if(ret == -1){
371
error(0, errno, "sigaddset");
372
exitstatus = EX_OSERR;
373
goto fallback;
194
if(ret < 0){
195
perror("sigaddset");
196
exit(EXIT_FAILURE);
374
197
}
375
198
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
376
if(ret == -1){
377
error(0, errno, "sigaction");
378
exitstatus = EX_OSERR;
379
goto fallback;
199
if(ret < 0){
200
perror("sigaction");
201
exit(EXIT_FAILURE);
380
202
}
381
203
382
204
/* The options we understand. */
384
206
{ .name = "global-options", .key = 'g',
385
207
.arg = "OPTION[,OPTION[,...]]",
386
208
.doc = "Options passed to all plugins" },
387
{ .name = "global-env", .key = 'G',
388
.arg = "VAR=value",
389
.doc = "Environment variable passed to all plugins" },
390
209
{ .name = "options-for", .key = 'o',
391
210
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
392
211
.doc = "Options passed only to specified plugin" },
393
{ .name = "env-for", .key = 'E',
394
.arg = "PLUGIN:ENV=value",
395
.doc = "Environment variable passed to specified plugin" },
396
212
{ .name = "disable", .key = 'd',
397
213
.arg = "PLUGIN",
398
214
.doc = "Disable a specific plugin", .group = 1 },
399
{ .name = "enable", .key = 'e',
400
.arg = "PLUGIN",
401
.doc = "Enable a specific plugin", .group = 1 },
402
215
{ .name = "plugin-dir", .key = 128,
403
216
.arg = "DIRECTORY",
404
217
.doc = "Specify a different plugin directory", .group = 2 },
405
{ .name = "config-file", .key = 129,
406
.arg = "FILE",
407
.doc = "Specify a different configuration file", .group = 2 },
408
{ .name = "userid", .key = 130,
409
.arg = "ID", .flags = 0,
410
.doc = "User ID the plugins will run as", .group = 3 },
411
{ .name = "groupid", .key = 131,
412
.arg = "ID", .flags = 0,
413
.doc = "Group ID the plugins will run as", .group = 3 },
414
{ .name = "debug", .key = 132,
415
.doc = "Debug mode", .group = 4 },
416
/*
417
* These reproduce what we would get without ARGP_NO_HELP
418
*/
419
{ .name = "help", .key = '?',
420
.doc = "Give this help list", .group = -1 },
421
{ .name = "usage", .key = -3,
422
.doc = "Give a short usage message", .group = -1 },
423
{ .name = "version", .key = 'V',
424
.doc = "Print program version", .group = -1 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
425
226
{ .name = NULL }
426
227
};
427
228
428
__attribute__((nonnull(3)))
429
error_t parse_opt(int key, char *arg, struct argp_state *state){
430
errno = 0;
431
switch(key){
432
char *tmp;
433
intmax_t tmp_id;
434
case 'g': /* --global-options */
435
{
436
char *plugin_option;
437
while((plugin_option = strsep(&arg, ",")) != NULL){
438
if(not add_argument(getplugin(NULL), plugin_option)){
439
break;
440
}
441
}
442
errno = 0;
443
}
444
break;
445
case 'G': /* --global-env */
446
if(add_environment(getplugin(NULL), arg, true)){
447
errno = 0;
448
}
449
break;
450
case 'o': /* --options-for */
451
{
452
char *option_list = strchr(arg, ':');
453
if(option_list == NULL){
454
argp_error(state, "No colon in \"%s\"", arg);
455
errno = EINVAL;
456
break;
457
}
458
*option_list = '\0';
459
option_list++;
460
if(arg[0] == '\0'){
461
argp_error(state, "Empty plugin name");
462
errno = EINVAL;
463
break;
464
}
465
char *option;
466
while((option = strsep(&option_list, ",")) != NULL){
467
if(not add_argument(getplugin(arg), option)){
468
break;
469
}
470
}
471
errno = 0;
472
}
473
break;
474
case 'E': /* --env-for */
475
{
476
char *envdef = strchr(arg, ':');
477
if(envdef == NULL){
478
argp_error(state, "No colon in \"%s\"", arg);
479
errno = EINVAL;
480
break;
481
}
482
*envdef = '\0';
483
envdef++;
484
if(arg[0] == '\0'){
485
argp_error(state, "Empty plugin name");
486
errno = EINVAL;
487
break;
488
}
489
if(add_environment(getplugin(arg), envdef, true)){
490
errno = 0;
491
}
492
}
493
break;
494
case 'd': /* --disable */
495
{
496
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = true;
499
errno = 0;
500
}
501
}
502
break;
503
case 'e': /* --enable */
504
{
505
plugin *p = getplugin(arg);
506
if(p != NULL){
507
p->disabled = false;
508
errno = 0;
509
}
510
}
511
break;
512
case 128: /* --plugin-dir */
513
free(plugindir);
514
plugindir = strdup(arg);
515
if(plugindir != NULL){
516
errno = 0;
517
}
518
break;
519
case 129: /* --config-file */
520
/* This is already done by parse_opt_config_file() */
521
break;
522
case 130: /* --userid */
523
tmp_id = strtoimax(arg, &tmp, 10);
524
if(errno != 0 or tmp == arg or *tmp != '\0'
525
or tmp_id != (uid_t)tmp_id){
526
argp_error(state, "Bad user ID number: \"%s\", using %"
527
PRIdMAX, arg, (intmax_t)uid);
528
break;
529
}
530
uid = (uid_t)tmp_id;
531
errno = 0;
532
break;
533
case 131: /* --groupid */
534
tmp_id = strtoimax(arg, &tmp, 10);
535
if(errno != 0 or tmp == arg or *tmp != '\0'
536
or tmp_id != (gid_t)tmp_id){
537
argp_error(state, "Bad group ID number: \"%s\", using %"
538
PRIdMAX, arg, (intmax_t)gid);
539
break;
540
}
541
gid = (gid_t)tmp_id;
542
errno = 0;
543
break;
544
case 132: /* --debug */
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
233
switch (key) {
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
265
uid = (uid_t)strtol(arg, NULL, 10);
266
break;
267
case 130:
268
gid = (gid_t)strtol(arg, NULL, 10);
269
break;
270
case 131:
545
271
debug = true;
546
272
break;
547
/*
548
* These reproduce what we would get without ARGP_NO_HELP
549
*/
550
case '?': /* --help */
551
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
552
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
553
case -3: /* --usage */
554
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
555
argp_state_help(state, state->out_stream,
556
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
557
case 'V': /* --version */
558
fprintf(state->out_stream, "%s\n", argp_program_version);
559
exit(EXIT_SUCCESS);
560
break;
561
/*
562
* When adding more options before this line, remember to also add a
563
* "case" to the "parse_opt_config_file" function below.
564
*/
565
case ARGP_KEY_ARG:
566
/* Cryptsetup always passes an argument, which is an empty
567
string if "none" was specified in /etc/crypttab. So if
568
argument was empty, we ignore it silently. */
569
if(arg[0] == '\0'){
570
break;
571
}
572
default:
573
return ARGP_ERR_UNKNOWN;
574
}
575
return errno; /* Set to 0 at start */
576
}
577
578
/* This option parser is the same as parse_opt() above, except it
579
ignores everything but the --config-file option. */
580
error_t parse_opt_config_file(int key, char *arg,
581
__attribute__((unused))
582
struct argp_state *state){
583
errno = 0;
584
switch(key){
585
case 'g': /* --global-options */
586
case 'G': /* --global-env */
587
case 'o': /* --options-for */
588
case 'E': /* --env-for */
589
case 'd': /* --disable */
590
case 'e': /* --enable */
591
case 128: /* --plugin-dir */
592
break;
593
case 129: /* --config-file */
594
free(argfile);
595
argfile = strdup(arg);
596
if(argfile != NULL){
597
errno = 0;
598
}
599
break;
600
case 130: /* --userid */
601
case 131: /* --groupid */
602
case 132: /* --debug */
603
case '?': /* --help */
604
case -3: /* --usage */
605
case 'V': /* --version */
606
case ARGP_KEY_ARG:
607
break;
608
default:
609
return ARGP_ERR_UNKNOWN;
610
}
611
return errno;
612
}
613
614
struct argp argp = { .options = options,
615
.parser = parse_opt_config_file,
616
.args_doc = "",
273
case ARGP_KEY_ARG:
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
278
break;
279
case ARGP_KEY_END:
280
break;
281
default:
282
return ARGP_ERR_UNKNOWN;
283
}
284
return 0;
285
}
286
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
617
291
.doc = "Mandos plugin runner -- Run plugins" };
618
292
619
/* Parse using parse_opt_config_file() in order to get the custom
620
config file location, if any. */
621
ret = argp_parse(&argp, argc, argv,
622
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
623
NULL, NULL);
624
switch(ret){
625
case 0:
626
break;
627
case ENOMEM:
628
default:
629
errno = ret;
630
error(0, errno, "argp_parse");
631
exitstatus = EX_OSERR;
632
goto fallback;
633
case EINVAL:
634
exitstatus = EX_USAGE;
635
goto fallback;
636
}
637
638
/* Reset to the normal argument parser */
639
argp.parser = parse_opt;
640
641
/* Open the configfile if available */
642
if(argfile == NULL){
643
conffp = fopen(AFILE, "r");
644
} else {
645
conffp = fopen(argfile, "r");
646
}
647
if(conffp != NULL){
648
char *org_line = NULL;
649
char *p, *arg, *new_arg, *line;
650
size_t size = 0;
651
const char whitespace_delims[] = " \r\t\f\v\n";
652
const char comment_delim[] = "#";
653
654
custom_argc = 1;
655
custom_argv = malloc(sizeof(char*) * 2);
656
if(custom_argv == NULL){
657
error(0, errno, "malloc");
658
exitstatus = EX_OSERR;
659
goto fallback;
660
}
661
custom_argv[0] = argv[0];
662
custom_argv[1] = NULL;
663
664
/* for each line in the config file, strip whitespace and ignore
665
commented text */
666
while(true){
667
sret = getline(&org_line, &size, conffp);
668
if(sret == -1){
669
break;
670
}
671
672
line = org_line;
673
arg = strsep(&line, comment_delim);
674
while((p = strsep(&arg, whitespace_delims)) != NULL){
675
if(p[0] == '\0'){
676
continue;
677
}
678
new_arg = strdup(p);
679
if(new_arg == NULL){
680
error(0, errno, "strdup");
681
exitstatus = EX_OSERR;
682
free(org_line);
683
goto fallback;
684
}
685
686
custom_argc += 1;
687
{
688
char **new_argv = realloc(custom_argv, sizeof(char *)
689
* ((unsigned int)
690
custom_argc + 1));
691
if(new_argv == NULL){
692
error(0, errno, "realloc");
693
exitstatus = EX_OSERR;
694
free(new_arg);
695
free(org_line);
696
goto fallback;
697
} else {
698
custom_argv = new_argv;
699
}
700
}
701
custom_argv[custom_argc-1] = new_arg;
702
custom_argv[custom_argc] = NULL;
703
}
704
}
705
do {
706
ret = fclose(conffp);
707
} while(ret == EOF and errno == EINTR);
708
if(ret == EOF){
709
error(0, errno, "fclose");
710
exitstatus = EX_IOERR;
711
goto fallback;
712
}
713
free(org_line);
714
} else {
715
/* Check for harmful errors and go to fallback. Other errors might
716
not affect opening plugins */
717
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
718
error(0, errno, "fopen");
719
exitstatus = EX_OSERR;
720
goto fallback;
721
}
722
}
723
/* If there were any arguments from the configuration file, pass
724
them to parser as command line arguments */
725
if(custom_argv != NULL){
726
ret = argp_parse(&argp, custom_argc, custom_argv,
727
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
728
NULL, NULL);
729
switch(ret){
730
case 0:
731
break;
732
case ENOMEM:
733
default:
734
errno = ret;
735
error(0, errno, "argp_parse");
736
exitstatus = EX_OSERR;
737
goto fallback;
738
case EINVAL:
739
exitstatus = EX_CONFIG;
740
goto fallback;
741
}
742
}
743
744
/* Parse actual command line arguments, to let them override the
745
config file */
746
ret = argp_parse(&argp, argc, argv,
747
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
748
NULL, NULL);
749
switch(ret){
750
case 0:
751
break;
752
case ENOMEM:
753
default:
754
errno = ret;
755
error(0, errno, "argp_parse");
756
exitstatus = EX_OSERR;
757
goto fallback;
758
case EINVAL:
759
exitstatus = EX_USAGE;
760
goto fallback;
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
294
if (ret == ARGP_ERR_UNKNOWN){
295
perror("argp_parse");
296
exitstatus = EXIT_FAILURE;
297
goto end;
298
}
299
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
310
perror("malloc");
311
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
331
if (ret == ARGP_ERR_UNKNOWN){
332
perror("argp_parse");
333
exitstatus = EXIT_FAILURE;
334
goto end;
335
}
761
336
}
762
337
763
338
if(debug){
767
342
for(char **a = p->argv; *a != NULL; a++){
768
343
fprintf(stderr, "\tArg: %s\n", *a);
769
344
}
770
fprintf(stderr, "...and %d environment variables\n", p->envc);
771
for(char **a = p->environ; *a != NULL; a++){
772
fprintf(stderr, "\t%s\n", *a);
773
}
774
}
775
}
776
777
if(getuid() == 0){
778
/* Work around Debian bug #633582:
779
<http://bugs.debian.org/633582> */
780
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
781
if(plugindir_fd == -1){
782
error(0, errno, "open(\"" PDIR "\")");
783
} else {
784
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
785
if(ret == -1){
786
error(0, errno, "fstat");
787
} else {
788
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
789
ret = fchown(plugindir_fd, uid, gid);
790
if(ret == -1){
791
error(0, errno, "fchown");
792
}
793
}
794
}
795
TEMP_FAILURE_RETRY(close(plugindir_fd));
796
}
797
}
798
799
/* Lower permissions */
800
ret = setgid(gid);
801
if(ret == -1){
802
error(0, errno, "setgid");
803
}
345
}
346
}
347
804
348
ret = setuid(uid);
805
if(ret == -1){
806
error(0, errno, "setuid");
807
}
808
809
/* Open plugin directory with close_on_exec flag */
349
if (ret == -1){
350
perror("setuid");
351
}
352
353
setgid(gid);
354
if (ret == -1){
355
perror("setgid");
356
}
357
358
dir = opendir(plugindir);
359
if(dir == NULL){
360
perror("Could not open plugin dir");
361
exitstatus = EXIT_FAILURE;
362
goto end;
363
}
364
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
810
366
{
811
int dir_fd = -1;
812
if(plugindir == NULL){
813
dir_fd = open(PDIR, O_RDONLY |
814
#ifdef O_CLOEXEC
815
O_CLOEXEC
816
#else /* not O_CLOEXEC */
817
0
818
#endif /* not O_CLOEXEC */
819
);
820
} else {
821
dir_fd = open(plugindir, O_RDONLY |
822
#ifdef O_CLOEXEC
823
O_CLOEXEC
824
#else /* not O_CLOEXEC */
825
0
826
#endif /* not O_CLOEXEC */
827
);
828
}
829
if(dir_fd == -1){
830
error(0, errno, "Could not open plugin dir");
831
exitstatus = EX_UNAVAILABLE;
832
goto fallback;
833
}
834
835
#ifndef O_CLOEXEC
836
/* Set the FD_CLOEXEC flag on the directory */
837
ret = set_cloexec_flag(dir_fd);
838
if(ret < 0){
839
error(0, errno, "set_cloexec_flag");
840
TEMP_FAILURE_RETRY(close(dir_fd));
841
exitstatus = EX_OSERR;
842
goto fallback;
843
}
844
#endif /* O_CLOEXEC */
845
846
dir = fdopendir(dir_fd);
847
if(dir == NULL){
848
error(0, errno, "Could not open plugin dir");
849
TEMP_FAILURE_RETRY(close(dir_fd));
850
exitstatus = EX_OSERR;
851
goto fallback;
367
int dir_fd = dirfd(dir);
368
if(dir_fd >= 0){
369
ret = set_cloexec_flag(dir_fd);
370
if(ret < 0){
371
perror("set_cloexec_flag");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
852
375
}
853
376
}
854
377
855
378
FD_ZERO(&rfds_all);
856
379
857
/* Read and execute any executable in the plugin directory*/
858
380
while(true){
859
do {
860
dirst = readdir(dir);
861
} while(dirst == NULL and errno == EINTR);
381
dirst = readdir(dir);
862
382
863
/* All directory entries have been processed */
383
// All directory entries have been processed
864
384
if(dirst == NULL){
865
if(errno == EBADF){
866
error(0, errno, "readdir");
867
exitstatus = EX_IOERR;
868
goto fallback;
385
if (errno == EBADF){
386
perror("readdir");
387
exitstatus = EXIT_FAILURE;
388
goto end;
869
389
}
870
390
break;
871
391
}
872
392
873
393
d_name_len = strlen(dirst->d_name);
874
394
875
/* Ignore dotfiles, backup files and other junk */
395
// Ignore dotfiles, backup files and other junk
876
396
{
877
397
bool bad_name = false;
878
398
879
const char * const bad_prefixes[] = { ".", "#", NULL };
399
const char const *bad_prefixes[] = { ".", "#", NULL };
880
400
881
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
401
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
882
402
".dpkg-old",
883
".dpkg-bak",
884
403
".dpkg-divert", NULL };
885
#ifdef __GNUC__
886
#pragma GCC diagnostic push
887
#pragma GCC diagnostic ignored "-Wcast-qual"
888
#endif
889
for(const char **pre = (const char **)bad_prefixes;
890
*pre != NULL; pre++){
891
#ifdef __GNUC__
892
#pragma GCC diagnostic pop
893
#endif
404
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
894
405
size_t pre_len = strlen(*pre);
895
406
if((d_name_len >= pre_len)
896
407
and strncmp((dirst->d_name), *pre, pre_len) == 0){
902
413
break;
903
414
}
904
415
}
416
905
417
if(bad_name){
906
418
continue;
907
419
}
908
#ifdef __GNUC__
909
#pragma GCC diagnostic push
910
#pragma GCC diagnostic ignored "-Wcast-qual"
911
#endif
912
for(const char **suf = (const char **)bad_suffixes;
913
*suf != NULL; suf++){
914
#ifdef __GNUC__
915
#pragma GCC diagnostic pop
916
#endif
420
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
917
422
size_t suf_len = strlen(*suf);
918
423
if((d_name_len >= suf_len)
919
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
424
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
920
425
== 0)){
921
426
if(debug){
922
427
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
932
437
}
933
438
}
934
439
935
char *filename;
936
if(plugindir == NULL){
937
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
938
dirst->d_name));
939
} else {
940
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
941
plugindir,
942
dirst->d_name));
943
}
944
if(ret < 0){
945
error(0, errno, "asprintf");
946
continue;
947
}
948
949
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
950
if(ret == -1){
951
error(0, errno, "stat");
952
free(filename);
953
continue;
954
}
955
956
/* Ignore non-executable files */
957
if(not S_ISREG(st.st_mode)
958
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
449
450
ret = stat(filename, &st);
451
if (ret == -1){
452
perror("stat");
453
exitstatus = EXIT_FAILURE;
454
goto end;
455
}
456
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
959
458
if(debug){
960
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
961
460
" with bad type or mode\n", filename);
963
462
free(filename);
964
463
continue;
965
464
}
966
967
plugin *p = getplugin(dirst->d_name);
968
if(p == NULL){
969
error(0, errno, "getplugin");
970
free(filename);
971
continue;
972
}
973
if(p->disabled){
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
974
466
if(debug){
975
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
976
468
dirst->d_name);
978
470
free(filename);
979
471
continue;
980
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
981
474
{
982
475
/* Add global arguments to argument list for this plugin */
983
plugin *g = getplugin(NULL);
984
if(g != NULL){
985
for(char **a = g->argv + 1; *a != NULL; a++){
986
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
988
}
989
}
990
/* Add global environment variables */
991
for(char **e = g->environ; *e != NULL; e++){
992
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
994
}
995
}
996
}
997
}
998
/* If this plugin has any environment variables, we will call
999
using execve and need to duplicate the environment from this
1000
process, too. */
1001
if(p->environ[0] != NULL){
1002
for(char **e = environ; *e != NULL; e++){
1003
if(not add_environment(p, *e, false)){
1004
error(0, errno, "add_environment");
1005
}
1006
}
1007
}
1008
1009
int pipefd[2];
1010
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1011
if(ret == -1){
1012
error(0, errno, "pipe");
1013
exitstatus = EX_OSERR;
1014
goto fallback;
1015
}
1016
/* Ask OS to automatic close the pipe on exec */
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
482
ret = pipe(pipefd);
483
if (ret == -1){
484
perror("pipe");
485
exitstatus = EXIT_FAILURE;
486
goto end;
487
}
1017
488
ret = set_cloexec_flag(pipefd[0]);
1018
489
if(ret < 0){
1019
error(0, errno, "set_cloexec_flag");
1020
exitstatus = EX_OSERR;
1021
goto fallback;
490
perror("set_cloexec_flag");
491
exitstatus = EXIT_FAILURE;
492
goto end;
1022
493
}
1023
494
ret = set_cloexec_flag(pipefd[1]);
1024
495
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
exitstatus = EX_OSERR;
1027
goto fallback;
496
perror("set_cloexec_flag");
497
exitstatus = EXIT_FAILURE;
498
goto end;
1028
499
}
1029
500
/* Block SIGCHLD until process is safely in process list */
1030
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1031
&sigchld_action.sa_mask,
1032
NULL));
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1033
502
if(ret < 0){
1034
error(0, errno, "sigprocmask");
1035
exitstatus = EX_OSERR;
1036
goto fallback;
1037
}
1038
/* Starting a new process to be watched */
1039
pid_t pid;
1040
do {
1041
pid = fork();
1042
} while(pid == -1 and errno == EINTR);
1043
if(pid == -1){
1044
error(0, errno, "fork");
1045
exitstatus = EX_OSERR;
1046
goto fallback;
1047
}
503
perror("sigprocmask");
504
exitstatus = EXIT_FAILURE;
505
goto end;
506
}
507
// Starting a new process to be watched
508
pid_t pid = fork();
1048
509
if(pid == 0){
1049
510
/* this is the child process */
1050
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
512
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
513
perror("sigaction");
514
_exit(EXIT_FAILURE);
1054
515
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
516
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
517
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
518
perror("sigprocmask");
519
_exit(EXIT_FAILURE);
1059
520
}
1060
521
1061
522
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
523
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
524
perror("dup2");
525
_exit(EXIT_FAILURE);
1065
526
}
1066
527
1067
528
if(dirfd(dir) < 0){
1069
530
above and must now close it manually here. */
1070
531
closedir(dir);
1071
532
}
1072
if(execve(filename, p->argv,
1073
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1074
error(0, errno, "execve for %s", filename);
1075
_exit(EX_OSERR);
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
1076
536
}
1077
537
/* no return */
1078
538
}
1079
/* Parent process */
1080
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1081
pipe */
539
/* parent process */
1082
540
free(filename);
1083
plugin *new_plugin = getplugin(dirst->d_name);
1084
if(new_plugin == NULL){
1085
error(0, errno, "getplugin");
1086
ret = (int)(TEMP_FAILURE_RETRY
1087
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1088
NULL)));
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1089
546
if(ret < 0){
1090
error(0, errno, "sigprocmask");
547
perror("sigprocmask");
1091
548
}
1092
exitstatus = EX_OSERR;
1093
goto fallback;
549
exitstatus = EXIT_FAILURE;
550
goto end;
1094
551
}
1095
552
1096
new_plugin->pid = pid;
1097
new_plugin->fd = pipefd[0];
1098
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
1099
558
/* Unblock SIGCHLD so signal handler can be run if this process
1100
559
has already completed */
1101
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1102
&sigchld_action.sa_mask,
1103
NULL));
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1104
561
if(ret < 0){
1105
error(0, errno, "sigprocmask");
1106
exitstatus = EX_OSERR;
1107
goto fallback;
1108
}
1109
1110
#if defined (__GNUC__) and defined (__GLIBC__)
1111
#if not __GLIBC_PREREQ(2, 16)
1112
#pragma GCC diagnostic push
1113
#pragma GCC diagnostic ignored "-Wsign-conversion"
1114
#endif
1115
#endif
1116
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1117
-Wconversion in GNU libc
1118
before 2.16 */
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic pop
1122
#endif
1123
#endif
1124
1125
if(maxfd < new_plugin->fd){
1126
maxfd = new_plugin->fd;
1127
}
1128
}
1129
1130
TEMP_FAILURE_RETRY(closedir(dir));
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
580
}
581
582
closedir(dir);
1131
583
dir = NULL;
1132
free_plugin(getplugin(NULL));
1133
1134
for(plugin *p = plugin_list; p != NULL; p = p->next){
1135
if(p->pid != 0){
1136
break;
1137
}
1138
if(p->next == NULL){
1139
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1140
" directory?\n");
1141
free_plugin_list();
1142
}
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
1143
589
}
1144
1145
/* Main loop while running plugins exist */
1146
while(plugin_list){
590
while(process_list){
1147
591
fd_set rfds = rfds_all;
1148
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1149
if(select_ret == -1 and errno != EINTR){
1150
error(0, errno, "select");
1151
exitstatus = EX_OSERR;
1152
goto fallback;
593
if (select_ret == -1){
594
perror("select");
595
exitstatus = EXIT_FAILURE;
596
goto end;
1153
597
}
1154
598
/* OK, now either a process completed, or something can be read
1155
599
from one of them */
1156
for(plugin *proc = plugin_list; proc != NULL;){
600
for(process *proc = process_list; proc ; proc = proc->next){
1157
601
/* Is this process completely done? */
1158
if(proc->completed and proc->eof){
602
if(proc->eof and proc->completed){
1159
603
/* Only accept the plugin output if it exited cleanly */
1160
604
if(not WIFEXITED(proc->status)
1161
605
or WEXITSTATUS(proc->status) != 0){
1162
606
/* Bad exit by plugin */
1163
1164
607
if(debug){
1165
608
if(WIFEXITED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1167
" status %d\n", proc->name,
1168
(intmax_t) (proc->pid),
1169
WEXITSTATUS(proc->status));
1170
} else if(WIFSIGNALED(proc->status)){
1171
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1172
" signal %d: %s\n", proc->name,
1173
(intmax_t) (proc->pid),
1174
WTERMSIG(proc->status),
1175
strsignal(WTERMSIG(proc->status)));
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
611
} else if(WIFSIGNALED(proc->status)) {
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
1176
614
} else if(WCOREDUMP(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1178
" core\n", proc->name, (intmax_t) (proc->pid));
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1179
616
}
1180
617
}
1181
1182
618
/* Remove the plugin */
1183
#if defined (__GNUC__) and defined (__GLIBC__)
1184
#if not __GLIBC_PREREQ(2, 16)
1185
#pragma GCC diagnostic push
1186
#pragma GCC diagnostic ignored "-Wsign-conversion"
1187
#endif
1188
#endif
1189
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1190
-Wconversion in GNU libc
1191
before 2.16 */
1192
#if defined (__GNUC__) and defined (__GLIBC__)
1193
#if not __GLIBC_PREREQ(2, 16)
1194
#pragma GCC diagnostic pop
1195
#endif
1196
#endif
1197
619
FD_CLR(proc->fd, &rfds_all);
1198
620
/* Block signal while modifying process_list */
1199
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1200
(SIG_BLOCK,
1201
&sigchld_action.sa_mask,
1202
NULL));
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1203
622
if(ret < 0){
1204
error(0, errno, "sigprocmask");
1205
exitstatus = EX_OSERR;
1206
goto fallback;
1207
}
1208
1209
plugin *next_plugin = proc->next;
1210
free_plugin(proc);
1211
proc = next_plugin;
1212
623
perror("sigprocmask");
624
exitstatus = EXIT_FAILURE;
625
goto end;
626
}
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
631
} else {
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
634
if(p->next == proc){
635
p->next = proc->next;
636
break;
637
}
638
}
639
}
1213
640
/* We are done modifying process list, so unblock signal */
1214
ret = (int)(TEMP_FAILURE_RETRY
1215
(sigprocmask(SIG_UNBLOCK,
1216
&sigchld_action.sa_mask, NULL)));
641
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
642
NULL);
1217
643
if(ret < 0){
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
1220
goto fallback;
1221
}
1222
1223
if(plugin_list == NULL){
1224
break;
1225
}
1226
1227
continue;
644
perror("sigprocmask");
645
}
646
free(proc->buffer);
647
free(proc);
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
650
the process list */
651
break;
1228
652
}
1229
1230
653
/* This process exited nicely, so print its buffer */
1231
1232
bool bret = print_out_password(proc->buffer,
1233
proc->buffer_length);
1234
if(not bret){
1235
error(0, errno, "print_out_password");
1236
exitstatus = EX_IOERR;
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
658
proc->buffer_length
659
- written));
660
if(ret < 0){
661
perror("write");
662
exitstatus = EXIT_FAILURE;
663
goto end;
664
}
1237
665
}
1238
goto fallback;
666
goto end;
1239
667
}
1240
1241
668
/* This process has not completed. Does it have any output? */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic push
1245
#pragma GCC diagnostic ignored "-Wsign-conversion"
1246
#endif
1247
#endif
1248
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1249
warning from
1250
-Wconversion
1251
in GNU libc
1252
before
1253
2.16 */
1254
#if defined (__GNUC__) and defined (__GLIBC__)
1255
#if not __GLIBC_PREREQ(2, 16)
1256
#pragma GCC diagnostic pop
1257
#endif
1258
#endif
669
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1259
670
/* This process had nothing to say at this time */
1260
proc = proc->next;
1261
671
continue;
1262
672
}
1263
673
/* Before reading, make the process' data buffer large enough */
1264
674
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1265
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1266
+ (size_t) BUFFER_SIZE);
1267
if(new_buffer == NULL){
1268
error(0, errno, "malloc");
1269
exitstatus = EX_OSERR;
1270
goto fallback;
675
proc->buffer = realloc(proc->buffer, proc->buffer_size
676
+ (size_t) BUFFER_SIZE);
677
if (proc->buffer == NULL){
678
perror("malloc");
679
exitstatus = EXIT_FAILURE;
680
goto end;
1271
681
}
1272
proc->buffer = new_buffer;
1273
682
proc->buffer_size += BUFFER_SIZE;
1274
683
}
1275
684
/* Read from the process */
1276
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1277
proc->buffer
1278
+ proc->buffer_length,
1279
BUFFER_SIZE));
1280
if(sret < 0){
685
ret = read(proc->fd, proc->buffer + proc->buffer_length,
686
BUFFER_SIZE);
687
if(ret < 0){
1281
688
/* Read error from this process; ignore the error */
1282
proc = proc->next;
1283
689
continue;
1284
690
}
1285
if(sret == 0){
691
if(ret == 0){
1286
692
/* got EOF */
1287
693
proc->eof = true;
1288
694
} else {
1289
proc->buffer_length += (size_t) sret;
695
proc->buffer_length += (size_t) ret;
1290
696
}
1291
697
}
1292
698
}
1293
1294
1295
fallback:
1296
1297
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1298
and exitstatus != EX_OK)){
1299
/* Fallback if all plugins failed, none are found or an error
1300
occured */
1301
bool bret;
1302
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1303
char *passwordbuffer = getpass("Password: ");
1304
size_t len = strlen(passwordbuffer);
1305
/* Strip trailing newline */
1306
if(len > 0 and passwordbuffer[len-1] == '\n'){
1307
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1308
len--;
1309
}
1310
bret = print_out_password(passwordbuffer, len);
1311
if(not bret){
1312
error(0, errno, "print_out_password");
1313
exitstatus = EX_IOERR;
1314
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
1315
702
}
1316
703
704
end:
1317
705
/* Restore old signal handler */
1318
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1319
if(ret == -1){
1320
error(0, errno, "sigaction");
1321
exitstatus = EX_OSERR;
1322
}
1323
1324
if(custom_argv != NULL){
1325
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1326
free(*arg);
1327
}
1328
free(custom_argv);
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
707
708
free(plus_argv);
709
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
714
free(plugin_list);
1329
715
}
1330
716
1331
717
if(dir != NULL){
1332
718
closedir(dir);
1333
719
}
1334
720
1335
/* Kill the processes */
1336
for(plugin *p = plugin_list; p != NULL; p = p->next){
1337
if(p->pid != 0){
1338
close(p->fd);
1339
ret = kill(p->pid, SIGTERM);
1340
if(ret == -1 and errno != ESRCH){
1341
/* Set-uid proccesses might not get closed */
1342
error(0, errno, "kill");
1343
}
721
/* Free the process list and kill the processes */
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
728
perror("kill");
1344
729
}
730
free(process_list->buffer);
731
free(process_list);
1345
732
}
1346
733
1347
734
/* Wait for any remaining child processes to terminate */
1348
do {
735
do{
1349
736
ret = wait(NULL);
1350
737
} while(ret >= 0);
1351
738
if(errno != ECHILD){
1352
error(0, errno, "wait");
739
perror("wait");
1353
740
}
1354
741
1355
free_plugin_list();
1356
1357
free(plugindir);
1358
free(argfile);
1359
1360
742
return exitstatus;
1361
743
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0