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- Committer: Teddy Hogeborn
- Date: 2019-02-10 03:54:09 UTC
- Revision ID: teddy@recompile.se-20190210035409-l2mqp2ftzkggwybz
Do minor fix to make mandos-monitor work with new python-urwid
* mandos-monitor (UserInterface.log): Initialize to an
urwid.SimpleListWalker([]), not
an empty list.
(UserInterface.log_message_raw): Fix off-by-one error.
* mandos-monitor (UserInterface.log): Initialize to an
urwid.SimpleListWalker([]), not
an empty list.
(UserInterface.log_message_raw): Fix off-by-one error.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
29
31
#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() */
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() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#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() */
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
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#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() */
66
75
67
76
#define BUFFER_SIZE 256
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;
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
86
84
87
85
typedef struct plugin{
88
86
char *name; /* can be NULL or any plugin name */
91
89
char **environ;
92
90
int envc;
93
91
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;
94
102
struct plugin *next;
95
103
} plugin;
96
104
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))){
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))){
101
115
return p;
102
116
}
103
117
}
104
118
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
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
124
return NULL;
108
125
}
109
126
char *copy_name = NULL;
110
127
if(name != NULL){
111
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
112
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
113
135
return NULL;
114
136
}
115
137
}
116
138
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
122
143
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
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
149
free(copy_name);
126
150
free(new_plugin);
151
errno = e;
127
152
return NULL;
128
153
}
129
154
new_plugin->argv[0] = copy_name;
130
155
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
133
160
if(new_plugin->environ == NULL){
161
int e = errno;
134
162
free(copy_name);
135
163
free(new_plugin->argv);
136
164
free(new_plugin);
165
errno = e;
137
166
return NULL;
138
167
}
139
168
new_plugin->environ[0] = NULL;
169
140
170
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
142
172
return new_plugin;
143
173
}
144
174
145
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
146
177
static bool add_to_char_array(const char *new, char ***array,
147
178
int *len){
148
179
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
151
185
/* Malloc check */
152
if(*array == NULL){
186
if(new_array == NULL){
153
187
return false;
154
188
}
189
*array = new_array;
155
190
/* Make a copy of the new string */
156
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
157
195
if(copy == NULL){
158
196
return false;
159
197
}
166
204
}
167
205
168
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
169
208
static bool add_argument(plugin *p, const char *arg){
170
209
if(p == NULL){
171
210
return false;
174
213
}
175
214
176
215
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
178
218
if(p == NULL){
179
219
return false;
180
220
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
181
241
return add_to_char_array(def, &(p->environ), &(p->envc));
182
242
}
183
243
184
244
#ifndef O_CLOEXEC
185
245
/*
186
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
247
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
249
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
193
253
/* If reading the flags failed, return error indication now. */
194
254
if(ret < 0){
195
255
return ret;
196
256
}
197
257
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
199
260
}
261
#endif /* not O_CLOEXEC */
200
262
201
process *process_list = NULL;
202
263
203
264
/* Mark processes as completed when they exit, and save their exit
204
265
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
206
268
while(true){
207
process *proc = process_list;
269
plugin *proc = plugin_list;
208
270
int status;
209
271
pid_t pid = waitpid(-1, &status, WNOHANG);
210
272
if(pid == 0){
212
274
break;
213
275
}
214
276
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
217
280
}
218
/* No child processes */
219
break;
281
error(0, errno, "waitpid");
220
282
}
221
283
222
284
/* A child exited, find it in process_list */
223
285
while(proc != NULL and proc->pid != pid){
224
286
proc = proc->next;
228
290
continue;
229
291
}
230
292
proc->status = status;
231
proc->completed = true;
293
proc->completed = 1;
232
294
}
295
errno = old_errno;
233
296
}
234
297
235
bool print_out_password(const char *buffer, size_t length){
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
236
301
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
302
for(size_t written = 0; written < length; written += (size_t)ret){
241
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
304
length - written));
247
309
return true;
248
310
}
249
311
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
static void free_plugin(plugin *plugin_node){
315
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->argv);
320
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(*env);
322
}
323
free(plugin_node->environ);
324
free(plugin_node->buffer);
325
326
/* Removes the plugin from the singly-linked list */
327
if(plugin_node == plugin_list){
328
/* First one - simple */
329
plugin_list = plugin_list->next;
330
} else {
331
/* Second one or later */
332
for(plugin *p = plugin_list; p != NULL; p = p->next){
333
if(p->next == plugin_node){
334
p->next = plugin_node->next;
335
break;
336
}
256
337
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
258
argv[1] = NULL;
259
}
260
*argc += 1;
261
argv = realloc(argv, sizeof(char *)
262
* ((unsigned int) *argc + 1));
263
if(argv == NULL){
264
return NULL;
265
}
266
argv[*argc-1] = arg;
267
argv[*argc] = NULL;
268
return argv;
338
}
339
340
free(plugin_node);
269
341
}
270
342
271
static void free_plugin_list(plugin *plugin_list){
272
for(plugin *next; plugin_list != NULL; plugin_list = next){
273
next = plugin_list->next;
274
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_list->argv);
278
for(char **env = plugin_list->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_list->environ);
282
free(plugin_list);
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
283
346
}
284
347
}
285
348
286
349
int main(int argc, char *argv[]){
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
289
353
FILE *conffp;
290
size_t d_name_len;
291
DIR *dir = NULL;
292
struct dirent *dirst;
354
struct dirent **direntries = NULL;
293
355
struct stat st;
294
356
fd_set rfds_all;
295
357
int ret, maxfd = 0;
358
ssize_t sret;
296
359
uid_t uid = 65534;
297
360
gid_t gid = 65534;
298
361
bool debug = false;
302
365
.sa_flags = SA_NOCLDSTOP };
303
366
char **custom_argv = NULL;
304
367
int custom_argc = 0;
368
int dir_fd = -1;
305
369
306
370
/* Establish a signal handler */
307
371
sigemptyset(&sigchld_action.sa_mask);
308
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
309
373
if(ret == -1){
310
perror("sigaddset");
311
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
312
376
goto fallback;
313
377
}
314
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
315
379
if(ret == -1){
316
perror("sigaction");
317
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
318
382
goto fallback;
319
383
}
320
384
323
387
{ .name = "global-options", .key = 'g',
324
388
.arg = "OPTION[,OPTION[,...]]",
325
389
.doc = "Options passed to all plugins" },
326
{ .name = "global-envs", .key = 'e',
390
{ .name = "global-env", .key = 'G',
327
391
.arg = "VAR=value",
328
392
.doc = "Environment variable passed to all plugins" },
329
393
{ .name = "options-for", .key = 'o',
330
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
331
395
.doc = "Options passed only to specified plugin" },
332
{ .name = "envs-for", .key = 'f',
396
{ .name = "env-for", .key = 'E',
333
397
.arg = "PLUGIN:ENV=value",
334
398
.doc = "Environment variable passed to specified plugin" },
335
399
{ .name = "disable", .key = 'd',
336
400
.arg = "PLUGIN",
337
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
338
405
{ .name = "plugin-dir", .key = 128,
339
406
.arg = "DIRECTORY",
340
407
.doc = "Specify a different plugin directory", .group = 2 },
341
{ .name = "userid", .key = 129,
342
.arg = "ID", .flags = 0,
343
.doc = "User ID the plugins will run as", .group = 2 },
344
{ .name = "groupid", .key = 130,
345
.arg = "ID", .flags = 0,
346
.doc = "Group ID the plugins will run as", .group = 2 },
347
{ .name = "debug", .key = 131,
348
.doc = "Debug mode", .group = 3 },
408
{ .name = "config-file", .key = 129,
409
.arg = "FILE",
410
.doc = "Specify a different configuration file", .group = 2 },
411
{ .name = "userid", .key = 130,
412
.arg = "ID", .flags = 0,
413
.doc = "User ID the plugins will run as", .group = 3 },
414
{ .name = "groupid", .key = 131,
415
.arg = "ID", .flags = 0,
416
.doc = "Group ID the plugins will run as", .group = 3 },
417
{ .name = "debug", .key = 132,
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
349
432
{ .name = NULL }
350
433
};
351
434
352
error_t parse_opt (int key, char *arg, struct argp_state *state) {
353
/* Get the INPUT argument from `argp_parse', which we know is a
354
pointer to our plugin list pointer. */
355
plugin **plugins = state->input;
356
switch (key) {
357
case 'g':
358
if (arg != NULL){
359
char *p;
360
while((p = strsep(&arg, ",")) != NULL){
361
if(p[0] == '\0'){
362
continue;
363
}
364
if(not add_argument(getplugin(NULL, plugins), p)){
365
perror("add_argument");
366
return ARGP_ERR_UNKNOWN;
367
}
368
}
369
}
370
break;
371
case 'e':
372
if(arg == NULL){
373
break;
374
}
375
{
376
char *envdef = strdup(arg);
377
if(envdef == NULL){
378
break;
379
}
380
if(not add_environment(getplugin(NULL, plugins), envdef)){
381
perror("add_environment");
382
}
383
}
384
break;
385
case 'o':
386
if (arg != NULL){
387
char *p_name = strsep(&arg, ":");
388
if(p_name[0] == '\0'){
389
break;
390
}
391
char *opt = strsep(&arg, ":");
392
if(opt[0] == '\0'){
393
break;
394
}
395
if(opt != NULL){
396
char *p;
397
while((p = strsep(&opt, ",")) != NULL){
398
if(p[0] == '\0'){
399
continue;
400
}
401
if(not add_argument(getplugin(p_name, plugins), p)){
402
perror("add_argument");
403
return ARGP_ERR_UNKNOWN;
404
}
405
}
406
}
407
}
408
break;
409
case 'f':
410
if(arg == NULL){
411
break;
412
}
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
441
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
447
}
448
}
449
errno = 0;
450
}
451
break;
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
456
break;
457
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
479
}
480
break;
481
case 'E': /* --env-for */
413
482
{
414
483
char *envdef = strchr(arg, ':');
415
484
if(envdef == NULL){
416
break;
417
}
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(p_name == NULL){
420
break;
421
}
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
422
490
envdef++;
423
if(not add_environment(getplugin(p_name, plugins), envdef)){
424
perror("add_environment");
425
}
426
}
427
break;
428
case 'd':
429
if (arg != NULL){
430
plugin *p = getplugin(arg, plugins);
431
if(p == NULL){
432
return ARGP_ERR_UNKNOWN;
433
}
434
p->disabled = true;
435
}
436
break;
437
case 128:
438
plugindir = arg;
439
break;
440
case 129:
441
uid = (uid_t)strtol(arg, NULL, 10);
442
break;
443
case 130:
444
gid = (gid_t)strtol(arg, NULL, 10);
445
break;
446
case 131:
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
499
}
500
break;
501
case 'd': /* --disable */
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
517
}
518
break;
519
case 128: /* --plugin-dir */
520
free(plugindir);
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
break;
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
break;
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
break;
551
case 132: /* --debug */
447
552
debug = true;
448
553
break;
449
case ARGP_KEY_ARG:
450
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
break;
452
case ARGP_KEY_END:
453
break;
454
default:
455
return ARGP_ERR_UNKNOWN;
456
}
457
return 0;
458
}
459
460
plugin *plugin_list = NULL;
461
462
struct argp argp = { .options = options, .parser = parse_opt,
463
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
/* FALLTHROUGH */
587
default:
588
return ARGP_ERR_UNKNOWN;
589
}
590
return errno; /* Set to 0 at start */
591
}
592
593
/* This option parser is the same as parse_opt() above, except it
594
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
600
case 'g': /* --global-options */
601
case 'G': /* --global-env */
602
case 'o': /* --options-for */
603
case 'E': /* --env-for */
604
case 'd': /* --disable */
605
case 'e': /* --enable */
606
case 128: /* --plugin-dir */
607
break;
608
case 129: /* --config-file */
609
free(argfile);
610
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
613
}
614
break;
615
case 130: /* --userid */
616
case 131: /* --groupid */
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
622
case ARGP_KEY_ARG:
623
break;
624
default:
625
return ARGP_ERR_UNKNOWN;
626
}
627
return errno;
628
}
629
630
struct argp argp = { .options = options,
631
.parser = parse_opt_config_file,
632
.args_doc = "",
464
633
.doc = "Mandos plugin runner -- Run plugins" };
465
634
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
if (ret == ARGP_ERR_UNKNOWN){
468
fprintf(stderr, "Unknown error while parsing arguments\n");
469
exitstatus = EXIT_FAILURE;
470
goto fallback;
471
}
472
473
conffp = fopen(argfile, "r");
635
/* Parse using parse_opt_config_file() in order to get the custom
636
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
639
NULL, NULL);
640
switch(ret){
641
case 0:
642
break;
643
case ENOMEM:
644
default:
645
errno = ret;
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
648
goto fallback;
649
case EINVAL:
650
exitstatus = EX_USAGE;
651
goto fallback;
652
}
653
654
/* Reset to the normal argument parser */
655
argp.parser = parse_opt;
656
657
/* Open the configfile if available */
658
if(argfile == NULL){
659
conffp = fopen(AFILE, "r");
660
} else {
661
conffp = fopen(argfile, "r");
662
}
474
663
if(conffp != NULL){
475
664
char *org_line = NULL;
476
665
char *p, *arg, *new_arg, *line;
477
666
size_t size = 0;
478
ssize_t sret;
479
667
const char whitespace_delims[] = " \r\t\f\v\n";
480
668
const char comment_delim[] = "#";
481
669
670
custom_argc = 1;
671
custom_argv = malloc(sizeof(char*) * 2);
672
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
675
goto fallback;
676
}
677
custom_argv[0] = argv[0];
678
custom_argv[1] = NULL;
679
680
/* for each line in the config file, strip whitespace and ignore
681
commented text */
482
682
while(true){
483
683
sret = getline(&org_line, &size, conffp);
484
684
if(sret == -1){
485
685
break;
486
686
}
487
687
488
688
line = org_line;
489
689
arg = strsep(&line, comment_delim);
490
690
while((p = strsep(&arg, whitespace_delims)) != NULL){
492
692
continue;
493
693
}
494
694
new_arg = strdup(p);
495
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
496
if (custom_argv == NULL){
497
perror("add_to_argv");
498
exitstatus = EXIT_FAILURE;
695
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
698
free(org_line);
499
699
goto fallback;
500
700
}
701
702
custom_argc += 1;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
715
}
716
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
501
718
}
502
719
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
503
728
free(org_line);
504
} else{
729
} else {
505
730
/* Check for harmful errors and go to fallback. Other errors might
506
731
not affect opening plugins */
507
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
perror("fopen");
509
exitstatus = EXIT_FAILURE;
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
510
735
goto fallback;
511
736
}
512
737
}
513
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
514
740
if(custom_argv != NULL){
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
517
if (ret == ARGP_ERR_UNKNOWN){
518
fprintf(stderr, "Unknown error while parsing arguments\n");
519
exitstatus = EXIT_FAILURE;
520
goto fallback;
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
755
goto fallback;
756
}
757
}
758
759
/* Parse actual command line arguments, to let them override the
760
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
521
793
}
522
794
}
523
795
524
796
if(debug){
525
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
526
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
527
799
p->name ? p->name : "Global", p->argc - 1);
528
800
for(char **a = p->argv; *a != NULL; a++){
529
801
fprintf(stderr, "\tArg: %s\n", *a);
530
802
}
531
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
532
804
for(char **a = p->environ; *a != NULL; a++){
533
805
fprintf(stderr, "\t%s\n", *a);
534
806
}
535
807
}
536
808
}
537
809
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
538
839
ret = setuid(uid);
539
if (ret == -1){
540
perror("setuid");
541
}
542
543
setgid(gid);
544
if (ret == -1){
545
perror("setgid");
546
}
547
548
dir = opendir(plugindir);
549
if(dir == NULL){
550
perror("Could not open plugin dir");
551
exitstatus = EXIT_FAILURE;
552
goto fallback;
553
}
554
555
/* Set the FD_CLOEXEC flag on the directory, if possible */
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
556
845
{
557
int dir_fd = dirfd(dir);
558
if(dir_fd >= 0){
559
ret = set_cloexec_flag(dir_fd);
560
if(ret < 0){
561
perror("set_cloexec_flag");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
564
890
}
565
891
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
566
902
}
567
903
568
904
FD_ZERO(&rfds_all);
569
905
570
while(true){
571
dirst = readdir(dir);
572
573
// All directory entries have been processed
574
if(dirst == NULL){
575
if (errno == EBADF){
576
perror("readdir");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
break;
581
}
582
583
d_name_len = strlen(dirst->d_name);
584
585
// Ignore dotfiles, backup files and other junk
586
{
587
bool bad_name = false;
588
589
const char const *bad_prefixes[] = { ".", "#", NULL };
590
591
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
592
".dpkg-old",
593
".dpkg-divert", NULL };
594
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
595
size_t pre_len = strlen(*pre);
596
if((d_name_len >= pre_len)
597
and strncmp((dirst->d_name), *pre, pre_len) == 0){
598
if(debug){
599
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
600
" with bad prefix %s\n", dirst->d_name, *pre);
601
}
602
bad_name = true;
603
break;
604
}
605
}
606
607
if(bad_name){
608
continue;
609
}
610
611
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
612
size_t suf_len = strlen(*suf);
613
if((d_name_len >= suf_len)
614
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
615
== 0)){
616
if(debug){
617
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
618
" with bad suffix %s\n", dirst->d_name, *suf);
619
}
620
bad_name = true;
621
break;
622
}
623
}
624
625
if(bad_name){
626
continue;
627
}
628
}
629
630
char *filename;
631
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
632
if(ret < 0){
633
perror("asprintf");
634
continue;
635
}
636
637
ret = stat(filename, &st);
638
if (ret == -1){
639
perror("stat");
640
free(filename);
641
continue;
642
}
643
644
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
906
/* Read and execute any executable in the plugin directory*/
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
913
continue;
914
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
920
continue;
921
}
922
923
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
645
927
if(debug){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
648
932
}
649
free(filename);
933
close(plugin_fd);
934
free(direntries[i]);
650
935
continue;
651
936
}
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
937
938
plugin *p = getplugin(direntries[i]->d_name);
653
939
if(p == NULL){
654
perror("getplugin");
655
free(filename);
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
656
943
continue;
657
944
}
658
945
if(p->disabled){
659
946
if(debug){
660
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
661
dirst->d_name);
948
direntries[i]->d_name);
662
949
}
663
free(filename);
950
close(plugin_fd);
951
free(direntries[i]);
664
952
continue;
665
953
}
666
954
{
667
955
/* Add global arguments to argument list for this plugin */
668
plugin *g = getplugin(NULL, &plugin_list);
956
plugin *g = getplugin(NULL);
669
957
if(g != NULL){
670
958
for(char **a = g->argv + 1; *a != NULL; a++){
671
959
if(not add_argument(p, *a)){
672
perror("add_argument");
960
error(0, errno, "add_argument");
673
961
}
674
962
}
675
963
/* Add global environment variables */
676
964
for(char **e = g->environ; *e != NULL; e++){
677
if(not add_environment(p, *e)){
678
perror("add_environment");
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
679
967
}
680
968
}
681
969
}
682
970
}
683
/* If this plugin has any environment variables, we will call
684
using execve and need to duplicate the environment from this
685
process, too. */
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
686
973
if(p->environ[0] != NULL){
687
974
for(char **e = environ; *e != NULL; e++){
688
char *copy = strdup(*e);
689
if(copy == NULL){
690
perror("strdup");
691
continue;
692
}
693
if(not add_environment(p, copy)){
694
perror("add_environment");
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
695
977
}
696
978
}
697
979
}
698
980
699
981
int pipefd[2];
700
ret = pipe(pipefd);
701
if (ret == -1){
702
perror("pipe");
703
exitstatus = EXIT_FAILURE;
704
goto fallback;
705
}
982
#ifndef O_CLOEXEC
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
987
if(ret == -1){
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
1003
/* Ask OS to automatic close the pipe on exec */
706
1004
ret = set_cloexec_flag(pipefd[0]);
707
1005
if(ret < 0){
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
710
1011
goto fallback;
711
1012
}
712
1013
ret = set_cloexec_flag(pipefd[1]);
713
1014
if(ret < 0){
714
perror("set_cloexec_flag");
715
exitstatus = EXIT_FAILURE;
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
716
1020
goto fallback;
717
1021
}
1022
#endif /* not O_CLOEXEC */
718
1023
/* Block SIGCHLD until process is safely in process list */
719
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
720
1027
if(ret < 0){
721
perror("sigprocmask");
722
exitstatus = EXIT_FAILURE;
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
723
1031
goto fallback;
724
1032
}
725
// Starting a new process to be watched
726
pid_t pid = fork();
1033
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
727
1038
if(pid == -1){
728
perror("fork");
729
exitstatus = EXIT_FAILURE;
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
730
1046
goto fallback;
731
1047
}
732
1048
if(pid == 0){
733
1049
/* this is the child process */
734
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
735
1051
if(ret < 0){
736
perror("sigaction");
737
_exit(EXIT_FAILURE);
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
738
1054
}
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
740
1056
if(ret < 0){
741
perror("sigprocmask");
742
_exit(EXIT_FAILURE);
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
743
1059
}
744
1060
745
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
746
1062
if(ret == -1){
747
perror("dup2");
748
_exit(EXIT_FAILURE);
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
749
1065
}
750
1066
751
if(dirfd(dir) < 0){
752
/* If dir has no file descriptor, we could not set FD_CLOEXEC
753
above and must now close it manually here. */
754
closedir(dir);
755
}
756
if(p->environ[0] == NULL){
757
if(execv(filename, p->argv) < 0){
758
perror("execv");
759
_exit(EXIT_FAILURE);
760
}
761
} else {
762
if(execve(filename, p->argv, p->environ) < 0){
763
perror("execve");
764
_exit(EXIT_FAILURE);
765
}
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
766
1073
}
767
1074
/* no return */
768
1075
}
769
/* parent process */
770
free(filename);
771
close(pipefd[1]); /* close unused write end of pipe */
772
process *new_process = malloc(sizeof(process));
773
if (new_process == NULL){
774
perror("malloc");
775
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1076
/* Parent process */
1077
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
776
1085
if(ret < 0){
777
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
778
1087
}
779
exitstatus = EXIT_FAILURE;
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
780
1090
goto fallback;
781
1091
}
1092
free(direntries[i]);
782
1093
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
1094
new_plugin->pid = pid;
1095
new_plugin->fd = pipefd[0];
1096
1097
if(debug){
1098
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1099
new_plugin->name, (intmax_t) (new_plugin->pid));
1100
}
1101
788
1102
/* Unblock SIGCHLD so signal handler can be run if this process
789
1103
has already completed */
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1104
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1105
&sigchld_action.sa_mask,
1106
NULL));
791
1107
if(ret < 0){
792
perror("sigprocmask");
793
exitstatus = EXIT_FAILURE;
1108
error(0, errno, "sigprocmask");
1109
exitstatus = EX_OSERR;
794
1110
goto fallback;
795
1111
}
796
1112
797
FD_SET(new_process->fd, &rfds_all);
798
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
801
}
802
803
}
804
805
free_plugin_list(plugin_list);
806
plugin_list = NULL;
807
808
closedir(dir);
809
dir = NULL;
810
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
" directory?\n");
814
process_list = NULL;
815
}
816
while(process_list){
1113
FD_SET(new_plugin->fd, &rfds_all);
1114
1115
if(maxfd < new_plugin->fd){
1116
maxfd = new_plugin->fd;
1117
}
1118
}
1119
1120
free(direntries);
1121
direntries = NULL;
1122
close(dir_fd);
1123
dir_fd = -1;
1124
free_plugin(getplugin(NULL));
1125
1126
for(plugin *p = plugin_list; p != NULL; p = p->next){
1127
if(p->pid != 0){
1128
break;
1129
}
1130
if(p->next == NULL){
1131
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1132
" directory?\n");
1133
free_plugin_list();
1134
}
1135
}
1136
1137
/* Main loop while running plugins exist */
1138
while(plugin_list){
817
1139
fd_set rfds = rfds_all;
818
1140
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
819
if (select_ret == -1){
820
perror("select");
821
exitstatus = EXIT_FAILURE;
1141
if(select_ret == -1 and errno != EINTR){
1142
error(0, errno, "select");
1143
exitstatus = EX_OSERR;
822
1144
goto fallback;
823
1145
}
824
1146
/* OK, now either a process completed, or something can be read
825
1147
from one of them */
826
for(process *proc = process_list; proc ; proc = proc->next){
1148
for(plugin *proc = plugin_list; proc != NULL;){
827
1149
/* Is this process completely done? */
828
if(proc->eof and proc->completed){
1150
if(proc->completed and proc->eof){
829
1151
/* Only accept the plugin output if it exited cleanly */
830
1152
if(not WIFEXITED(proc->status)
831
1153
or WEXITSTATUS(proc->status) != 0){
832
1154
/* Bad exit by plugin */
1155
833
1156
if(debug){
834
1157
if(WIFEXITED(proc->status)){
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1159
" status %d\n", proc->name,
1160
(intmax_t) (proc->pid),
837
1161
WEXITSTATUS(proc->status));
838
} else if(WIFSIGNALED(proc->status)) {
839
fprintf(stderr, "Plugin %u killed by signal %d\n",
840
(unsigned int) (proc->pid),
841
WTERMSIG(proc->status));
842
} else if(WCOREDUMP(proc->status)){
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
1162
} else if(WIFSIGNALED(proc->status)){
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1164
" signal %d: %s\n", proc->name,
1165
(intmax_t) (proc->pid),
1166
WTERMSIG(proc->status),
1167
strsignal(WTERMSIG(proc->status)));
845
1168
}
846
1169
}
1170
847
1171
/* Remove the plugin */
848
1172
FD_CLR(proc->fd, &rfds_all);
1173
849
1174
/* Block signal while modifying process_list */
850
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1175
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1176
(SIG_BLOCK,
1177
&sigchld_action.sa_mask,
1178
NULL));
851
1179
if(ret < 0){
852
perror("sigprocmask");
853
exitstatus = EXIT_FAILURE;
1180
error(0, errno, "sigprocmask");
1181
exitstatus = EX_OSERR;
854
1182
goto fallback;
855
1183
}
856
/* Delete this process entry from the list */
857
if(process_list == proc){
858
/* First one - simple */
859
process_list = proc->next;
860
} else {
861
/* Second one or later */
862
for(process *p = process_list; p != NULL; p = p->next){
863
if(p->next == proc){
864
p->next = proc->next;
865
break;
866
}
867
}
868
}
1184
1185
plugin *next_plugin = proc->next;
1186
free_plugin(proc);
1187
proc = next_plugin;
1188
869
1189
/* We are done modifying process list, so unblock signal */
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
NULL);
1190
ret = (int)(TEMP_FAILURE_RETRY
1191
(sigprocmask(SIG_UNBLOCK,
1192
&sigchld_action.sa_mask, NULL)));
872
1193
if(ret < 0){
873
perror("sigprocmask");
874
}
875
free(proc->buffer);
876
free(proc);
877
/* We deleted this process from the list, so we can't go
878
proc->next. Therefore, start over from the beginning of
879
the process list */
880
break;
1194
error(0, errno, "sigprocmask");
1195
exitstatus = EX_OSERR;
1196
goto fallback;
1197
}
1198
1199
if(plugin_list == NULL){
1200
break;
1201
}
1202
1203
continue;
881
1204
}
1205
882
1206
/* This process exited nicely, so print its buffer */
883
1207
884
1208
bool bret = print_out_password(proc->buffer,
885
1209
proc->buffer_length);
886
1210
if(not bret){
887
perror("print_out_password");
888
exitstatus = EXIT_FAILURE;
1211
error(0, errno, "print_out_password");
1212
exitstatus = EX_IOERR;
889
1213
}
890
1214
goto fallback;
891
1215
}
1216
892
1217
/* This process has not completed. Does it have any output? */
893
1218
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
894
1219
/* This process had nothing to say at this time */
1220
proc = proc->next;
895
1221
continue;
896
1222
}
897
1223
/* Before reading, make the process' data buffer large enough */
898
1224
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
899
proc->buffer = realloc(proc->buffer, proc->buffer_size
900
+ (size_t) BUFFER_SIZE);
901
if (proc->buffer == NULL){
902
perror("malloc");
903
exitstatus = EXIT_FAILURE;
1225
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1226
+ (size_t) BUFFER_SIZE);
1227
if(new_buffer == NULL){
1228
error(0, errno, "malloc");
1229
exitstatus = EX_OSERR;
904
1230
goto fallback;
905
1231
}
1232
proc->buffer = new_buffer;
906
1233
proc->buffer_size += BUFFER_SIZE;
907
1234
}
908
1235
/* Read from the process */
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
910
BUFFER_SIZE);
911
if(ret < 0){
1236
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1237
proc->buffer
1238
+ proc->buffer_length,
1239
BUFFER_SIZE));
1240
if(sret < 0){
912
1241
/* Read error from this process; ignore the error */
1242
proc = proc->next;
913
1243
continue;
914
1244
}
915
if(ret == 0){
1245
if(sret == 0){
916
1246
/* got EOF */
917
1247
proc->eof = true;
918
1248
} else {
919
proc->buffer_length += (size_t) ret;
1249
proc->buffer_length += (size_t) sret;
920
1250
}
921
1251
}
922
1252
}
923
924
1253
1254
925
1255
fallback:
926
1256
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1257
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1258
and exitstatus != EX_OK)){
928
1259
/* Fallback if all plugins failed, none are found or an error
929
1260
occured */
930
1261
bool bret;
931
1262
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
932
1263
char *passwordbuffer = getpass("Password: ");
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1264
size_t len = strlen(passwordbuffer);
1265
/* Strip trailing newline */
1266
if(len > 0 and passwordbuffer[len-1] == '\n'){
1267
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1268
len--;
1269
}
1270
bret = print_out_password(passwordbuffer, len);
934
1271
if(not bret){
935
perror("print_out_password");
936
exitstatus = EXIT_FAILURE;
1272
error(0, errno, "print_out_password");
1273
exitstatus = EX_IOERR;
937
1274
}
938
1275
}
939
1276
940
1277
/* Restore old signal handler */
941
1278
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
942
1279
if(ret == -1){
943
perror("sigaction");
944
exitstatus = EXIT_FAILURE;
1280
error(0, errno, "sigaction");
1281
exitstatus = EX_OSERR;
945
1282
}
946
1283
947
1284
if(custom_argv != NULL){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1285
for(char **arg = custom_argv+1; *arg != NULL; arg++){
949
1286
free(*arg);
950
1287
}
951
1288
free(custom_argv);
952
1289
}
953
free_plugin_list(plugin_list);
954
955
if(dir != NULL){
956
closedir(dir);
1290
1291
free(direntries);
1292
1293
if(dir_fd != -1){
1294
close(dir_fd);
957
1295
}
958
1296
959
/* Free the process list and kill the processes */
960
for(process *next; process_list != NULL; process_list = next){
961
next = process_list->next;
962
close(process_list->fd);
963
ret = kill(process_list->pid, SIGTERM);
964
if(ret == -1 and errno != ESRCH){
965
/* set-uid proccesses migth not get closed */
966
perror("kill");
1297
/* Kill the processes */
1298
for(plugin *p = plugin_list; p != NULL; p = p->next){
1299
if(p->pid != 0){
1300
close(p->fd);
1301
ret = kill(p->pid, SIGTERM);
1302
if(ret == -1 and errno != ESRCH){
1303
/* Set-uid proccesses might not get closed */
1304
error(0, errno, "kill");
1305
}
967
1306
}
968
free(process_list->buffer);
969
free(process_list);
970
1307
}
971
1308
972
1309
/* Wait for any remaining child processes to terminate */
973
do{
1310
do {
974
1311
ret = wait(NULL);
975
1312
} while(ret >= 0);
976
1313
if(errno != ECHILD){
977
perror("wait");
1314
error(0, errno, "wait");
978
1315
}
979
1316
1317
free_plugin_list();
1318
1319
free(plugindir);
1320
free(pluginhelperdir);
1321
free(argfile);
1322
980
1323
return exitstatus;
981
1324
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0