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- Committer: Teddy Hogeborn
- Date: 2014-03-23 22:12:57 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 311.
- Revision ID: teddy@recompile.se-20140323221257-9lkufevfdn4kwoq6
Use openat() etc. in plugin-runner. Also one less useless warning.
* plugin-runner.c (main): Only print warning about failure to work
around Debian bug #633582 if the plugin
directory actually exists. Use openat(),
fstat(), faccessat(), and eliminate
asprintf().
* plugin-runner.c (main): Only print warning about failure to work
around Debian bug #633582 if the plugin
directory actually exists. Use openat(),
fstat(), faccessat(), and eliminate
asprintf().
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
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() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#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() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
88
83
89
84
typedef struct plugin{
90
85
char *name; /* can be NULL or any plugin name */
93
88
char **environ;
94
89
int envc;
95
90
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
96
101
struct plugin *next;
97
102
} plugin;
98
103
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
103
114
return p;
104
115
}
105
116
}
106
117
/* Create a new plugin */
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
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){
109
123
return NULL;
110
124
}
111
125
char *copy_name = NULL;
112
126
if(name != NULL){
113
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
114
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
115
134
return NULL;
116
135
}
117
136
}
118
137
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
124
142
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
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;
127
148
free(copy_name);
128
149
free(new_plugin);
150
errno = e;
129
151
return NULL;
130
152
}
131
153
new_plugin->argv[0] = copy_name;
132
154
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
135
159
if(new_plugin->environ == NULL){
160
int e = errno;
136
161
free(copy_name);
137
162
free(new_plugin->argv);
138
163
free(new_plugin);
164
errno = e;
139
165
return NULL;
140
166
}
141
167
new_plugin->environ[0] = NULL;
168
142
169
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
170
plugin_list = new_plugin;
144
171
return new_plugin;
145
172
}
146
173
147
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
148
176
static bool add_to_char_array(const char *new, char ***array,
149
177
int *len){
150
178
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
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);
153
184
/* Malloc check */
154
if(*array == NULL){
185
if(new_array == NULL){
155
186
return false;
156
187
}
188
*array = new_array;
157
189
/* Make a copy of the new string */
158
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
159
194
if(copy == NULL){
160
195
return false;
161
196
}
168
203
}
169
204
170
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
171
207
static bool add_argument(plugin *p, const char *arg){
172
208
if(p == NULL){
173
209
return false;
176
212
}
177
213
178
214
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
180
217
if(p == NULL){
181
218
return false;
182
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
}
183
240
return add_to_char_array(def, &(p->environ), &(p->envc));
184
241
}
185
242
186
187
243
/*
188
244
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
245
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
247
*/
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
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));
195
251
/* If reading the flags failed, return error indication now. */
196
252
if(ret < 0){
197
253
return ret;
198
254
}
199
255
/* Store modified flag word in the descriptor. */
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
201
258
}
202
259
203
process *process_list = NULL;
204
260
205
261
/* Mark processes as completed when they exit, and save their exit
206
262
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
263
static void handle_sigchld(__attribute__((unused)) int sig){
264
int old_errno = errno;
208
265
while(true){
209
process *proc = process_list;
266
plugin *proc = plugin_list;
210
267
int status;
211
268
pid_t pid = waitpid(-1, &status, WNOHANG);
212
269
if(pid == 0){
214
271
break;
215
272
}
216
273
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
274
if(errno == ECHILD){
275
/* No child processes */
276
break;
219
277
}
220
/* No child processes */
221
break;
278
error(0, errno, "waitpid");
222
279
}
223
280
224
281
/* A child exited, find it in process_list */
225
282
while(proc != NULL and proc->pid != pid){
226
283
proc = proc->next;
230
287
continue;
231
288
}
232
289
proc->status = status;
233
proc->completed = true;
290
proc->completed = 1;
234
291
}
292
errno = old_errno;
235
293
}
236
294
237
bool print_out_password(const char *buffer, size_t length){
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){
238
298
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
299
for(size_t written = 0; written < length; written += (size_t)ret){
243
300
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
301
length - written));
249
306
return true;
250
307
}
251
308
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
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);
264
343
}
265
344
}
266
345
274
353
struct stat st;
275
354
fd_set rfds_all;
276
355
int ret, maxfd = 0;
356
ssize_t sret;
277
357
uid_t uid = 65534;
278
358
gid_t gid = 65534;
279
359
bool debug = false;
283
363
.sa_flags = SA_NOCLDSTOP };
284
364
char **custom_argv = NULL;
285
365
int custom_argc = 0;
366
int dir_fd;
286
367
287
368
/* Establish a signal handler */
288
369
sigemptyset(&sigchld_action.sa_mask);
289
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
290
371
if(ret == -1){
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
293
374
goto fallback;
294
375
}
295
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
296
377
if(ret == -1){
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
299
380
goto fallback;
300
381
}
301
382
304
385
{ .name = "global-options", .key = 'g',
305
386
.arg = "OPTION[,OPTION[,...]]",
306
387
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
388
{ .name = "global-env", .key = 'G',
308
389
.arg = "VAR=value",
309
390
.doc = "Environment variable passed to all plugins" },
310
391
{ .name = "options-for", .key = 'o',
311
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
393
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
394
{ .name = "env-for", .key = 'E',
314
395
.arg = "PLUGIN:ENV=value",
315
396
.doc = "Environment variable passed to specified plugin" },
316
397
{ .name = "disable", .key = 'd',
317
398
.arg = "PLUGIN",
318
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
319
403
{ .name = "plugin-dir", .key = 128,
320
404
.arg = "DIRECTORY",
321
405
.doc = "Specify a different plugin directory", .group = 2 },
330
414
.doc = "Group ID the plugins will run as", .group = 3 },
331
415
{ .name = "debug", .key = 132,
332
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
333
426
{ .name = NULL }
334
427
};
335
428
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
367
}
368
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
435
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
450
break;
451
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
473
}
474
break;
475
case 'E': /* --env-for */
397
476
{
398
477
char *envdef = strchr(arg, ':');
399
478
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
406
484
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
409
}
410
}
411
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
419
}
420
break;
421
case 128:
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
493
}
494
break;
495
case 'd': /* --disable */
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
511
}
512
break;
513
case 128: /* --plugin-dir */
514
free(plugindir);
422
515
plugindir = strdup(arg);
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
break;
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
522
break;
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
break;
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
break;
545
case 132: /* --debug */
546
debug = true;
547
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
573
default:
574
return ARGP_ERR_UNKNOWN;
575
}
576
return errno; /* Set to 0 at start */
577
}
578
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
593
break;
594
case 129: /* --config-file */
595
free(argfile);
428
596
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
431
599
}
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
600
break;
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
442
607
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
608
break;
447
609
default:
448
610
return ARGP_ERR_UNKNOWN;
449
611
}
450
return 0;
612
return errno;
451
613
}
452
614
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
617
.args_doc = "",
457
618
.doc = "Mandos plugin runner -- Run plugins" };
458
619
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
463
636
goto fallback;
464
637
}
465
466
if (argfile == NULL){
638
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
641
642
/* Open the configfile if available */
643
if(argfile == NULL){
467
644
conffp = fopen(AFILE, "r");
468
645
} else {
469
646
conffp = fopen(argfile, "r");
470
647
}
471
472
648
if(conffp != NULL){
473
649
char *org_line = NULL;
474
650
char *p, *arg, *new_arg, *line;
475
651
size_t size = 0;
476
ssize_t sret;
477
652
const char whitespace_delims[] = " \r\t\f\v\n";
478
653
const char comment_delim[] = "#";
479
654
480
655
custom_argc = 1;
481
656
custom_argv = malloc(sizeof(char*) * 2);
482
657
if(custom_argv == NULL){
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
485
660
goto fallback;
486
661
}
487
662
custom_argv[0] = argv[0];
488
663
custom_argv[1] = NULL;
489
664
665
/* for each line in the config file, strip whitespace and ignore
666
commented text */
490
667
while(true){
491
668
sret = getline(&org_line, &size, conffp);
492
669
if(sret == -1){
493
670
break;
494
671
}
495
672
496
673
line = org_line;
497
674
arg = strsep(&line, comment_delim);
498
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
501
678
}
502
679
new_arg = strdup(p);
503
680
if(new_arg == NULL){
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
506
683
free(org_line);
507
684
goto fallback;
508
685
}
509
686
510
687
custom_argc += 1;
511
custom_argv = realloc(custom_argv, sizeof(char *)
512
* ((unsigned int) custom_argc + 1));
513
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
516
free(org_line);
517
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
518
701
}
519
702
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
703
custom_argv[custom_argc] = NULL;
521
704
}
522
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
523
714
free(org_line);
524
} else{
715
} else {
525
716
/* Check for harmful errors and go to fallback. Other errors might
526
717
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
530
721
goto fallback;
531
722
}
532
723
}
533
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
534
726
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
539
741
goto fallback;
540
742
}
541
743
}
542
744
745
/* Parse actual command line arguments, to let them override the
746
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
761
goto fallback;
762
}
763
543
764
if(debug){
544
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
768
for(char **a = p->argv; *a != NULL; a++){
548
769
fprintf(stderr, "\tArg: %s\n", *a);
549
770
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
772
for(char **a = p->environ; *a != NULL; a++){
552
773
fprintf(stderr, "\t%s\n", *a);
553
774
}
554
775
}
555
776
}
556
777
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
557
807
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
571
}
572
573
if(dir == NULL){
574
perror("Could not open plugin dir");
575
exitstatus = EXIT_FAILURE;
576
goto fallback;
577
}
578
579
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
580
813
{
581
int dir_fd = dirfd(dir);
582
if(dir_fd >= 0){
583
ret = set_cloexec_flag(dir_fd);
584
if(ret < 0){
585
perror("set_cloexec_flag");
586
exitstatus = EXIT_FAILURE;
587
goto fallback;
588
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
589
844
}
590
845
}
591
846
592
847
FD_ZERO(&rfds_all);
593
848
849
/* Read and execute any executable in the plugin directory*/
594
850
while(true){
595
dirst = readdir(dir);
851
do {
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
596
854
597
// All directory entries have been processed
855
/* All directory entries have been processed */
598
856
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
857
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
602
860
goto fallback;
603
861
}
604
862
break;
606
864
607
865
d_name_len = strlen(dirst->d_name);
608
866
609
// Ignore dotfiles, backup files and other junk
867
/* Ignore dotfiles, backup files and other junk */
610
868
{
611
869
bool bad_name = false;
612
870
613
const char const *bad_prefixes[] = { ".", "#", NULL };
871
const char * const bad_prefixes[] = { ".", "#", NULL };
614
872
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
873
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
616
874
".dpkg-old",
875
".dpkg-bak",
617
876
".dpkg-divert", NULL };
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pre = (const char **)bad_prefixes;
882
*pre != NULL; pre++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
619
886
size_t pre_len = strlen(*pre);
620
887
if((d_name_len >= pre_len)
621
888
and strncmp((dirst->d_name), *pre, pre_len) == 0){
627
894
break;
628
895
}
629
896
}
630
631
897
if(bad_name){
632
898
continue;
633
899
}
634
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
900
#ifdef __GNUC__
901
#pragma GCC diagnostic push
902
#pragma GCC diagnostic ignored "-Wcast-qual"
903
#endif
904
for(const char **suf = (const char **)bad_suffixes;
905
*suf != NULL; suf++){
906
#ifdef __GNUC__
907
#pragma GCC diagnostic pop
908
#endif
636
909
size_t suf_len = strlen(*suf);
637
910
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
911
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
639
912
== 0)){
640
913
if(debug){
641
914
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
650
923
continue;
651
924
}
652
925
}
653
654
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
926
927
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
928
#ifdef O_CLOEXEC
929
O_CLOEXEC
930
#else /* not O_CLOEXEC */
931
0
932
#endif /* not O_CLOEXEC */
933
);
934
if(plugin_fd == -1){
935
error(0, errno, "Could not open plugin");
936
continue;
937
}
938
#ifndef O_CLOEXEC
939
/* Set the FD_CLOEXEC flag on the plugin FD */
940
ret = set_cloexec_flag(plugin_fd);
656
941
if(ret < 0){
657
perror("asprintf");
658
continue;
659
}
660
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
664
free(filename);
665
continue;
666
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
942
error(0, errno, "set_cloexec_flag");
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
continue;
945
}
946
#endif /* O_CLOEXEC */
947
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
948
if(ret == -1){
949
error(0, errno, "stat");
950
TEMP_FAILURE_RETRY(close(plugin_fd));
951
continue;
952
}
953
954
/* Ignore non-executable files */
955
if(not S_ISREG(st.st_mode)
956
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
957
0)) != 0)){
669
958
if(debug){
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
" with bad type or mode\n", filename);
959
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
960
" with bad type or mode\n",
961
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
672
962
}
673
free(filename);
963
TEMP_FAILURE_RETRY(close(plugin_fd));
674
964
continue;
675
965
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
966
967
plugin *p = getplugin(dirst->d_name);
677
968
if(p == NULL){
678
perror("getplugin");
679
free(filename);
969
error(0, errno, "getplugin");
970
TEMP_FAILURE_RETRY(close(plugin_fd));
680
971
continue;
681
972
}
682
973
if(p->disabled){
684
975
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
685
976
dirst->d_name);
686
977
}
687
free(filename);
978
TEMP_FAILURE_RETRY(close(plugin_fd));
688
979
continue;
689
980
}
690
981
{
691
982
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
983
plugin *g = getplugin(NULL);
693
984
if(g != NULL){
694
985
for(char **a = g->argv + 1; *a != NULL; a++){
695
986
if(not add_argument(p, *a)){
696
perror("add_argument");
987
error(0, errno, "add_argument");
697
988
}
698
989
}
699
990
/* Add global environment variables */
700
991
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
992
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
703
994
}
704
995
}
705
996
}
706
997
}
707
/* If this plugin has any environment variables, we will call
708
using execve and need to duplicate the environment from this
709
process, too. */
998
/* If this plugin has any environment variables, we need to
999
duplicate the environment from this process, too. */
710
1000
if(p->environ[0] != NULL){
711
1001
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
1002
if(not add_environment(p, *e, false)){
1003
error(0, errno, "add_environment");
719
1004
}
720
1005
}
721
1006
}
722
1007
723
1008
int pipefd[2];
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
1009
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1010
if(ret == -1){
1011
error(0, errno, "pipe");
1012
exitstatus = EX_OSERR;
728
1013
goto fallback;
729
1014
}
1015
/* Ask OS to automatic close the pipe on exec */
730
1016
ret = set_cloexec_flag(pipefd[0]);
731
1017
if(ret < 0){
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
1018
error(0, errno, "set_cloexec_flag");
1019
exitstatus = EX_OSERR;
734
1020
goto fallback;
735
1021
}
736
1022
ret = set_cloexec_flag(pipefd[1]);
737
1023
if(ret < 0){
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
1024
error(0, errno, "set_cloexec_flag");
1025
exitstatus = EX_OSERR;
740
1026
goto fallback;
741
1027
}
742
1028
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1029
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1030
&sigchld_action.sa_mask,
1031
NULL));
744
1032
if(ret < 0){
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
1033
error(0, errno, "sigprocmask");
1034
exitstatus = EX_OSERR;
747
1035
goto fallback;
748
1036
}
749
// Starting a new process to be watched
750
pid_t pid = fork();
1037
/* Starting a new process to be watched */
1038
pid_t pid;
1039
do {
1040
pid = fork();
1041
} while(pid == -1 and errno == EINTR);
751
1042
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
1043
error(0, errno, "fork");
1044
exitstatus = EX_OSERR;
754
1045
goto fallback;
755
1046
}
756
1047
if(pid == 0){
757
1048
/* this is the child process */
758
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
759
1050
if(ret < 0){
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
762
1053
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
1055
if(ret < 0){
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
767
1058
}
768
1059
769
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
1061
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
773
1064
}
774
1065
775
1066
if(dirfd(dir) < 0){
777
1068
above and must now close it manually here. */
778
1069
closedir(dir);
779
1070
}
780
if(p->environ[0] == NULL){
781
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
784
}
785
} else {
786
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
789
}
1071
if(fexecve(plugin_fd, p->argv,
1072
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1073
error(0, errno, "fexecve for %s/%s",
1074
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1075
_exit(EX_OSERR);
790
1076
}
791
1077
/* no return */
792
1078
}
793
/* parent process */
794
free(filename);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1079
/* Parent process */
1080
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1081
pipe */
1082
TEMP_FAILURE_RETRY(close(plugin_fd));
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)));
800
1089
if(ret < 0){
801
perror("sigprocmask");
1090
error(0, errno, "sigprocmask");
802
1091
}
803
exitstatus = EXIT_FAILURE;
1092
exitstatus = EX_OSERR;
804
1093
goto fallback;
805
1094
}
806
1095
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1096
new_plugin->pid = pid;
1097
new_plugin->fd = pipefd[0];
1098
812
1099
/* Unblock SIGCHLD so signal handler can be run if this process
813
1100
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1101
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1102
&sigchld_action.sa_mask,
1103
NULL));
815
1104
if(ret < 0){
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1105
error(0, errno, "sigprocmask");
1106
exitstatus = EX_OSERR;
818
1107
goto fallback;
819
1108
}
820
1109
821
FD_SET(new_process->fd, &rfds_all);
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
822
1124
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1125
if(maxfd < new_plugin->fd){
1126
maxfd = new_plugin->fd;
825
1127
}
826
827
1128
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
1129
832
closedir(dir);
1130
TEMP_FAILURE_RETRY(closedir(dir));
833
1131
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = 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
}
839
1143
}
840
while(process_list){
1144
1145
/* Main loop while running plugins exist */
1146
while(plugin_list){
841
1147
fd_set rfds = rfds_all;
842
1148
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1149
if(select_ret == -1 and errno != EINTR){
1150
error(0, errno, "select");
1151
exitstatus = EX_OSERR;
846
1152
goto fallback;
847
1153
}
848
1154
/* OK, now either a process completed, or something can be read
849
1155
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
1156
for(plugin *proc = plugin_list; proc != NULL;){
851
1157
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
1158
if(proc->completed and proc->eof){
853
1159
/* Only accept the plugin output if it exited cleanly */
854
1160
if(not WIFEXITED(proc->status)
855
1161
or WEXITSTATUS(proc->status) != 0){
856
1162
/* Bad exit by plugin */
1163
857
1164
if(debug){
858
1165
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1167
" status %d\n", proc->name,
1168
(intmax_t) (proc->pid),
861
1169
WEXITSTATUS(proc->status));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(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)));
866
1176
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1178
" core\n", proc->name, (intmax_t) (proc->pid));
869
1179
}
870
1180
}
1181
871
1182
/* Remove the plugin */
872
FD_CLR(proc->fd, &rfds_all);
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
873
1198
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1199
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1200
(SIG_BLOCK,
1201
&sigchld_action.sa_mask,
1202
NULL));
875
1203
if(ret < 0){
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "sigprocmask");
1205
exitstatus = EX_OSERR;
878
1206
goto fallback;
879
1207
}
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1208
1209
plugin *next_plugin = proc->next;
1210
free_plugin(proc);
1211
proc = next_plugin;
1212
893
1213
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1214
ret = (int)(TEMP_FAILURE_RETRY
1215
(sigprocmask(SIG_UNBLOCK,
1216
&sigchld_action.sa_mask, NULL)));
896
1217
if(ret < 0){
897
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
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;
905
1228
}
1229
906
1230
/* This process exited nicely, so print its buffer */
907
1231
908
1232
bool bret = print_out_password(proc->buffer,
909
1233
proc->buffer_length);
910
1234
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1235
error(0, errno, "print_out_password");
1236
exitstatus = EX_IOERR;
913
1237
}
914
1238
goto fallback;
915
1239
}
1240
916
1241
/* This process has not completed. Does it have any output? */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
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
918
1259
/* This process had nothing to say at this time */
1260
proc = proc->next;
919
1261
continue;
920
1262
}
921
1263
/* Before reading, make the process' data buffer large enough */
922
1264
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
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;
928
1270
goto fallback;
929
1271
}
1272
proc->buffer = new_buffer;
930
1273
proc->buffer_size += BUFFER_SIZE;
931
1274
}
932
1275
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1276
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1277
proc->buffer
1278
+ proc->buffer_length,
1279
BUFFER_SIZE));
1280
if(sret < 0){
936
1281
/* Read error from this process; ignore the error */
1282
proc = proc->next;
937
1283
continue;
938
1284
}
939
if(ret == 0){
1285
if(sret == 0){
940
1286
/* got EOF */
941
1287
proc->eof = true;
942
1288
} else {
943
proc->buffer_length += (size_t) ret;
1289
proc->buffer_length += (size_t) sret;
944
1290
}
945
1291
}
946
1292
}
947
948
1293
1294
949
1295
fallback:
950
1296
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1297
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1298
and exitstatus != EX_OK)){
952
1299
/* Fallback if all plugins failed, none are found or an error
953
1300
occured */
954
1301
bool bret;
955
1302
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1303
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
958
1311
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1312
error(0, errno, "print_out_password");
1313
exitstatus = EX_IOERR;
961
1314
}
962
1315
}
963
1316
964
1317
/* Restore old signal handler */
965
1318
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
1319
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1320
error(0, errno, "sigaction");
1321
exitstatus = EX_OSERR;
969
1322
}
970
1323
971
1324
if(custom_argv != NULL){
972
1325
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1326
free(*arg);
974
1327
}
975
1328
free(custom_argv);
976
1329
}
977
free_plugin_list(plugin_list);
978
1330
979
1331
if(dir != NULL){
980
1332
closedir(dir);
981
1333
}
982
1334
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
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
}
991
1344
}
992
free(process_list->buffer);
993
free(process_list);
994
1345
}
995
1346
996
1347
/* Wait for any remaining child processes to terminate */
997
do{
1348
do {
998
1349
ret = wait(NULL);
999
1350
} while(ret >= 0);
1000
1351
if(errno != ECHILD){
1001
perror("wait");
1352
error(0, errno, "wait");
1002
1353
}
1003
1354
1355
free_plugin_list();
1356
1004
1357
free(plugindir);
1005
1358
free(argfile);
1006
1359
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0