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- Committer: Björn Påhlsson
- Date: 2008-08-25 01:40:19 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825014019-p8ji8qn1bga4koao
transformed a function to a part of main
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- 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,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#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
66
76
67
#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>";
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
84
86
85
87
typedef struct plugin{
86
88
char *name; /* can be NULL or any plugin name */
89
91
char **environ;
90
92
int envc;
91
93
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
94
struct plugin *next;
103
95
} plugin;
104
96
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))){
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
115
101
return p;
116
102
}
117
103
}
118
104
/* 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){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
124
107
return NULL;
125
108
}
126
109
char *copy_name = NULL;
127
110
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
131
112
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
113
return NULL;
136
114
}
137
115
}
138
116
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
143
122
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;
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
149
125
free(copy_name);
150
126
free(new_plugin);
151
errno = e;
152
127
return NULL;
153
128
}
154
129
new_plugin->argv[0] = copy_name;
155
130
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
160
133
if(new_plugin->environ == NULL){
161
int e = errno;
162
134
free(copy_name);
163
135
free(new_plugin->argv);
164
136
free(new_plugin);
165
errno = e;
166
137
return NULL;
167
138
}
168
139
new_plugin->environ[0] = NULL;
169
170
140
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
172
142
return new_plugin;
173
143
}
174
144
175
145
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
146
static bool add_to_char_array(const char *new, char ***array,
178
147
int *len){
179
148
/* 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);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
185
151
/* Malloc check */
186
if(new_array == NULL){
152
if(*array == NULL){
187
153
return false;
188
154
}
189
*array = new_array;
190
155
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
195
157
if(copy == NULL){
196
158
return false;
197
159
}
204
166
}
205
167
206
168
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
169
static bool add_argument(plugin *p, const char *arg){
209
170
if(p == NULL){
210
171
return false;
213
174
}
214
175
215
176
/* 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){
177
static bool add_environment(plugin *p, const char *def){
218
178
if(p == NULL){
219
179
return false;
220
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
242
182
}
243
183
244
#ifndef O_CLOEXEC
184
245
185
/*
246
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
187
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
189
*/
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));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
253
193
/* If reading the flags failed, return error indication now. */
254
194
if(ret < 0){
255
195
return ret;
256
196
}
257
197
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
199
}
261
#endif /* not O_CLOEXEC */
262
200
201
process *process_list = NULL;
263
202
264
203
/* Mark processes as completed when they exit, and save their exit
265
204
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
268
206
while(true){
269
plugin *proc = plugin_list;
207
process *proc = process_list;
270
208
int status;
271
209
pid_t pid = waitpid(-1, &status, WNOHANG);
272
210
if(pid == 0){
274
212
break;
275
213
}
276
214
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
215
if (errno != ECHILD){
216
perror("waitpid");
280
217
}
281
error(0, errno, "waitpid");
218
/* No child processes */
219
break;
282
220
}
283
221
284
222
/* A child exited, find it in process_list */
285
223
while(proc != NULL and proc->pid != pid){
286
224
proc = proc->next;
290
228
continue;
291
229
}
292
230
proc->status = status;
293
proc->completed = 1;
231
proc->completed = true;
294
232
}
295
errno = old_errno;
296
233
}
297
234
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){
235
bool print_out_password(const char *buffer, size_t length){
301
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
302
240
for(size_t written = 0; written < length; written += (size_t)ret){
303
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
242
length - written));
309
247
return true;
310
248
}
311
249
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)+1; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->name);
320
free(plugin_node->argv);
321
for(char **env = plugin_node->environ; *env != NULL; env++){
322
free(*env);
323
}
324
free(plugin_node->environ);
325
free(plugin_node->buffer);
326
327
/* Removes the plugin from the singly-linked list */
328
if(plugin_node == plugin_list){
329
/* First one - simple */
330
plugin_list = plugin_list->next;
331
} else {
332
/* Second one or later */
333
for(plugin *p = plugin_list; p != NULL; p = p->next){
334
if(p->next == plugin_node){
335
p->next = plugin_node->next;
336
break;
337
}
338
}
339
}
340
341
free(plugin_node);
342
}
343
344
static void free_plugin_list(void){
345
while(plugin_list != NULL){
346
free_plugin(plugin_list);
250
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
347
262
}
348
263
}
349
264
350
265
int main(int argc, char *argv[]){
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
char *argfile = NULL;
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
354
268
FILE *conffp;
355
struct dirent **direntries = NULL;
269
size_t d_name_len;
270
DIR *dir = NULL;
271
struct dirent *dirst;
356
272
struct stat st;
357
273
fd_set rfds_all;
358
274
int ret, maxfd = 0;
359
ssize_t sret;
360
275
uid_t uid = 65534;
361
276
gid_t gid = 65534;
362
277
bool debug = false;
366
281
.sa_flags = SA_NOCLDSTOP };
367
282
char **custom_argv = NULL;
368
283
int custom_argc = 0;
369
int dir_fd = -1;
370
284
371
285
/* Establish a signal handler */
372
286
sigemptyset(&sigchld_action.sa_mask);
373
287
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
288
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
289
perror("sigaddset");
290
exitstatus = EXIT_FAILURE;
377
291
goto fallback;
378
292
}
379
293
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
294
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
295
perror("sigaction");
296
exitstatus = EXIT_FAILURE;
383
297
goto fallback;
384
298
}
385
299
388
302
{ .name = "global-options", .key = 'g',
389
303
.arg = "OPTION[,OPTION[,...]]",
390
304
.doc = "Options passed to all plugins" },
391
{ .name = "global-env", .key = 'G',
305
{ .name = "global-envs", .key = 'e',
392
306
.arg = "VAR=value",
393
307
.doc = "Environment variable passed to all plugins" },
394
308
{ .name = "options-for", .key = 'o',
395
309
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
396
310
.doc = "Options passed only to specified plugin" },
397
{ .name = "env-for", .key = 'E',
311
{ .name = "envs-for", .key = 'f',
398
312
.arg = "PLUGIN:ENV=value",
399
313
.doc = "Environment variable passed to specified plugin" },
400
314
{ .name = "disable", .key = 'd',
401
315
.arg = "PLUGIN",
402
316
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
406
317
{ .name = "plugin-dir", .key = 128,
407
318
.arg = "DIRECTORY",
408
319
.doc = "Specify a different plugin directory", .group = 2 },
409
{ .name = "config-file", .key = 129,
410
.arg = "FILE",
411
.doc = "Specify a different configuration file", .group = 2 },
412
{ .name = "userid", .key = 130,
413
.arg = "ID", .flags = 0,
414
.doc = "User ID the plugins will run as", .group = 3 },
415
{ .name = "groupid", .key = 131,
416
.arg = "ID", .flags = 0,
417
.doc = "Group ID the plugins will run as", .group = 3 },
418
{ .name = "debug", .key = 132,
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
433
328
{ .name = NULL }
434
329
};
435
330
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
442
case 'g': /* --global-options */
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
448
}
449
}
450
errno = 0;
451
}
452
break;
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
456
}
457
break;
458
case 'o': /* --options-for */
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
477
}
478
}
479
errno = 0;
480
}
481
break;
482
case 'E': /* --env-for */
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
335
switch (key) {
336
case 'g':
337
if (arg != NULL){
338
char *p;
339
while((p = strsep(&arg, ",")) != NULL){
340
if(p[0] == '\0'){
341
continue;
342
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
344
perror("add_argument");
345
return ARGP_ERR_UNKNOWN;
346
}
347
}
348
}
349
break;
350
case 'e':
351
if(arg == NULL){
352
break;
353
}
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
362
}
363
break;
364
case 'o':
365
if (arg != NULL){
366
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
368
break;
369
}
370
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
372
break;
373
}
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
}
387
break;
388
case 'f':
389
if(arg == NULL){
390
break;
391
}
483
392
{
484
393
char *envdef = strchr(arg, ':');
485
394
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
395
break;
396
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
491
401
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
499
}
500
}
501
break;
502
case 'd': /* --disable */
503
{
504
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
508
}
509
}
510
break;
511
case 'e': /* --enable */
512
{
513
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
517
}
518
}
519
break;
520
case 128: /* --plugin-dir */
521
free(plugindir);
522
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
526
break;
527
case 129: /* --config-file */
528
/* This is already done by parse_opt_config_file() */
529
break;
530
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
540
break;
541
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
551
break;
552
case 132: /* --debug */
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
410
if(p == NULL){
411
return ARGP_ERR_UNKNOWN;
412
}
413
p->disabled = true;
414
}
415
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
420
uid = (uid_t)strtol(arg, NULL, 10);
421
break;
422
case 130:
423
gid = (gid_t)strtol(arg, NULL, 10);
424
break;
425
case 131:
553
426
debug = true;
554
427
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
582
case ARGP_KEY_ARG:
583
/* Cryptsetup always passes an argument, which is an empty
584
string if "none" was specified in /etc/crypttab. So if
585
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
588
}
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
594
default:
595
return ARGP_ERR_UNKNOWN;
596
}
597
return errno; /* Set to 0 at start */
598
}
599
600
/* This option parser is the same as parse_opt() above, except it
601
ignores everything but the --config-file option. */
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
607
case 'g': /* --global-options */
608
case 'G': /* --global-env */
609
case 'o': /* --options-for */
610
case 'E': /* --env-for */
611
case 'd': /* --disable */
612
case 'e': /* --enable */
613
case 128: /* --plugin-dir */
614
break;
615
case 129: /* --config-file */
616
free(argfile);
617
argfile = strdup(arg);
618
if(argfile != NULL){
619
errno = 0;
620
}
621
break;
622
case 130: /* --userid */
623
case 131: /* --groupid */
624
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
629
case ARGP_KEY_ARG:
630
break;
631
default:
632
return ARGP_ERR_UNKNOWN;
633
}
634
return errno;
635
}
636
637
struct argp argp = { .options = options,
638
.parser = parse_opt_config_file,
639
.args_doc = "",
428
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
640
443
.doc = "Mandos plugin runner -- Run plugins" };
641
444
642
/* Parse using parse_opt_config_file() in order to get the custom
643
config file location, if any. */
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
658
goto fallback;
659
}
660
661
/* Reset to the normal argument parser */
662
argp.parser = parse_opt;
663
664
/* Open the configfile if available */
665
if(argfile == NULL){
666
conffp = fopen(AFILE, "r");
667
} else {
668
conffp = fopen(argfile, "r");
669
}
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
447
fprintf(stderr, "Unknown error while parsing arguments\n");
448
exitstatus = EXIT_FAILURE;
449
goto fallback;
450
}
451
452
conffp = fopen(argfile, "r");
670
453
if(conffp != NULL){
671
454
char *org_line = NULL;
672
455
char *p, *arg, *new_arg, *line;
673
456
size_t size = 0;
457
ssize_t sret;
674
458
const char whitespace_delims[] = " \r\t\f\v\n";
675
459
const char comment_delim[] = "#";
676
460
677
461
custom_argc = 1;
678
462
custom_argv = malloc(sizeof(char*) * 2);
679
463
if(custom_argv == NULL){
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
464
perror("malloc");
465
exitstatus = EXIT_FAILURE;
682
466
goto fallback;
683
467
}
684
468
custom_argv[0] = argv[0];
685
469
custom_argv[1] = NULL;
686
470
687
/* for each line in the config file, strip whitespace and ignore
688
commented text */
689
471
while(true){
690
472
sret = getline(&org_line, &size, conffp);
691
473
if(sret == -1){
692
474
break;
693
475
}
694
476
695
477
line = org_line;
696
478
arg = strsep(&line, comment_delim);
697
479
while((p = strsep(&arg, whitespace_delims)) != NULL){
699
481
continue;
700
482
}
701
483
new_arg = strdup(p);
702
if(new_arg == NULL){
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
484
485
custom_argc += 1;
486
custom_argv = realloc(custom_argv, sizeof(char *)
487
* ((unsigned int) custom_argc + 1));
488
if(custom_argv == NULL){
489
perror("realloc");
490
exitstatus = EXIT_FAILURE;
705
491
free(org_line);
706
492
goto fallback;
707
493
}
708
709
custom_argc += 1;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
722
}
723
494
custom_argv[custom_argc-1] = new_arg;
724
custom_argv[custom_argc] = NULL;
495
custom_argv[custom_argc] = NULL;
725
496
}
726
497
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
735
498
free(org_line);
736
} else {
499
} else{
737
500
/* Check for harmful errors and go to fallback. Other errors might
738
501
not affect opening plugins */
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
perror("fopen");
504
exitstatus = EXIT_FAILURE;
742
505
goto fallback;
743
506
}
744
507
}
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
508
747
509
if(custom_argv != NULL){
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
762
goto fallback;
763
}
764
}
765
766
/* Parse actual command line arguments, to let them override the
767
config file */
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
512
fprintf(stderr, "Unknown error while parsing arguments\n");
513
exitstatus = EXIT_FAILURE;
514
goto fallback;
800
515
}
801
516
}
802
517
803
518
if(debug){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
519
for(plugin *p = plugin_list; p != NULL; p=p->next){
805
520
fprintf(stderr, "Plugin: %s has %d arguments\n",
806
521
p->name ? p->name : "Global", p->argc - 1);
807
522
for(char **a = p->argv; *a != NULL; a++){
808
523
fprintf(stderr, "\tArg: %s\n", *a);
809
524
}
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
811
526
for(char **a = p->environ; *a != NULL; a++){
812
527
fprintf(stderr, "\t%s\n", *a);
813
528
}
814
529
}
815
530
}
816
531
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
846
532
ret = setuid(uid);
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
533
if (ret == -1){
534
perror("setuid");
535
}
536
537
setgid(gid);
538
if (ret == -1){
539
perror("setgid");
540
}
541
542
dir = opendir(plugindir);
543
if(dir == NULL){
544
perror("Could not open plugin dir");
545
exitstatus = EXIT_FAILURE;
546
goto fallback;
547
}
548
549
/* Set the FD_CLOEXEC flag on the directory, if possible */
852
550
{
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
551
int dir_fd = dirfd(dir);
552
if(dir_fd >= 0){
553
ret = set_cloexec_flag(dir_fd);
554
if(ret < 0){
555
perror("set_cloexec_flag");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
897
558
}
898
559
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
909
560
}
910
561
911
562
FD_ZERO(&rfds_all);
912
563
913
/* Read and execute any executable in the plugin directory*/
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
930
/* Ignore non-executable files */
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
564
while(true){
565
dirst = readdir(dir);
566
567
// All directory entries have been processed
568
if(dirst == NULL){
569
if (errno == EBADF){
570
perror("readdir");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
574
break;
575
}
576
577
d_name_len = strlen(dirst->d_name);
578
579
// Ignore dotfiles, backup files and other junk
580
{
581
bool bad_name = false;
582
583
const char const *bad_prefixes[] = { ".", "#", NULL };
584
585
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
".dpkg-old",
587
".dpkg-divert", NULL };
588
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
size_t pre_len = strlen(*pre);
590
if((d_name_len >= pre_len)
591
and strncmp((dirst->d_name), *pre, pre_len) == 0){
592
if(debug){
593
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
594
" with bad prefix %s\n", dirst->d_name, *pre);
595
}
596
bad_name = true;
597
break;
598
}
599
}
600
601
if(bad_name){
602
continue;
603
}
604
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
size_t suf_len = strlen(*suf);
607
if((d_name_len >= suf_len)
608
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
609
== 0)){
610
if(debug){
611
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
612
" with bad suffix %s\n", dirst->d_name, *suf);
613
}
614
bad_name = true;
615
break;
616
}
617
}
618
619
if(bad_name){
620
continue;
621
}
622
}
623
624
char *filename;
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
626
if(ret < 0){
627
perror("asprintf");
628
continue;
629
}
630
631
ret = stat(filename, &st);
632
if (ret == -1){
633
perror("stat");
634
free(filename);
635
continue;
636
}
637
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
934
639
if(debug){
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
" with bad type or mode\n", filename);
939
642
}
940
close(plugin_fd);
941
free(direntries[i]);
643
free(filename);
942
644
continue;
943
645
}
944
945
plugin *p = getplugin(direntries[i]->d_name);
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
946
647
if(p == NULL){
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
648
perror("getplugin");
649
free(filename);
950
650
continue;
951
651
}
952
652
if(p->disabled){
953
653
if(debug){
954
654
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
955
direntries[i]->d_name);
655
dirst->d_name);
956
656
}
957
close(plugin_fd);
958
free(direntries[i]);
657
free(filename);
959
658
continue;
960
659
}
961
660
{
962
661
/* Add global arguments to argument list for this plugin */
963
plugin *g = getplugin(NULL);
662
plugin *g = getplugin(NULL, &plugin_list);
964
663
if(g != NULL){
965
664
for(char **a = g->argv + 1; *a != NULL; a++){
966
665
if(not add_argument(p, *a)){
967
error(0, errno, "add_argument");
666
perror("add_argument");
968
667
}
969
668
}
970
669
/* Add global environment variables */
971
670
for(char **e = g->environ; *e != NULL; e++){
972
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
671
if(not add_environment(p, *e)){
672
perror("add_environment");
974
673
}
975
674
}
976
675
}
977
676
}
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
677
/* If this plugin has any environment variables, we will call
678
using execve and need to duplicate the environment from this
679
process, too. */
980
680
if(p->environ[0] != NULL){
981
681
for(char **e = environ; *e != NULL; e++){
982
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
688
perror("add_environment");
984
689
}
985
690
}
986
691
}
987
692
988
693
int pipefd[2];
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
1010
/* Ask OS to automatic close the pipe on exec */
694
ret = pipe(pipefd);
695
if (ret == -1){
696
perror("pipe");
697
exitstatus = EXIT_FAILURE;
698
goto fallback;
699
}
1011
700
ret = set_cloexec_flag(pipefd[0]);
1012
701
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
702
perror("set_cloexec_flag");
703
exitstatus = EXIT_FAILURE;
1018
704
goto fallback;
1019
705
}
1020
706
ret = set_cloexec_flag(pipefd[1]);
1021
707
if(ret < 0){
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
1027
710
goto fallback;
1028
711
}
1029
#endif /* not O_CLOEXEC */
1030
712
/* Block SIGCHLD until process is safely in process list */
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
714
if(ret < 0){
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
715
perror("sigprocmask");
716
exitstatus = EXIT_FAILURE;
1038
717
goto fallback;
1039
718
}
1040
/* Starting a new process to be watched */
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
719
// Starting a new process to be watched
720
pid_t pid = fork();
1045
721
if(pid == -1){
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
722
perror("fork");
723
exitstatus = EXIT_FAILURE;
1053
724
goto fallback;
1054
725
}
1055
726
if(pid == 0){
1056
727
/* this is the child process */
1057
728
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
729
if(ret < 0){
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
730
perror("sigaction");
731
_exit(EXIT_FAILURE);
1061
732
}
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1063
734
if(ret < 0){
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
735
perror("sigprocmask");
736
_exit(EXIT_FAILURE);
1066
737
}
1067
738
1068
739
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1069
740
if(ret == -1){
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
741
perror("dup2");
742
_exit(EXIT_FAILURE);
1072
743
}
1073
744
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
745
if(dirfd(dir) < 0){
746
/* If dir has no file descriptor, we could not set FD_CLOEXEC
747
above and must now close it manually here. */
748
closedir(dir);
749
}
750
if(p->environ[0] == NULL){
751
if(execv(filename, p->argv) < 0){
752
perror("execv");
753
_exit(EXIT_FAILURE);
754
}
755
} else {
756
if(execve(filename, p->argv, p->environ) < 0){
757
perror("execve");
758
_exit(EXIT_FAILURE);
759
}
1080
760
}
1081
761
/* no return */
1082
762
}
1083
/* Parent process */
1084
close(pipefd[1]); /* Close unused write end of pipe */
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
763
/* parent process */
764
free(filename);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
770
if(ret < 0){
1093
error(0, errno, "sigprocmask");
771
perror("sigprocmask");
1094
772
}
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
773
exitstatus = EXIT_FAILURE;
1097
774
goto fallback;
1098
775
}
1099
free(direntries[i]);
1100
776
1101
new_plugin->pid = pid;
1102
new_plugin->fd = pipefd[0];
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
1109
782
/* Unblock SIGCHLD so signal handler can be run if this process
1110
783
has already completed */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
785
if(ret < 0){
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
1117
788
goto fallback;
1118
789
}
1119
790
1120
FD_SET(new_plugin->fd, &rfds_all);
1121
1122
if(maxfd < new_plugin->fd){
1123
maxfd = new_plugin->fd;
1124
}
1125
}
1126
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
1134
if(p->pid != 0){
1135
break;
1136
}
1137
if(p->next == NULL){
1138
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1139
" directory?\n");
1140
free_plugin_list();
1141
}
1142
}
1143
1144
/* Main loop while running plugins exist */
1145
while(plugin_list){
791
FD_SET(new_process->fd, &rfds_all);
792
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
795
}
796
797
}
798
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
closedir(dir);
803
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
809
}
810
while(process_list){
1146
811
fd_set rfds = rfds_all;
1147
812
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
813
if (select_ret == -1){
814
perror("select");
815
exitstatus = EXIT_FAILURE;
1151
816
goto fallback;
1152
817
}
1153
818
/* OK, now either a process completed, or something can be read
1154
819
from one of them */
1155
for(plugin *proc = plugin_list; proc != NULL;){
820
for(process *proc = process_list; proc ; proc = proc->next){
1156
821
/* Is this process completely done? */
1157
if(proc->completed and proc->eof){
822
if(proc->eof and proc->completed){
1158
823
/* Only accept the plugin output if it exited cleanly */
1159
824
if(not WIFEXITED(proc->status)
1160
825
or WEXITSTATUS(proc->status) != 0){
1161
826
/* Bad exit by plugin */
1162
1163
827
if(debug){
1164
828
if(WIFEXITED(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
1168
831
WEXITSTATUS(proc->status));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
835
WTERMSIG(proc->status));
836
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
1175
839
}
1176
840
}
1177
1178
841
/* Remove the plugin */
1179
842
FD_CLR(proc->fd, &rfds_all);
1180
1181
843
/* Block signal while modifying process_list */
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1186
845
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
846
perror("sigprocmask");
847
exitstatus = EXIT_FAILURE;
1189
848
goto fallback;
1190
849
}
1191
1192
plugin *next_plugin = proc->next;
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
1196
863
/* We are done modifying process list, so unblock signal */
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1200
866
if(ret < 0){
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
1203
goto fallback;
1204
}
1205
1206
if(plugin_list == NULL){
1207
break;
1208
}
1209
1210
continue;
867
perror("sigprocmask");
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
1211
875
}
1212
1213
876
/* This process exited nicely, so print its buffer */
1214
877
1215
878
bool bret = print_out_password(proc->buffer,
1216
879
proc->buffer_length);
1217
880
if(not bret){
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
881
perror("print_out_password");
882
exitstatus = EXIT_FAILURE;
1220
883
}
1221
884
goto fallback;
1222
885
}
1223
1224
886
/* This process has not completed. Does it have any output? */
1225
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1226
888
/* This process had nothing to say at this time */
1227
proc = proc->next;
1228
889
continue;
1229
890
}
1230
891
/* Before reading, make the process' data buffer large enough */
1231
892
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
893
proc->buffer = realloc(proc->buffer, proc->buffer_size
894
+ (size_t) BUFFER_SIZE);
895
if (proc->buffer == NULL){
896
perror("malloc");
897
exitstatus = EXIT_FAILURE;
1237
898
goto fallback;
1238
899
}
1239
proc->buffer = new_buffer;
1240
900
proc->buffer_size += BUFFER_SIZE;
1241
901
}
1242
902
/* Read from the process */
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1248
906
/* Read error from this process; ignore the error */
1249
proc = proc->next;
1250
907
continue;
1251
908
}
1252
if(sret == 0){
909
if(ret == 0){
1253
910
/* got EOF */
1254
911
proc->eof = true;
1255
912
} else {
1256
proc->buffer_length += (size_t) sret;
913
proc->buffer_length += (size_t) ret;
1257
914
}
1258
915
}
1259
916
}
1260
1261
917
918
1262
919
fallback:
1263
920
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1266
922
/* Fallback if all plugins failed, none are found or an error
1267
923
occured */
1268
924
bool bret;
1269
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1270
926
char *passwordbuffer = getpass("Password: ");
1271
size_t len = strlen(passwordbuffer);
1272
/* Strip trailing newline */
1273
if(len > 0 and passwordbuffer[len-1] == '\n'){
1274
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1275
len--;
1276
}
1277
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1278
928
if(not bret){
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1281
931
}
1282
932
}
1283
933
1284
934
/* Restore old signal handler */
1285
935
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1286
936
if(ret == -1){
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
1289
939
}
1290
940
1291
941
if(custom_argv != NULL){
1292
942
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1293
943
free(*arg);
1294
944
}
1295
945
free(custom_argv);
1296
946
}
1297
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
947
free_plugin_list(plugin_list);
948
949
if(dir != NULL){
950
closedir(dir);
1302
951
}
1303
952
1304
/* Kill the processes */
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1306
if(p->pid != 0){
1307
close(p->fd);
1308
ret = kill(p->pid, SIGTERM);
1309
if(ret == -1 and errno != ESRCH){
1310
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1312
}
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");
1313
961
}
962
free(process_list->buffer);
963
free(process_list);
1314
964
}
1315
965
1316
966
/* Wait for any remaining child processes to terminate */
1317
do {
967
do{
1318
968
ret = wait(NULL);
1319
969
} while(ret >= 0);
1320
970
if(errno != ECHILD){
1321
error(0, errno, "wait");
971
perror("wait");
1322
972
}
1323
973
1324
free_plugin_list();
1325
1326
free(plugindir);
1327
free(pluginhelperdir);
1328
free(argfile);
1329
1330
974
return exitstatus;
1331
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0