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- Committer: Björn Påhlsson
- Date: 2008-08-11 16:35:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 66.
- Revision ID: belorn@braxen-20080811163532-er1zd4q2j4ykfv11
Fixed fallback on error in mandos-client
fixed a bug in password-request
fixed a bug in password-request
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
O_CLOEXEC, pipe2() */
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, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
60
59
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
85
typedef struct plugin{
86
char *name; /* can be NULL or any plugin name */
87
char **argv;
88
int argc;
89
char **environ;
90
int envc;
91
bool disabled;
92
93
/* Variables used for running processes*/
69
const char *argp_program_version = "mandos-client 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
94
75
pid_t pid;
95
76
int fd;
96
77
char *buffer;
97
78
size_t buffer_size;
98
79
size_t buffer_length;
99
80
bool eof;
100
volatile sig_atomic_t completed;
81
bool completed;
101
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
102
91
struct plugin *next;
103
92
} plugin;
104
93
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
115
98
return p;
116
99
}
117
100
}
118
101
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
124
return NULL;
125
}
126
char *copy_name = NULL;
127
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
return NULL;
136
}
137
}
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
149
free(copy_name);
150
free(new_plugin);
151
errno = e;
152
return NULL;
153
}
154
new_plugin->argv[0] = copy_name;
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
155
114
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
160
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
163
free(new_plugin->argv);
164
free(new_plugin);
165
errno = e;
166
return NULL;
167
}
168
new_plugin->environ[0] = NULL;
169
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
170
118
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
172
120
return new_plugin;
173
121
}
174
122
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
static bool add_to_char_array(const char *new, char ***array,
178
int *len){
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
185
/* Malloc check */
186
if(new_array == NULL){
187
return false;
188
}
189
*array = new_array;
190
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
195
if(copy == NULL){
196
return false;
197
}
198
/* Insert the copy */
199
(*array)[*len] = copy;
200
(*len)++;
201
/* Add a new terminating NULL pointer to the last element */
202
(*array)[*len] = NULL;
203
return true;
204
}
205
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
static bool add_argument(plugin *p, const char *arg){
209
if(p == NULL){
210
return false;
211
}
212
return add_to_char_array(arg, &(p->argv), &(p->argc));
213
}
214
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
218
if(p == NULL){
219
return false;
220
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
241
return add_to_char_array(def, &(p->environ), &(p->envc));
242
}
243
244
#ifndef O_CLOEXEC
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
132
}
133
245
134
/*
246
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
136
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
138
*/
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
253
142
/* If reading the flags failed, return error indication now. */
254
143
if(ret < 0){
255
144
return ret;
256
145
}
257
146
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
148
}
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
265
153
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
while(true){
269
plugin *proc = plugin_list;
270
int status;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
272
if(pid == 0){
273
/* Only still running child processes */
274
break;
275
}
276
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
280
}
281
error(0, errno, "waitpid");
282
}
283
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
286
proc = proc->next;
287
}
288
if(proc == NULL){
289
/* Process not found in process list */
290
continue;
291
}
292
proc->status = status;
293
proc->completed = 1;
294
}
295
errno = old_errno;
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;
296
171
}
297
172
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
301
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
302
178
for(size_t written = 0; written < length; written += (size_t)ret){
303
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
180
length - written));
309
185
return true;
310
186
}
311
187
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
static void free_plugin(plugin *plugin_node){
315
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->argv);
320
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(*env);
322
}
323
free(plugin_node->environ);
324
free(plugin_node->buffer);
325
326
/* Removes the plugin from the singly-linked list */
327
if(plugin_node == plugin_list){
328
/* First one - simple */
329
plugin_list = plugin_list->next;
330
} else {
331
/* Second one or later */
332
for(plugin *p = plugin_list; p != NULL; p = p->next){
333
if(p->next == plugin_node){
334
p->next = plugin_node->next;
335
break;
336
}
337
}
338
}
339
340
free(plugin_node);
341
}
342
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
346
}
347
}
348
349
188
int main(int argc, char *argv[]){
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
353
FILE *conffp;
354
struct dirent **direntries = NULL;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
190
size_t d_name_len;
191
DIR *dir = NULL;
192
struct dirent *dirst;
355
193
struct stat st;
356
194
fd_set rfds_all;
357
195
int ret, maxfd = 0;
358
ssize_t sret;
359
196
uid_t uid = 65534;
360
197
gid_t gid = 65534;
361
198
bool debug = false;
363
200
struct sigaction old_sigchld_action;
364
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
365
202
.sa_flags = SA_NOCLDSTOP };
366
char **custom_argv = NULL;
367
int custom_argc = 0;
368
int dir_fd = -1;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
errno = 0;
369
207
370
208
/* Establish a signal handler */
371
209
sigemptyset(&sigchld_action.sa_mask);
372
210
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
376
goto fallback;
211
if(ret < 0){
212
perror("sigaddset");
213
exit(EXIT_FAILURE);
377
214
}
378
215
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
382
goto fallback;
216
if(ret < 0){
217
perror("sigaction");
218
exit(EXIT_FAILURE);
383
219
}
384
220
385
221
/* The options we understand. */
387
223
{ .name = "global-options", .key = 'g',
388
224
.arg = "OPTION[,OPTION[,...]]",
389
225
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
391
.arg = "VAR=value",
392
.doc = "Environment variable passed to all plugins" },
393
226
{ .name = "options-for", .key = 'o',
394
227
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
228
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
397
.arg = "PLUGIN:ENV=value",
398
.doc = "Environment variable passed to specified plugin" },
399
229
{ .name = "disable", .key = 'd',
400
230
.arg = "PLUGIN",
401
231
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
405
232
{ .name = "plugin-dir", .key = 128,
406
233
.arg = "DIRECTORY",
407
234
.doc = "Specify a different plugin directory", .group = 2 },
408
{ .name = "config-file", .key = 129,
409
.arg = "FILE",
410
.doc = "Specify a different configuration file", .group = 2 },
411
{ .name = "userid", .key = 130,
412
.arg = "ID", .flags = 0,
413
.doc = "User ID the plugins will run as", .group = 3 },
414
{ .name = "groupid", .key = 131,
415
.arg = "ID", .flags = 0,
416
.doc = "Group ID the plugins will run as", .group = 3 },
417
{ .name = "debug", .key = 132,
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
235
{ .name = "userid", .key = 129,
236
.arg = "ID", .flags = 0,
237
.doc = "User ID the plugins will run as", .group = 2 },
238
{ .name = "groupid", .key = 130,
239
.arg = "ID", .flags = 0,
240
.doc = "Group ID the plugins will run as", .group = 2 },
241
{ .name = "debug", .key = 131,
242
.doc = "Debug mode", .group = 3 },
432
243
{ .name = NULL }
433
244
};
434
245
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
441
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
447
}
448
}
449
errno = 0;
450
}
451
break;
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
456
break;
457
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
479
}
480
break;
481
case 'E': /* --env-for */
482
{
483
char *envdef = strchr(arg, ':');
484
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
499
}
500
break;
501
case 'd': /* --disable */
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
517
}
518
break;
519
case 128: /* --plugin-dir */
520
free(plugindir);
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
break;
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
break;
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
break;
551
case 132: /* --debug */
246
error_t parse_opt (int key, char *arg, struct argp_state *state) {
247
/* Get the INPUT argument from `argp_parse', which we know is a
248
pointer to our plugin list pointer. */
249
plugin **plugins = state->input;
250
switch (key) {
251
case 'g':
252
if (arg != NULL){
253
char *p = strtok(arg, ",");
254
do{
255
addargument(getplugin(NULL, plugins), p);
256
p = strtok(NULL, ",");
257
} while (p != NULL);
258
}
259
break;
260
case 'o':
261
if (arg != NULL){
262
char *name = strtok(arg, ":");
263
char *p = strtok(NULL, ":");
264
if(p != NULL){
265
p = strtok(p, ",");
266
do{
267
addargument(getplugin(name, plugins), p);
268
p = strtok(NULL, ",");
269
} while (p != NULL);
270
}
271
}
272
break;
273
case 'd':
274
if (arg != NULL){
275
getplugin(arg, plugins)->disabled = true;
276
}
277
break;
278
case 128:
279
plugindir = arg;
280
break;
281
case 129:
282
uid = (uid_t)strtol(arg, NULL, 10);
283
break;
284
case 130:
285
gid = (gid_t)strtol(arg, NULL, 10);
286
break;
287
case 131:
552
288
debug = true;
553
289
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
default:
587
return ARGP_ERR_UNKNOWN;
588
}
589
return errno; /* Set to 0 at start */
590
}
591
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
606
break;
607
case 129: /* --config-file */
608
free(argfile);
609
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
612
}
613
break;
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
case ARGP_KEY_ARG:
622
break;
623
default:
624
return ARGP_ERR_UNKNOWN;
625
}
626
return errno;
627
}
628
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
290
case ARGP_KEY_ARG:
291
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
292
argp_usage (state);
293
}
294
plus_options = arg;
295
break;
296
case ARGP_KEY_END:
297
break;
298
default:
299
return ARGP_ERR_UNKNOWN;
300
}
301
return 0;
302
}
303
304
plugin *plugin_list = NULL;
305
306
struct argp argp = { .options = options, .parser = parse_opt,
307
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
632
308
.doc = "Mandos plugin runner -- Run plugins" };
633
309
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
650
goto fallback;
651
}
652
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
655
656
/* Open the configfile if available */
657
if(argfile == NULL){
658
conffp = fopen(AFILE, "r");
659
} else {
660
conffp = fopen(argfile, "r");
661
}
662
if(conffp != NULL){
663
char *org_line = NULL;
664
char *p, *arg, *new_arg, *line;
665
size_t size = 0;
666
const char whitespace_delims[] = " \r\t\f\v\n";
667
const char comment_delim[] = "#";
668
669
custom_argc = 1;
670
custom_argv = malloc(sizeof(char*) * 2);
671
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
674
goto fallback;
675
}
676
custom_argv[0] = argv[0];
677
custom_argv[1] = NULL;
678
679
/* for each line in the config file, strip whitespace and ignore
680
commented text */
681
while(true){
682
sret = getline(&org_line, &size, conffp);
683
if(sret == -1){
684
break;
685
}
686
687
line = org_line;
688
arg = strsep(&line, comment_delim);
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
690
if(p[0] == '\0'){
691
continue;
692
}
693
new_arg = strdup(p);
694
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
697
free(org_line);
698
goto fallback;
699
}
700
701
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((unsigned int)
705
custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
715
}
716
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
718
}
719
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
728
free(org_line);
729
} else {
730
/* Check for harmful errors and go to fallback. Other errors might
731
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
735
goto fallback;
736
}
737
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
740
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
755
goto fallback;
756
}
757
}
758
759
/* Parse actual command line arguments, to let them override the
760
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
310
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
311
if (ret == ARGP_ERR_UNKNOWN){
312
fprintf(stderr, "Unknown error while parsing arguments\n");
313
exitstatus = EXIT_FAILURE;
314
goto end;
315
}
316
317
if(plus_options){
318
/* This is a mangled argument in the form of
319
"+--option+--other-option=parameter+--yet-another-option", etc */
320
/* Make new argc and argv vars, and call argp_parse() again. */
321
plus_options++; /* skip the first '+' character */
322
const char delims[] = "+";
323
char *arg;
324
int new_argc = 1;
325
plus_argv = malloc(sizeof(char*) * 2);
326
if(plus_argv == NULL){
327
perror("malloc");
328
exitstatus = EXIT_FAILURE;
329
goto end;
330
}
331
plus_argv[0] = argv[0];
332
plus_argv[1] = NULL;
333
arg = strtok(plus_options, delims); /* Get first argument */
334
while(arg != NULL){
335
new_argc++;
336
plus_argv = realloc(plus_argv, sizeof(char *)
337
* ((unsigned int) new_argc + 1));
338
if(plus_argv == NULL){
339
perror("realloc");
340
exitstatus = EXIT_FAILURE;
341
goto end;
342
}
343
plus_argv[new_argc-1] = arg;
344
plus_argv[new_argc] = NULL;
345
arg = strtok(NULL, delims); /* Get next argument */
346
}
347
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
348
if (ret == ARGP_ERR_UNKNOWN){
349
fprintf(stderr, "Unknown error while parsing arguments\n");
350
exitstatus = EXIT_FAILURE;
351
goto end;
793
352
}
794
353
}
795
354
800
359
for(char **a = p->argv; *a != NULL; a++){
801
360
fprintf(stderr, "\tArg: %s\n", *a);
802
361
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
804
for(char **a = p->environ; *a != NULL; a++){
805
fprintf(stderr, "\t%s\n", *a);
806
}
807
}
808
}
809
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<http://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
TEMP_FAILURE_RETRY(close(plugindir_fd));
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
362
}
363
}
364
839
365
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
366
if (ret == -1){
367
perror("setuid");
368
}
369
370
setgid(gid);
371
if (ret == -1){
372
perror("setgid");
373
}
374
375
dir = opendir(plugindir);
376
if(dir == NULL){
377
perror("Could not open plugin dir");
378
exitstatus = EXIT_FAILURE;
379
goto end;
380
}
381
382
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
383
{
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
384
int dir_fd = dirfd(dir);
385
if(dir_fd >= 0){
386
ret = set_cloexec_flag(dir_fd);
387
if(ret < 0){
388
perror("set_cloexec_flag");
389
exitstatus = EXIT_FAILURE;
390
goto end;
890
391
}
891
392
}
892
return 1;
893
}
894
895
#ifdef __GLIBC__
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
909
direntries = NULL;
910
exitstatus = EX_OSERR;
911
goto fallback;
912
393
}
913
394
914
395
FD_ZERO(&rfds_all);
915
396
916
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
918
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
920
if(plugin_fd == -1){
921
error(0, errno, "Could not open plugin");
922
free(direntries[i]);
923
continue;
924
}
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
926
if(ret == -1){
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
930
continue;
931
}
932
933
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
936
X_OK, 0)) != 0)){
397
while(true){
398
dirst = readdir(dir);
399
400
// All directory entries have been processed
401
if(dirst == NULL){
402
if (errno == EBADF){
403
perror("readdir");
404
exitstatus = EXIT_FAILURE;
405
goto end;
406
}
407
break;
408
}
409
410
d_name_len = strlen(dirst->d_name);
411
412
// Ignore dotfiles, backup files and other junk
413
{
414
bool bad_name = false;
415
416
const char const *bad_prefixes[] = { ".", "#", NULL };
417
418
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
419
".dpkg-old",
420
".dpkg-divert", NULL };
421
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
422
size_t pre_len = strlen(*pre);
423
if((d_name_len >= pre_len)
424
and strncmp((dirst->d_name), *pre, pre_len) == 0){
425
if(debug){
426
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
427
" with bad prefix %s\n", dirst->d_name, *pre);
428
}
429
bad_name = true;
430
break;
431
}
432
}
433
434
if(bad_name){
435
continue;
436
}
437
438
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
439
size_t suf_len = strlen(*suf);
440
if((d_name_len >= suf_len)
441
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
442
== 0)){
443
if(debug){
444
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
445
" with bad suffix %s\n", dirst->d_name, *suf);
446
}
447
bad_name = true;
448
break;
449
}
450
}
451
452
if(bad_name){
453
continue;
454
}
455
}
456
457
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
458
if (filename == NULL){
459
perror("malloc");
460
exitstatus = EXIT_FAILURE;
461
goto end;
462
}
463
strcpy(filename, plugindir); /* Spurious warning */
464
strcat(filename, "/"); /* Spurious warning */
465
strcat(filename, dirst->d_name); /* Spurious warning */
466
467
ret = stat(filename, &st);
468
if (ret == -1){
469
perror("stat");
470
exitstatus = EXIT_FAILURE;
471
goto end;
472
}
473
474
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
937
475
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
476
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
477
" with bad type or mode\n", filename);
942
478
}
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
free(direntries[i]);
945
continue;
946
}
947
948
plugin *p = getplugin(direntries[i]->d_name);
949
if(p == NULL){
950
error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
952
free(direntries[i]);
953
continue;
954
}
955
if(p->disabled){
479
free(filename);
480
continue;
481
}
482
if(getplugin(dirst->d_name, &plugin_list)->disabled){
956
483
if(debug){
957
484
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
485
dirst->d_name);
959
486
}
960
TEMP_FAILURE_RETRY(close(plugin_fd));
961
free(direntries[i]);
487
free(filename);
962
488
continue;
963
489
}
490
plugin *p = getplugin(dirst->d_name, &plugin_list);
964
491
{
965
492
/* Add global arguments to argument list for this plugin */
966
plugin *g = getplugin(NULL);
967
if(g != NULL){
968
for(char **a = g->argv + 1; *a != NULL; a++){
969
if(not add_argument(p, *a)){
970
error(0, errno, "add_argument");
971
}
972
}
973
/* Add global environment variables */
974
for(char **e = g->environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
977
}
978
}
979
}
980
}
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
983
if(p->environ[0] != NULL){
984
for(char **e = environ; *e != NULL; e++){
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
987
}
988
}
989
}
990
991
int pipefd[2];
992
#ifndef O_CLOEXEC
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
997
if(ret == -1){
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1001
goto fallback;
1002
}
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1005
FD_SETSIZE);
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1010
goto fallback;
1011
}
1012
#ifndef O_CLOEXEC
1013
/* Ask OS to automatic close the pipe on exec */
493
plugin *g = getplugin(NULL, &plugin_list);
494
for(char **a = g->argv + 1; *a != NULL; a++){
495
addargument(p, *a);
496
}
497
}
498
int pipefd[2];
499
ret = pipe(pipefd);
500
if (ret == -1){
501
perror("pipe");
502
exitstatus = EXIT_FAILURE;
503
goto end;
504
}
1014
505
ret = set_cloexec_flag(pipefd[0]);
1015
506
if(ret < 0){
1016
error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
1021
goto fallback;
507
perror("set_cloexec_flag");
508
exitstatus = EXIT_FAILURE;
509
goto end;
1022
510
}
1023
511
ret = set_cloexec_flag(pipefd[1]);
1024
512
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
1030
goto fallback;
513
perror("set_cloexec_flag");
514
exitstatus = EXIT_FAILURE;
515
goto end;
1031
516
}
1032
#endif /* not O_CLOEXEC */
1033
517
/* Block SIGCHLD until process is safely in process list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
518
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1037
519
if(ret < 0){
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
1041
goto fallback;
1042
}
1043
/* Starting a new process to be watched */
1044
pid_t pid;
1045
do {
1046
pid = fork();
1047
} while(pid == -1 and errno == EINTR);
1048
if(pid == -1){
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
TEMP_FAILURE_RETRY(close(pipefd[0]));
1053
TEMP_FAILURE_RETRY(close(pipefd[1]));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
1056
goto fallback;
1057
}
520
perror("sigprocmask");
521
exitstatus = EXIT_FAILURE;
522
goto end;
523
}
524
// Starting a new process to be watched
525
pid_t pid = fork();
1058
526
if(pid == 0){
1059
527
/* this is the child process */
1060
528
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
529
if(ret < 0){
1062
error(0, errno, "sigaction");
1063
_exit(EX_OSERR);
530
perror("sigaction");
531
_exit(EXIT_FAILURE);
1064
532
}
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
533
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1066
534
if(ret < 0){
1067
error(0, errno, "sigprocmask");
1068
_exit(EX_OSERR);
535
perror("sigprocmask");
536
_exit(EXIT_FAILURE);
1069
537
}
1070
538
1071
539
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1072
540
if(ret == -1){
1073
error(0, errno, "dup2");
1074
_exit(EX_OSERR);
541
perror("dup2");
542
_exit(EXIT_FAILURE);
1075
543
}
1076
544
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
1082
_exit(EX_OSERR);
545
if(dirfd(dir) < 0){
546
/* If dir has no file descriptor, we could not set FD_CLOEXEC
547
above and must now close it manually here. */
548
closedir(dir);
549
}
550
if(execv(filename, p->argv) < 0){
551
perror("execv");
552
_exit(EXIT_FAILURE);
1083
553
}
1084
554
/* no return */
1085
555
}
1086
/* Parent process */
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1088
pipe */
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
1091
if(new_plugin == NULL){
1092
error(0, errno, "getplugin");
1093
ret = (int)(TEMP_FAILURE_RETRY
1094
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1095
NULL)));
556
/* parent process */
557
free(filename);
558
close(pipefd[1]); /* close unused write end of pipe */
559
process *new_process = malloc(sizeof(process));
560
if (new_process == NULL){
561
perror("malloc");
562
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1096
563
if(ret < 0){
1097
error(0, errno, "sigprocmask");
564
perror("sigprocmask");
1098
565
}
1099
exitstatus = EX_OSERR;
1100
free(direntries[i]);
1101
goto fallback;
566
exitstatus = EXIT_FAILURE;
567
goto end;
1102
568
}
1103
free(direntries[i]);
1104
1105
new_plugin->pid = pid;
1106
new_plugin->fd = pipefd[0];
1107
569
570
*new_process = (struct process){ .pid = pid,
571
.fd = pipefd[0],
572
.next = process_list };
573
// List handling
574
process_list = new_process;
1108
575
/* Unblock SIGCHLD so signal handler can be run if this process
1109
576
has already completed */
1110
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
577
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1113
578
if(ret < 0){
1114
error(0, errno, "sigprocmask");
1115
exitstatus = EX_OSERR;
1116
goto fallback;
1117
}
1118
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wsign-conversion"
1123
#endif
1124
#endif
1125
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1126
-Wconversion in GNU libc
1127
before 2.16 */
1128
#if defined (__GNUC__) and defined (__GLIBC__)
1129
#if not __GLIBC_PREREQ(2, 16)
1130
#pragma GCC diagnostic pop
1131
#endif
1132
#endif
1133
1134
if(maxfd < new_plugin->fd){
1135
maxfd = new_plugin->fd;
1136
}
1137
}
1138
1139
free(direntries);
1140
direntries = NULL;
1141
TEMP_FAILURE_RETRY(close(dir_fd));
1142
dir_fd = -1;
1143
free_plugin(getplugin(NULL));
1144
1145
for(plugin *p = plugin_list; p != NULL; p = p->next){
1146
if(p->pid != 0){
1147
break;
1148
}
1149
if(p->next == NULL){
1150
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1151
" directory?\n");
1152
free_plugin_list();
1153
}
1154
}
1155
1156
/* Main loop while running plugins exist */
1157
while(plugin_list){
579
perror("sigprocmask");
580
exitstatus = EXIT_FAILURE;
581
goto end;
582
}
583
584
FD_SET(new_process->fd, &rfds_all);
585
586
if (maxfd < new_process->fd){
587
maxfd = new_process->fd;
588
}
589
590
}
591
592
/* Free the plugin list */
593
for(plugin *next; plugin_list != NULL; plugin_list = next){
594
next = plugin_list->next;
595
free(plugin_list->argv);
596
free(plugin_list);
597
}
598
599
closedir(dir);
600
dir = NULL;
601
602
if (process_list == NULL){
603
fprintf(stderr, "No plugin processes started. Incorrect plugin"
604
" directory?\n");
605
process_list = NULL;
606
}
607
while(process_list){
1158
608
fd_set rfds = rfds_all;
1159
609
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1160
if(select_ret == -1 and errno != EINTR){
1161
error(0, errno, "select");
1162
exitstatus = EX_OSERR;
1163
goto fallback;
610
if (select_ret == -1){
611
perror("select");
612
exitstatus = EXIT_FAILURE;
613
goto end;
1164
614
}
1165
615
/* OK, now either a process completed, or something can be read
1166
616
from one of them */
1167
for(plugin *proc = plugin_list; proc != NULL;){
617
for(process *proc = process_list; proc ; proc = proc->next){
1168
618
/* Is this process completely done? */
1169
if(proc->completed and proc->eof){
619
if(proc->eof and proc->completed){
1170
620
/* Only accept the plugin output if it exited cleanly */
1171
621
if(not WIFEXITED(proc->status)
1172
622
or WEXITSTATUS(proc->status) != 0){
1173
623
/* Bad exit by plugin */
1174
1175
624
if(debug){
1176
625
if(WIFEXITED(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1178
" status %d\n", proc->name,
1179
(intmax_t) (proc->pid),
626
fprintf(stderr, "Plugin %u exited with status %d\n",
627
(unsigned int) (proc->pid),
1180
628
WEXITSTATUS(proc->status));
1181
} else if(WIFSIGNALED(proc->status)){
1182
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1183
" signal %d: %s\n", proc->name,
1184
(intmax_t) (proc->pid),
1185
WTERMSIG(proc->status),
1186
strsignal(WTERMSIG(proc->status)));
629
} else if(WIFSIGNALED(proc->status)) {
630
fprintf(stderr, "Plugin %u killed by signal %d\n",
631
(unsigned int) (proc->pid),
632
WTERMSIG(proc->status));
1187
633
} else if(WCOREDUMP(proc->status)){
1188
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1189
" core\n", proc->name, (intmax_t) (proc->pid));
634
fprintf(stderr, "Plugin %d dumped core\n",
635
(unsigned int) (proc->pid));
1190
636
}
1191
637
}
1192
1193
638
/* Remove the plugin */
1194
#if defined (__GNUC__) and defined (__GLIBC__)
1195
#if not __GLIBC_PREREQ(2, 16)
1196
#pragma GCC diagnostic push
1197
#pragma GCC diagnostic ignored "-Wsign-conversion"
1198
#endif
1199
#endif
1200
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1201
-Wconversion in GNU libc
1202
before 2.16 */
1203
#if defined (__GNUC__) and defined (__GLIBC__)
1204
#if not __GLIBC_PREREQ(2, 16)
1205
#pragma GCC diagnostic pop
1206
#endif
1207
#endif
1208
639
FD_CLR(proc->fd, &rfds_all);
1209
640
/* Block signal while modifying process_list */
1210
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1211
(SIG_BLOCK,
1212
&sigchld_action.sa_mask,
1213
NULL));
641
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1214
642
if(ret < 0){
1215
error(0, errno, "sigprocmask");
1216
exitstatus = EX_OSERR;
1217
goto fallback;
1218
}
1219
1220
plugin *next_plugin = proc->next;
1221
free_plugin(proc);
1222
proc = next_plugin;
1223
643
perror("sigprocmask");
644
exitstatus = EXIT_FAILURE;
645
goto end;
646
}
647
/* Delete this process entry from the list */
648
if(process_list == proc){
649
/* First one - simple */
650
process_list = proc->next;
651
} else {
652
/* Second one or later */
653
for(process *p = process_list; p != NULL; p = p->next){
654
if(p->next == proc){
655
p->next = proc->next;
656
break;
657
}
658
}
659
}
1224
660
/* We are done modifying process list, so unblock signal */
1225
ret = (int)(TEMP_FAILURE_RETRY
1226
(sigprocmask(SIG_UNBLOCK,
1227
&sigchld_action.sa_mask, NULL)));
661
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
662
NULL);
1228
663
if(ret < 0){
1229
error(0, errno, "sigprocmask");
1230
exitstatus = EX_OSERR;
1231
goto fallback;
1232
}
1233
1234
if(plugin_list == NULL){
1235
break;
1236
}
1237
1238
continue;
664
perror("sigprocmask");
665
}
666
free(proc->buffer);
667
free(proc);
668
/* We deleted this process from the list, so we can't go
669
proc->next. Therefore, start over from the beginning of
670
the process list */
671
break;
1239
672
}
1240
1241
673
/* This process exited nicely, so print its buffer */
1242
1243
bool bret = print_out_password(proc->buffer,
1244
proc->buffer_length);
674
675
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1245
676
if(not bret){
1246
error(0, errno, "print_out_password");
1247
exitstatus = EX_IOERR;
677
perror("print_out_password");
678
exitstatus = EXIT_FAILURE;
1248
679
}
1249
goto fallback;
680
goto end;
1250
681
}
1251
1252
682
/* This process has not completed. Does it have any output? */
1253
#if defined (__GNUC__) and defined (__GLIBC__)
1254
#if not __GLIBC_PREREQ(2, 16)
1255
#pragma GCC diagnostic push
1256
#pragma GCC diagnostic ignored "-Wsign-conversion"
1257
#endif
1258
#endif
1259
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1260
warning from
1261
-Wconversion
1262
in GNU libc
1263
before
1264
2.16 */
1265
#if defined (__GNUC__) and defined (__GLIBC__)
1266
#if not __GLIBC_PREREQ(2, 16)
1267
#pragma GCC diagnostic pop
1268
#endif
1269
#endif
683
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1270
684
/* This process had nothing to say at this time */
1271
proc = proc->next;
1272
685
continue;
1273
686
}
1274
687
/* Before reading, make the process' data buffer large enough */
1275
688
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1276
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1277
+ (size_t) BUFFER_SIZE);
1278
if(new_buffer == NULL){
1279
error(0, errno, "malloc");
1280
exitstatus = EX_OSERR;
1281
goto fallback;
689
proc->buffer = realloc(proc->buffer, proc->buffer_size
690
+ (size_t) BUFFER_SIZE);
691
if (proc->buffer == NULL){
692
perror("malloc");
693
exitstatus = EXIT_FAILURE;
694
goto end;
1282
695
}
1283
proc->buffer = new_buffer;
1284
696
proc->buffer_size += BUFFER_SIZE;
1285
697
}
1286
698
/* Read from the process */
1287
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1288
proc->buffer
1289
+ proc->buffer_length,
1290
BUFFER_SIZE));
1291
if(sret < 0){
699
ret = read(proc->fd, proc->buffer + proc->buffer_length,
700
BUFFER_SIZE);
701
if(ret < 0){
1292
702
/* Read error from this process; ignore the error */
1293
proc = proc->next;
1294
703
continue;
1295
704
}
1296
if(sret == 0){
705
if(ret == 0){
1297
706
/* got EOF */
1298
707
proc->eof = true;
1299
708
} else {
1300
proc->buffer_length += (size_t) sret;
709
proc->buffer_length += (size_t) ret;
1301
710
}
1302
711
}
1303
712
}
1304
1305
1306
fallback:
1307
1308
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1309
and exitstatus != EX_OK)){
1310
/* Fallback if all plugins failed, none are found or an error
1311
occured */
713
714
715
end:
716
717
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
718
/* Fallback if all plugins failed or an error occured */
1312
719
bool bret;
1313
720
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1314
721
char *passwordbuffer = getpass("Password: ");
1315
size_t len = strlen(passwordbuffer);
1316
/* Strip trailing newline */
1317
if(len > 0 and passwordbuffer[len-1] == '\n'){
1318
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1319
len--;
1320
}
1321
bret = print_out_password(passwordbuffer, len);
722
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1322
723
if(not bret){
1323
error(0, errno, "print_out_password");
1324
exitstatus = EX_IOERR;
724
perror("print_out_password");
725
exitstatus = EXIT_FAILURE;
726
goto end;
1325
727
}
1326
728
}
1327
729
1328
730
/* Restore old signal handler */
1329
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1330
if(ret == -1){
1331
error(0, errno, "sigaction");
1332
exitstatus = EX_OSERR;
1333
}
1334
1335
if(custom_argv != NULL){
1336
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1337
free(*arg);
1338
}
1339
free(custom_argv);
1340
}
1341
1342
free(direntries);
1343
1344
if(dir_fd != -1){
1345
TEMP_FAILURE_RETRY(close(dir_fd));
1346
}
1347
1348
/* Kill the processes */
1349
for(plugin *p = plugin_list; p != NULL; p = p->next){
1350
if(p->pid != 0){
1351
close(p->fd);
1352
ret = kill(p->pid, SIGTERM);
1353
if(ret == -1 and errno != ESRCH){
1354
/* Set-uid proccesses might not get closed */
1355
error(0, errno, "kill");
1356
}
1357
}
731
sigaction(SIGCHLD, &old_sigchld_action, NULL);
732
733
free(plus_argv);
734
735
/* Free the plugin list */
736
for(plugin *next; plugin_list != NULL; plugin_list = next){
737
next = plugin_list->next;
738
free(plugin_list->argv);
739
free(plugin_list);
740
}
741
742
if(dir != NULL){
743
closedir(dir);
744
}
745
746
/* Free the process list and kill the processes */
747
for(process *next; process_list != NULL; process_list = next){
748
next = process_list->next;
749
close(process_list->fd);
750
ret = kill(process_list->pid, SIGTERM);
751
if(ret == -1 and errno != ESRCH){
752
/* set-uid proccesses migth not get closed */
753
perror("kill");
754
}
755
free(process_list->buffer);
756
free(process_list);
1358
757
}
1359
758
1360
759
/* Wait for any remaining child processes to terminate */
1361
do {
760
do{
1362
761
ret = wait(NULL);
1363
762
} while(ret >= 0);
1364
763
if(errno != ECHILD){
1365
error(0, errno, "wait");
764
perror("wait");
1366
765
}
1367
766
1368
free_plugin_list();
1369
1370
free(plugindir);
1371
free(pluginhelperdir);
1372
free(argfile);
1373
1374
767
return exitstatus;
1375
768
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0