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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.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
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#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() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
60
58
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
63
60
#include <signal.h> /* struct sigaction, sigemptyset(),
64
61
sigaddset(), sigaction(),
65
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
63
SIG_UNBLOCK, kill() */
68
64
#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
65
76
66
#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>";
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
84
85
85
86
typedef struct plugin{
86
87
char *name; /* can be NULL or any plugin name */
89
90
char **environ;
90
91
int envc;
91
92
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
102
93
struct plugin *next;
103
94
} plugin;
104
95
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))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
115
100
return p;
116
101
}
117
102
}
118
103
/* 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){
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
124
106
return NULL;
125
107
}
126
108
char *copy_name = NULL;
127
109
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
110
copy_name = strdup(name);
131
111
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
112
return NULL;
136
113
}
137
114
}
138
115
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
143
121
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;
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
149
124
free(copy_name);
150
125
free(new_plugin);
151
errno = e;
152
126
return NULL;
153
127
}
154
128
new_plugin->argv[0] = copy_name;
155
129
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
130
131
new_plugin->environ = malloc(sizeof(char *));
160
132
if(new_plugin->environ == NULL){
161
int e = errno;
162
133
free(copy_name);
163
134
free(new_plugin->argv);
164
135
free(new_plugin);
165
errno = e;
166
136
return NULL;
167
137
}
168
138
new_plugin->environ[0] = NULL;
169
170
139
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
172
141
return new_plugin;
173
142
}
174
143
175
144
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
145
static bool add_to_char_array(const char *new, char ***array,
178
146
int *len){
179
147
/* 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);
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
185
150
/* Malloc check */
186
if(new_array == NULL){
151
if(*array == NULL){
187
152
return false;
188
153
}
189
*array = new_array;
190
154
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
155
char *copy = strdup(new);
195
156
if(copy == NULL){
196
157
return false;
197
158
}
204
165
}
205
166
206
167
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
168
static bool add_argument(plugin *p, const char *arg){
209
169
if(p == NULL){
210
170
return false;
213
173
}
214
174
215
175
/* 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){
176
static bool add_environment(plugin *p, const char *def){
218
177
if(p == NULL){
219
178
return false;
220
179
}
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
180
return add_to_char_array(def, &(p->environ), &(p->envc));
242
181
}
243
182
244
#ifndef O_CLOEXEC
183
245
184
/*
246
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
186
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
188
*/
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));
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
253
192
/* If reading the flags failed, return error indication now. */
254
193
if(ret < 0){
255
194
return ret;
256
195
}
257
196
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
198
}
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
199
200
process *process_list = NULL;
201
202
/* Mark processes as completed when it exits, and save its exit
265
203
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
268
206
while(true){
269
plugin *proc = plugin_list;
270
207
int status;
271
208
pid_t pid = waitpid(-1, &status, WNOHANG);
272
209
if(pid == 0){
273
/* Only still running child processes */
274
210
break;
275
211
}
276
212
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
213
if (errno != ECHILD){
214
perror("waitpid");
280
215
}
281
error(0, errno, "waitpid");
216
return;
282
217
}
283
284
/* A child exited, find it in process_list */
218
285
219
while(proc != NULL and proc->pid != pid){
286
220
proc = proc->next;
287
221
}
290
224
continue;
291
225
}
292
226
proc->status = status;
293
proc->completed = 1;
227
proc->completed = true;
294
228
}
295
errno = old_errno;
296
229
}
297
230
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){
231
bool print_out_password(const char *buffer, size_t length){
301
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
302
236
for(size_t written = 0; written < length; written += (size_t)ret){
303
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
238
length - written));
309
243
return true;
310
244
}
311
245
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
}
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
337
252
}
338
}
339
340
free(plugin_node);
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
341
265
}
342
266
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
346
279
}
347
280
}
348
281
349
282
int main(int argc, char *argv[]){
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
353
285
FILE *conffp;
354
struct dirent **direntries = NULL;
286
size_t d_name_len;
287
DIR *dir = NULL;
288
struct dirent *dirst;
355
289
struct stat st;
356
290
fd_set rfds_all;
357
291
int ret, maxfd = 0;
358
ssize_t sret;
359
292
uid_t uid = 65534;
360
293
gid_t gid = 65534;
361
294
bool debug = false;
365
298
.sa_flags = SA_NOCLDSTOP };
366
299
char **custom_argv = NULL;
367
300
int custom_argc = 0;
368
int dir_fd = -1;
369
301
370
302
/* Establish a signal handler */
371
303
sigemptyset(&sigchld_action.sa_mask);
372
304
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
305
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
306
perror("sigaddset");
307
exitstatus = EXIT_FAILURE;
376
308
goto fallback;
377
309
}
378
310
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
311
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
312
perror("sigaction");
313
exitstatus = EXIT_FAILURE;
382
314
goto fallback;
383
315
}
384
316
387
319
{ .name = "global-options", .key = 'g',
388
320
.arg = "OPTION[,OPTION[,...]]",
389
321
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
391
323
.arg = "VAR=value",
392
324
.doc = "Environment variable passed to all plugins" },
393
325
{ .name = "options-for", .key = 'o',
394
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
327
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
397
329
.arg = "PLUGIN:ENV=value",
398
330
.doc = "Environment variable passed to specified plugin" },
399
331
{ .name = "disable", .key = 'd',
400
332
.arg = "PLUGIN",
401
333
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
405
334
{ .name = "plugin-dir", .key = 128,
406
335
.arg = "DIRECTORY",
407
336
.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 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
432
345
{ .name = NULL }
433
346
};
434
347
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 */
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
358
continue;
359
}
360
if(not add_argument(getplugin(NULL, plugins), p)){
361
perror("add_argument");
362
return ARGP_ERR_UNKNOWN;
363
}
364
}
365
}
366
break;
367
case 'e':
368
if(arg == NULL){
369
break;
370
}
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
379
}
380
break;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
401
}
402
}
403
}
404
break;
405
case 'f':
406
if(arg == NULL){
407
break;
408
}
482
409
{
483
410
char *envdef = strchr(arg, ':');
484
411
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
412
break;
413
}
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
490
418
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 */
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
420
perror("add_environment");
421
}
422
}
423
break;
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
427
if(p == NULL){
428
return ARGP_ERR_UNKNOWN;
429
}
430
p->disabled = true;
431
}
432
break;
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
case 131:
552
443
debug = true;
553
444
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,
632
.args_doc = "",
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
633
460
.doc = "Mandos plugin runner -- Run plugins" };
634
461
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
}
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
464
fprintf(stderr, "Unknown error while parsing arguments\n");
465
exitstatus = EXIT_FAILURE;
466
goto fallback;
467
}
468
469
conffp = fopen(argfile, "r");
663
470
if(conffp != NULL){
664
471
char *org_line = NULL;
665
472
char *p, *arg, *new_arg, *line;
666
473
size_t size = 0;
474
ssize_t sret;
667
475
const char whitespace_delims[] = " \r\t\f\v\n";
668
476
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 */
477
682
478
while(true){
683
479
sret = getline(&org_line, &size, conffp);
684
480
if(sret == -1){
685
481
break;
686
482
}
687
483
688
484
line = org_line;
689
485
arg = strsep(&line, comment_delim);
690
486
while((p = strsep(&arg, whitespace_delims)) != NULL){
692
488
continue;
693
489
}
694
490
new_arg = strdup(p);
695
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
698
free(org_line);
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
699
495
goto fallback;
700
496
}
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
497
}
719
498
}
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
499
free(org_line);
729
} else {
500
} else{
730
501
/* Check for harmful errors and go to fallback. Other errors might
731
502
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
504
perror("fopen");
505
exitstatus = EXIT_FAILURE;
735
506
goto fallback;
736
507
}
737
508
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
509
740
510
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);
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
514
fprintf(stderr, "Unknown error while parsing arguments\n");
515
exitstatus = EXIT_FAILURE;
516
goto fallback;
793
517
}
794
518
}
795
519
796
520
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
523
p->name ? p->name : "Global", p->argc - 1);
800
524
for(char **a = p->argv; *a != NULL; a++){
801
525
fprintf(stderr, "\tArg: %s\n", *a);
802
526
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
528
for(char **a = p->environ; *a != NULL; a++){
805
529
fprintf(stderr, "\t%s\n", *a);
806
530
}
807
531
}
808
532
}
809
533
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
534
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
535
if (ret == -1){
536
perror("setuid");
537
}
538
539
setgid(gid);
540
if (ret == -1){
541
perror("setgid");
542
}
543
544
dir = opendir(plugindir);
545
if(dir == NULL){
546
perror("Could not open plugin dir");
547
exitstatus = EXIT_FAILURE;
548
goto fallback;
549
}
550
551
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
552
{
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;
553
int dir_fd = dirfd(dir);
554
if(dir_fd >= 0){
555
ret = set_cloexec_flag(dir_fd);
556
if(ret < 0){
557
perror("set_cloexec_flag");
558
exitstatus = EXIT_FAILURE;
559
goto fallback;
890
560
}
891
561
}
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
562
}
903
563
904
564
FD_ZERO(&rfds_all);
905
565
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)){
566
while(true){
567
dirst = readdir(dir);
568
569
// All directory entries have been processed
570
if(dirst == NULL){
571
if (errno == EBADF){
572
perror("readdir");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
break;
577
}
578
579
d_name_len = strlen(dirst->d_name);
580
581
// Ignore dotfiles, backup files and other junk
582
{
583
bool bad_name = false;
584
585
const char const *bad_prefixes[] = { ".", "#", NULL };
586
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
588
".dpkg-old",
589
".dpkg-divert", NULL };
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
591
size_t pre_len = strlen(*pre);
592
if((d_name_len >= pre_len)
593
and strncmp((dirst->d_name), *pre, pre_len) == 0){
594
if(debug){
595
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
596
" with bad prefix %s\n", dirst->d_name, *pre);
597
}
598
bad_name = true;
599
break;
600
}
601
}
602
603
if(bad_name){
604
continue;
605
}
606
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
608
size_t suf_len = strlen(*suf);
609
if((d_name_len >= suf_len)
610
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
611
== 0)){
612
if(debug){
613
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
614
" with bad suffix %s\n", dirst->d_name, *suf);
615
}
616
bad_name = true;
617
break;
618
}
619
}
620
621
if(bad_name){
622
continue;
623
}
624
}
625
626
char *filename;
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
628
if(ret < 0){
629
perror("asprintf");
630
continue;
631
}
632
633
ret = stat(filename, &st);
634
if (ret == -1){
635
perror("stat");
636
free(filename);
637
continue;
638
}
639
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
641
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);
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
643
" with bad type or mode\n", filename);
932
644
}
933
close(plugin_fd);
934
free(direntries[i]);
645
free(filename);
935
646
continue;
936
647
}
937
938
plugin *p = getplugin(direntries[i]->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
939
649
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
650
perror("getplugin");
651
free(filename);
943
652
continue;
944
653
}
945
654
if(p->disabled){
946
655
if(debug){
947
656
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
657
dirst->d_name);
949
658
}
950
close(plugin_fd);
951
free(direntries[i]);
659
free(filename);
952
660
continue;
953
661
}
954
662
{
955
663
/* Add global arguments to argument list for this plugin */
956
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
957
665
if(g != NULL){
958
666
for(char **a = g->argv + 1; *a != NULL; a++){
959
667
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
668
perror("add_argument");
961
669
}
962
670
}
963
671
/* Add global environment variables */
964
672
for(char **e = g->environ; *e != NULL; e++){
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
673
if(not add_environment(p, *e)){
674
perror("add_environment");
967
675
}
968
676
}
969
677
}
970
678
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
679
/* If this plugin has any environment variables, we will call
680
using execve and need to duplicate the environment from this
681
process, too. */
973
682
if(p->environ[0] != NULL){
974
683
for(char **e = environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
690
perror("add_environment");
977
691
}
978
692
}
979
693
}
980
694
981
695
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 */
696
ret = pipe(pipefd);
697
if (ret == -1){
698
perror("pipe");
699
exitstatus = EXIT_FAILURE;
700
goto fallback;
701
}
1004
702
ret = set_cloexec_flag(pipefd[0]);
1005
703
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]);
704
perror("set_cloexec_flag");
705
exitstatus = EXIT_FAILURE;
1011
706
goto fallback;
1012
707
}
1013
708
ret = set_cloexec_flag(pipefd[1]);
1014
709
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]);
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
1020
712
goto fallback;
1021
713
}
1022
#endif /* not O_CLOEXEC */
1023
714
/* 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));
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
716
if(ret < 0){
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
717
perror("sigprocmask");
718
exitstatus = EXIT_FAILURE;
1031
719
goto fallback;
1032
720
}
1033
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
721
// Starting a new process to be watched
722
pid_t pid = fork();
1038
723
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]);
724
perror("fork");
725
exitstatus = EXIT_FAILURE;
1046
726
goto fallback;
1047
727
}
1048
728
if(pid == 0){
1049
729
/* this is the child process */
1050
730
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
731
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
732
perror("sigaction");
733
_exit(EXIT_FAILURE);
1054
734
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
736
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
737
perror("sigprocmask");
738
_exit(EXIT_FAILURE);
1059
739
}
1060
740
1061
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
742
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
743
perror("dup2");
744
_exit(EXIT_FAILURE);
1065
745
}
1066
746
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);
747
if(dirfd(dir) < 0){
748
/* If dir has no file descriptor, we could not set FD_CLOEXEC
749
above and must now close it manually here. */
750
closedir(dir);
751
}
752
if(p->environ[0] == NULL){
753
if(execv(filename, p->argv) < 0){
754
perror("execv");
755
_exit(EXIT_FAILURE);
756
}
757
} else {
758
if(execve(filename, p->argv, p->environ) < 0){
759
perror("execve");
760
_exit(EXIT_FAILURE);
761
}
1073
762
}
1074
763
/* no return */
1075
764
}
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)));
765
/* parent process */
766
free(filename);
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
772
if(ret < 0){
1086
error(0, errno, "sigprocmask");
773
perror("sigprocmask");
1087
774
}
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
775
exitstatus = EXIT_FAILURE;
1090
776
goto fallback;
1091
777
}
1092
free(direntries[i]);
1093
778
1094
new_plugin->pid = pid;
1095
new_plugin->fd = pipefd[0];
1096
1097
if(debug){
1098
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1099
new_plugin->name, (intmax_t) (new_plugin->pid));
1100
}
1101
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
1102
784
/* Unblock SIGCHLD so signal handler can be run if this process
1103
785
has already completed */
1104
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1105
&sigchld_action.sa_mask,
1106
NULL));
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
787
if(ret < 0){
1108
error(0, errno, "sigprocmask");
1109
exitstatus = EX_OSERR;
788
perror("sigprocmask");
789
exitstatus = EXIT_FAILURE;
1110
790
goto fallback;
1111
791
}
1112
792
1113
FD_SET(new_plugin->fd, &rfds_all);
1114
1115
if(maxfd < new_plugin->fd){
1116
maxfd = new_plugin->fd;
1117
}
1118
}
1119
1120
free(direntries);
1121
direntries = NULL;
1122
close(dir_fd);
1123
dir_fd = -1;
1124
free_plugin(getplugin(NULL));
1125
1126
for(plugin *p = plugin_list; p != NULL; p = p->next){
1127
if(p->pid != 0){
1128
break;
1129
}
1130
if(p->next == NULL){
1131
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1132
" directory?\n");
1133
free_plugin_list();
1134
}
1135
}
1136
1137
/* Main loop while running plugins exist */
1138
while(plugin_list){
793
FD_SET(new_process->fd, &rfds_all);
794
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
797
}
798
799
}
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
closedir(dir);
805
dir = NULL;
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
811
}
812
while(process_list){
1139
813
fd_set rfds = rfds_all;
1140
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1141
if(select_ret == -1 and errno != EINTR){
1142
error(0, errno, "select");
1143
exitstatus = EX_OSERR;
815
if (select_ret == -1){
816
perror("select");
817
exitstatus = EXIT_FAILURE;
1144
818
goto fallback;
1145
819
}
1146
820
/* OK, now either a process completed, or something can be read
1147
821
from one of them */
1148
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
1149
823
/* Is this process completely done? */
1150
if(proc->completed and proc->eof){
824
if(proc->eof and proc->completed){
1151
825
/* Only accept the plugin output if it exited cleanly */
1152
826
if(not WIFEXITED(proc->status)
1153
827
or WEXITSTATUS(proc->status) != 0){
1154
828
/* Bad exit by plugin */
1155
1156
829
if(debug){
1157
830
if(WIFEXITED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1159
" status %d\n", proc->name,
1160
(intmax_t) (proc->pid),
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
1161
833
WEXITSTATUS(proc->status));
1162
} else if(WIFSIGNALED(proc->status)){
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1164
" signal %d: %s\n", proc->name,
1165
(intmax_t) (proc->pid),
1166
WTERMSIG(proc->status),
1167
strsignal(WTERMSIG(proc->status)));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
837
WTERMSIG(proc->status));
838
} else if(WCOREDUMP(proc->status)){
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
1168
841
}
1169
842
}
1170
1171
843
/* Remove the plugin */
1172
844
FD_CLR(proc->fd, &rfds_all);
1173
1174
845
/* Block signal while modifying process_list */
1175
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1176
(SIG_BLOCK,
1177
&sigchld_action.sa_mask,
1178
NULL));
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1179
847
if(ret < 0){
1180
error(0, errno, "sigprocmask");
1181
exitstatus = EX_OSERR;
848
perror("sigprocmask");
849
exitstatus = EXIT_FAILURE;
1182
850
goto fallback;
1183
851
}
1184
1185
plugin *next_plugin = proc->next;
1186
free_plugin(proc);
1187
proc = next_plugin;
1188
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
1189
865
/* We are done modifying process list, so unblock signal */
1190
ret = (int)(TEMP_FAILURE_RETRY
1191
(sigprocmask(SIG_UNBLOCK,
1192
&sigchld_action.sa_mask, NULL)));
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1193
868
if(ret < 0){
1194
error(0, errno, "sigprocmask");
1195
exitstatus = EX_OSERR;
1196
goto fallback;
1197
}
1198
1199
if(plugin_list == NULL){
1200
break;
1201
}
1202
1203
continue;
869
perror("sigprocmask");
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
1204
877
}
1205
1206
878
/* This process exited nicely, so print its buffer */
1207
1208
bool bret = print_out_password(proc->buffer,
1209
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1210
881
if(not bret){
1211
error(0, errno, "print_out_password");
1212
exitstatus = EX_IOERR;
882
perror("print_out_password");
883
exitstatus = EXIT_FAILURE;
1213
884
}
1214
885
goto fallback;
1215
886
}
1216
1217
887
/* This process has not completed. Does it have any output? */
1218
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1219
889
/* This process had nothing to say at this time */
1220
proc = proc->next;
1221
890
continue;
1222
891
}
1223
892
/* Before reading, make the process' data buffer large enough */
1224
893
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1225
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1226
+ (size_t) BUFFER_SIZE);
1227
if(new_buffer == NULL){
1228
error(0, errno, "malloc");
1229
exitstatus = EX_OSERR;
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
895
+ (size_t) BUFFER_SIZE);
896
if (proc->buffer == NULL){
897
perror("malloc");
898
exitstatus = EXIT_FAILURE;
1230
899
goto fallback;
1231
900
}
1232
proc->buffer = new_buffer;
1233
901
proc->buffer_size += BUFFER_SIZE;
1234
902
}
1235
903
/* Read from the process */
1236
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1237
proc->buffer
1238
+ proc->buffer_length,
1239
BUFFER_SIZE));
1240
if(sret < 0){
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1241
907
/* Read error from this process; ignore the error */
1242
proc = proc->next;
1243
908
continue;
1244
909
}
1245
if(sret == 0){
910
if(ret == 0){
1246
911
/* got EOF */
1247
912
proc->eof = true;
1248
913
} else {
1249
proc->buffer_length += (size_t) sret;
914
proc->buffer_length += (size_t) ret;
1250
915
}
1251
916
}
1252
917
}
1253
1254
918
919
1255
920
fallback:
1256
921
1257
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1258
and exitstatus != EX_OK)){
1259
/* Fallback if all plugins failed, none are found or an error
1260
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1261
924
bool bret;
1262
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1263
926
char *passwordbuffer = getpass("Password: ");
1264
size_t len = strlen(passwordbuffer);
1265
/* Strip trailing newline */
1266
if(len > 0 and passwordbuffer[len-1] == '\n'){
1267
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1268
len--;
1269
}
1270
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1271
928
if(not bret){
1272
error(0, errno, "print_out_password");
1273
exitstatus = EX_IOERR;
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1274
931
}
1275
932
}
1276
933
1277
934
/* Restore old signal handler */
1278
935
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1279
936
if(ret == -1){
1280
error(0, errno, "sigaction");
1281
exitstatus = EX_OSERR;
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
1282
939
}
1283
940
1284
941
if(custom_argv != NULL){
1285
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1286
943
free(*arg);
1287
944
}
1288
945
free(custom_argv);
1289
946
}
1290
1291
free(direntries);
1292
1293
if(dir_fd != -1){
1294
close(dir_fd);
947
free_plugin_list(plugin_list);
948
949
if(dir != NULL){
950
closedir(dir);
1295
951
}
1296
952
1297
/* Kill the processes */
1298
for(plugin *p = plugin_list; p != NULL; p = p->next){
1299
if(p->pid != 0){
1300
close(p->fd);
1301
ret = kill(p->pid, SIGTERM);
1302
if(ret == -1 and errno != ESRCH){
1303
/* Set-uid proccesses might not get closed */
1304
error(0, errno, "kill");
1305
}
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1306
961
}
962
free(process_list->buffer);
963
free(process_list);
1307
964
}
1308
965
1309
966
/* Wait for any remaining child processes to terminate */
1310
do {
967
do{
1311
968
ret = wait(NULL);
1312
969
} while(ret >= 0);
1313
970
if(errno != ECHILD){
1314
error(0, errno, "wait");
971
perror("wait");
1315
972
}
1316
973
1317
free_plugin_list();
1318
1319
free(plugindir);
1320
free(pluginhelperdir);
1321
free(argfile);
1322
1323
974
return exitstatus;
1324
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0