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- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:55:24 UTC
- Revision ID: teddy@recompile.se-20140614025524-k03150tjp4t89w1d
plugin-runner: Restore resources correctly if fork() fails.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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() */
75
#include <fnmatch.h> /* fnmatch() */
66
76
67
77
#define BUFFER_SIZE 256
68
78
69
79
#define PDIR "/lib/mandos/plugins.d"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
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;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
88
84
89
85
typedef struct plugin{
90
86
char *name; /* can be NULL or any plugin name */
93
89
char **environ;
94
90
int envc;
95
91
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
96
102
struct plugin *next;
97
103
} plugin;
98
104
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))){
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))){
103
115
return p;
104
116
}
105
117
}
106
118
/* Create a new plugin */
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
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){
109
124
return NULL;
110
125
}
111
126
char *copy_name = NULL;
112
127
if(name != NULL){
113
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
114
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
115
135
return NULL;
116
136
}
117
137
}
118
138
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
124
143
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
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;
127
149
free(copy_name);
128
150
free(new_plugin);
151
errno = e;
129
152
return NULL;
130
153
}
131
154
new_plugin->argv[0] = copy_name;
132
155
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
160
if(new_plugin->environ == NULL){
161
int e = errno;
136
162
free(copy_name);
137
163
free(new_plugin->argv);
138
164
free(new_plugin);
165
errno = e;
139
166
return NULL;
140
167
}
141
168
new_plugin->environ[0] = NULL;
169
142
170
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
144
172
return new_plugin;
145
173
}
146
174
147
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
148
177
static bool add_to_char_array(const char *new, char ***array,
149
178
int *len){
150
179
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
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);
153
185
/* Malloc check */
154
if(*array == NULL){
186
if(new_array == NULL){
155
187
return false;
156
188
}
189
*array = new_array;
157
190
/* Make a copy of the new string */
158
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
159
195
if(copy == NULL){
160
196
return false;
161
197
}
168
204
}
169
205
170
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
171
208
static bool add_argument(plugin *p, const char *arg){
172
209
if(p == NULL){
173
210
return false;
176
213
}
177
214
178
215
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
180
218
if(p == NULL){
181
219
return false;
182
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
}
183
241
return add_to_char_array(def, &(p->environ), &(p->envc));
184
242
}
185
243
186
187
244
/*
188
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
246
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
248
*/
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
195
252
/* If reading the flags failed, return error indication now. */
196
253
if(ret < 0){
197
254
return ret;
198
255
}
199
256
/* Store modified flag word in the descriptor. */
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
201
259
}
202
260
203
process *process_list = NULL;
204
261
205
262
/* Mark processes as completed when they exit, and save their exit
206
263
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
264
static void handle_sigchld(__attribute__((unused)) int sig){
265
int old_errno = errno;
208
266
while(true){
209
process *proc = process_list;
267
plugin *proc = plugin_list;
210
268
int status;
211
269
pid_t pid = waitpid(-1, &status, WNOHANG);
212
270
if(pid == 0){
214
272
break;
215
273
}
216
274
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
275
if(errno == ECHILD){
276
/* No child processes */
277
break;
219
278
}
220
/* No child processes */
221
break;
279
error(0, errno, "waitpid");
222
280
}
223
281
224
282
/* A child exited, find it in process_list */
225
283
while(proc != NULL and proc->pid != pid){
226
284
proc = proc->next;
230
288
continue;
231
289
}
232
290
proc->status = status;
233
proc->completed = true;
291
proc->completed = 1;
234
292
}
293
errno = old_errno;
235
294
}
236
295
237
bool print_out_password(const char *buffer, size_t length){
296
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
298
static bool print_out_password(const char *buffer, size_t length){
238
299
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
300
for(size_t written = 0; written < length; written += (size_t)ret){
243
301
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
302
length - written));
249
307
return true;
250
308
}
251
309
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);
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
312
static void free_plugin(plugin *plugin_node){
313
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
315
free(*arg);
316
}
317
free(plugin_node->argv);
318
for(char **env = plugin_node->environ; *env != NULL; env++){
319
free(*env);
320
}
321
free(plugin_node->environ);
322
free(plugin_node->buffer);
323
324
/* Removes the plugin from the singly-linked list */
325
if(plugin_node == plugin_list){
326
/* First one - simple */
327
plugin_list = plugin_list->next;
328
} else {
329
/* Second one or later */
330
for(plugin *p = plugin_list; p != NULL; p = p->next){
331
if(p->next == plugin_node){
332
p->next = plugin_node->next;
333
break;
334
}
335
}
336
}
337
338
free(plugin_node);
339
}
340
341
static void free_plugin_list(void){
342
while(plugin_list != NULL){
343
free_plugin(plugin_list);
264
344
}
265
345
}
266
346
268
348
char *plugindir = NULL;
269
349
char *argfile = NULL;
270
350
FILE *conffp;
271
size_t d_name_len;
272
351
DIR *dir = NULL;
273
352
struct dirent *dirst;
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;
605
863
}
606
864
607
d_name_len = strlen(dirst->d_name);
608
609
// Ignore dotfiles, backup files and other junk
865
/* Ignore dotfiles, backup files and other junk */
610
866
{
611
867
bool bad_name = false;
612
613
const char const *bad_prefixes[] = { ".", "#", NULL };
614
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
".dpkg-old",
617
".dpkg-divert", NULL };
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
size_t pre_len = strlen(*pre);
620
if((d_name_len >= pre_len)
621
and strncmp((dirst->d_name), *pre, pre_len) == 0){
622
if(debug){
623
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
624
" with bad prefix %s\n", dirst->d_name, *pre);
625
}
626
bad_name = true;
627
break;
628
}
629
}
630
631
if(bad_name){
632
continue;
633
}
634
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
size_t suf_len = strlen(*suf);
637
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
639
== 0)){
640
if(debug){
641
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
642
" with bad suffix %s\n", dirst->d_name, *suf);
643
}
644
bad_name = true;
645
break;
646
}
647
}
648
649
if(bad_name){
650
continue;
651
}
652
}
653
654
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
891
if(bad_name){
892
continue;
893
}
894
}
895
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
906
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
656
910
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)){
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
913
continue;
914
}
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
917
if(ret == -1){
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
continue;
921
}
922
923
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
669
927
if(debug){
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
672
931
}
673
free(filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
674
933
continue;
675
934
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
935
936
plugin *p = getplugin(dirst->d_name);
677
937
if(p == NULL){
678
perror("getplugin");
679
free(filename);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
680
940
continue;
681
941
}
682
942
if(p->disabled){
684
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
685
945
dirst->d_name);
686
946
}
687
free(filename);
947
TEMP_FAILURE_RETRY(close(plugin_fd));
688
948
continue;
689
949
}
690
950
{
691
951
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
952
plugin *g = getplugin(NULL);
693
953
if(g != NULL){
694
954
for(char **a = g->argv + 1; *a != NULL; a++){
695
955
if(not add_argument(p, *a)){
696
perror("add_argument");
956
error(0, errno, "add_argument");
697
957
}
698
958
}
699
959
/* Add global environment variables */
700
960
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
703
963
}
704
964
}
705
965
}
706
966
}
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. */
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
710
969
if(p->environ[0] != NULL){
711
970
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");
971
if(not add_environment(p, *e, false)){
972
error(0, errno, "add_environment");
719
973
}
720
974
}
721
975
}
722
976
723
977
int pipefd[2];
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
979
if(ret == -1){
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
728
982
goto fallback;
729
983
}
984
/* Ask OS to automatic close the pipe on exec */
730
985
ret = set_cloexec_flag(pipefd[0]);
731
986
if(ret < 0){
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
987
error(0, errno, "set_cloexec_flag");
988
TEMP_FAILURE_RETRY(close(pipefd[0]));
989
TEMP_FAILURE_RETRY(close(pipefd[1]));
990
exitstatus = EX_OSERR;
734
991
goto fallback;
735
992
}
736
993
ret = set_cloexec_flag(pipefd[1]);
737
994
if(ret < 0){
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
995
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
exitstatus = EX_OSERR;
740
999
goto fallback;
741
1000
}
742
1001
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
1004
NULL));
744
1005
if(ret < 0){
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
747
1008
goto fallback;
748
1009
}
749
// Starting a new process to be watched
750
pid_t pid = fork();
1010
/* Starting a new process to be watched */
1011
pid_t pid;
1012
do {
1013
pid = fork();
1014
} while(pid == -1 and errno == EINTR);
751
1015
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
1016
error(0, errno, "fork");
1017
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1018
&sigchld_action.sa_mask, NULL));
1019
TEMP_FAILURE_RETRY(close(pipefd[0]));
1020
TEMP_FAILURE_RETRY(close(pipefd[1]));
1021
exitstatus = EX_OSERR;
754
1022
goto fallback;
755
1023
}
756
1024
if(pid == 0){
757
1025
/* this is the child process */
758
1026
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
759
1027
if(ret < 0){
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1028
error(0, errno, "sigaction");
1029
_exit(EX_OSERR);
762
1030
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
1032
if(ret < 0){
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1033
error(0, errno, "sigprocmask");
1034
_exit(EX_OSERR);
767
1035
}
768
1036
769
1037
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
1038
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1039
error(0, errno, "dup2");
1040
_exit(EX_OSERR);
773
1041
}
774
1042
775
1043
if(dirfd(dir) < 0){
777
1045
above and must now close it manually here. */
778
1046
closedir(dir);
779
1047
}
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
}
1048
if(fexecve(plugin_fd, p->argv,
1049
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1050
error(0, errno, "fexecve for %s/%s",
1051
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1052
_exit(EX_OSERR);
790
1053
}
791
1054
/* no return */
792
1055
}
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);
1056
/* Parent process */
1057
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1058
pipe */
1059
TEMP_FAILURE_RETRY(close(plugin_fd));
1060
plugin *new_plugin = getplugin(dirst->d_name);
1061
if(new_plugin == NULL){
1062
error(0, errno, "getplugin");
1063
ret = (int)(TEMP_FAILURE_RETRY
1064
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1065
NULL)));
800
1066
if(ret < 0){
801
perror("sigprocmask");
1067
error(0, errno, "sigprocmask");
802
1068
}
803
exitstatus = EXIT_FAILURE;
1069
exitstatus = EX_OSERR;
804
1070
goto fallback;
805
1071
}
806
1072
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1073
new_plugin->pid = pid;
1074
new_plugin->fd = pipefd[0];
1075
812
1076
/* Unblock SIGCHLD so signal handler can be run if this process
813
1077
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
1080
NULL));
815
1081
if(ret < 0){
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
818
1084
goto fallback;
819
1085
}
820
1086
821
FD_SET(new_process->fd, &rfds_all);
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
822
1101
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1102
if(maxfd < new_plugin->fd){
1103
maxfd = new_plugin->fd;
825
1104
}
826
827
1105
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
1106
832
closedir(dir);
1107
TEMP_FAILURE_RETRY(closedir(dir));
833
1108
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1109
free_plugin(getplugin(NULL));
1110
1111
for(plugin *p = plugin_list; p != NULL; p = p->next){
1112
if(p->pid != 0){
1113
break;
1114
}
1115
if(p->next == NULL){
1116
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1117
" directory?\n");
1118
free_plugin_list();
1119
}
839
1120
}
840
while(process_list){
1121
1122
/* Main loop while running plugins exist */
1123
while(plugin_list){
841
1124
fd_set rfds = rfds_all;
842
1125
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1126
if(select_ret == -1 and errno != EINTR){
1127
error(0, errno, "select");
1128
exitstatus = EX_OSERR;
846
1129
goto fallback;
847
1130
}
848
1131
/* OK, now either a process completed, or something can be read
849
1132
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
1133
for(plugin *proc = plugin_list; proc != NULL;){
851
1134
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
1135
if(proc->completed and proc->eof){
853
1136
/* Only accept the plugin output if it exited cleanly */
854
1137
if(not WIFEXITED(proc->status)
855
1138
or WEXITSTATUS(proc->status) != 0){
856
1139
/* Bad exit by plugin */
1140
857
1141
if(debug){
858
1142
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1144
" status %d\n", proc->name,
1145
(intmax_t) (proc->pid),
861
1146
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));
1147
} else if(WIFSIGNALED(proc->status)){
1148
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1149
" signal %d: %s\n", proc->name,
1150
(intmax_t) (proc->pid),
1151
WTERMSIG(proc->status),
1152
strsignal(WTERMSIG(proc->status)));
866
1153
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1154
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1155
" core\n", proc->name, (intmax_t) (proc->pid));
869
1156
}
870
1157
}
1158
871
1159
/* Remove the plugin */
872
FD_CLR(proc->fd, &rfds_all);
1160
#if defined (__GNUC__) and defined (__GLIBC__)
1161
#if not __GLIBC_PREREQ(2, 16)
1162
#pragma GCC diagnostic push
1163
#pragma GCC diagnostic ignored "-Wsign-conversion"
1164
#endif
1165
#endif
1166
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1167
-Wconversion in GNU libc
1168
before 2.16 */
1169
#if defined (__GNUC__) and defined (__GLIBC__)
1170
#if not __GLIBC_PREREQ(2, 16)
1171
#pragma GCC diagnostic pop
1172
#endif
1173
#endif
1174
873
1175
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1176
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1177
(SIG_BLOCK,
1178
&sigchld_action.sa_mask,
1179
NULL));
875
1180
if(ret < 0){
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1181
error(0, errno, "sigprocmask");
1182
exitstatus = EX_OSERR;
878
1183
goto fallback;
879
1184
}
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
}
1185
1186
plugin *next_plugin = proc->next;
1187
free_plugin(proc);
1188
proc = next_plugin;
1189
893
1190
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1191
ret = (int)(TEMP_FAILURE_RETRY
1192
(sigprocmask(SIG_UNBLOCK,
1193
&sigchld_action.sa_mask, NULL)));
896
1194
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;
1195
error(0, errno, "sigprocmask");
1196
exitstatus = EX_OSERR;
1197
goto fallback;
1198
}
1199
1200
if(plugin_list == NULL){
1201
break;
1202
}
1203
1204
continue;
905
1205
}
1206
906
1207
/* This process exited nicely, so print its buffer */
907
1208
908
1209
bool bret = print_out_password(proc->buffer,
909
1210
proc->buffer_length);
910
1211
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1212
error(0, errno, "print_out_password");
1213
exitstatus = EX_IOERR;
913
1214
}
914
1215
goto fallback;
915
1216
}
1217
916
1218
/* This process has not completed. Does it have any output? */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1219
#if defined (__GNUC__) and defined (__GLIBC__)
1220
#if not __GLIBC_PREREQ(2, 16)
1221
#pragma GCC diagnostic push
1222
#pragma GCC diagnostic ignored "-Wsign-conversion"
1223
#endif
1224
#endif
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1226
warning from
1227
-Wconversion
1228
in GNU libc
1229
before
1230
2.16 */
1231
#if defined (__GNUC__) and defined (__GLIBC__)
1232
#if not __GLIBC_PREREQ(2, 16)
1233
#pragma GCC diagnostic pop
1234
#endif
1235
#endif
918
1236
/* This process had nothing to say at this time */
1237
proc = proc->next;
919
1238
continue;
920
1239
}
921
1240
/* Before reading, make the process' data buffer large enough */
922
1241
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;
1242
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1243
+ (size_t) BUFFER_SIZE);
1244
if(new_buffer == NULL){
1245
error(0, errno, "malloc");
1246
exitstatus = EX_OSERR;
928
1247
goto fallback;
929
1248
}
1249
proc->buffer = new_buffer;
930
1250
proc->buffer_size += BUFFER_SIZE;
931
1251
}
932
1252
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1253
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1254
proc->buffer
1255
+ proc->buffer_length,
1256
BUFFER_SIZE));
1257
if(sret < 0){
936
1258
/* Read error from this process; ignore the error */
1259
proc = proc->next;
937
1260
continue;
938
1261
}
939
if(ret == 0){
1262
if(sret == 0){
940
1263
/* got EOF */
941
1264
proc->eof = true;
942
1265
} else {
943
proc->buffer_length += (size_t) ret;
1266
proc->buffer_length += (size_t) sret;
944
1267
}
945
1268
}
946
1269
}
947
948
1270
1271
949
1272
fallback:
950
1273
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1274
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1275
and exitstatus != EX_OK)){
952
1276
/* Fallback if all plugins failed, none are found or an error
953
1277
occured */
954
1278
bool bret;
955
1279
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1280
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1281
size_t len = strlen(passwordbuffer);
1282
/* Strip trailing newline */
1283
if(len > 0 and passwordbuffer[len-1] == '\n'){
1284
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1285
len--;
1286
}
1287
bret = print_out_password(passwordbuffer, len);
958
1288
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1289
error(0, errno, "print_out_password");
1290
exitstatus = EX_IOERR;
961
1291
}
962
1292
}
963
1293
964
1294
/* Restore old signal handler */
965
1295
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
1296
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1297
error(0, errno, "sigaction");
1298
exitstatus = EX_OSERR;
969
1299
}
970
1300
971
1301
if(custom_argv != NULL){
972
1302
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1303
free(*arg);
974
1304
}
975
1305
free(custom_argv);
976
1306
}
977
free_plugin_list(plugin_list);
978
1307
979
1308
if(dir != NULL){
980
1309
closedir(dir);
981
1310
}
982
1311
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");
1312
/* Kill the processes */
1313
for(plugin *p = plugin_list; p != NULL; p = p->next){
1314
if(p->pid != 0){
1315
close(p->fd);
1316
ret = kill(p->pid, SIGTERM);
1317
if(ret == -1 and errno != ESRCH){
1318
/* Set-uid proccesses might not get closed */
1319
error(0, errno, "kill");
1320
}
991
1321
}
992
free(process_list->buffer);
993
free(process_list);
994
1322
}
995
1323
996
1324
/* Wait for any remaining child processes to terminate */
997
do{
1325
do {
998
1326
ret = wait(NULL);
999
1327
} while(ret >= 0);
1000
1328
if(errno != ECHILD){
1001
perror("wait");
1329
error(0, errno, "wait");
1002
1330
}
1003
1331
1332
free_plugin_list();
1333
1004
1334
free(plugindir);
1005
1335
free(argfile);
1006
1336
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0