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- Committer: Teddy Hogeborn
- Date: 2008-08-30 19:05:15 UTC
- Revision ID: teddy@fukt.bsnet.se-20080830190515-l7e6vu81yyw5kcku
* mandos.xml (SYNOPSIS): Use <option> and <replaceable> tags. Unify
short and long options.
short and long options.
- 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:
- .bzrignore
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 © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read(),
51
lstat(), symlink() */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
71
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
84
88
85
89
typedef struct plugin{
86
90
char *name; /* can be NULL or any plugin name */
89
93
char **environ;
90
94
int envc;
91
95
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
102
96
struct plugin *next;
103
97
} plugin;
104
98
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
115
103
return p;
116
104
}
117
105
}
118
106
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
124
109
return NULL;
125
110
}
126
111
char *copy_name = NULL;
127
112
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
113
copy_name = strdup(name);
131
114
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
115
return NULL;
136
116
}
137
117
}
138
118
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
143
124
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
149
127
free(copy_name);
150
128
free(new_plugin);
151
errno = e;
152
129
return NULL;
153
130
}
154
131
new_plugin->argv[0] = copy_name;
155
132
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
133
134
new_plugin->environ = malloc(sizeof(char *));
160
135
if(new_plugin->environ == NULL){
161
int e = errno;
162
136
free(copy_name);
163
137
free(new_plugin->argv);
164
138
free(new_plugin);
165
errno = e;
166
139
return NULL;
167
140
}
168
141
new_plugin->environ[0] = NULL;
169
170
142
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
172
144
return new_plugin;
173
145
}
174
146
175
147
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
148
static bool add_to_char_array(const char *new, char ***array,
178
149
int *len){
179
150
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
196
153
/* Malloc check */
197
if(new_array == NULL){
154
if(*array == NULL){
198
155
return false;
199
156
}
200
*array = new_array;
201
157
/* Make a copy of the new string */
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
158
char *copy = strdup(new);
206
159
if(copy == NULL){
207
160
return false;
208
161
}
215
168
}
216
169
217
170
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
171
static bool add_argument(plugin *p, const char *arg){
220
172
if(p == NULL){
221
173
return false;
224
176
}
225
177
226
178
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
229
180
if(p == NULL){
230
181
return false;
231
182
}
232
/* namelen = length of name of environment variable */
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
237
/* It already exists */
238
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
244
return false;
245
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
248
}
249
return true;
250
}
251
}
252
183
return add_to_char_array(def, &(p->environ), &(p->envc));
253
184
}
254
185
255
#ifndef O_CLOEXEC
186
256
187
/*
257
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
189
* Descriptor Flags".
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
260
191
*/
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
264
195
/* If reading the flags failed, return error indication now. */
265
196
if(ret < 0){
266
197
return ret;
267
198
}
268
199
/* Store modified flag word in the descriptor. */
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
271
201
}
272
#endif /* not O_CLOEXEC */
273
202
203
process *process_list = NULL;
274
204
275
205
/* Mark processes as completed when they exit, and save their exit
276
206
status. */
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
279
208
while(true){
280
plugin *proc = plugin_list;
209
process *proc = process_list;
281
210
int status;
282
211
pid_t pid = waitpid(-1, &status, WNOHANG);
283
212
if(pid == 0){
285
214
break;
286
215
}
287
216
if(pid == -1){
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
217
if (errno != ECHILD){
218
perror("waitpid");
291
219
}
292
error(0, errno, "waitpid");
220
/* No child processes */
221
break;
293
222
}
294
223
295
224
/* A child exited, find it in process_list */
296
225
while(proc != NULL and proc->pid != pid){
297
226
proc = proc->next;
301
230
continue;
302
231
}
303
232
proc->status = status;
304
proc->completed = 1;
233
proc->completed = true;
305
234
}
306
errno = old_errno;
307
235
}
308
236
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
312
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
313
242
for(size_t written = 0; written < length; written += (size_t)ret){
314
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
315
244
length - written));
320
249
return true;
321
250
}
322
251
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
static void free_plugin(plugin *plugin_node){
326
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
328
free(*arg);
329
}
330
free(plugin_node->name);
331
free(plugin_node->argv);
332
for(char **env = plugin_node->environ; *env != NULL; env++){
333
free(*env);
334
}
335
free(plugin_node->environ);
336
free(plugin_node->buffer);
337
338
/* Removes the plugin from the singly-linked list */
339
if(plugin_node == plugin_list){
340
/* First one - simple */
341
plugin_list = plugin_list->next;
342
} else {
343
/* Second one or later */
344
for(plugin *p = plugin_list; p != NULL; p = p->next){
345
if(p->next == plugin_node){
346
p->next = plugin_node->next;
347
break;
348
}
349
}
350
}
351
352
free(plugin_node);
353
}
354
355
static void free_plugin_list(void){
356
while(plugin_list != NULL){
357
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
358
264
}
359
265
}
360
266
361
267
int main(int argc, char *argv[]){
362
268
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
269
char *argfile = NULL;
365
270
FILE *conffp;
366
struct dirent **direntries = NULL;
271
size_t d_name_len;
272
DIR *dir = NULL;
273
struct dirent *dirst;
367
274
struct stat st;
368
275
fd_set rfds_all;
369
276
int ret, maxfd = 0;
370
ssize_t sret;
371
277
uid_t uid = 65534;
372
278
gid_t gid = 65534;
373
279
bool debug = false;
377
283
.sa_flags = SA_NOCLDSTOP };
378
284
char **custom_argv = NULL;
379
285
int custom_argc = 0;
380
int dir_fd = -1;
381
286
382
287
/* Establish a signal handler */
383
288
sigemptyset(&sigchld_action.sa_mask);
384
289
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
290
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
388
293
goto fallback;
389
294
}
390
295
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
296
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
394
299
goto fallback;
395
300
}
396
301
399
304
{ .name = "global-options", .key = 'g',
400
305
.arg = "OPTION[,OPTION[,...]]",
401
306
.doc = "Options passed to all plugins" },
402
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
403
308
.arg = "VAR=value",
404
309
.doc = "Environment variable passed to all plugins" },
405
310
{ .name = "options-for", .key = 'o',
406
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
407
312
.doc = "Options passed only to specified plugin" },
408
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
409
314
.arg = "PLUGIN:ENV=value",
410
315
.doc = "Environment variable passed to specified plugin" },
411
316
{ .name = "disable", .key = 'd',
412
317
.arg = "PLUGIN",
413
318
.doc = "Disable a specific plugin", .group = 1 },
414
{ .name = "enable", .key = 'e',
415
.arg = "PLUGIN",
416
.doc = "Enable a specific plugin", .group = 1 },
417
319
{ .name = "plugin-dir", .key = 128,
418
320
.arg = "DIRECTORY",
419
321
.doc = "Specify a different plugin directory", .group = 2 },
428
330
.doc = "Group ID the plugins will run as", .group = 3 },
429
331
{ .name = "debug", .key = 132,
430
332
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
444
333
{ .name = NULL }
445
334
};
446
335
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
453
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
459
}
460
}
461
errno = 0;
462
}
463
break;
464
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
468
break;
469
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
491
}
492
break;
493
case 'E': /* --env-for */
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
367
}
368
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
494
397
{
495
398
char *envdef = strchr(arg, ':');
496
399
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
502
406
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
511
}
512
break;
513
case 'd': /* --disable */
514
{
515
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
519
}
520
}
521
break;
522
case 'e': /* --enable */
523
{
524
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
528
}
529
}
530
break;
531
case 128: /* --plugin-dir */
532
free(plugindir);
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
409
}
410
}
411
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
419
}
420
break;
421
case 128:
533
422
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
537
break;
538
case 129: /* --config-file */
539
/* This is already done by parse_opt_config_file() */
540
break;
541
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
551
break;
552
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
562
break;
563
case 132: /* --debug */
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
428
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
564
440
debug = true;
565
441
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
default:
606
return ARGP_ERR_UNKNOWN;
607
}
608
return errno; /* Set to 0 at start */
609
}
610
611
/* This option parser is the same as parse_opt() above, except it
612
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
618
case 'g': /* --global-options */
619
case 'G': /* --global-env */
620
case 'o': /* --options-for */
621
case 'E': /* --env-for */
622
case 'd': /* --disable */
623
case 'e': /* --enable */
624
case 128: /* --plugin-dir */
625
break;
626
case 129: /* --config-file */
627
free(argfile);
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
632
break;
633
case 130: /* --userid */
634
case 131: /* --groupid */
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
case ARGP_KEY_ARG:
641
break;
642
default:
643
return ARGP_ERR_UNKNOWN;
644
}
645
return errno;
646
}
647
648
struct argp argp = { .options = options,
649
.parser = parse_opt_config_file,
650
.args_doc = "",
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
break;
447
default:
448
return ARGP_ERR_UNKNOWN;
449
}
450
return 0;
451
}
452
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
651
457
.doc = "Mandos plugin runner -- Run plugins" };
652
458
653
/* Parse using parse_opt_config_file() in order to get the custom
654
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
669
463
goto fallback;
670
464
}
671
672
/* Reset to the normal argument parser */
673
argp.parser = parse_opt;
674
675
/* Open the configfile if available */
676
if(argfile == NULL){
465
466
if (argfile == NULL){
677
467
conffp = fopen(AFILE, "r");
678
468
} else {
679
469
conffp = fopen(argfile, "r");
680
470
}
471
681
472
if(conffp != NULL){
682
473
char *org_line = NULL;
683
474
char *p, *arg, *new_arg, *line;
684
475
size_t size = 0;
476
ssize_t sret;
685
477
const char whitespace_delims[] = " \r\t\f\v\n";
686
478
const char comment_delim[] = "#";
687
479
688
480
custom_argc = 1;
689
481
custom_argv = malloc(sizeof(char*) * 2);
690
482
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
693
485
goto fallback;
694
486
}
695
487
custom_argv[0] = argv[0];
696
488
custom_argv[1] = NULL;
697
489
698
/* for each line in the config file, strip whitespace and ignore
699
commented text */
700
490
while(true){
701
491
sret = getline(&org_line, &size, conffp);
702
492
if(sret == -1){
703
493
break;
704
494
}
705
495
706
496
line = org_line;
707
497
arg = strsep(&line, comment_delim);
708
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
711
501
}
712
502
new_arg = strdup(p);
713
503
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
716
506
free(org_line);
717
507
goto fallback;
718
508
}
719
509
720
510
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
511
custom_argv = realloc(custom_argv, sizeof(char *)
512
* ((unsigned int) custom_argc + 1));
513
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
516
free(org_line);
517
goto fallback;
744
518
}
745
519
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
747
521
}
748
522
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
757
523
free(org_line);
758
} else {
524
} else{
759
525
/* Check for harmful errors and go to fallback. Other errors might
760
526
not affect opening plugins */
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
764
530
goto fallback;
765
531
}
766
532
}
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
533
769
534
if(custom_argv != NULL){
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
784
goto fallback;
785
}
786
}
787
788
/* Parse actual command line arguments, to let them override the
789
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
539
goto fallback;
822
540
}
823
541
}
824
542
825
543
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
546
p->name ? p->name : "Global", p->argc - 1);
829
547
for(char **a = p->argv; *a != NULL; a++){
830
548
fprintf(stderr, "\tArg: %s\n", *a);
831
549
}
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
833
551
for(char **a = p->environ; *a != NULL; a++){
834
552
fprintf(stderr, "\t%s\n", *a);
835
553
}
836
554
}
837
555
}
838
556
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
862
/* Work around Debian bug #981302
863
<https://bugs.debian.org/981302> */
864
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
865
ret = symlink("/proc/self/fd", "/dev/fd");
866
if(ret == -1){
867
error(0, errno, "Failed to create /dev/fd symlink");
868
}
869
}
870
}
871
872
/* Lower permissions */
873
ret = setgid(gid);
874
if(ret == -1){
875
error(0, errno, "setgid");
876
}
877
557
ret = setuid(uid);
878
if(ret == -1){
879
error(0, errno, "setuid");
880
}
881
882
/* Open plugin directory with close_on_exec flag */
558
if (ret == -1){
559
perror("setuid");
560
}
561
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
571
}
572
573
if(dir == NULL){
574
perror("Could not open plugin dir");
575
exitstatus = EXIT_FAILURE;
576
goto fallback;
577
}
578
579
/* Set the FD_CLOEXEC flag on the directory, if possible */
883
580
{
884
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
885
#ifdef O_CLOEXEC
886
O_CLOEXEC
887
#else /* not O_CLOEXEC */
888
0
889
#endif /* not O_CLOEXEC */
890
);
891
if(dir_fd == -1){
892
error(0, errno, "Could not open plugin dir");
893
exitstatus = EX_UNAVAILABLE;
894
goto fallback;
895
}
896
897
#ifndef O_CLOEXEC
898
/* Set the FD_CLOEXEC flag on the directory */
899
ret = set_cloexec_flag(dir_fd);
900
if(ret < 0){
901
error(0, errno, "set_cloexec_flag");
902
exitstatus = EX_OSERR;
903
goto fallback;
904
}
905
#endif /* O_CLOEXEC */
906
}
907
908
int good_name(const struct dirent * const dirent){
909
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
910
"*.dpkg-old", "*.dpkg-bak",
911
"*.dpkg-divert", NULL };
912
#ifdef __GNUC__
913
#pragma GCC diagnostic push
914
#pragma GCC diagnostic ignored "-Wcast-qual"
915
#endif
916
for(const char **pat = (const char **)patterns;
917
*pat != NULL; pat++){
918
#ifdef __GNUC__
919
#pragma GCC diagnostic pop
920
#endif
921
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
922
!= FNM_NOMATCH){
923
if(debug){
924
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
925
" matching pattern %s\n", dirent->d_name, *pat);
926
}
927
return 0;
581
int dir_fd = dirfd(dir);
582
if(dir_fd >= 0){
583
ret = set_cloexec_flag(dir_fd);
584
if(ret < 0){
585
perror("set_cloexec_flag");
586
exitstatus = EXIT_FAILURE;
587
goto fallback;
928
588
}
929
589
}
930
return 1;
931
}
932
933
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
934
alphasort);
935
if(numplugins == -1){
936
error(0, errno, "Could not scan plugin dir");
937
direntries = NULL;
938
exitstatus = EX_OSERR;
939
goto fallback;
940
590
}
941
591
942
592
FD_ZERO(&rfds_all);
943
593
944
/* Read and execute any executable in the plugin directory*/
945
for(int i = 0; i < numplugins; i++){
946
947
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
948
if(plugin_fd == -1){
949
error(0, errno, "Could not open plugin");
950
free(direntries[i]);
951
continue;
952
}
953
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
954
if(ret == -1){
955
error(0, errno, "stat");
956
close(plugin_fd);
957
free(direntries[i]);
958
continue;
959
}
960
961
/* Ignore non-executable files */
962
if(not S_ISREG(st.st_mode)
963
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
964
X_OK, 0)) != 0)){
594
while(true){
595
dirst = readdir(dir);
596
597
// All directory entries have been processed
598
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
break;
605
}
606
607
d_name_len = strlen(dirst->d_name);
608
609
// Ignore dotfiles, backup files and other junk
610
{
611
bool bad_name = false;
612
613
const char const *bad_prefixes[] = { ".", "#", NULL };
614
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
".dpkg-old",
617
".dpkg-divert", NULL };
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
size_t pre_len = strlen(*pre);
620
if((d_name_len >= pre_len)
621
and strncmp((dirst->d_name), *pre, pre_len) == 0){
622
if(debug){
623
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
624
" with bad prefix %s\n", dirst->d_name, *pre);
625
}
626
bad_name = true;
627
break;
628
}
629
}
630
631
if(bad_name){
632
continue;
633
}
634
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
size_t suf_len = strlen(*suf);
637
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
639
== 0)){
640
if(debug){
641
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
642
" with bad suffix %s\n", dirst->d_name, *suf);
643
}
644
bad_name = true;
645
break;
646
}
647
}
648
649
if(bad_name){
650
continue;
651
}
652
}
653
654
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
656
if(ret < 0){
657
perror("asprintf");
658
continue;
659
}
660
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
664
free(filename);
665
continue;
666
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
965
669
if(debug){
966
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
967
" with bad type or mode\n",
968
plugindir != NULL ? plugindir : PDIR,
969
direntries[i]->d_name);
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
" with bad type or mode\n", filename);
970
672
}
971
close(plugin_fd);
972
free(direntries[i]);
673
free(filename);
973
674
continue;
974
675
}
975
976
plugin *p = getplugin(direntries[i]->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
977
677
if(p == NULL){
978
error(0, errno, "getplugin");
979
close(plugin_fd);
980
free(direntries[i]);
678
perror("getplugin");
679
free(filename);
981
680
continue;
982
681
}
983
682
if(p->disabled){
984
683
if(debug){
985
684
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
986
direntries[i]->d_name);
685
dirst->d_name);
987
686
}
988
close(plugin_fd);
989
free(direntries[i]);
687
free(filename);
990
688
continue;
991
689
}
992
690
{
993
691
/* Add global arguments to argument list for this plugin */
994
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
995
693
if(g != NULL){
996
694
for(char **a = g->argv + 1; *a != NULL; a++){
997
695
if(not add_argument(p, *a)){
998
error(0, errno, "add_argument");
696
perror("add_argument");
999
697
}
1000
698
}
1001
699
/* Add global environment variables */
1002
700
for(char **e = g->environ; *e != NULL; e++){
1003
if(not add_environment(p, *e, false)){
1004
error(0, errno, "add_environment");
701
if(not add_environment(p, *e)){
702
perror("add_environment");
1005
703
}
1006
704
}
1007
705
}
1008
706
}
1009
/* If this plugin has any environment variables, we need to
1010
duplicate the environment from this process, too. */
707
/* If this plugin has any environment variables, we will call
708
using execve and need to duplicate the environment from this
709
process, too. */
1011
710
if(p->environ[0] != NULL){
1012
711
for(char **e = environ; *e != NULL; e++){
1013
if(not add_environment(p, *e, false)){
1014
error(0, errno, "add_environment");
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
1015
719
}
1016
720
}
1017
721
}
1018
722
1019
723
int pipefd[2];
1020
#ifndef O_CLOEXEC
1021
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1022
#else /* O_CLOEXEC */
1023
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1024
#endif /* O_CLOEXEC */
1025
if(ret == -1){
1026
error(0, errno, "pipe");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
if(pipefd[0] >= FD_SETSIZE){
1032
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1033
FD_SETSIZE);
1034
close(pipefd[0]);
1035
close(pipefd[1]);
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
1038
goto fallback;
1039
}
1040
#ifndef O_CLOEXEC
1041
/* Ask OS to automatic close the pipe on exec */
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
728
goto fallback;
729
}
1042
730
ret = set_cloexec_flag(pipefd[0]);
1043
731
if(ret < 0){
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
1049
734
goto fallback;
1050
735
}
1051
736
ret = set_cloexec_flag(pipefd[1]);
1052
737
if(ret < 0){
1053
error(0, errno, "set_cloexec_flag");
1054
close(pipefd[0]);
1055
close(pipefd[1]);
1056
exitstatus = EX_OSERR;
1057
free(direntries[i]);
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
1058
740
goto fallback;
1059
741
}
1060
#endif /* not O_CLOEXEC */
1061
742
/* Block SIGCHLD until process is safely in process list */
1062
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1063
&sigchld_action.sa_mask,
1064
NULL));
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1065
744
if(ret < 0){
1066
error(0, errno, "sigprocmask");
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
1069
747
goto fallback;
1070
748
}
1071
/* Starting a new process to be watched */
1072
pid_t pid;
1073
do {
1074
pid = fork();
1075
} while(pid == -1 and errno == EINTR);
749
// Starting a new process to be watched
750
pid_t pid = fork();
1076
751
if(pid == -1){
1077
error(0, errno, "fork");
1078
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask, NULL));
1080
close(pipefd[0]);
1081
close(pipefd[1]);
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
1084
754
goto fallback;
1085
755
}
1086
756
if(pid == 0){
1087
757
/* this is the child process */
1088
758
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1089
759
if(ret < 0){
1090
error(0, errno, "sigaction");
1091
_exit(EX_OSERR);
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1092
762
}
1093
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1094
764
if(ret < 0){
1095
error(0, errno, "sigprocmask");
1096
_exit(EX_OSERR);
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1097
767
}
1098
768
1099
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1100
770
if(ret == -1){
1101
error(0, errno, "dup2");
1102
_exit(EX_OSERR);
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1103
773
}
1104
774
1105
if(fexecve(plugin_fd, p->argv,
1106
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1107
error(0, errno, "fexecve for %s/%s",
1108
plugindir != NULL ? plugindir : PDIR,
1109
direntries[i]->d_name);
1110
_exit(EX_OSERR);
775
if(dirfd(dir) < 0){
776
/* If dir has no file descriptor, we could not set FD_CLOEXEC
777
above and must now close it manually here. */
778
closedir(dir);
779
}
780
if(p->environ[0] == NULL){
781
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
784
}
785
} else {
786
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
789
}
1111
790
}
1112
791
/* no return */
1113
792
}
1114
/* Parent process */
1115
close(pipefd[1]); /* Close unused write end of pipe */
1116
close(plugin_fd);
1117
plugin *new_plugin = getplugin(direntries[i]->d_name);
1118
if(new_plugin == NULL){
1119
error(0, errno, "getplugin");
1120
ret = (int)(TEMP_FAILURE_RETRY
1121
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1122
NULL)));
793
/* parent process */
794
free(filename);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1123
800
if(ret < 0){
1124
error(0, errno, "sigprocmask");
801
perror("sigprocmask");
1125
802
}
1126
exitstatus = EX_OSERR;
1127
free(direntries[i]);
803
exitstatus = EXIT_FAILURE;
1128
804
goto fallback;
1129
805
}
1130
free(direntries[i]);
1131
806
1132
new_plugin->pid = pid;
1133
new_plugin->fd = pipefd[0];
1134
1135
if(debug){
1136
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1137
new_plugin->name, (intmax_t) (new_plugin->pid));
1138
}
1139
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1140
812
/* Unblock SIGCHLD so signal handler can be run if this process
1141
813
has already completed */
1142
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1143
&sigchld_action.sa_mask,
1144
NULL));
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1145
815
if(ret < 0){
1146
error(0, errno, "sigprocmask");
1147
exitstatus = EX_OSERR;
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1148
818
goto fallback;
1149
819
}
1150
820
1151
FD_SET(new_plugin->fd, &rfds_all);
1152
1153
if(maxfd < new_plugin->fd){
1154
maxfd = new_plugin->fd;
1155
}
1156
}
1157
1158
free(direntries);
1159
direntries = NULL;
1160
close(dir_fd);
1161
dir_fd = -1;
1162
free_plugin(getplugin(NULL));
1163
1164
for(plugin *p = plugin_list; p != NULL; p = p->next){
1165
if(p->pid != 0){
1166
break;
1167
}
1168
if(p->next == NULL){
1169
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1170
" directory?\n");
1171
free_plugin_list();
1172
}
1173
}
1174
1175
/* Main loop while running plugins exist */
1176
while(plugin_list){
821
FD_SET(new_process->fd, &rfds_all);
822
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
825
}
826
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
832
closedir(dir);
833
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
839
}
840
while(process_list){
1177
841
fd_set rfds = rfds_all;
1178
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1179
if(select_ret == -1 and errno != EINTR){
1180
error(0, errno, "select");
1181
exitstatus = EX_OSERR;
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1182
846
goto fallback;
1183
847
}
1184
848
/* OK, now either a process completed, or something can be read
1185
849
from one of them */
1186
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
1187
851
/* Is this process completely done? */
1188
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
1189
853
/* Only accept the plugin output if it exited cleanly */
1190
854
if(not WIFEXITED(proc->status)
1191
855
or WEXITSTATUS(proc->status) != 0){
1192
856
/* Bad exit by plugin */
1193
1194
857
if(debug){
1195
858
if(WIFEXITED(proc->status)){
1196
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1197
" status %d\n", proc->name,
1198
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1199
861
WEXITSTATUS(proc->status));
1200
} else if(WIFSIGNALED(proc->status)){
1201
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1202
" signal %d: %s\n", proc->name,
1203
(intmax_t) (proc->pid),
1204
WTERMSIG(proc->status),
1205
strsignal(WTERMSIG(proc->status)));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
866
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1206
869
}
1207
870
}
1208
1209
871
/* Remove the plugin */
1210
872
FD_CLR(proc->fd, &rfds_all);
1211
1212
873
/* Block signal while modifying process_list */
1213
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1214
(SIG_BLOCK,
1215
&sigchld_action.sa_mask,
1216
NULL));
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1217
875
if(ret < 0){
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1220
878
goto fallback;
1221
879
}
1222
1223
plugin *next_plugin = proc->next;
1224
free_plugin(proc);
1225
proc = next_plugin;
1226
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1227
893
/* We are done modifying process list, so unblock signal */
1228
ret = (int)(TEMP_FAILURE_RETRY
1229
(sigprocmask(SIG_UNBLOCK,
1230
&sigchld_action.sa_mask, NULL)));
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1231
896
if(ret < 0){
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
1234
goto fallback;
1235
}
1236
1237
if(plugin_list == NULL){
1238
break;
1239
}
1240
1241
continue;
897
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1242
905
}
1243
1244
906
/* This process exited nicely, so print its buffer */
1245
907
1246
908
bool bret = print_out_password(proc->buffer,
1247
909
proc->buffer_length);
1248
910
if(not bret){
1249
error(0, errno, "print_out_password");
1250
exitstatus = EX_IOERR;
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1251
913
}
1252
914
goto fallback;
1253
915
}
1254
1255
916
/* This process has not completed. Does it have any output? */
1256
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1257
918
/* This process had nothing to say at this time */
1258
proc = proc->next;
1259
919
continue;
1260
920
}
1261
921
/* Before reading, make the process' data buffer large enough */
1262
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1263
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1264
+ (size_t) BUFFER_SIZE);
1265
if(new_buffer == NULL){
1266
error(0, errno, "malloc");
1267
exitstatus = EX_OSERR;
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1268
928
goto fallback;
1269
929
}
1270
proc->buffer = new_buffer;
1271
930
proc->buffer_size += BUFFER_SIZE;
1272
931
}
1273
932
/* Read from the process */
1274
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1275
proc->buffer
1276
+ proc->buffer_length,
1277
BUFFER_SIZE));
1278
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1279
936
/* Read error from this process; ignore the error */
1280
proc = proc->next;
1281
937
continue;
1282
938
}
1283
if(sret == 0){
939
if(ret == 0){
1284
940
/* got EOF */
1285
941
proc->eof = true;
1286
942
} else {
1287
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1288
944
}
1289
945
}
1290
946
}
1291
1292
947
948
1293
949
fallback:
1294
950
1295
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1296
and exitstatus != EX_OK)){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1297
952
/* Fallback if all plugins failed, none are found or an error
1298
953
occured */
1299
954
bool bret;
1300
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1301
956
char *passwordbuffer = getpass("Password: ");
1302
size_t len = strlen(passwordbuffer);
1303
/* Strip trailing newline */
1304
if(len > 0 and passwordbuffer[len-1] == '\n'){
1305
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1306
len--;
1307
}
1308
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1309
958
if(not bret){
1310
error(0, errno, "print_out_password");
1311
exitstatus = EX_IOERR;
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1312
961
}
1313
962
}
1314
963
1315
964
/* Restore old signal handler */
1316
965
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1317
966
if(ret == -1){
1318
error(0, errno, "sigaction");
1319
exitstatus = EX_OSERR;
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1320
969
}
1321
970
1322
971
if(custom_argv != NULL){
1323
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1324
973
free(*arg);
1325
974
}
1326
975
free(custom_argv);
1327
976
}
1328
1329
free(direntries);
1330
1331
if(dir_fd != -1){
1332
close(dir_fd);
977
free_plugin_list(plugin_list);
978
979
if(dir != NULL){
980
closedir(dir);
1333
981
}
1334
982
1335
/* Kill the processes */
1336
for(plugin *p = plugin_list; p != NULL; p = p->next){
1337
if(p->pid != 0){
1338
close(p->fd);
1339
ret = kill(p->pid, SIGTERM);
1340
if(ret == -1 and errno != ESRCH){
1341
/* Set-uid proccesses might not get closed */
1342
error(0, errno, "kill");
1343
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1344
991
}
992
free(process_list->buffer);
993
free(process_list);
1345
994
}
1346
995
1347
996
/* Wait for any remaining child processes to terminate */
1348
do {
997
do{
1349
998
ret = wait(NULL);
1350
999
} while(ret >= 0);
1351
1000
if(errno != ECHILD){
1352
error(0, errno, "wait");
1001
perror("wait");
1353
1002
}
1354
1355
free_plugin_list();
1356
1003
1357
1004
free(plugindir);
1358
free(pluginhelperdir);
1359
1005
free(argfile);
1360
1006
1361
1007
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0