To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to mandos-client.c
- browse files at revision 24.1.40
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.40
- Committer: Björn Påhlsson
- Date: 2008-08-10 18:06:45 UTC
- mfrom: (62 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 63.
- Revision ID: belorn@braxen-20080810180645-3mq1p3a8ufqnql0g
merge
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
mandos-client.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 © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
42
26
#include <stddef.h> /* size_t, NULL */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
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() */
63
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
89
66
90
67
#define BUFFER_SIZE 256
91
68
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
98
99
typedef struct plugin{
100
char *name; /* can be NULL or any plugin name */
101
char **argv;
102
int argc;
103
char **environ;
104
int envc;
105
bool disabled;
106
107
/* Variables used for running processes*/
69
const char *argp_program_version = "mandos-client 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
108
75
pid_t pid;
109
76
int fd;
110
77
char *buffer;
111
78
size_t buffer_size;
112
79
size_t buffer_length;
113
80
bool eof;
114
volatile sig_atomic_t completed;
81
bool completed;
115
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
116
91
struct plugin *next;
117
92
} plugin;
118
93
119
static plugin *plugin_list = NULL;
120
121
/* Gets an existing plugin based on name,
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
static plugin *getplugin(char *name){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
or (p->name and name and (strcmp(p->name, name) == 0))){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
129
98
return p;
130
99
}
131
100
}
132
101
/* Create a new plugin */
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
138
return NULL;
139
}
140
char *copy_name = NULL;
141
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
return NULL;
150
}
151
}
152
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
157
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
int e = errno;
163
free(copy_name);
164
free(new_plugin);
165
errno = e;
166
return NULL;
167
}
168
new_plugin->argv[0] = copy_name;
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
169
114
new_plugin->argv[1] = NULL;
170
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
174
if(new_plugin->environ == NULL){
175
int e = errno;
176
free(copy_name);
177
free(new_plugin->argv);
178
free(new_plugin);
179
errno = e;
180
return NULL;
181
}
182
new_plugin->environ[0] = NULL;
183
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
184
118
/* Append the new plugin to the list */
185
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
186
120
return new_plugin;
187
121
}
188
122
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
static bool add_to_char_array(const char *new, char ***array,
192
int *len){
193
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
210
/* Malloc check */
211
if(new_array == NULL){
212
return false;
213
}
214
*array = new_array;
215
/* Make a copy of the new string */
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
220
if(copy == NULL){
221
return false;
222
}
223
/* Insert the copy */
224
(*array)[*len] = copy;
225
(*len)++;
226
/* Add a new terminating NULL pointer to the last element */
227
(*array)[*len] = NULL;
228
return true;
229
}
230
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
static bool add_argument(plugin *p, const char *arg){
234
if(p == NULL){
235
return false;
236
}
237
return add_to_char_array(arg, &(p->argv), &(p->argc));
238
}
239
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
static bool add_environment(plugin *p, const char *def, bool replace){
243
if(p == NULL){
244
return false;
245
}
246
/* namelen = length of name of environment variable */
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
251
/* It already exists */
252
if(replace){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
258
return false;
259
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
262
}
263
return true;
264
}
265
}
266
return add_to_char_array(def, &(p->environ), &(p->envc));
267
}
268
269
#ifndef O_CLOEXEC
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
132
}
133
270
134
/*
271
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
136
* Descriptor Flags".
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
274
138
*/
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
278
142
/* If reading the flags failed, return error indication now. */
279
143
if(ret < 0){
280
144
return ret;
281
145
}
282
146
/* Store modified flag word in the descriptor. */
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
285
148
}
286
#endif /* not O_CLOEXEC */
287
288
289
/* Mark processes as completed when they exit, and save their exit
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
290
153
status. */
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
293
while(true){
294
plugin *proc = plugin_list;
295
int status;
296
pid_t pid = waitpid(-1, &status, WNOHANG);
297
if(pid == 0){
298
/* Only still running child processes */
299
break;
300
}
301
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
305
}
306
error(0, errno, "waitpid");
307
}
308
309
/* A child exited, find it in process_list */
310
while(proc != NULL and proc->pid != pid){
311
proc = proc->next;
312
}
313
if(proc == NULL){
314
/* Process not found in process list */
315
continue;
316
}
317
proc->status = status;
318
proc->completed = 1;
319
}
320
errno = old_errno;
321
}
322
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
326
ssize_t ret;
327
for(size_t written = 0; written < length; written += (size_t)ret){
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
329
length - written));
330
if(ret < 0){
331
return false;
332
}
333
}
334
return true;
335
}
336
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
static void free_plugin(plugin *plugin_node){
340
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
342
free(*arg);
343
}
344
free(plugin_node->name);
345
free(plugin_node->argv);
346
for(char **env = plugin_node->environ; *env != NULL; env++){
347
free(*env);
348
}
349
free(plugin_node->environ);
350
free(plugin_node->buffer);
351
352
/* Removes the plugin from the singly-linked list */
353
if(plugin_node == plugin_list){
354
/* First one - simple */
355
plugin_list = plugin_list->next;
356
} else {
357
/* Second one or later */
358
for(plugin *p = plugin_list; p != NULL; p = p->next){
359
if(p->next == plugin_node){
360
p->next = plugin_node->next;
361
break;
362
}
363
}
364
}
365
366
free(plugin_node);
367
}
368
369
static void free_plugin_list(void){
370
while(plugin_list != NULL){
371
free_plugin(plugin_list);
372
}
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
373
171
}
374
172
375
173
int main(int argc, char *argv[]){
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
char *argfile = NULL;
379
FILE *conffp;
380
struct dirent **direntries = NULL;
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
175
size_t d_name_len;
176
DIR *dir = NULL;
177
struct dirent *dirst;
381
178
struct stat st;
382
179
fd_set rfds_all;
383
180
int ret, maxfd = 0;
384
ssize_t sret;
385
181
uid_t uid = 65534;
386
182
gid_t gid = 65534;
387
183
bool debug = false;
389
185
struct sigaction old_sigchld_action;
390
186
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
391
187
.sa_flags = SA_NOCLDSTOP };
392
char **custom_argv = NULL;
393
int custom_argc = 0;
394
int dir_fd = -1;
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
395
190
396
191
/* Establish a signal handler */
397
192
sigemptyset(&sigchld_action.sa_mask);
398
193
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
if(ret == -1){
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
402
goto fallback;
194
if(ret < 0){
195
perror("sigaddset");
196
exit(EXIT_FAILURE);
403
197
}
404
198
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
if(ret == -1){
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
408
goto fallback;
199
if(ret < 0){
200
perror("sigaction");
201
exit(EXIT_FAILURE);
409
202
}
410
203
411
204
/* The options we understand. */
413
206
{ .name = "global-options", .key = 'g',
414
207
.arg = "OPTION[,OPTION[,...]]",
415
208
.doc = "Options passed to all plugins" },
416
{ .name = "global-env", .key = 'G',
417
.arg = "VAR=value",
418
.doc = "Environment variable passed to all plugins" },
419
209
{ .name = "options-for", .key = 'o',
420
210
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
421
211
.doc = "Options passed only to specified plugin" },
422
{ .name = "env-for", .key = 'E',
423
.arg = "PLUGIN:ENV=value",
424
.doc = "Environment variable passed to specified plugin" },
425
212
{ .name = "disable", .key = 'd',
426
213
.arg = "PLUGIN",
427
214
.doc = "Disable a specific plugin", .group = 1 },
428
{ .name = "enable", .key = 'e',
429
.arg = "PLUGIN",
430
.doc = "Enable a specific plugin", .group = 1 },
431
215
{ .name = "plugin-dir", .key = 128,
432
216
.arg = "DIRECTORY",
433
217
.doc = "Specify a different plugin directory", .group = 2 },
434
{ .name = "config-file", .key = 129,
435
.arg = "FILE",
436
.doc = "Specify a different configuration file", .group = 2 },
437
{ .name = "userid", .key = 130,
438
.arg = "ID", .flags = 0,
439
.doc = "User ID the plugins will run as", .group = 3 },
440
{ .name = "groupid", .key = 131,
441
.arg = "ID", .flags = 0,
442
.doc = "Group ID the plugins will run as", .group = 3 },
443
{ .name = "debug", .key = 132,
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
458
226
{ .name = NULL }
459
227
};
460
228
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
467
case 'g': /* --global-options */
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
473
}
474
}
475
errno = 0;
476
}
477
break;
478
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
482
break;
483
case 'o': /* --options-for */
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
505
}
506
break;
507
case 'E': /* --env-for */
508
{
509
char *envdef = strchr(arg, ':');
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
516
envdef++;
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
525
}
526
break;
527
case 'd': /* --disable */
528
{
529
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
533
}
534
}
535
break;
536
case 'e': /* --enable */
537
{
538
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
542
}
543
}
544
break;
545
case 128: /* --plugin-dir */
546
free(plugindir);
547
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
551
break;
552
case 129: /* --config-file */
553
/* This is already done by parse_opt_config_file() */
554
break;
555
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
565
break;
566
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
576
break;
577
case 132: /* --debug */
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
233
switch (key) {
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
265
uid = (uid_t)strtol(arg, NULL, 10);
266
break;
267
case 130:
268
gid = (gid_t)strtol(arg, NULL, 10);
269
break;
270
case 131:
578
271
debug = true;
579
272
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
/*
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
606
*/
607
case ARGP_KEY_ARG:
608
/* Cryptsetup always passes an argument, which is an empty
609
string if "none" was specified in /etc/crypttab. So if
610
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
619
default:
620
return ARGP_ERR_UNKNOWN;
621
}
622
return errno; /* Set to 0 at start */
623
}
624
625
/* This option parser is the same as parse_opt() above, except it
626
ignores everything but the --config-file option. */
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
632
case 'g': /* --global-options */
633
case 'G': /* --global-env */
634
case 'o': /* --options-for */
635
case 'E': /* --env-for */
636
case 'd': /* --disable */
637
case 'e': /* --enable */
638
case 128: /* --plugin-dir */
639
break;
640
case 129: /* --config-file */
641
free(argfile);
642
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
646
break;
647
case 130: /* --userid */
648
case 131: /* --groupid */
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
case ARGP_KEY_ARG:
655
break;
656
default:
657
return ARGP_ERR_UNKNOWN;
658
}
659
return errno;
660
}
661
662
struct argp argp = { .options = options,
663
.parser = parse_opt_config_file,
664
.args_doc = "",
273
case ARGP_KEY_ARG:
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
278
break;
279
case ARGP_KEY_END:
280
break;
281
default:
282
return ARGP_ERR_UNKNOWN;
283
}
284
return 0;
285
}
286
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
665
291
.doc = "Mandos plugin runner -- Run plugins" };
666
292
667
/* Parse using parse_opt_config_file() in order to get the custom
668
config file location, if any. */
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
683
goto fallback;
684
}
685
686
/* Reset to the normal argument parser */
687
argp.parser = parse_opt;
688
689
/* Open the configfile if available */
690
if(argfile == NULL){
691
conffp = fopen(AFILE, "r");
692
} else {
693
conffp = fopen(argfile, "r");
694
}
695
if(conffp != NULL){
696
char *org_line = NULL;
697
char *p, *arg, *new_arg, *line;
698
size_t size = 0;
699
const char whitespace_delims[] = " \r\t\f\v\n";
700
const char comment_delim[] = "#";
701
702
custom_argc = 1;
703
custom_argv = malloc(sizeof(char*) * 2);
704
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
707
goto fallback;
708
}
709
custom_argv[0] = argv[0];
710
custom_argv[1] = NULL;
711
712
/* for each line in the config file, strip whitespace and ignore
713
commented text */
714
while(true){
715
sret = getline(&org_line, &size, conffp);
716
if(sret == -1){
717
break;
718
}
719
720
line = org_line;
721
arg = strsep(&line, comment_delim);
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
723
if(p[0] == '\0'){
724
continue;
725
}
726
new_arg = strdup(p);
727
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
730
free(org_line);
731
goto fallback;
732
}
733
734
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
758
}
759
custom_argv[custom_argc-1] = new_arg;
760
custom_argv[custom_argc] = NULL;
761
}
762
}
763
do {
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
766
if(ret == EOF){
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
769
goto fallback;
770
}
771
free(org_line);
772
} else {
773
/* Check for harmful errors and go to fallback. Other errors might
774
not affect opening plugins */
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
778
goto fallback;
779
}
780
}
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
783
if(custom_argv != NULL){
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
786
NULL, NULL);
787
switch(ret){
788
case 0:
789
break;
790
case ENOMEM:
791
default:
792
errno = ret;
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
795
goto fallback;
796
case EINVAL:
797
exitstatus = EX_CONFIG;
798
goto fallback;
799
}
800
}
801
802
/* Parse actual command line arguments, to let them override the
803
config file */
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
806
NULL, NULL);
807
switch(ret){
808
case 0:
809
break;
810
case ENOMEM:
811
default:
812
errno = ret;
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
815
goto fallback;
816
case EINVAL:
817
exitstatus = EX_USAGE;
818
goto fallback;
819
}
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
294
if (ret == ARGP_ERR_UNKNOWN){
295
fprintf(stderr, "Unkown error while parsing arguments\n");
296
exitstatus = EXIT_FAILURE;
297
goto end;
298
}
299
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
310
perror("malloc");
311
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
331
if (ret == ARGP_ERR_UNKNOWN){
332
fprintf(stderr, "Unkown error while parsing arguments\n");
333
exitstatus = EXIT_FAILURE;
334
goto end;
836
335
}
837
336
}
838
337
839
338
if(debug){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
339
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
340
fprintf(stderr, "Plugin: %s has %d arguments\n",
842
341
p->name ? p->name : "Global", p->argc - 1);
843
342
for(char **a = p->argv; *a != NULL; a++){
844
343
fprintf(stderr, "\tArg: %s\n", *a);
845
344
}
846
fprintf(stderr, "...and %d environment variables\n", p->envc);
847
for(char **a = p->environ; *a != NULL; a++){
848
fprintf(stderr, "\t%s\n", *a);
849
}
850
}
851
}
852
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
888
if(ret == -1){
889
error(0, errno, "setgid");
890
}
345
}
346
}
347
891
348
ret = setuid(uid);
892
if(ret == -1){
893
error(0, errno, "setuid");
894
}
895
896
/* Open plugin directory with close_on_exec flag */
349
if (ret == -1){
350
perror("setuid");
351
}
352
353
setgid(gid);
354
if (ret == -1){
355
perror("setgid");
356
}
357
358
dir = opendir(plugindir);
359
if(dir == NULL){
360
perror("Could not open plugin dir");
361
exitstatus = EXIT_FAILURE;
362
goto end;
363
}
364
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
897
366
{
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
905
if(dir_fd == -1){
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
908
goto fallback;
909
}
910
911
#ifndef O_CLOEXEC
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
914
if(ret < 0){
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
917
goto fallback;
918
}
919
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
367
int dir_fd = dirfd(dir);
368
if(dir_fd >= 0){
369
ret = set_cloexec_flag(dir_fd);
370
if(ret < 0){
371
perror("set_cloexec_flag");
372
exitstatus = EXIT_FAILURE;
373
goto end;
942
374
}
943
375
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
954
376
}
955
377
956
378
FD_ZERO(&rfds_all);
957
379
958
/* Read and execute any executable in the plugin directory*/
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
965
continue;
966
}
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
968
if(ret == -1){
969
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
972
continue;
973
}
974
975
/* Ignore non-executable files */
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
380
while(true){
381
dirst = readdir(dir);
382
383
// All directory entries have been processed
384
if(dirst == NULL){
385
if (errno == EBADF){
386
perror("readdir");
387
exitstatus = EXIT_FAILURE;
388
goto end;
389
}
390
break;
391
}
392
393
d_name_len = strlen(dirst->d_name);
394
395
// Ignore dotfiles, backup files and other junk
396
{
397
bool bad_name = false;
398
399
const char const *bad_prefixes[] = { ".", "#", NULL };
400
401
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
402
".dpkg-old",
403
".dpkg-divert", NULL };
404
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
405
size_t pre_len = strlen(*pre);
406
if((d_name_len >= pre_len)
407
and strncmp((dirst->d_name), *pre, pre_len) == 0){
408
if(debug){
409
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
410
" with bad prefix %s\n", dirst->d_name, *pre);
411
}
412
bad_name = true;
413
break;
414
}
415
}
416
417
if(bad_name){
418
continue;
419
}
420
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
422
size_t suf_len = strlen(*suf);
423
if((d_name_len >= suf_len)
424
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
425
== 0)){
426
if(debug){
427
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
428
" with bad suffix %s\n", dirst->d_name, *suf);
429
}
430
bad_name = true;
431
break;
432
}
433
}
434
435
if(bad_name){
436
continue;
437
}
438
}
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
449
450
ret = stat(filename, &st);
451
if (ret == -1){
452
perror("stat");
453
exitstatus = EXIT_FAILURE;
454
goto end;
455
}
456
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
979
458
if(debug){
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
460
" with bad type or mode\n", filename);
984
461
}
985
close(plugin_fd);
986
free(direntries[i]);
987
continue;
988
}
989
990
plugin *p = getplugin(direntries[i]->d_name);
991
if(p == NULL){
992
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
995
continue;
996
}
997
if(p->disabled){
462
free(filename);
463
continue;
464
}
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
998
466
if(debug){
999
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1000
direntries[i]->d_name);
468
dirst->d_name);
1001
469
}
1002
close(plugin_fd);
1003
free(direntries[i]);
470
free(filename);
1004
471
continue;
1005
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
1006
474
{
1007
475
/* Add global arguments to argument list for this plugin */
1008
plugin *g = getplugin(NULL);
1009
if(g != NULL){
1010
for(char **a = g->argv + 1; *a != NULL; a++){
1011
if(not add_argument(p, *a)){
1012
error(0, errno, "add_argument");
1013
}
1014
}
1015
/* Add global environment variables */
1016
for(char **e = g->environ; *e != NULL; e++){
1017
if(not add_environment(p, *e, false)){
1018
error(0, errno, "add_environment");
1019
}
1020
}
1021
}
1022
}
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
1025
if(p->environ[0] != NULL){
1026
for(char **e = environ; *e != NULL; e++){
1027
if(not add_environment(p, *e, false)){
1028
error(0, errno, "add_environment");
1029
}
1030
}
1031
}
1032
1033
int pipefd[2];
1034
#ifndef O_CLOEXEC
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
1039
if(ret == -1){
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
1055
/* Ask OS to automatic close the pipe on exec */
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
482
ret = pipe(pipefd);
483
if (ret == -1){
484
perror("pipe");
485
exitstatus = EXIT_FAILURE;
486
goto end;
487
}
1056
488
ret = set_cloexec_flag(pipefd[0]);
1057
489
if(ret < 0){
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
1063
goto fallback;
490
perror("set_cloexec_flag");
491
exitstatus = EXIT_FAILURE;
492
goto end;
1064
493
}
1065
494
ret = set_cloexec_flag(pipefd[1]);
1066
495
if(ret < 0){
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
1072
goto fallback;
496
perror("set_cloexec_flag");
497
exitstatus = EXIT_FAILURE;
498
goto end;
1073
499
}
1074
#endif /* not O_CLOEXEC */
1075
500
/* Block SIGCHLD until process is safely in process list */
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
1078
NULL));
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1079
502
if(ret < 0){
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
1083
goto fallback;
1084
}
1085
/* Starting a new process to be watched */
1086
pid_t pid;
1087
do {
1088
pid = fork();
1089
} while(pid == -1 and errno == EINTR);
1090
if(pid == -1){
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
1098
goto fallback;
1099
}
503
perror("sigprocmask");
504
exitstatus = EXIT_FAILURE;
505
goto end;
506
}
507
// Starting a new process to be watched
508
pid_t pid = fork();
1100
509
if(pid == 0){
1101
510
/* this is the child process */
1102
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1103
512
if(ret < 0){
1104
error(0, errno, "sigaction");
1105
_exit(EX_OSERR);
513
perror("sigaction");
514
_exit(EXIT_FAILURE);
1106
515
}
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
516
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
517
if(ret < 0){
1109
error(0, errno, "sigprocmask");
1110
_exit(EX_OSERR);
518
perror("sigprocmask");
519
_exit(EXIT_FAILURE);
1111
520
}
1112
521
1113
522
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1114
523
if(ret == -1){
1115
error(0, errno, "dup2");
1116
_exit(EX_OSERR);
524
perror("dup2");
525
_exit(EXIT_FAILURE);
1117
526
}
1118
527
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
528
if(dirfd(dir) < 0){
529
/* If dir has no file descriptor, we could not set FD_CLOEXEC
530
above and must now close it manually here. */
531
closedir(dir);
532
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
1125
536
}
1126
537
/* no return */
1127
538
}
1128
/* Parent process */
1129
close(pipefd[1]); /* Close unused write end of pipe */
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1132
if(new_plugin == NULL){
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1136
NULL)));
539
/* parent process */
540
free(filename);
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1137
546
if(ret < 0){
1138
error(0, errno, "sigprocmask");
547
perror("sigprocmask");
1139
548
}
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
1142
goto fallback;
549
exitstatus = EXIT_FAILURE;
550
goto end;
1143
551
}
1144
free(direntries[i]);
1145
552
1146
new_plugin->pid = pid;
1147
new_plugin->fd = pipefd[0];
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
1154
558
/* Unblock SIGCHLD so signal handler can be run if this process
1155
559
has already completed */
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
1158
NULL));
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1159
561
if(ret < 0){
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
1162
goto fallback;
1163
}
1164
1165
FD_SET(new_plugin->fd, &rfds_all);
1166
1167
if(maxfd < new_plugin->fd){
1168
maxfd = new_plugin->fd;
1169
}
1170
}
1171
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1176
free_plugin(getplugin(NULL));
1177
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
1179
if(p->pid != 0){
1180
break;
1181
}
1182
if(p->next == NULL){
1183
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1184
" directory?\n");
1185
free_plugin_list();
1186
}
1187
}
1188
1189
/* Main loop while running plugins exist */
1190
while(plugin_list){
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
580
}
581
582
closedir(dir);
583
dir = NULL;
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
589
}
590
while(process_list){
1191
591
fd_set rfds = rfds_all;
1192
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
1196
goto fallback;
593
if (select_ret == -1){
594
perror("select");
595
exitstatus = EXIT_FAILURE;
596
goto end;
1197
597
}
1198
598
/* OK, now either a process completed, or something can be read
1199
599
from one of them */
1200
for(plugin *proc = plugin_list; proc != NULL;){
600
for(process *proc = process_list; proc ; proc = proc->next){
1201
601
/* Is this process completely done? */
1202
if(proc->completed and proc->eof){
602
if(proc->eof and proc->completed){
1203
603
/* Only accept the plugin output if it exited cleanly */
1204
604
if(not WIFEXITED(proc->status)
1205
605
or WEXITSTATUS(proc->status) != 0){
1206
606
/* Bad exit by plugin */
1207
1208
607
if(debug){
1209
608
if(WIFEXITED(proc->status)){
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1211
" status %d\n", proc->name,
1212
(intmax_t) (proc->pid),
609
fprintf(stderr, "Plugin %u exited with status %d\n",
610
(unsigned int) (proc->pid),
1213
611
WEXITSTATUS(proc->status));
1214
} else if(WIFSIGNALED(proc->status)){
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1216
" signal %d: %s\n", proc->name,
1217
(intmax_t) (proc->pid),
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
612
} else if(WIFSIGNALED(proc->status)) {
613
fprintf(stderr, "Plugin %u killed by signal %d\n",
614
(unsigned int) (proc->pid),
615
WTERMSIG(proc->status));
616
} else if(WCOREDUMP(proc->status)){
617
fprintf(stderr, "Plugin %d dumped core\n",
618
(unsigned int) (proc->pid));
1220
619
}
1221
620
}
1222
1223
621
/* Remove the plugin */
1224
622
FD_CLR(proc->fd, &rfds_all);
1225
1226
623
/* Block signal while modifying process_list */
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1228
(SIG_BLOCK,
1229
&sigchld_action.sa_mask,
1230
NULL));
624
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1231
625
if(ret < 0){
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
1234
goto fallback;
1235
}
1236
1237
plugin *next_plugin = proc->next;
1238
free_plugin(proc);
1239
proc = next_plugin;
1240
626
perror("sigprocmask");
627
exitstatus = EXIT_FAILURE;
628
goto end;
629
}
630
/* Delete this process entry from the list */
631
if(process_list == proc){
632
/* First one - simple */
633
process_list = proc->next;
634
} else {
635
/* Second one or later */
636
for(process *p = process_list; p != NULL; p = p->next){
637
if(p->next == proc){
638
p->next = proc->next;
639
break;
640
}
641
}
642
}
1241
643
/* We are done modifying process list, so unblock signal */
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
644
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
645
NULL);
1245
646
if(ret < 0){
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
1248
goto fallback;
1249
}
1250
1251
if(plugin_list == NULL){
1252
break;
1253
}
1254
1255
continue;
647
perror("sigprocmask");
648
}
649
free(proc->buffer);
650
free(proc);
651
/* We deleted this process from the list, so we can't go
652
proc->next. Therefore, start over from the beginning of
653
the process list */
654
break;
1256
655
}
1257
1258
656
/* This process exited nicely, so print its buffer */
1259
1260
bool bret = print_out_password(proc->buffer,
1261
proc->buffer_length);
1262
if(not bret){
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;
657
for(size_t written = 0; written < proc->buffer_length;
658
written += (size_t)ret){
659
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
660
proc->buffer + written,
661
proc->buffer_length
662
- written));
663
if(ret < 0){
664
perror("write");
665
exitstatus = EXIT_FAILURE;
666
goto end;
667
}
1265
668
}
1266
goto fallback;
669
goto end;
1267
670
}
1268
1269
671
/* This process has not completed. Does it have any output? */
1270
672
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1271
673
/* This process had nothing to say at this time */
1272
proc = proc->next;
1273
674
continue;
1274
675
}
1275
676
/* Before reading, make the process' data buffer large enough */
1276
677
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1280
error(0, errno, "malloc");
1281
exitstatus = EX_OSERR;
1282
goto fallback;
678
proc->buffer = realloc(proc->buffer, proc->buffer_size
679
+ (size_t) BUFFER_SIZE);
680
if (proc->buffer == NULL){
681
perror("malloc");
682
exitstatus = EXIT_FAILURE;
683
goto end;
1283
684
}
1284
proc->buffer = new_buffer;
1285
685
proc->buffer_size += BUFFER_SIZE;
1286
686
}
1287
687
/* Read from the process */
1288
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
proc->buffer
1290
+ proc->buffer_length,
1291
BUFFER_SIZE));
1292
if(sret < 0){
688
ret = read(proc->fd, proc->buffer + proc->buffer_length,
689
BUFFER_SIZE);
690
if(ret < 0){
1293
691
/* Read error from this process; ignore the error */
1294
proc = proc->next;
1295
692
continue;
1296
693
}
1297
if(sret == 0){
694
if(ret == 0){
1298
695
/* got EOF */
1299
696
proc->eof = true;
1300
697
} else {
1301
proc->buffer_length += (size_t) sret;
698
proc->buffer_length += (size_t) ret;
1302
699
}
1303
700
}
1304
701
}
1305
1306
1307
fallback:
1308
1309
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1310
and exitstatus != EX_OK)){
1311
/* Fallback if all plugins failed, none are found or an error
1312
occured */
1313
bool bret;
1314
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1315
char *passwordbuffer = getpass("Password: ");
1316
size_t len = strlen(passwordbuffer);
1317
/* Strip trailing newline */
1318
if(len > 0 and passwordbuffer[len-1] == '\n'){
1319
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1320
len--;
1321
}
1322
bret = print_out_password(passwordbuffer, len);
1323
if(not bret){
1324
error(0, errno, "print_out_password");
1325
exitstatus = EX_IOERR;
1326
}
702
if(process_list == NULL){
703
fprintf(stderr, "All plugin processes failed, exiting\n");
704
exitstatus = EXIT_FAILURE;
1327
705
}
1328
706
707
end:
1329
708
/* Restore old signal handler */
1330
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1331
if(ret == -1){
1332
error(0, errno, "sigaction");
1333
exitstatus = EX_OSERR;
1334
}
1335
1336
if(custom_argv != NULL){
1337
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1338
free(*arg);
1339
}
1340
free(custom_argv);
1341
}
1342
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1347
}
1348
1349
/* Kill the processes */
1350
for(plugin *p = plugin_list; p != NULL; p = p->next){
1351
if(p->pid != 0){
1352
close(p->fd);
1353
ret = kill(p->pid, SIGTERM);
1354
if(ret == -1 and errno != ESRCH){
1355
/* Set-uid proccesses might not get closed */
1356
error(0, errno, "kill");
1357
}
1358
}
709
sigaction(SIGCHLD, &old_sigchld_action, NULL);
710
711
free(plus_argv);
712
713
/* Free the plugin list */
714
for(plugin *next; plugin_list != NULL; plugin_list = next){
715
next = plugin_list->next;
716
free(plugin_list->argv);
717
free(plugin_list);
718
}
719
720
if(dir != NULL){
721
closedir(dir);
722
}
723
724
/* Free the process list and kill the processes */
725
for(process *next; process_list != NULL; process_list = next){
726
next = process_list->next;
727
close(process_list->fd);
728
ret = kill(process_list->pid, SIGTERM);
729
if(ret == -1 and errno != ESRCH){
730
/* set-uid proccesses migth not get closed */
731
perror("kill");
732
}
733
free(process_list->buffer);
734
free(process_list);
1359
735
}
1360
736
1361
737
/* Wait for any remaining child processes to terminate */
1362
do {
738
do{
1363
739
ret = wait(NULL);
1364
740
} while(ret >= 0);
1365
741
if(errno != ECHILD){
1366
error(0, errno, "wait");
742
perror("wait");
1367
743
}
1368
744
1369
free_plugin_list();
1370
1371
free(plugindir);
1372
free(pluginhelperdir);
1373
free(argfile);
1374
1375
745
return exitstatus;
1376
746
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0