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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 © 2008-2021 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(), getline(),
25
asprintf() */
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> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
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
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>";
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;
98
86
99
87
typedef struct plugin{
100
88
char *name; /* can be NULL or any plugin name */
103
91
char **environ;
104
92
int envc;
105
93
bool disabled;
106
107
/* Variables used for running processes*/
108
pid_t pid;
109
int fd;
110
char *buffer;
111
size_t buffer_size;
112
size_t buffer_length;
113
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
116
94
struct plugin *next;
117
95
} plugin;
118
96
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))){
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))){
129
101
return p;
130
102
}
131
103
}
132
104
/* 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){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
138
107
return NULL;
139
108
}
140
109
char *copy_name = NULL;
141
110
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
145
112
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
113
return NULL;
150
114
}
151
115
}
152
116
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
157
122
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;
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
163
125
free(copy_name);
164
126
free(new_plugin);
165
errno = e;
166
127
return NULL;
167
128
}
168
129
new_plugin->argv[0] = copy_name;
169
130
new_plugin->argv[1] = NULL;
170
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
174
133
if(new_plugin->environ == NULL){
175
int e = errno;
176
134
free(copy_name);
177
135
free(new_plugin->argv);
178
136
free(new_plugin);
179
errno = e;
180
137
return NULL;
181
138
}
182
139
new_plugin->environ[0] = NULL;
183
184
140
/* Append the new plugin to the list */
185
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
186
142
return new_plugin;
187
143
}
188
144
189
145
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
146
static bool add_to_char_array(const char *new, char ***array,
192
147
int *len){
193
148
/* 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);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
210
151
/* Malloc check */
211
if(new_array == NULL){
152
if(*array == NULL){
212
153
return false;
213
154
}
214
*array = new_array;
215
155
/* Make a copy of the new string */
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
220
157
if(copy == NULL){
221
158
return false;
222
159
}
229
166
}
230
167
231
168
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
169
static bool add_argument(plugin *p, const char *arg){
234
170
if(p == NULL){
235
171
return false;
238
174
}
239
175
240
176
/* 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){
177
static bool add_environment(plugin *p, const char *def){
243
178
if(p == NULL){
244
179
return false;
245
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
267
182
}
268
183
269
#ifndef O_CLOEXEC
184
270
185
/*
271
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
187
* Descriptor Flags".
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
274
189
*/
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));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
278
193
/* If reading the flags failed, return error indication now. */
279
194
if(ret < 0){
280
195
return ret;
281
196
}
282
197
/* Store modified flag word in the descriptor. */
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
285
199
}
286
#endif /* not O_CLOEXEC */
287
200
201
process *process_list = NULL;
288
202
289
203
/* Mark processes as completed when they exit, and save their exit
290
204
status. */
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
293
206
while(true){
294
plugin *proc = plugin_list;
207
process *proc = process_list;
295
208
int status;
296
209
pid_t pid = waitpid(-1, &status, WNOHANG);
297
210
if(pid == 0){
299
212
break;
300
213
}
301
214
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
215
if (errno != ECHILD){
216
perror("waitpid");
305
217
}
306
error(0, errno, "waitpid");
218
/* No child processes */
219
break;
307
220
}
308
221
309
222
/* A child exited, find it in process_list */
310
223
while(proc != NULL and proc->pid != pid){
311
224
proc = proc->next;
315
228
continue;
316
229
}
317
230
proc->status = status;
318
proc->completed = 1;
231
proc->completed = true;
319
232
}
320
errno = old_errno;
321
233
}
322
234
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){
235
bool print_out_password(const char *buffer, size_t length){
326
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
327
240
for(size_t written = 0; written < length; written += (size_t)ret){
328
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
329
242
length - written));
334
247
return true;
335
248
}
336
249
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);
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);
372
262
}
373
263
}
374
264
375
265
int main(int argc, char *argv[]){
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
char *argfile = NULL;
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
379
268
FILE *conffp;
380
struct dirent **direntries = NULL;
269
size_t d_name_len;
270
DIR *dir = NULL;
271
struct dirent *dirst;
381
272
struct stat st;
382
273
fd_set rfds_all;
383
274
int ret, maxfd = 0;
384
ssize_t sret;
385
275
uid_t uid = 65534;
386
276
gid_t gid = 65534;
387
277
bool debug = false;
391
281
.sa_flags = SA_NOCLDSTOP };
392
282
char **custom_argv = NULL;
393
283
int custom_argc = 0;
394
int dir_fd = -1;
395
284
396
285
/* Establish a signal handler */
397
286
sigemptyset(&sigchld_action.sa_mask);
398
287
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
288
if(ret == -1){
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
289
perror("sigaddset");
290
exitstatus = EXIT_FAILURE;
402
291
goto fallback;
403
292
}
404
293
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
294
if(ret == -1){
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
295
perror("sigaction");
296
exitstatus = EXIT_FAILURE;
408
297
goto fallback;
409
298
}
410
299
413
302
{ .name = "global-options", .key = 'g',
414
303
.arg = "OPTION[,OPTION[,...]]",
415
304
.doc = "Options passed to all plugins" },
416
{ .name = "global-env", .key = 'G',
305
{ .name = "global-envs", .key = 'e',
417
306
.arg = "VAR=value",
418
307
.doc = "Environment variable passed to all plugins" },
419
308
{ .name = "options-for", .key = 'o',
420
309
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
421
310
.doc = "Options passed only to specified plugin" },
422
{ .name = "env-for", .key = 'E',
311
{ .name = "envs-for", .key = 'f',
423
312
.arg = "PLUGIN:ENV=value",
424
313
.doc = "Environment variable passed to specified plugin" },
425
314
{ .name = "disable", .key = 'd',
426
315
.arg = "PLUGIN",
427
316
.doc = "Disable a specific plugin", .group = 1 },
428
{ .name = "enable", .key = 'e',
429
.arg = "PLUGIN",
430
.doc = "Enable a specific plugin", .group = 1 },
431
317
{ .name = "plugin-dir", .key = 128,
432
318
.arg = "DIRECTORY",
433
319
.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 },
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 },
458
328
{ .name = NULL }
459
329
};
460
330
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 */
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
}
508
392
{
509
393
char *envdef = strchr(arg, ':');
510
394
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
395
break;
396
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
516
401
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 */
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:
578
426
debug = true;
579
427
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 = "",
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]",
665
443
.doc = "Mandos plugin runner -- Run plugins" };
666
444
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
}
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");
695
453
if(conffp != NULL){
696
454
char *org_line = NULL;
697
455
char *p, *arg, *new_arg, *line;
698
456
size_t size = 0;
457
ssize_t sret;
699
458
const char whitespace_delims[] = " \r\t\f\v\n";
700
459
const char comment_delim[] = "#";
701
460
702
461
custom_argc = 1;
703
462
custom_argv = malloc(sizeof(char*) * 2);
704
463
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
464
perror("malloc");
465
exitstatus = EXIT_FAILURE;
707
466
goto fallback;
708
467
}
709
468
custom_argv[0] = argv[0];
710
469
custom_argv[1] = NULL;
711
470
712
/* for each line in the config file, strip whitespace and ignore
713
commented text */
714
471
while(true){
715
472
sret = getline(&org_line, &size, conffp);
716
473
if(sret == -1){
717
474
break;
718
475
}
719
476
720
477
line = org_line;
721
478
arg = strsep(&line, comment_delim);
722
479
while((p = strsep(&arg, whitespace_delims)) != NULL){
724
481
continue;
725
482
}
726
483
new_arg = strdup(p);
727
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
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;
730
491
free(org_line);
731
492
goto fallback;
732
493
}
733
734
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
759
}
760
494
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
495
custom_argv[custom_argc] = NULL;
762
496
}
763
497
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
772
498
free(org_line);
773
} else {
499
} else{
774
500
/* Check for harmful errors and go to fallback. Other errors might
775
501
not affect opening plugins */
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
perror("fopen");
504
exitstatus = EXIT_FAILURE;
779
505
goto fallback;
780
506
}
781
507
}
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
508
784
509
if(custom_argv != NULL){
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
799
goto fallback;
800
}
801
}
802
803
/* Parse actual command line arguments, to let them override the
804
config file */
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
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;
837
515
}
838
516
}
839
517
840
518
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
519
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
520
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
521
p->name ? p->name : "Global", p->argc - 1);
844
522
for(char **a = p->argv; *a != NULL; a++){
845
523
fprintf(stderr, "\tArg: %s\n", *a);
846
524
}
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
848
526
for(char **a = p->environ; *a != NULL; a++){
849
527
fprintf(stderr, "\t%s\n", *a);
850
528
}
851
529
}
852
530
}
853
531
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
892
532
ret = setuid(uid);
893
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* 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 */
898
550
{
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
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;
943
558
}
944
559
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
955
560
}
956
561
957
562
FD_ZERO(&rfds_all);
958
563
959
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
966
continue;
967
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
973
continue;
974
}
975
976
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
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)){
980
639
if(debug){
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
" with bad type or mode\n", filename);
985
642
}
986
close(plugin_fd);
987
free(direntries[i]);
643
free(filename);
988
644
continue;
989
645
}
990
991
plugin *p = getplugin(direntries[i]->d_name);
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
992
647
if(p == NULL){
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
648
perror("getplugin");
649
free(filename);
996
650
continue;
997
651
}
998
652
if(p->disabled){
999
653
if(debug){
1000
654
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
655
dirst->d_name);
1002
656
}
1003
close(plugin_fd);
1004
free(direntries[i]);
657
free(filename);
1005
658
continue;
1006
659
}
1007
660
{
1008
661
/* Add global arguments to argument list for this plugin */
1009
plugin *g = getplugin(NULL);
662
plugin *g = getplugin(NULL, &plugin_list);
1010
663
if(g != NULL){
1011
664
for(char **a = g->argv + 1; *a != NULL; a++){
1012
665
if(not add_argument(p, *a)){
1013
error(0, errno, "add_argument");
666
perror("add_argument");
1014
667
}
1015
668
}
1016
669
/* Add global environment variables */
1017
670
for(char **e = g->environ; *e != NULL; e++){
1018
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
671
if(not add_environment(p, *e)){
672
perror("add_environment");
1020
673
}
1021
674
}
1022
675
}
1023
676
}
1024
/* If this plugin has any environment variables, we need to
1025
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. */
1026
680
if(p->environ[0] != NULL){
1027
681
for(char **e = environ; *e != NULL; e++){
1028
if(not add_environment(p, *e, false)){
1029
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");
1030
689
}
1031
690
}
1032
691
}
1033
692
1034
693
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1040
if(ret == -1){
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
1056
/* 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
}
1057
700
ret = set_cloexec_flag(pipefd[0]);
1058
701
if(ret < 0){
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
702
perror("set_cloexec_flag");
703
exitstatus = EXIT_FAILURE;
1064
704
goto fallback;
1065
705
}
1066
706
ret = set_cloexec_flag(pipefd[1]);
1067
707
if(ret < 0){
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
1073
710
goto fallback;
1074
711
}
1075
#endif /* not O_CLOEXEC */
1076
712
/* Block SIGCHLD until process is safely in process list */
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1080
714
if(ret < 0){
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
715
perror("sigprocmask");
716
exitstatus = EXIT_FAILURE;
1084
717
goto fallback;
1085
718
}
1086
/* Starting a new process to be watched */
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
719
// Starting a new process to be watched
720
pid_t pid = fork();
1091
721
if(pid == -1){
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
722
perror("fork");
723
exitstatus = EXIT_FAILURE;
1099
724
goto fallback;
1100
725
}
1101
726
if(pid == 0){
1102
727
/* this is the child process */
1103
728
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1104
729
if(ret < 0){
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
730
perror("sigaction");
731
_exit(EXIT_FAILURE);
1107
732
}
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
734
if(ret < 0){
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
735
perror("sigprocmask");
736
_exit(EXIT_FAILURE);
1112
737
}
1113
738
1114
739
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1115
740
if(ret == -1){
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
741
perror("dup2");
742
_exit(EXIT_FAILURE);
1118
743
}
1119
744
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_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
}
1126
760
}
1127
761
/* no return */
1128
762
}
1129
/* Parent process */
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
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);
1138
770
if(ret < 0){
1139
error(0, errno, "sigprocmask");
771
perror("sigprocmask");
1140
772
}
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
773
exitstatus = EXIT_FAILURE;
1143
774
goto fallback;
1144
775
}
1145
free(direntries[i]);
1146
776
1147
new_plugin->pid = pid;
1148
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
1155
782
/* Unblock SIGCHLD so signal handler can be run if this process
1156
783
has already completed */
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1160
785
if(ret < 0){
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
1163
788
goto fallback;
1164
789
}
1165
790
1166
FD_SET(new_plugin->fd, &rfds_all);
1167
1168
if(maxfd < new_plugin->fd){
1169
maxfd = new_plugin->fd;
1170
}
1171
}
1172
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
1178
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
if(p->pid != 0){
1181
break;
1182
}
1183
if(p->next == NULL){
1184
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1185
" directory?\n");
1186
free_plugin_list();
1187
}
1188
}
1189
1190
/* Main loop while running plugins exist */
1191
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){
1192
811
fd_set rfds = rfds_all;
1193
812
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
813
if (select_ret == -1){
814
perror("select");
815
exitstatus = EXIT_FAILURE;
1197
816
goto fallback;
1198
817
}
1199
818
/* OK, now either a process completed, or something can be read
1200
819
from one of them */
1201
for(plugin *proc = plugin_list; proc != NULL;){
820
for(process *proc = process_list; proc ; proc = proc->next){
1202
821
/* Is this process completely done? */
1203
if(proc->completed and proc->eof){
822
if(proc->eof and proc->completed){
1204
823
/* Only accept the plugin output if it exited cleanly */
1205
824
if(not WIFEXITED(proc->status)
1206
825
or WEXITSTATUS(proc->status) != 0){
1207
826
/* Bad exit by plugin */
1208
1209
827
if(debug){
1210
828
if(WIFEXITED(proc->status)){
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
1214
831
WEXITSTATUS(proc->status));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
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));
1221
839
}
1222
840
}
1223
1224
841
/* Remove the plugin */
1225
842
FD_CLR(proc->fd, &rfds_all);
1226
1227
843
/* Block signal while modifying process_list */
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1232
845
if(ret < 0){
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
846
perror("sigprocmask");
847
exitstatus = EXIT_FAILURE;
1235
848
goto fallback;
1236
849
}
1237
1238
plugin *next_plugin = proc->next;
1239
free_plugin(proc);
1240
proc = next_plugin;
1241
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
}
1242
863
/* We are done modifying process list, so unblock signal */
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1246
866
if(ret < 0){
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1249
goto fallback;
1250
}
1251
1252
if(plugin_list == NULL){
1253
break;
1254
}
1255
1256
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;
1257
875
}
1258
1259
876
/* This process exited nicely, so print its buffer */
1260
877
1261
878
bool bret = print_out_password(proc->buffer,
1262
879
proc->buffer_length);
1263
880
if(not bret){
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
881
perror("print_out_password");
882
exitstatus = EXIT_FAILURE;
1266
883
}
1267
884
goto fallback;
1268
885
}
1269
1270
886
/* This process has not completed. Does it have any output? */
1271
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1272
888
/* This process had nothing to say at this time */
1273
proc = proc->next;
1274
889
continue;
1275
890
}
1276
891
/* Before reading, make the process' data buffer large enough */
1277
892
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
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;
1283
898
goto fallback;
1284
899
}
1285
proc->buffer = new_buffer;
1286
900
proc->buffer_size += BUFFER_SIZE;
1287
901
}
1288
902
/* Read from the process */
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1293
if(sret < 0){
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1294
906
/* Read error from this process; ignore the error */
1295
proc = proc->next;
1296
907
continue;
1297
908
}
1298
if(sret == 0){
909
if(ret == 0){
1299
910
/* got EOF */
1300
911
proc->eof = true;
1301
912
} else {
1302
proc->buffer_length += (size_t) sret;
913
proc->buffer_length += (size_t) ret;
1303
914
}
1304
915
}
1305
916
}
1306
1307
917
918
1308
919
fallback:
1309
920
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1312
922
/* Fallback if all plugins failed, none are found or an error
1313
923
occured */
1314
924
bool bret;
1315
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1316
926
char *passwordbuffer = getpass("Password: ");
1317
size_t len = strlen(passwordbuffer);
1318
/* Strip trailing newline */
1319
if(len > 0 and passwordbuffer[len-1] == '\n'){
1320
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1321
len--;
1322
}
1323
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1324
928
if(not bret){
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1327
931
}
1328
932
}
1329
933
1330
934
/* Restore old signal handler */
1331
935
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1332
936
if(ret == -1){
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
1335
939
}
1336
940
1337
941
if(custom_argv != NULL){
1338
942
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1339
943
free(*arg);
1340
944
}
1341
945
free(custom_argv);
1342
946
}
1343
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
947
free_plugin_list(plugin_list);
948
949
if(dir != NULL){
950
closedir(dir);
1348
951
}
1349
952
1350
/* Kill the processes */
1351
for(plugin *p = plugin_list; p != NULL; p = p->next){
1352
if(p->pid != 0){
1353
close(p->fd);
1354
ret = kill(p->pid, SIGTERM);
1355
if(ret == -1 and errno != ESRCH){
1356
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1358
}
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");
1359
961
}
962
free(process_list->buffer);
963
free(process_list);
1360
964
}
1361
965
1362
966
/* Wait for any remaining child processes to terminate */
1363
do {
967
do{
1364
968
ret = wait(NULL);
1365
969
} while(ret >= 0);
1366
970
if(errno != ECHILD){
1367
error(0, errno, "wait");
971
perror("wait");
1368
972
}
1369
973
1370
free_plugin_list();
1371
1372
free(plugindir);
1373
free(pluginhelperdir);
1374
free(argfile);
1375
1376
974
return exitstatus;
1377
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0