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- Committer: Teddy Hogeborn
- Date: 2008-08-01 06:33:15 UTC
- Revision ID: teddy@fukt.bsnet.se-20080801063315-4k33q3ek28hjc3tu
* plugins.d/plugbasedclient.c: Update include file comments.
(struct process.disable): Renamed to "disabled". All users changed.
(addarguments): Renamed to "addargument". All callers changed.
(doc, args_doc): Removed.
(main): Changed default "plugindir" to
"/conf/conf.d/mandos/plugins.d". Renamed "rfds_orig" to
"rfds_all"; all users changed. New "debug" and
"exitstatus" variables. New "--debug" option. Removed
unnecessary ".flags = 0" from all options. Changed so that
"--disable-plugin" only takes one plugin. Check for
non-existence of ":" in argument to "--options-for". Added
some debugging outputs. Set the FD_CLOEXEC flag on the
directory FD. More capable code for dealing with
disallowed plugin file name prefixes and suffixes. Bug
fix: check for some malloc failures. Moved allocating the
"struct process *new_process" to after the fork. Do
_exit() instead of exit() in the child.
* plugins.d/mandosclient.c: Updated contact information.
(struct process.disable): Renamed to "disabled". All users changed.
(addarguments): Renamed to "addargument". All callers changed.
(doc, args_doc): Removed.
(main): Changed default "plugindir" to
"/conf/conf.d/mandos/plugins.d". Renamed "rfds_orig" to
"rfds_all"; all users changed. New "debug" and
"exitstatus" variables. New "--debug" option. Removed
unnecessary ".flags = 0" from all options. Changed so that
"--disable-plugin" only takes one plugin. Check for
non-existence of ":" in argument to "--options-for". Added
some debugging outputs. Set the FD_CLOEXEC flag on the
directory FD. More capable code for dealing with
disallowed plugin file name prefixes and suffixes. Bug
fix: check for some malloc failures. Moved allocating the
"struct process *new_process" to after the fork. Do
_exit() instead of exit() in the child.
* plugins.d/mandosclient.c: Updated contact information.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
32
25
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
26
#include <iso646.h> /* and, or, not */
27
#include <sys/types.h> /* DIR, opendir(), stat(), struct stat,
28
waitpid(), WIFEXITED(),
29
WEXITSTATUS(), wait() */
30
#include <sys/wait.h> /* wait() */
31
#include <dirent.h> /* DIR, struct dirent, opendir(),
32
readdir(), closedir() */
43
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
34
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
35
fcntl() */
36
#include <fcntl.h> /* fcntl() */
37
#include <stddef.h> /* NULL */
38
#include <stdlib.h> /* EXIT_FAILURE */
39
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
40
FD_SET(), FD_ISSET() */
41
#include <string.h> /* strlen(), strcpy(), strcat() */
42
#include <stdbool.h> /* true */
43
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
44
WEXITSTATUS() */
58
45
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
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
76
#define BUFFER_SIZE 256
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
48
argp_parse() */
49
50
struct process;
51
52
typedef struct process{
53
pid_t pid;
54
int fd;
55
char *buffer;
56
size_t buffer_size;
57
size_t buffer_length;
58
struct process *next;
59
} process;
83
60
84
61
typedef struct plugin{
85
62
char *name; /* can be NULL or any plugin name */
86
63
char **argv;
87
64
int argc;
88
char **environ;
89
int envc;
90
65
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;
101
66
struct plugin *next;
102
67
} plugin;
103
68
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
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
69
plugin *getplugin(char *name, plugin **plugin_list){
70
for (plugin *p = *plugin_list; p != NULL; p = p->next){
71
if ((p->name == name)
72
or (p->name and name and (strcmp(p->name, name) == 0))){
113
73
return p;
114
74
}
115
75
}
116
76
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
122
return NULL;
123
}
124
char *copy_name = NULL;
125
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
return NULL;
134
}
135
}
136
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
141
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
147
free(copy_name);
148
free(new_plugin);
149
errno = e;
150
return NULL;
151
}
152
new_plugin->argv[0] = copy_name;
77
plugin *new_plugin = malloc(sizeof(plugin));
78
if (new_plugin == NULL){
79
perror("malloc");
80
exit(EXIT_FAILURE);
81
}
82
new_plugin->name = name;
83
new_plugin->argv = malloc(sizeof(char *) * 2);
84
if (new_plugin->argv == NULL){
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
new_plugin->argv[0] = name;
153
89
new_plugin->argv[1] = NULL;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
158
if(new_plugin->environ == NULL){
159
int e = errno;
160
free(copy_name);
161
free(new_plugin->argv);
162
free(new_plugin);
163
errno = e;
164
return NULL;
165
}
166
new_plugin->environ[0] = NULL;
167
90
new_plugin->argc = 1;
91
new_plugin->disabled = false;
92
new_plugin->next = *plugin_list;
168
93
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
94
*plugin_list = new_plugin;
170
95
return new_plugin;
171
96
}
172
97
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
static bool add_to_char_array(const char *new, char ***array,
176
int *len){
177
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
182
/* Malloc check */
183
if(*array == NULL){
184
return false;
185
}
186
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
191
if(copy == NULL){
192
return false;
193
}
194
/* Insert the copy */
195
(*array)[*len] = copy;
196
(*len)++;
197
/* Add a new terminating NULL pointer to the last element */
198
(*array)[*len] = NULL;
199
return true;
200
}
201
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
static bool add_argument(plugin *p, const char *arg){
205
if(p == NULL){
206
return false;
207
}
208
return add_to_char_array(arg, &(p->argv), &(p->argc));
209
}
210
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
214
if(p == NULL){
215
return false;
216
}
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
223
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
229
return false;
230
}
231
*e = new;
232
strcpy(*e, def);
233
}
234
return true;
235
}
236
}
237
return add_to_char_array(def, &(p->environ), &(p->envc));
238
}
239
240
/*
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
244
*/
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
247
/* If reading the flags failed, return error indication now. */
248
if(ret < 0){
249
return ret;
250
}
251
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
254
}
255
256
257
/* Mark processes as completed when they exit, and save their exit
258
status. */
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
261
while(true){
262
plugin *proc = plugin_list;
263
int status;
264
pid_t pid = waitpid(-1, &status, WNOHANG);
265
if(pid == 0){
266
/* Only still running child processes */
267
break;
268
}
269
if(pid == -1){
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
273
}
274
error(0, errno, "waitpid");
275
}
276
277
/* A child exited, find it in process_list */
278
while(proc != NULL and proc->pid != pid){
279
proc = proc->next;
280
}
281
if(proc == NULL){
282
/* Process not found in process list */
283
continue;
284
}
285
proc->status = status;
286
proc->completed = 1;
287
}
288
errno = old_errno;
289
}
290
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
294
ssize_t ret;
295
for(size_t written = 0; written < length; written += (size_t)ret){
296
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
297
length - written));
298
if(ret < 0){
299
return false;
300
}
301
}
302
return true;
303
}
304
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
static void free_plugin(plugin *plugin_node){
308
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
310
free(*arg);
311
}
312
free(plugin_node->argv);
313
for(char **env = plugin_node->environ; *env != NULL; env++){
314
free(*env);
315
}
316
free(plugin_node->environ);
317
free(plugin_node->buffer);
318
319
/* Removes the plugin from the singly-linked list */
320
if(plugin_node == plugin_list){
321
/* First one - simple */
322
plugin_list = plugin_list->next;
323
} else {
324
/* Second one or later */
325
for(plugin *p = plugin_list; p != NULL; p = p->next){
326
if(p->next == plugin_node){
327
p->next = plugin_node->next;
328
break;
329
}
330
}
331
}
332
333
free(plugin_node);
334
}
335
336
static void free_plugin_list(void){
337
while(plugin_list != NULL){
338
free_plugin(plugin_list);
339
}
340
}
98
void addargument(plugin *p, char *arg){
99
p->argv[p->argc] = arg;
100
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
101
if (p->argv == NULL){
102
perror("malloc");
103
exit(EXIT_FAILURE);
104
}
105
p->argc++;
106
p->argv[p->argc] = NULL;
107
}
108
109
#define BUFFER_SIZE 256
110
111
const char *argp_program_version =
112
"plugbasedclient 0.9";
113
const char *argp_program_bug_address =
114
"<mandos@fukt.bsnet.se>";
341
115
342
116
int main(int argc, char *argv[]){
343
char *plugindir = NULL;
344
char *argfile = NULL;
345
FILE *conffp;
117
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
346
118
size_t d_name_len;
347
DIR *dir = NULL;
119
DIR *dir;
348
120
struct dirent *dirst;
349
121
struct stat st;
350
122
fd_set rfds_all;
351
123
int ret, maxfd = 0;
352
ssize_t sret;
353
uid_t uid = 65534;
354
gid_t gid = 65534;
124
process *process_list = NULL;
355
125
bool debug = false;
356
126
int exitstatus = EXIT_SUCCESS;
357
struct sigaction old_sigchld_action;
358
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
359
.sa_flags = SA_NOCLDSTOP };
360
char **custom_argv = NULL;
361
int custom_argc = 0;
362
363
/* Establish a signal handler */
364
sigemptyset(&sigchld_action.sa_mask);
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
369
goto fallback;
370
}
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
375
goto fallback;
376
}
377
127
378
128
/* The options we understand. */
379
129
struct argp_option options[] = {
380
130
{ .name = "global-options", .key = 'g',
381
131
.arg = "OPTION[,OPTION[,...]]",
382
132
.doc = "Options passed to all plugins" },
383
{ .name = "global-env", .key = 'G',
384
.arg = "VAR=value",
385
.doc = "Environment variable passed to all plugins" },
386
133
{ .name = "options-for", .key = 'o',
387
134
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
388
135
.doc = "Options passed only to specified plugin" },
389
{ .name = "env-for", .key = 'E',
390
.arg = "PLUGIN:ENV=value",
391
.doc = "Environment variable passed to specified plugin" },
392
136
{ .name = "disable", .key = 'd',
393
137
.arg = "PLUGIN",
394
138
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
396
.arg = "PLUGIN",
397
.doc = "Enable a specific plugin", .group = 1 },
398
139
{ .name = "plugin-dir", .key = 128,
399
140
.arg = "DIRECTORY",
400
141
.doc = "Specify a different plugin directory", .group = 2 },
401
{ .name = "config-file", .key = 129,
402
.arg = "FILE",
403
.doc = "Specify a different configuration file", .group = 2 },
404
{ .name = "userid", .key = 130,
405
.arg = "ID", .flags = 0,
406
.doc = "User ID the plugins will run as", .group = 3 },
407
{ .name = "groupid", .key = 131,
408
.arg = "ID", .flags = 0,
409
.doc = "Group ID the plugins will run as", .group = 3 },
410
{ .name = "debug", .key = 132,
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
142
{ .name = "debug", .key = 129,
143
.doc = "Debug mode", .group = 3 },
421
144
{ .name = NULL }
422
145
};
423
146
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
436
}
437
}
438
}
439
break;
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
442
break;
443
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
462
}
463
}
464
}
465
break;
466
case 'E': /* --env-for */
467
{
468
char *envdef = strchr(arg, ':');
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
break;
473
}
474
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
480
}
481
add_environment(getplugin(arg), envdef, true);
482
}
483
break;
484
case 'd': /* --disable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
489
}
490
}
491
break;
492
case 'e': /* --enable */
493
{
494
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
497
}
498
}
499
break;
500
case 128: /* --plugin-dir */
501
free(plugindir);
502
plugindir = strdup(arg);
503
break;
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
506
break;
507
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
516
break;
517
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
526
break;
527
case 132: /* --debug */
147
error_t parse_opt (int key, char *arg, struct argp_state *state) {
148
/* Get the INPUT argument from `argp_parse', which we
149
know is a pointer to our plugin list pointer. */
150
plugin **plugins = state->input;
151
switch (key) {
152
case 'g':
153
if (arg != NULL){
154
char *p = strtok(arg, ",");
155
do{
156
addargument(getplugin(NULL, plugins), p);
157
p = strtok(NULL, ",");
158
} while (p);
159
}
160
break;
161
case 'o':
162
if (arg != NULL){
163
char *name = strtok(arg, ":");
164
char *p = strtok(NULL, ":");
165
if(p){
166
p = strtok(p, ",");
167
do{
168
addargument(getplugin(name, plugins), p);
169
p = strtok(NULL, ",");
170
} while (p);
171
}
172
}
173
break;
174
case 'd':
175
if (arg != NULL){
176
getplugin(arg, plugins)->disabled = true;
177
}
178
break;
179
case 128:
180
plugindir = arg;
181
break;
182
case 129:
528
183
debug = true;
529
184
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
548
case ARGP_KEY_ARG:
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
554
}
555
default:
556
return ARGP_ERR_UNKNOWN;
557
}
558
return errno; /* Set to 0 at start */
559
}
560
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
575
break;
576
case 129: /* --config-file */
577
free(argfile);
578
argfile = strdup(arg);
579
break;
580
case 130: /* --userid */
581
case 131: /* --groupid */
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
case ARGP_KEY_ARG:
587
break;
588
default:
589
return ARGP_ERR_UNKNOWN;
590
}
591
return errno;
592
}
593
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
185
case ARGP_KEY_ARG:
186
argp_usage (state);
187
break;
188
case ARGP_KEY_END:
189
break;
190
default:
191
return ARGP_ERR_UNKNOWN;
192
}
193
return 0;
194
}
195
196
plugin *plugin_list = NULL;
197
198
struct argp argp = { .options = options, .parser = parse_opt,
596
199
.args_doc = "",
597
200
.doc = "Mandos plugin runner -- Run plugins" };
598
201
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
615
goto fallback;
616
}
617
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
620
621
/* Open the configfile if available */
622
if(argfile == NULL){
623
conffp = fopen(AFILE, "r");
624
} else {
625
conffp = fopen(argfile, "r");
626
}
627
if(conffp != NULL){
628
char *org_line = NULL;
629
char *p, *arg, *new_arg, *line;
630
size_t size = 0;
631
const char whitespace_delims[] = " \r\t\f\v\n";
632
const char comment_delim[] = "#";
633
634
custom_argc = 1;
635
custom_argv = malloc(sizeof(char*) * 2);
636
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
639
goto fallback;
640
}
641
custom_argv[0] = argv[0];
642
custom_argv[1] = NULL;
643
644
/* for each line in the config file, strip whitespace and ignore
645
commented text */
646
while(true){
647
sret = getline(&org_line, &size, conffp);
648
if(sret == -1){
649
break;
650
}
651
652
line = org_line;
653
arg = strsep(&line, comment_delim);
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
655
if(p[0] == '\0'){
656
continue;
657
}
658
new_arg = strdup(p);
659
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
662
free(org_line);
663
goto fallback;
664
}
665
666
custom_argc += 1;
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
672
free(org_line);
673
goto fallback;
674
}
675
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
677
}
678
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
free(org_line);
688
} else {
689
/* Check for harmful errors and go to fallback. Other errors might
690
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
694
goto fallback;
695
}
696
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
699
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
714
goto fallback;
715
}
716
}
717
718
/* Parse actual command line arguments, to let them override the
719
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
734
goto fallback;
735
}
202
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
736
203
737
204
if(debug){
738
205
for(plugin *p = plugin_list; p != NULL; p=p->next){
739
206
fprintf(stderr, "Plugin: %s has %d arguments\n",
740
p->name ? p->name : "Global", p->argc - 1);
207
p->name ? p->name : "Global", p->argc);
741
208
for(char **a = p->argv; *a != NULL; a++){
742
209
fprintf(stderr, "\tArg: %s\n", *a);
743
210
}
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
745
for(char **a = p->environ; *a != NULL; a++){
746
fprintf(stderr, "\t%s\n", *a);
747
}
748
}
749
}
750
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
ret = setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
778
ret = setuid(uid);
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
211
}
212
}
213
214
dir = opendir(plugindir);
784
215
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
826
}
216
/* Set the FD_CLOEXEC flag on the directory */
217
int fd = dirfd(dir);
218
ret = fcntl (fd, F_GETFD, 0);
219
if(ret < 0){
220
perror("fcntl F_GETFD");
221
goto end;
222
}
223
ret = fcntl(fd, F_SETFD, FD_CLOEXEC | ret);
224
if(ret < 0){
225
perror("fcntl F_SETFD");
226
goto end;
227
}
228
}
229
230
if(dir == NULL){
231
fprintf(stderr, "Can not open directory\n");
232
return EXIT_FAILURE;
827
233
}
828
234
829
235
FD_ZERO(&rfds_all);
830
236
831
/* Read and execute any executable in the plugin directory*/
832
237
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
238
dirst = readdir(dir);
836
239
837
/* All directory entries have been processed */
240
// All directory entries have been processed
838
241
if(dirst == NULL){
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
842
goto fallback;
843
}
844
242
break;
845
243
}
846
244
847
245
d_name_len = strlen(dirst->d_name);
848
246
849
/* Ignore dotfiles, backup files and other junk */
247
// Ignore dotfiles, backup files and other junk
850
248
{
851
249
bool bad_name = false;
852
250
853
const char * const bad_prefixes[] = { ".", "#", NULL };
251
const char const *bad_prefixes[] = { ".", "#", NULL };
854
252
855
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
253
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
856
254
".dpkg-old",
857
".dpkg-bak",
858
255
".dpkg-divert", NULL };
859
#pragma GCC diagnostic push
860
#pragma GCC diagnostic ignored "-Wcast-qual"
861
for(const char **pre = (const char **)bad_prefixes;
862
*pre != NULL; pre++){
863
#pragma GCC diagnostic pop
256
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
864
257
size_t pre_len = strlen(*pre);
865
258
if((d_name_len >= pre_len)
866
259
and strncmp((dirst->d_name), *pre, pre_len) == 0){
867
260
if(debug){
868
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
261
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
869
262
" with bad prefix %s\n", dirst->d_name, *pre);
870
263
}
871
264
bad_name = true;
872
265
break;
873
266
}
874
267
}
268
875
269
if(bad_name){
876
270
continue;
877
271
}
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
for(const char **suf = (const char **)bad_suffixes;
881
*suf != NULL; suf++){
882
#pragma GCC diagnostic pop
272
273
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
883
274
size_t suf_len = strlen(*suf);
884
275
if((d_name_len >= suf_len)
885
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
276
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
886
277
== 0)){
887
278
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
279
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
889
280
" with bad suffix %s\n", dirst->d_name, *suf);
890
281
}
891
282
bad_name = true;
898
289
}
899
290
}
900
291
901
char *filename;
902
if(plugindir == NULL){
903
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
904
dirst->d_name));
905
} else {
906
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
907
plugindir,
908
dirst->d_name));
909
}
910
if(ret < 0){
911
error(0, errno, "asprintf");
912
continue;
913
}
914
915
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
free(filename);
919
continue;
920
}
921
922
/* Ignore non-executable files */
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
292
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
293
if (filename == NULL){
294
perror("malloc");
295
exitstatus =EXIT_FAILURE;
296
goto end;
297
}
298
strcpy(filename, plugindir);
299
strcat(filename, "/");
300
strcat(filename, dirst->d_name);
301
302
stat(filename, &st);
303
304
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
925
305
if(debug){
926
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
306
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
927
307
" with bad type or mode\n", filename);
928
308
}
929
free(filename);
930
continue;
931
}
932
933
plugin *p = getplugin(dirst->d_name);
934
if(p == NULL){
935
error(0, errno, "getplugin");
936
free(filename);
937
continue;
938
}
939
if(p->disabled){
309
continue;
310
}
311
if(getplugin(dirst->d_name, &plugin_list)->disabled){
940
312
if(debug){
941
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
313
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
942
314
dirst->d_name);
943
315
}
944
free(filename);
945
316
continue;
946
317
}
947
{
948
/* Add global arguments to argument list for this plugin */
949
plugin *g = getplugin(NULL);
950
if(g != NULL){
951
for(char **a = g->argv + 1; *a != NULL; a++){
952
if(not add_argument(p, *a)){
953
error(0, errno, "add_argument");
954
}
955
}
956
/* Add global environment variables */
957
for(char **e = g->environ; *e != NULL; e++){
958
if(not add_environment(p, *e, false)){
959
error(0, errno, "add_environment");
960
}
961
}
962
}
963
}
964
/* If this plugin has any environment variables, we will call
965
using execve and need to duplicate the environment from this
966
process, too. */
967
if(p->environ[0] != NULL){
968
for(char **e = environ; *e != NULL; e++){
969
if(not add_environment(p, *e, false)){
970
error(0, errno, "add_environment");
971
}
972
}
973
}
974
975
int pipefd[2];
976
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
977
if(ret == -1){
978
error(0, errno, "pipe");
979
exitstatus = EX_OSERR;
980
goto fallback;
981
}
982
/* Ask OS to automatic close the pipe on exec */
983
ret = set_cloexec_flag(pipefd[0]);
984
if(ret < 0){
985
error(0, errno, "set_cloexec_flag");
986
exitstatus = EX_OSERR;
987
goto fallback;
988
}
989
ret = set_cloexec_flag(pipefd[1]);
990
if(ret < 0){
991
error(0, errno, "set_cloexec_flag");
992
exitstatus = EX_OSERR;
993
goto fallback;
994
}
995
/* Block SIGCHLD until process is safely in process list */
996
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
997
&sigchld_action.sa_mask,
998
NULL));
999
if(ret < 0){
1000
error(0, errno, "sigprocmask");
1001
exitstatus = EX_OSERR;
1002
goto fallback;
1003
}
1004
/* Starting a new process to be watched */
1005
pid_t pid;
1006
do {
1007
pid = fork();
1008
} while(pid == -1 and errno == EINTR);
1009
if(pid == -1){
1010
error(0, errno, "fork");
1011
exitstatus = EX_OSERR;
1012
goto fallback;
1013
}
318
// Starting a new process to be watched
319
int pipefd[2];
320
ret = pipe(pipefd);
321
if (ret == -1){
322
perror(argv[0]);
323
goto end;
324
}
325
pid_t pid = fork();
1014
326
if(pid == 0){
1015
327
/* this is the child process */
1016
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1017
if(ret < 0){
1018
error(0, errno, "sigaction");
1019
_exit(EX_OSERR);
1020
}
1021
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
if(ret < 0){
1023
error(0, errno, "sigprocmask");
1024
_exit(EX_OSERR);
1025
}
1026
1027
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1028
if(ret == -1){
1029
error(0, errno, "dup2");
1030
_exit(EX_OSERR);
1031
}
1032
1033
if(dirfd(dir) < 0){
1034
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1035
above and must now close it manually here. */
1036
closedir(dir);
1037
}
1038
if(p->environ[0] == NULL){
1039
if(execv(filename, p->argv) < 0){
1040
error(0, errno, "execv for %s", filename);
1041
_exit(EX_OSERR);
1042
}
1043
} else {
1044
if(execve(filename, p->argv, p->environ) < 0){
1045
error(0, errno, "execve for %s", filename);
1046
_exit(EX_OSERR);
1047
}
328
closedir(dir);
329
close(pipefd[0]); /* close unused read end of pipe */
330
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
331
332
plugin *p = getplugin(dirst->d_name, &plugin_list);
333
plugin *g = getplugin(NULL, &plugin_list);
334
for(char **a = g->argv + 1; *a != NULL; a++){
335
addargument(p, *a);
336
}
337
if(execv(filename, p->argv) < 0){
338
perror(argv[0]);
339
close(pipefd[1]);
340
_exit(EXIT_FAILURE);
1048
341
}
1049
342
/* no return */
1050
343
}
1051
/* Parent process */
1052
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1053
pipe */
1054
free(filename);
1055
plugin *new_plugin = getplugin(dirst->d_name);
1056
if(new_plugin == NULL){
1057
error(0, errno, "getplugin");
1058
ret = (int)(TEMP_FAILURE_RETRY
1059
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1060
NULL)));
1061
if(ret < 0){
1062
error(0, errno, "sigprocmask");
1063
}
1064
exitstatus = EX_OSERR;
1065
goto fallback;
1066
}
1067
1068
new_plugin->pid = pid;
1069
new_plugin->fd = pipefd[0];
1070
1071
/* Unblock SIGCHLD so signal handler can be run if this process
1072
has already completed */
1073
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1074
&sigchld_action.sa_mask,
1075
NULL));
1076
if(ret < 0){
1077
error(0, errno, "sigprocmask");
1078
exitstatus = EX_OSERR;
1079
goto fallback;
1080
}
1081
1082
#if defined (__GNUC__) and defined (__GLIBC__)
1083
#if not __GLIBC_PREREQ(2, 16)
1084
#pragma GCC diagnostic push
1085
#pragma GCC diagnostic ignored "-Wsign-conversion"
1086
#endif
1087
#endif
1088
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1089
-Wconversion in GNU libc
1090
before 2.16 */
1091
#if defined (__GNUC__) and defined (__GLIBC__)
1092
#if not __GLIBC_PREREQ(2, 16)
1093
#pragma GCC diagnostic pop
1094
#endif
1095
#endif
1096
1097
if(maxfd < new_plugin->fd){
1098
maxfd = new_plugin->fd;
1099
}
1100
}
1101
1102
TEMP_FAILURE_RETRY(closedir(dir));
1103
dir = NULL;
1104
free_plugin(getplugin(NULL));
1105
1106
for(plugin *p = plugin_list; p != NULL; p = p->next){
1107
if(p->pid != 0){
344
close(pipefd[1]); /* close unused write end of pipe */
345
process *new_process = malloc(sizeof(process));
346
if (new_process == NULL){
347
perror("malloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
352
new_process->fd = pipefd[0];
353
new_process->buffer = malloc(BUFFER_SIZE);
354
if (new_process->buffer == NULL){
355
perror("malloc");
356
exitstatus = EXIT_FAILURE;
357
goto end;
358
}
359
new_process->buffer_size = BUFFER_SIZE;
360
new_process->buffer_length = 0;
361
FD_SET(new_process->fd, &rfds_all);
362
363
if (maxfd < new_process->fd){
364
maxfd = new_process->fd;
365
}
366
367
//List handling
368
new_process->next = process_list;
369
process_list = new_process;
370
}
371
372
closedir(dir);
373
374
if (process_list != NULL){
375
while(true){
376
fd_set rfds = rfds_all;
377
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
378
if (select_ret == -1){
379
perror(argv[0]);
380
goto end;
381
}else{
382
for(process *process_itr = process_list; process_itr != NULL;
383
process_itr = process_itr->next){
384
if(FD_ISSET(process_itr->fd, &rfds)){
385
if(process_itr->buffer_length + BUFFER_SIZE
386
> process_itr->buffer_size){
387
process_itr->buffer = realloc(process_itr->buffer,
388
process_itr->buffer_size
389
+ (size_t) BUFFER_SIZE);
390
if (process_itr->buffer == NULL){
391
perror(argv[0]);
392
goto end;
393
}
394
process_itr->buffer_size += BUFFER_SIZE;
395
}
396
ret = read(process_itr->fd, process_itr->buffer
397
+ process_itr->buffer_length, BUFFER_SIZE);
398
if(ret < 0){
399
/* Read error from this process; ignore it */
400
continue;
401
}
402
process_itr->buffer_length += (size_t) ret;
403
if(ret == 0){
404
/* got EOF */
405
/* wait for process exit */
406
int status;
407
waitpid(process_itr->pid, &status, 0);
408
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
409
for(size_t written = 0;
410
written < process_itr->buffer_length;){
411
ret = write(STDOUT_FILENO,
412
process_itr->buffer + written,
413
process_itr->buffer_length - written);
414
if(ret < 0){
415
perror(argv[0]);
416
goto end;
417
}
418
written += (size_t)ret;
419
}
420
goto end;
421
} else {
422
FD_CLR(process_itr->fd, &rfds_all);
423
}
424
}
425
}
426
}
427
}
428
}
429
}
430
431
end:
432
for(process *process_itr = process_list; process_itr != NULL;
433
process_itr = process_itr->next){
434
close(process_itr->fd);
435
kill(process_itr->pid, SIGTERM);
436
free(process_itr->buffer);
437
}
438
439
while(true){
440
int status;
441
ret = wait(&status);
442
if (ret == -1){
443
if(errno != ECHILD){
444
perror("wait");
445
}
1108
446
break;
1109
447
}
1110
if(p->next == NULL){
1111
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1112
" directory?\n");
1113
free_plugin_list();
1114
}
1115
}
1116
1117
/* Main loop while running plugins exist */
1118
while(plugin_list){
1119
fd_set rfds = rfds_all;
1120
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1121
if(select_ret == -1 and errno != EINTR){
1122
error(0, errno, "select");
1123
exitstatus = EX_OSERR;
1124
goto fallback;
1125
}
1126
/* OK, now either a process completed, or something can be read
1127
from one of them */
1128
for(plugin *proc = plugin_list; proc != NULL;){
1129
/* Is this process completely done? */
1130
if(proc->completed and proc->eof){
1131
/* Only accept the plugin output if it exited cleanly */
1132
if(not WIFEXITED(proc->status)
1133
or WEXITSTATUS(proc->status) != 0){
1134
/* Bad exit by plugin */
1135
1136
if(debug){
1137
if(WIFEXITED(proc->status)){
1138
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1139
" status %d\n", proc->name,
1140
(intmax_t) (proc->pid),
1141
WEXITSTATUS(proc->status));
1142
} else if(WIFSIGNALED(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1144
" signal %d: %s\n", proc->name,
1145
(intmax_t) (proc->pid),
1146
WTERMSIG(proc->status),
1147
strsignal(WTERMSIG(proc->status)));
1148
} else if(WCOREDUMP(proc->status)){
1149
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1150
" core\n", proc->name, (intmax_t) (proc->pid));
1151
}
1152
}
1153
1154
/* Remove the plugin */
1155
#if defined (__GNUC__) and defined (__GLIBC__)
1156
#if not __GLIBC_PREREQ(2, 16)
1157
#pragma GCC diagnostic push
1158
#pragma GCC diagnostic ignored "-Wsign-conversion"
1159
#endif
1160
#endif
1161
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1162
-Wconversion in GNU libc
1163
before 2.16 */
1164
#if defined (__GNUC__) and defined (__GLIBC__)
1165
#if not __GLIBC_PREREQ(2, 16)
1166
#pragma GCC diagnostic pop
1167
#endif
1168
#endif
1169
1170
/* Block signal while modifying process_list */
1171
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1172
(SIG_BLOCK,
1173
&sigchld_action.sa_mask,
1174
NULL));
1175
if(ret < 0){
1176
error(0, errno, "sigprocmask");
1177
exitstatus = EX_OSERR;
1178
goto fallback;
1179
}
1180
1181
plugin *next_plugin = proc->next;
1182
free_plugin(proc);
1183
proc = next_plugin;
1184
1185
/* We are done modifying process list, so unblock signal */
1186
ret = (int)(TEMP_FAILURE_RETRY
1187
(sigprocmask(SIG_UNBLOCK,
1188
&sigchld_action.sa_mask, NULL)));
1189
if(ret < 0){
1190
error(0, errno, "sigprocmask");
1191
exitstatus = EX_OSERR;
1192
goto fallback;
1193
}
1194
1195
if(plugin_list == NULL){
1196
break;
1197
}
1198
1199
continue;
1200
}
1201
1202
/* This process exited nicely, so print its buffer */
1203
1204
bool bret = print_out_password(proc->buffer,
1205
proc->buffer_length);
1206
if(not bret){
1207
error(0, errno, "print_out_password");
1208
exitstatus = EX_IOERR;
1209
}
1210
goto fallback;
1211
}
1212
1213
/* This process has not completed. Does it have any output? */
1214
#if defined (__GNUC__) and defined (__GLIBC__)
1215
#if not __GLIBC_PREREQ(2, 16)
1216
#pragma GCC diagnostic push
1217
#pragma GCC diagnostic ignored "-Wsign-conversion"
1218
#endif
1219
#endif
1220
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1221
warning from
1222
-Wconversion
1223
in GNU libc
1224
before
1225
2.16 */
1226
#if defined (__GNUC__) and defined (__GLIBC__)
1227
#if not __GLIBC_PREREQ(2, 16)
1228
#pragma GCC diagnostic pop
1229
#endif
1230
#endif
1231
/* This process had nothing to say at this time */
1232
proc = proc->next;
1233
continue;
1234
}
1235
/* Before reading, make the process' data buffer large enough */
1236
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1237
proc->buffer = realloc(proc->buffer, proc->buffer_size
1238
+ (size_t) BUFFER_SIZE);
1239
if(proc->buffer == NULL){
1240
error(0, errno, "malloc");
1241
exitstatus = EX_OSERR;
1242
goto fallback;
1243
}
1244
proc->buffer_size += BUFFER_SIZE;
1245
}
1246
/* Read from the process */
1247
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1248
proc->buffer
1249
+ proc->buffer_length,
1250
BUFFER_SIZE));
1251
if(sret < 0){
1252
/* Read error from this process; ignore the error */
1253
proc = proc->next;
1254
continue;
1255
}
1256
if(sret == 0){
1257
/* got EOF */
1258
proc->eof = true;
1259
} else {
1260
proc->buffer_length += (size_t) sret;
1261
}
1262
}
1263
}
1264
1265
1266
fallback:
1267
1268
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1269
and exitstatus != EX_OK)){
1270
/* Fallback if all plugins failed, none are found or an error
1271
occured */
1272
bool bret;
1273
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1274
char *passwordbuffer = getpass("Password: ");
1275
size_t len = strlen(passwordbuffer);
1276
/* Strip trailing newline */
1277
if(len > 0 and passwordbuffer[len-1] == '\n'){
1278
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1279
len--;
1280
}
1281
bret = print_out_password(passwordbuffer, len);
1282
if(not bret){
1283
error(0, errno, "print_out_password");
1284
exitstatus = EX_IOERR;
1285
}
1286
}
1287
1288
/* Restore old signal handler */
1289
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1290
if(ret == -1){
1291
error(0, errno, "sigaction");
1292
exitstatus = EX_OSERR;
1293
}
1294
1295
if(custom_argv != NULL){
1296
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1297
free(*arg);
1298
}
1299
free(custom_argv);
1300
}
1301
1302
if(dir != NULL){
1303
closedir(dir);
1304
}
1305
1306
/* Kill the processes */
1307
for(plugin *p = plugin_list; p != NULL; p = p->next){
1308
if(p->pid != 0){
1309
close(p->fd);
1310
ret = kill(p->pid, SIGTERM);
1311
if(ret == -1 and errno != ESRCH){
1312
/* Set-uid proccesses might not get closed */
1313
error(0, errno, "kill");
1314
}
1315
}
1316
}
1317
1318
/* Wait for any remaining child processes to terminate */
1319
do {
1320
ret = wait(NULL);
1321
} while(ret >= 0);
1322
if(errno != ECHILD){
1323
error(0, errno, "wait");
1324
}
1325
1326
free_plugin_list();
1327
1328
free(plugindir);
1329
free(argfile);
1330
448
}
1331
449
return exitstatus;
1332
450
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0