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- Committer: Teddy Hogeborn
- Date: 2008-08-02 10:48:24 UTC
- Revision ID: teddy@fukt.bsnet.se-20080802104824-fx0miwp9o4g9r31e
* plugbasedclient.c (struct process): New fields "eof", "completed",
and "status".
(handle_sigchld): New function.
(main): Initialize "dir" to NULL to only closedir() it if necessary.
Move "process_list" to be a global variable to be accessible
by "handle_sigchld". Make "handle_sigchld" handle SIGCHLD.
Remove redundant check for NULL "dir". Free "filename" when
no longer used. Block SIGCHLD around fork()/exec().
Restore normal signals in child. Only loop while running
processes exist. Print process buffer when the process is
done and it has emitted EOF, not when it only emits EOF.
Remove processes from list which exit non-cleanly. In
cleaning up, closedir() if necessary. Bug fix: set next
pointer correctly when freeing process list.
* plugins.d/passprompt.c (main): Do not ignore SIGQUIT.
and "status".
(handle_sigchld): New function.
(main): Initialize "dir" to NULL to only closedir() it if necessary.
Move "process_list" to be a global variable to be accessible
by "handle_sigchld". Make "handle_sigchld" handle SIGCHLD.
Remove redundant check for NULL "dir". Free "filename" when
no longer used. Block SIGCHLD around fork()/exec().
Restore normal signals in child. Only loop while running
processes exist. Print process buffer when the process is
done and it has emitted EOF, not when it only emits EOF.
Remove processes from list which exit non-cleanly. In
cleaning up, closedir() if necessary. Bug fix: set next
pointer correctly when freeing process list.
* plugins.d/passprompt.c (main): Do not ignore SIGQUIT.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
28
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
31
#include <stdbool.h> /* bool, true, false */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
38
42
#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
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
57
48
#include <errno.h> /* errno */
58
#include <argp.h> /* struct argp_option, struct
59
argp_state, struct argp,
60
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
63
#include <signal.h> /* struct sigaction, sigemptyset(),
64
sigaddset(), sigaction(),
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
76
#define BUFFER_SIZE 256
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
85
typedef struct plugin{
86
char *name; /* can be NULL or any plugin name */
87
char **argv;
88
int argc;
89
char **environ;
90
int envc;
91
bool disabled;
92
93
/* Variables used for running processes*/
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
52
53
struct process;
54
55
typedef struct process{
94
56
pid_t pid;
95
57
int fd;
96
58
char *buffer;
97
59
size_t buffer_size;
98
60
size_t buffer_length;
99
61
bool eof;
100
volatile sig_atomic_t completed;
62
bool completed;
101
63
int status;
64
struct process *next;
65
} process;
66
67
typedef struct plugin{
68
char *name; /* can be NULL or any plugin name */
69
char **argv;
70
int argc;
71
bool disabled;
102
72
struct plugin *next;
103
73
} plugin;
104
74
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))){
75
plugin *getplugin(char *name, plugin **plugin_list){
76
for (plugin *p = *plugin_list; p != NULL; p = p->next){
77
if ((p->name == name)
78
or (p->name and name and (strcmp(p->name, name) == 0))){
115
79
return p;
116
80
}
117
81
}
118
82
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
124
return NULL;
125
}
126
char *copy_name = NULL;
127
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
return NULL;
136
}
137
}
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
149
free(copy_name);
150
free(new_plugin);
151
errno = e;
152
return NULL;
153
}
154
new_plugin->argv[0] = copy_name;
83
plugin *new_plugin = malloc(sizeof(plugin));
84
if (new_plugin == NULL){
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
new_plugin->name = name;
89
new_plugin->argv = malloc(sizeof(char *) * 2);
90
if (new_plugin->argv == NULL){
91
perror("malloc");
92
exit(EXIT_FAILURE);
93
}
94
new_plugin->argv[0] = name;
155
95
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
160
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
163
free(new_plugin->argv);
164
free(new_plugin);
165
errno = e;
166
return NULL;
167
}
168
new_plugin->environ[0] = NULL;
169
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
170
99
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
100
*plugin_list = new_plugin;
172
101
return new_plugin;
173
102
}
174
103
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
static bool add_to_char_array(const char *new, char ***array,
178
int *len){
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
185
/* Malloc check */
186
if(new_array == NULL){
187
return false;
188
}
189
*array = new_array;
190
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
195
if(copy == NULL){
196
return false;
197
}
198
/* Insert the copy */
199
(*array)[*len] = copy;
200
(*len)++;
201
/* Add a new terminating NULL pointer to the last element */
202
(*array)[*len] = NULL;
203
return true;
204
}
205
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
static bool add_argument(plugin *p, const char *arg){
209
if(p == NULL){
210
return false;
211
}
212
return add_to_char_array(arg, &(p->argv), &(p->argc));
213
}
214
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
218
if(p == NULL){
219
return false;
220
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
241
return add_to_char_array(def, &(p->environ), &(p->envc));
242
}
243
244
#ifndef O_CLOEXEC
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
108
perror("malloc");
109
exit(EXIT_FAILURE);
110
}
111
p->argc++;
112
p->argv[p->argc] = NULL;
113
}
114
245
115
/*
246
116
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
117
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
118
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
119
*/
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
120
int set_cloexec_flag(int fd)
121
{
122
int ret = fcntl(fd, F_GETFD, 0);
253
123
/* If reading the flags failed, return error indication now. */
254
124
if(ret < 0){
255
125
return ret;
256
126
}
257
127
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
128
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
129
}
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
130
131
#define BUFFER_SIZE 256
132
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
265
139
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
while(true){
269
plugin *proc = plugin_list;
270
int status;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
272
if(pid == 0){
273
/* Only still running child processes */
274
break;
275
}
276
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
280
}
281
error(0, errno, "waitpid");
282
}
283
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
286
proc = proc->next;
287
}
288
if(proc == NULL){
289
/* Process not found in process list */
290
continue;
291
}
292
proc->status = status;
293
proc->completed = 1;
294
}
295
errno = old_errno;
296
}
297
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
301
ssize_t ret;
302
for(size_t written = 0; written < length; written += (size_t)ret){
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
length - written));
305
if(ret < 0){
306
return false;
307
}
308
}
309
return true;
310
}
311
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
static void free_plugin(plugin *plugin_node){
315
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->argv);
320
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(*env);
322
}
323
free(plugin_node->environ);
324
free(plugin_node->buffer);
325
326
/* Removes the plugin from the singly-linked list */
327
if(plugin_node == plugin_list){
328
/* First one - simple */
329
plugin_list = plugin_list->next;
330
} else {
331
/* Second one or later */
332
for(plugin *p = plugin_list; p != NULL; p = p->next){
333
if(p->next == plugin_node){
334
p->next = plugin_node->next;
335
break;
336
}
337
}
338
}
339
340
free(plugin_node);
341
}
342
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
346
}
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
347
153
}
348
154
349
155
int main(int argc, char *argv[]){
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
353
FILE *conffp;
354
struct dirent **direntries = NULL;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
157
size_t d_name_len;
158
DIR *dir = NULL;
159
struct dirent *dirst;
355
160
struct stat st;
356
161
fd_set rfds_all;
357
162
int ret, maxfd = 0;
358
ssize_t sret;
359
uid_t uid = 65534;
360
gid_t gid = 65534;
361
163
bool debug = false;
362
164
int exitstatus = EXIT_SUCCESS;
363
struct sigaction old_sigchld_action;
364
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
365
.sa_flags = SA_NOCLDSTOP };
366
char **custom_argv = NULL;
367
int custom_argc = 0;
368
int dir_fd = -1;
369
165
370
166
/* Establish a signal handler */
167
struct sigaction old_sigchld_action,
168
sigchld_action = { .sa_handler = handle_sigchld,
169
.sa_flags = SA_NOCLDSTOP };
371
170
sigemptyset(&sigchld_action.sa_mask);
372
171
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
376
goto fallback;
172
if(ret < 0){
173
perror("sigaddset");
174
exit(EXIT_FAILURE);
377
175
}
378
176
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
382
goto fallback;
177
if(ret < 0){
178
perror("sigaction");
179
exit(EXIT_FAILURE);
383
180
}
384
181
385
182
/* The options we understand. */
387
184
{ .name = "global-options", .key = 'g',
388
185
.arg = "OPTION[,OPTION[,...]]",
389
186
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
391
.arg = "VAR=value",
392
.doc = "Environment variable passed to all plugins" },
393
187
{ .name = "options-for", .key = 'o',
394
188
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
189
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
397
.arg = "PLUGIN:ENV=value",
398
.doc = "Environment variable passed to specified plugin" },
399
190
{ .name = "disable", .key = 'd',
400
191
.arg = "PLUGIN",
401
192
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
405
193
{ .name = "plugin-dir", .key = 128,
406
194
.arg = "DIRECTORY",
407
195
.doc = "Specify a different plugin directory", .group = 2 },
408
{ .name = "config-file", .key = 129,
409
.arg = "FILE",
410
.doc = "Specify a different configuration file", .group = 2 },
411
{ .name = "userid", .key = 130,
412
.arg = "ID", .flags = 0,
413
.doc = "User ID the plugins will run as", .group = 3 },
414
{ .name = "groupid", .key = 131,
415
.arg = "ID", .flags = 0,
416
.doc = "Group ID the plugins will run as", .group = 3 },
417
{ .name = "debug", .key = 132,
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
196
{ .name = "debug", .key = 129,
197
.doc = "Debug mode", .group = 3 },
432
198
{ .name = NULL }
433
199
};
434
200
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
441
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
447
}
448
}
449
errno = 0;
450
}
451
break;
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
456
break;
457
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
479
}
480
break;
481
case 'E': /* --env-for */
482
{
483
char *envdef = strchr(arg, ':');
484
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
499
}
500
break;
501
case 'd': /* --disable */
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
517
}
518
break;
519
case 128: /* --plugin-dir */
520
free(plugindir);
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
break;
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
break;
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
break;
551
case 132: /* --debug */
201
error_t parse_opt (int key, char *arg, struct argp_state *state) {
202
/* Get the INPUT argument from `argp_parse', which we know is a
203
pointer to our plugin list pointer. */
204
plugin **plugins = state->input;
205
switch (key) {
206
case 'g':
207
if (arg != NULL){
208
char *p = strtok(arg, ",");
209
do{
210
addargument(getplugin(NULL, plugins), p);
211
p = strtok(NULL, ",");
212
} while (p);
213
}
214
break;
215
case 'o':
216
if (arg != NULL){
217
char *name = strtok(arg, ":");
218
char *p = strtok(NULL, ":");
219
if(p){
220
p = strtok(p, ",");
221
do{
222
addargument(getplugin(name, plugins), p);
223
p = strtok(NULL, ",");
224
} while (p);
225
}
226
}
227
break;
228
case 'd':
229
if (arg != NULL){
230
getplugin(arg, plugins)->disabled = true;
231
}
232
break;
233
case 128:
234
plugindir = arg;
235
break;
236
case 129:
552
237
debug = true;
553
238
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
/* FALLTHROUGH */
587
default:
588
return ARGP_ERR_UNKNOWN;
589
}
590
return errno; /* Set to 0 at start */
591
}
592
593
/* This option parser is the same as parse_opt() above, except it
594
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
600
case 'g': /* --global-options */
601
case 'G': /* --global-env */
602
case 'o': /* --options-for */
603
case 'E': /* --env-for */
604
case 'd': /* --disable */
605
case 'e': /* --enable */
606
case 128: /* --plugin-dir */
607
break;
608
case 129: /* --config-file */
609
free(argfile);
610
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
613
}
614
break;
615
case 130: /* --userid */
616
case 131: /* --groupid */
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
622
case ARGP_KEY_ARG:
623
break;
624
default:
625
return ARGP_ERR_UNKNOWN;
626
}
627
return errno;
628
}
629
630
struct argp argp = { .options = options,
631
.parser = parse_opt_config_file,
239
case ARGP_KEY_ARG:
240
argp_usage (state);
241
break;
242
case ARGP_KEY_END:
243
break;
244
default:
245
return ARGP_ERR_UNKNOWN;
246
}
247
return 0;
248
}
249
250
plugin *plugin_list = NULL;
251
252
struct argp argp = { .options = options, .parser = parse_opt,
632
253
.args_doc = "",
633
254
.doc = "Mandos plugin runner -- Run plugins" };
634
255
635
/* Parse using parse_opt_config_file() in order to get the custom
636
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
639
NULL, NULL);
640
switch(ret){
641
case 0:
642
break;
643
case ENOMEM:
644
default:
645
errno = ret;
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
648
goto fallback;
649
case EINVAL:
650
exitstatus = EX_USAGE;
651
goto fallback;
652
}
653
654
/* Reset to the normal argument parser */
655
argp.parser = parse_opt;
656
657
/* Open the configfile if available */
658
if(argfile == NULL){
659
conffp = fopen(AFILE, "r");
660
} else {
661
conffp = fopen(argfile, "r");
662
}
663
if(conffp != NULL){
664
char *org_line = NULL;
665
char *p, *arg, *new_arg, *line;
666
size_t size = 0;
667
const char whitespace_delims[] = " \r\t\f\v\n";
668
const char comment_delim[] = "#";
669
670
custom_argc = 1;
671
custom_argv = malloc(sizeof(char*) * 2);
672
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
675
goto fallback;
676
}
677
custom_argv[0] = argv[0];
678
custom_argv[1] = NULL;
679
680
/* for each line in the config file, strip whitespace and ignore
681
commented text */
682
while(true){
683
sret = getline(&org_line, &size, conffp);
684
if(sret == -1){
685
break;
686
}
687
688
line = org_line;
689
arg = strsep(&line, comment_delim);
690
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
if(p[0] == '\0'){
692
continue;
693
}
694
new_arg = strdup(p);
695
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
698
free(org_line);
699
goto fallback;
700
}
701
702
custom_argc += 1;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
715
}
716
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
718
}
719
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
728
free(org_line);
729
} else {
730
/* Check for harmful errors and go to fallback. Other errors might
731
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
735
goto fallback;
736
}
737
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
740
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
755
goto fallback;
756
}
757
}
758
759
/* Parse actual command line arguments, to let them override the
760
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
794
}
256
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
795
257
796
258
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
259
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
260
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
261
p->name ? p->name : "Global", p->argc - 1);
800
262
for(char **a = p->argv; *a != NULL; a++){
801
263
fprintf(stderr, "\tArg: %s\n", *a);
802
264
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
804
for(char **a = p->environ; *a != NULL; a++){
805
fprintf(stderr, "\t%s\n", *a);
806
}
807
}
808
}
809
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
839
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
265
}
266
}
267
268
dir = opendir(plugindir);
269
if(dir == NULL){
270
perror("Could not open plugin dir");
271
exitstatus = EXIT_FAILURE;
272
goto end;
273
}
274
275
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
276
{
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
277
int dir_fd = dirfd(dir);
278
if(dir_fd >= 0){
279
ret = set_cloexec_flag(dir_fd);
280
if(ret < 0){
281
perror("set_cloexec_flag");
282
exitstatus = EXIT_FAILURE;
283
goto end;
890
284
}
891
285
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
902
286
}
903
287
904
288
FD_ZERO(&rfds_all);
905
289
906
/* Read and execute any executable in the plugin directory*/
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
913
continue;
914
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
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, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
290
while(true){
291
dirst = readdir(dir);
292
293
// All directory entries have been processed
294
if(dirst == NULL){
295
break;
296
}
297
298
d_name_len = strlen(dirst->d_name);
299
300
// Ignore dotfiles, backup files and other junk
301
{
302
bool bad_name = false;
303
304
const char const *bad_prefixes[] = { ".", "#", NULL };
305
306
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
307
".dpkg-old",
308
".dpkg-divert", NULL };
309
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
310
size_t pre_len = strlen(*pre);
311
if((d_name_len >= pre_len)
312
and strncmp((dirst->d_name), *pre, pre_len) == 0){
313
if(debug){
314
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
315
" with bad prefix %s\n", dirst->d_name, *pre);
316
}
317
bad_name = true;
318
break;
319
}
320
}
321
322
if(bad_name){
323
continue;
324
}
325
326
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
327
size_t suf_len = strlen(*suf);
328
if((d_name_len >= suf_len)
329
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
330
== 0)){
331
if(debug){
332
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
333
" with bad suffix %s\n", dirst->d_name, *suf);
334
}
335
bad_name = true;
336
break;
337
}
338
}
339
340
if(bad_name){
341
continue;
342
}
343
}
344
345
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
346
if (filename == NULL){
347
perror("malloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
strcpy(filename, plugindir); /* Spurious warning */
352
strcat(filename, "/"); /* Spurious warning */
353
strcat(filename, dirst->d_name); /* Spurious warning */
354
355
stat(filename, &st);
356
357
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
358
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
359
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
360
" with bad type or mode\n", filename);
932
361
}
933
close(plugin_fd);
934
free(direntries[i]);
935
continue;
936
}
937
938
plugin *p = getplugin(direntries[i]->d_name);
939
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
943
continue;
944
}
945
if(p->disabled){
362
free(filename);
363
continue;
364
}
365
if(getplugin(dirst->d_name, &plugin_list)->disabled){
946
366
if(debug){
947
367
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
368
dirst->d_name);
949
369
}
950
close(plugin_fd);
951
free(direntries[i]);
370
free(filename);
952
371
continue;
953
372
}
373
plugin *p = getplugin(dirst->d_name, &plugin_list);
954
374
{
955
375
/* Add global arguments to argument list for this plugin */
956
plugin *g = getplugin(NULL);
957
if(g != NULL){
958
for(char **a = g->argv + 1; *a != NULL; a++){
959
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
961
}
962
}
963
/* Add global environment variables */
964
for(char **e = g->environ; *e != NULL; e++){
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
967
}
968
}
969
}
970
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
973
if(p->environ[0] != NULL){
974
for(char **e = environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
977
}
978
}
979
}
980
981
int pipefd[2];
982
#ifndef O_CLOEXEC
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
987
if(ret == -1){
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
1003
/* Ask OS to automatic close the pipe on exec */
376
plugin *g = getplugin(NULL, &plugin_list);
377
for(char **a = g->argv + 1; *a != NULL; a++){
378
addargument(p, *a);
379
}
380
}
381
int pipefd[2];
382
ret = pipe(pipefd);
383
if (ret == -1){
384
perror("pipe");
385
exitstatus = EXIT_FAILURE;
386
goto end;
387
}
1004
388
ret = set_cloexec_flag(pipefd[0]);
1005
389
if(ret < 0){
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
1011
goto fallback;
390
perror("set_cloexec_flag");
391
exitstatus = EXIT_FAILURE;
392
goto end;
1012
393
}
1013
394
ret = set_cloexec_flag(pipefd[1]);
1014
395
if(ret < 0){
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
396
perror("set_cloexec_flag");
397
exitstatus = EXIT_FAILURE;
398
goto end;
1021
399
}
1022
#endif /* not O_CLOEXEC */
1023
400
/* Block SIGCHLD until process is safely in process list */
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
401
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
402
if(ret < 0){
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
1031
goto fallback;
1032
}
1033
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
1038
if(pid == -1){
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
1046
goto fallback;
1047
}
403
perror("sigprocmask");
404
exitstatus = EXIT_FAILURE;
405
goto end;
406
}
407
// Starting a new process to be watched
408
pid_t pid = fork();
1048
409
if(pid == 0){
1049
410
/* this is the child process */
1050
411
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
412
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
413
perror("sigaction");
414
_exit(EXIT_FAILURE);
1054
415
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
416
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
417
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
1059
}
1060
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
1065
}
1066
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
418
perror("sigprocmask");
419
_exit(EXIT_FAILURE);
420
}
421
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
422
423
if(dirfd(dir) < 0){
424
/* If dir has no file descriptor, we could not set FD_CLOEXEC
425
above and must now close it manually here. */
426
closedir(dir);
427
}
428
if(execv(filename, p->argv) < 0){
429
perror("execv");
430
_exit(EXIT_FAILURE);
1073
431
}
1074
432
/* no return */
1075
433
}
1076
/* Parent process */
1077
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
434
/* parent process */
435
free(filename);
436
close(pipefd[1]); /* close unused write end of pipe */
437
process *new_process = malloc(sizeof(process));
438
if (new_process == NULL){
439
perror("malloc");
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
441
if(ret < 0){
1086
error(0, errno, "sigprocmask");
442
perror("sigprocmask");
1087
443
}
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
1090
goto fallback;
444
exitstatus = EXIT_FAILURE;
445
goto end;
1091
446
}
1092
free(direntries[i]);
1093
1094
new_plugin->pid = pid;
1095
new_plugin->fd = pipefd[0];
1096
447
448
*new_process = (struct process){ .pid = pid,
449
.fd = pipefd[0],
450
.next = process_list };
451
// List handling
452
process_list = new_process;
1097
453
/* Unblock SIGCHLD so signal handler can be run if this process
1098
454
has already completed */
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
1101
NULL));
455
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1102
456
if(ret < 0){
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
1105
goto fallback;
1106
}
1107
1108
FD_SET(new_plugin->fd, &rfds_all);
1109
1110
if(maxfd < new_plugin->fd){
1111
maxfd = new_plugin->fd;
1112
}
1113
}
1114
1115
free(direntries);
1116
direntries = NULL;
1117
close(dir_fd);
1118
dir_fd = -1;
1119
free_plugin(getplugin(NULL));
1120
1121
for(plugin *p = plugin_list; p != NULL; p = p->next){
1122
if(p->pid != 0){
1123
break;
1124
}
1125
if(p->next == NULL){
1126
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1127
" directory?\n");
1128
free_plugin_list();
1129
}
1130
}
1131
1132
/* Main loop while running plugins exist */
1133
while(plugin_list){
457
perror("sigprocmask");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
462
FD_SET(new_process->fd, &rfds_all);
463
464
if (maxfd < new_process->fd){
465
maxfd = new_process->fd;
466
}
467
468
}
469
470
/* Free the plugin list */
471
for(plugin *next; plugin_list != NULL; plugin_list = next){
472
next = plugin_list->next;
473
free(plugin_list->argv);
474
free(plugin_list);
475
}
476
477
closedir(dir);
478
dir = NULL;
479
480
if (process_list == NULL){
481
fprintf(stderr, "No plugin processes started, exiting\n");
482
exitstatus = EXIT_FAILURE;
483
goto end;
484
}
485
while(process_list){
1134
486
fd_set rfds = rfds_all;
1135
487
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1136
if(select_ret == -1 and errno != EINTR){
1137
error(0, errno, "select");
1138
exitstatus = EX_OSERR;
1139
goto fallback;
488
if (select_ret == -1){
489
perror("select");
490
exitstatus = EXIT_FAILURE;
491
goto end;
1140
492
}
1141
493
/* OK, now either a process completed, or something can be read
1142
494
from one of them */
1143
for(plugin *proc = plugin_list; proc != NULL;){
495
for(process *proc = process_list; proc ; proc = proc->next){
1144
496
/* Is this process completely done? */
1145
if(proc->completed and proc->eof){
497
if(proc->eof and proc->completed){
1146
498
/* Only accept the plugin output if it exited cleanly */
1147
499
if(not WIFEXITED(proc->status)
1148
500
or WEXITSTATUS(proc->status) != 0){
1149
501
/* Bad exit by plugin */
1150
1151
502
if(debug){
1152
503
if(WIFEXITED(proc->status)){
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
1156
WEXITSTATUS(proc->status));
1157
} else if(WIFSIGNALED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1159
" signal %d: %s\n", proc->name,
1160
(intmax_t) (proc->pid),
1161
WTERMSIG(proc->status),
1162
strsignal(WTERMSIG(proc->status)));
504
fprintf(stderr, "Plugin %d exited with status %d\n",
505
proc->pid, WEXITSTATUS(proc->status));
506
} else if(WIFSIGNALED(proc->status)) {
507
fprintf(stderr, "Plugin %d killed by signal %d\n",
508
proc->pid, WTERMSIG(proc->status));
509
} else if(WCOREDUMP(proc->status)){
510
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1163
511
}
1164
512
}
1165
1166
513
/* Remove the plugin */
1167
514
FD_CLR(proc->fd, &rfds_all);
1168
1169
515
/* Block signal while modifying process_list */
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
(SIG_BLOCK,
1172
&sigchld_action.sa_mask,
1173
NULL));
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1174
517
if(ret < 0){
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
1177
goto fallback;
1178
}
1179
1180
plugin *next_plugin = proc->next;
1181
free_plugin(proc);
1182
proc = next_plugin;
1183
518
perror("sigprocmask");
519
exitstatus = EXIT_FAILURE;
520
goto end;
521
}
522
/* Delete this process entry from the list */
523
if(process_list == proc){
524
/* First one - simple */
525
process_list = proc->next;
526
} else {
527
/* Second one or later */
528
for(process *p = process_list; p != NULL; p = p->next){
529
if(p->next == proc){
530
p->next = proc->next;
531
break;
532
}
533
}
534
}
1184
535
/* We are done modifying process list, so unblock signal */
1185
ret = (int)(TEMP_FAILURE_RETRY
1186
(sigprocmask(SIG_UNBLOCK,
1187
&sigchld_action.sa_mask, NULL)));
536
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
537
NULL);
1188
538
if(ret < 0){
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
1191
goto fallback;
1192
}
1193
1194
if(plugin_list == NULL){
1195
break;
1196
}
1197
1198
continue;
539
perror("sigprocmask");
540
}
541
free(proc->buffer);
542
free(proc);
543
/* We deleted this process from the list, so we can't go
544
proc->next. Therefore, start over from the beginning of
545
the process list */
546
break;
1199
547
}
1200
1201
548
/* This process exited nicely, so print its buffer */
1202
1203
bool bret = print_out_password(proc->buffer,
1204
proc->buffer_length);
1205
if(not bret){
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
549
for(size_t written = 0; written < proc->buffer_length;
550
written += (size_t)ret){
551
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
552
proc->buffer + written,
553
proc->buffer_length
554
- written));
555
if(ret < 0){
556
perror("write");
557
exitstatus = EXIT_FAILURE;
558
goto end;
559
}
1208
560
}
1209
goto fallback;
561
goto end;
1210
562
}
1211
1212
563
/* This process has not completed. Does it have any output? */
1213
564
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1214
565
/* This process had nothing to say at this time */
1215
proc = proc->next;
1216
566
continue;
1217
567
}
1218
568
/* Before reading, make the process' data buffer large enough */
1219
569
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1220
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1221
+ (size_t) BUFFER_SIZE);
1222
if(new_buffer == NULL){
1223
error(0, errno, "malloc");
1224
exitstatus = EX_OSERR;
1225
goto fallback;
570
proc->buffer = realloc(proc->buffer, proc->buffer_size
571
+ (size_t) BUFFER_SIZE);
572
if (proc->buffer == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
575
goto end;
1226
576
}
1227
proc->buffer = new_buffer;
1228
577
proc->buffer_size += BUFFER_SIZE;
1229
578
}
1230
579
/* Read from the process */
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
proc->buffer
1233
+ proc->buffer_length,
1234
BUFFER_SIZE));
1235
if(sret < 0){
580
ret = read(proc->fd, proc->buffer + proc->buffer_length,
581
BUFFER_SIZE);
582
if(ret < 0){
1236
583
/* Read error from this process; ignore the error */
1237
proc = proc->next;
1238
584
continue;
1239
585
}
1240
if(sret == 0){
586
if(ret == 0){
1241
587
/* got EOF */
1242
588
proc->eof = true;
1243
589
} else {
1244
proc->buffer_length += (size_t) sret;
590
proc->buffer_length += (size_t) ret;
1245
591
}
1246
592
}
1247
593
}
1248
1249
1250
fallback:
1251
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
1254
/* Fallback if all plugins failed, none are found or an error
1255
occured */
1256
bool bret;
1257
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1258
char *passwordbuffer = getpass("Password: ");
1259
size_t len = strlen(passwordbuffer);
1260
/* Strip trailing newline */
1261
if(len > 0 and passwordbuffer[len-1] == '\n'){
1262
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1263
len--;
1264
}
1265
bret = print_out_password(passwordbuffer, len);
1266
if(not bret){
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
1269
}
594
if(process_list == NULL){
595
fprintf(stderr, "All plugin processes failed, exiting\n");
596
exitstatus = EXIT_FAILURE;
1270
597
}
1271
598
599
end:
1272
600
/* Restore old signal handler */
1273
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1274
if(ret == -1){
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
1277
}
1278
1279
if(custom_argv != NULL){
1280
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1281
free(*arg);
1282
}
1283
free(custom_argv);
1284
}
1285
1286
free(direntries);
1287
1288
if(dir_fd != -1){
1289
close(dir_fd);
1290
}
1291
1292
/* Kill the processes */
1293
for(plugin *p = plugin_list; p != NULL; p = p->next){
1294
if(p->pid != 0){
1295
close(p->fd);
1296
ret = kill(p->pid, SIGTERM);
1297
if(ret == -1 and errno != ESRCH){
1298
/* Set-uid proccesses might not get closed */
1299
error(0, errno, "kill");
1300
}
1301
}
601
sigaction(SIGCHLD, &old_sigchld_action, NULL);
602
603
/* Free the plugin list */
604
for(plugin *next; plugin_list != NULL; plugin_list = next){
605
next = plugin_list->next;
606
free(plugin_list->argv);
607
free(plugin_list);
608
}
609
610
if(dir != NULL){
611
closedir(dir);
612
}
613
614
/* Free the process list and kill the processes */
615
for(process *next; process_list != NULL; process_list = next){
616
next = process_list->next;
617
close(process_list->fd);
618
kill(process_list->pid, SIGTERM);
619
free(process_list->buffer);
620
free(process_list);
1302
621
}
1303
622
1304
623
/* Wait for any remaining child processes to terminate */
1305
do {
624
do{
1306
625
ret = wait(NULL);
1307
626
} while(ret >= 0);
1308
627
if(errno != ECHILD){
1309
error(0, errno, "wait");
628
perror("wait");
1310
629
}
1311
630
1312
free_plugin_list();
1313
1314
free(plugindir);
1315
free(pluginhelperdir);
1316
free(argfile);
1317
1318
631
return exitstatus;
1319
632
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0