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- Committer: Teddy Hogeborn
- Date: 2016-03-13 00:37:02 UTC
- Revision ID: teddy@recompile.se-20160313003702-dulwtwt8ilpojra9
Server: Fix bug where it did not exit timely on signals
Use GLib.unix_signal_add() instead of signal.signal() to catch
signals; this will allow GLib to do its internal magic with signal
file descriptors. (GLib does not handle signals properly otherwise.)
The function unix_signal_add() requires GLib 2.30 or later, which was
not required by PyGobject until version 3.7.1, so depend on this.
* INSTALL (Mandos Server): Document dependency on PyGObject 3.7.1
* mandos (main): Use GLib.unix_signal_add instead of signal.signal.
* init.d-mandos (do_stop): Remove workaround.
* mandos.service ([Service]): - '' -
Use GLib.unix_signal_add() instead of signal.signal() to catch
signals; this will allow GLib to do its internal magic with signal
file descriptors. (GLib does not handle signals properly otherwise.)
The function unix_signal_add() requires GLib 2.30 or later, which was
not required by PyGobject until version 3.7.1, so depend on this.
* INSTALL (Mandos Server): Document dependency on PyGObject 3.7.1
* mandos (main): Use GLib.unix_signal_add instead of signal.signal.
* init.d-mandos (do_stop): Remove workaround.
* mandos.service ([Service]): - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- plugins.d/usplash
- 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
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#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() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
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,
58
60
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
60
63
#include <signal.h> /* struct sigaction, sigemptyset(),
61
64
sigaddset(), sigaction(),
62
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
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() */
65
75
66
76
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct 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>";
84
85
typedef struct plugin{
86
char *name; /* can be NULL or any plugin name */
87
char **argv;
88
int argc;
89
char **environ;
90
int envc;
91
bool disabled;
92
93
/* Variables used for running processes*/
75
94
pid_t pid;
76
95
int fd;
77
96
char *buffer;
78
97
size_t buffer_size;
79
98
size_t buffer_length;
80
99
bool eof;
81
bool completed;
100
volatile sig_atomic_t completed;
82
101
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
char **environ;
91
int envc;
92
bool disabled;
93
102
struct plugin *next;
94
103
} plugin;
95
104
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
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))){
100
115
return p;
101
116
}
102
117
}
103
118
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
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){
106
124
return NULL;
107
125
}
108
126
char *copy_name = NULL;
109
127
if(name != NULL){
110
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
111
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
112
135
return NULL;
113
136
}
114
137
}
115
138
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
121
143
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
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;
124
149
free(copy_name);
125
150
free(new_plugin);
151
errno = e;
126
152
return NULL;
127
153
}
128
154
new_plugin->argv[0] = copy_name;
129
155
new_plugin->argv[1] = NULL;
130
131
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);
132
160
if(new_plugin->environ == NULL){
161
int e = errno;
133
162
free(copy_name);
134
163
free(new_plugin->argv);
135
164
free(new_plugin);
165
errno = e;
136
166
return NULL;
137
167
}
138
168
new_plugin->environ[0] = NULL;
169
139
170
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
141
172
return new_plugin;
142
173
}
143
174
144
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
145
177
static bool add_to_char_array(const char *new, char ***array,
146
178
int *len){
147
179
/* Resize the pointed-to array to hold one more pointer */
148
*array = realloc(*array, sizeof(char *)
149
* (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);
150
185
/* Malloc check */
151
if(*array == NULL){
186
if(new_array == NULL){
152
187
return false;
153
188
}
189
*array = new_array;
154
190
/* Make a copy of the new string */
155
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
156
195
if(copy == NULL){
157
196
return false;
158
197
}
165
204
}
166
205
167
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
168
208
static bool add_argument(plugin *p, const char *arg){
169
209
if(p == NULL){
170
210
return false;
173
213
}
174
214
175
215
/* Add to a plugin's environment */
176
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){
177
218
if(p == NULL){
178
219
return false;
179
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
}
180
241
return add_to_char_array(def, &(p->environ), &(p->envc));
181
242
}
182
243
183
244
#ifndef O_CLOEXEC
184
245
/*
185
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
247
* Descriptor Flags".
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
249
*/
189
static int set_cloexec_flag(int fd)
190
{
191
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));
192
253
/* If reading the flags failed, return error indication now. */
193
254
if(ret < 0){
194
255
return ret;
195
256
}
196
257
/* Store modified flag word in the descriptor. */
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
198
260
}
199
200
process *process_list = NULL;
201
202
/* Mark processes as completed when it exits, and save its exit
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
203
265
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
206
268
while(true){
269
plugin *proc = plugin_list;
207
270
int status;
208
271
pid_t pid = waitpid(-1, &status, WNOHANG);
209
272
if(pid == 0){
273
/* Only still running child processes */
210
274
break;
211
275
}
212
276
if(pid == -1){
213
if (errno != ECHILD){
214
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
215
280
}
216
return;
281
error(0, errno, "waitpid");
217
282
}
218
283
284
/* A child exited, find it in process_list */
219
285
while(proc != NULL and proc->pid != pid){
220
286
proc = proc->next;
221
287
}
224
290
continue;
225
291
}
226
292
proc->status = status;
227
proc->completed = true;
293
proc->completed = 1;
228
294
}
295
errno = old_errno;
229
296
}
230
297
231
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){
232
301
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
236
302
for(size_t written = 0; written < length; written += (size_t)ret){
237
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
238
304
length - written));
243
309
return true;
244
310
}
245
311
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
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
}
252
337
}
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
338
}
339
340
free(plugin_node);
265
341
}
266
342
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
279
346
}
280
347
}
281
348
282
349
int main(int argc, char *argv[]){
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
285
353
FILE *conffp;
286
size_t d_name_len;
287
DIR *dir = NULL;
288
struct dirent *dirst;
354
struct dirent **direntries = NULL;
289
355
struct stat st;
290
356
fd_set rfds_all;
291
357
int ret, maxfd = 0;
358
ssize_t sret;
292
359
uid_t uid = 65534;
293
360
gid_t gid = 65534;
294
361
bool debug = false;
298
365
.sa_flags = SA_NOCLDSTOP };
299
366
char **custom_argv = NULL;
300
367
int custom_argc = 0;
368
int dir_fd = -1;
301
369
302
370
/* Establish a signal handler */
303
371
sigemptyset(&sigchld_action.sa_mask);
304
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
305
373
if(ret == -1){
306
perror("sigaddset");
307
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
308
376
goto fallback;
309
377
}
310
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
311
379
if(ret == -1){
312
perror("sigaction");
313
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
314
382
goto fallback;
315
383
}
316
384
319
387
{ .name = "global-options", .key = 'g',
320
388
.arg = "OPTION[,OPTION[,...]]",
321
389
.doc = "Options passed to all plugins" },
322
{ .name = "global-envs", .key = 'e',
390
{ .name = "global-env", .key = 'G',
323
391
.arg = "VAR=value",
324
392
.doc = "Environment variable passed to all plugins" },
325
393
{ .name = "options-for", .key = 'o',
326
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
327
395
.doc = "Options passed only to specified plugin" },
328
{ .name = "envs-for", .key = 'f',
396
{ .name = "env-for", .key = 'E',
329
397
.arg = "PLUGIN:ENV=value",
330
398
.doc = "Environment variable passed to specified plugin" },
331
399
{ .name = "disable", .key = 'd',
332
400
.arg = "PLUGIN",
333
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
334
405
{ .name = "plugin-dir", .key = 128,
335
406
.arg = "DIRECTORY",
336
407
.doc = "Specify a different plugin directory", .group = 2 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.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 },
345
432
{ .name = NULL }
346
433
};
347
434
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
358
continue;
359
}
360
if(not add_argument(getplugin(NULL, plugins), p)){
361
perror("add_argument");
362
return ARGP_ERR_UNKNOWN;
363
}
364
}
365
}
366
break;
367
case 'e':
368
if(arg == NULL){
369
break;
370
}
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
379
}
380
break;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
401
}
402
}
403
}
404
break;
405
case 'f':
406
if(arg == NULL){
407
break;
408
}
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 */
409
482
{
410
483
char *envdef = strchr(arg, ':');
411
484
if(envdef == NULL){
412
break;
413
}
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
418
490
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
420
perror("add_environment");
421
}
422
}
423
break;
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
427
if(p == NULL){
428
return ARGP_ERR_UNKNOWN;
429
}
430
p->disabled = true;
431
}
432
break;
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
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 */
443
552
debug = true;
444
553
break;
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.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
default:
587
return ARGP_ERR_UNKNOWN;
588
}
589
return errno; /* Set to 0 at start */
590
}
591
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
606
break;
607
case 129: /* --config-file */
608
free(argfile);
609
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
612
}
613
break;
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
case ARGP_KEY_ARG:
622
break;
623
default:
624
return ARGP_ERR_UNKNOWN;
625
}
626
return errno;
627
}
628
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
460
632
.doc = "Mandos plugin runner -- Run plugins" };
461
633
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
464
fprintf(stderr, "Unknown error while parsing arguments\n");
465
exitstatus = EXIT_FAILURE;
466
goto fallback;
467
}
468
469
conffp = fopen(argfile, "r");
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
650
goto fallback;
651
}
652
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
655
656
/* Open the configfile if available */
657
if(argfile == NULL){
658
conffp = fopen(AFILE, "r");
659
} else {
660
conffp = fopen(argfile, "r");
661
}
470
662
if(conffp != NULL){
471
663
char *org_line = NULL;
472
664
char *p, *arg, *new_arg, *line;
473
665
size_t size = 0;
474
ssize_t sret;
475
666
const char whitespace_delims[] = " \r\t\f\v\n";
476
667
const char comment_delim[] = "#";
477
668
669
custom_argc = 1;
670
custom_argv = malloc(sizeof(char*) * 2);
671
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
674
goto fallback;
675
}
676
custom_argv[0] = argv[0];
677
custom_argv[1] = NULL;
678
679
/* for each line in the config file, strip whitespace and ignore
680
commented text */
478
681
while(true){
479
682
sret = getline(&org_line, &size, conffp);
480
683
if(sret == -1){
481
684
break;
482
685
}
483
686
484
687
line = org_line;
485
688
arg = strsep(&line, comment_delim);
486
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
488
691
continue;
489
692
}
490
693
new_arg = strdup(p);
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
694
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
697
free(org_line);
495
698
goto fallback;
496
699
}
700
701
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
714
}
715
custom_argv[custom_argc-1] = new_arg;
716
custom_argv[custom_argc] = NULL;
497
717
}
498
718
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
499
727
free(org_line);
500
} else{
728
} else {
501
729
/* Check for harmful errors and go to fallback. Other errors might
502
730
not affect opening plugins */
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
504
perror("fopen");
505
exitstatus = EXIT_FAILURE;
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
506
734
goto fallback;
507
735
}
508
736
}
509
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
510
739
if(custom_argv != NULL){
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
514
fprintf(stderr, "Unknown error while parsing arguments\n");
515
exitstatus = EXIT_FAILURE;
516
goto fallback;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
754
goto fallback;
755
}
756
}
757
758
/* Parse actual command line arguments, to let them override the
759
config file */
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
517
792
}
518
793
}
519
794
524
799
for(char **a = p->argv; *a != NULL; a++){
525
800
fprintf(stderr, "\tArg: %s\n", *a);
526
801
}
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
528
803
for(char **a = p->environ; *a != NULL; a++){
529
804
fprintf(stderr, "\t%s\n", *a);
530
805
}
531
806
}
532
807
}
533
808
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
534
838
ret = setuid(uid);
535
if (ret == -1){
536
perror("setuid");
537
}
538
539
setgid(gid);
540
if (ret == -1){
541
perror("setgid");
542
}
543
544
dir = opendir(plugindir);
545
if(dir == NULL){
546
perror("Could not open plugin dir");
547
exitstatus = EXIT_FAILURE;
548
goto fallback;
549
}
550
551
/* Set the FD_CLOEXEC flag on the directory, if possible */
839
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
552
844
{
553
int dir_fd = dirfd(dir);
554
if(dir_fd >= 0){
555
ret = set_cloexec_flag(dir_fd);
556
if(ret < 0){
557
perror("set_cloexec_flag");
558
exitstatus = EXIT_FAILURE;
559
goto fallback;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
560
889
}
561
890
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
562
901
}
563
902
564
903
FD_ZERO(&rfds_all);
565
904
566
while(true){
567
dirst = readdir(dir);
568
569
// All directory entries have been processed
570
if(dirst == NULL){
571
if (errno == EBADF){
572
perror("readdir");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
break;
577
}
578
579
d_name_len = strlen(dirst->d_name);
580
581
// Ignore dotfiles, backup files and other junk
582
{
583
bool bad_name = false;
584
585
const char const *bad_prefixes[] = { ".", "#", NULL };
586
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
588
".dpkg-old",
589
".dpkg-divert", NULL };
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
591
size_t pre_len = strlen(*pre);
592
if((d_name_len >= pre_len)
593
and strncmp((dirst->d_name), *pre, pre_len) == 0){
594
if(debug){
595
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
596
" with bad prefix %s\n", dirst->d_name, *pre);
597
}
598
bad_name = true;
599
break;
600
}
601
}
602
603
if(bad_name){
604
continue;
605
}
606
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
608
size_t suf_len = strlen(*suf);
609
if((d_name_len >= suf_len)
610
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
611
== 0)){
612
if(debug){
613
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
614
" with bad suffix %s\n", dirst->d_name, *suf);
615
}
616
bad_name = true;
617
break;
618
}
619
}
620
621
if(bad_name){
622
continue;
623
}
624
}
625
626
char *filename;
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
628
if(ret < 0){
629
perror("asprintf");
630
continue;
631
}
632
633
ret = stat(filename, &st);
634
if (ret == -1){
635
perror("stat");
636
free(filename);
637
continue;
638
}
639
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
905
/* Read and execute any executable in the plugin directory*/
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
912
continue;
913
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
919
continue;
920
}
921
922
/* Ignore non-executable files */
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
641
926
if(debug){
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
643
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
644
931
}
645
free(filename);
932
close(plugin_fd);
933
free(direntries[i]);
646
934
continue;
647
935
}
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
936
937
plugin *p = getplugin(direntries[i]->d_name);
649
938
if(p == NULL){
650
perror("getplugin");
651
free(filename);
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
652
942
continue;
653
943
}
654
944
if(p->disabled){
655
945
if(debug){
656
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
657
dirst->d_name);
947
direntries[i]->d_name);
658
948
}
659
free(filename);
949
close(plugin_fd);
950
free(direntries[i]);
660
951
continue;
661
952
}
662
953
{
663
954
/* Add global arguments to argument list for this plugin */
664
plugin *g = getplugin(NULL, &plugin_list);
955
plugin *g = getplugin(NULL);
665
956
if(g != NULL){
666
957
for(char **a = g->argv + 1; *a != NULL; a++){
667
958
if(not add_argument(p, *a)){
668
perror("add_argument");
959
error(0, errno, "add_argument");
669
960
}
670
961
}
671
962
/* Add global environment variables */
672
963
for(char **e = g->environ; *e != NULL; e++){
673
if(not add_environment(p, *e)){
674
perror("add_environment");
964
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
675
966
}
676
967
}
677
968
}
678
969
}
679
/* If this plugin has any environment variables, we will call
680
using execve and need to duplicate the environment from this
681
process, too. */
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
682
972
if(p->environ[0] != NULL){
683
973
for(char **e = environ; *e != NULL; e++){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
690
perror("add_environment");
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
691
976
}
692
977
}
693
978
}
694
979
695
980
int pipefd[2];
696
ret = pipe(pipefd);
697
if (ret == -1){
698
perror("pipe");
699
exitstatus = EXIT_FAILURE;
700
goto fallback;
701
}
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
986
if(ret == -1){
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
1002
/* Ask OS to automatic close the pipe on exec */
702
1003
ret = set_cloexec_flag(pipefd[0]);
703
1004
if(ret < 0){
704
perror("set_cloexec_flag");
705
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
706
1010
goto fallback;
707
1011
}
708
1012
ret = set_cloexec_flag(pipefd[1]);
709
1013
if(ret < 0){
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
712
1019
goto fallback;
713
1020
}
1021
#endif /* not O_CLOEXEC */
714
1022
/* Block SIGCHLD until process is safely in process list */
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
716
1026
if(ret < 0){
717
perror("sigprocmask");
718
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
719
1030
goto fallback;
720
1031
}
721
// Starting a new process to be watched
722
pid_t pid = fork();
1032
/* Starting a new process to be watched */
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
723
1037
if(pid == -1){
724
perror("fork");
725
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
726
1045
goto fallback;
727
1046
}
728
1047
if(pid == 0){
729
1048
/* this is the child process */
730
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
731
1050
if(ret < 0){
732
perror("sigaction");
733
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
734
1053
}
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
736
1055
if(ret < 0){
737
perror("sigprocmask");
738
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
739
1058
}
740
1059
741
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
742
1061
if(ret == -1){
743
perror("dup2");
744
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
745
1064
}
746
1065
747
if(dirfd(dir) < 0){
748
/* If dir has no file descriptor, we could not set FD_CLOEXEC
749
above and must now close it manually here. */
750
closedir(dir);
751
}
752
if(p->environ[0] == NULL){
753
if(execv(filename, p->argv) < 0){
754
perror("execv");
755
_exit(EXIT_FAILURE);
756
}
757
} else {
758
if(execve(filename, p->argv, p->environ) < 0){
759
perror("execve");
760
_exit(EXIT_FAILURE);
761
}
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
762
1072
}
763
1073
/* no return */
764
1074
}
765
/* parent process */
766
free(filename);
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1075
/* Parent process */
1076
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
772
1084
if(ret < 0){
773
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
774
1086
}
775
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
776
1089
goto fallback;
777
1090
}
778
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
1091
free(direntries[i]);
1092
1093
new_plugin->pid = pid;
1094
new_plugin->fd = pipefd[0];
1095
784
1096
/* Unblock SIGCHLD so signal handler can be run if this process
785
1097
has already completed */
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
787
1101
if(ret < 0){
788
perror("sigprocmask");
789
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
790
1104
goto fallback;
791
1105
}
792
1106
793
FD_SET(new_process->fd, &rfds_all);
794
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
797
}
798
799
}
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
closedir(dir);
805
dir = NULL;
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
811
}
812
while(process_list){
1107
FD_SET(new_plugin->fd, &rfds_all);
1108
1109
if(maxfd < new_plugin->fd){
1110
maxfd = new_plugin->fd;
1111
}
1112
}
1113
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
1119
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
1121
if(p->pid != 0){
1122
break;
1123
}
1124
if(p->next == NULL){
1125
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1126
" directory?\n");
1127
free_plugin_list();
1128
}
1129
}
1130
1131
/* Main loop while running plugins exist */
1132
while(plugin_list){
813
1133
fd_set rfds = rfds_all;
814
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
815
if (select_ret == -1){
816
perror("select");
817
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
818
1138
goto fallback;
819
1139
}
820
1140
/* OK, now either a process completed, or something can be read
821
1141
from one of them */
822
for(process *proc = process_list; proc ; proc = proc->next){
1142
for(plugin *proc = plugin_list; proc != NULL;){
823
1143
/* Is this process completely done? */
824
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
825
1145
/* Only accept the plugin output if it exited cleanly */
826
1146
if(not WIFEXITED(proc->status)
827
1147
or WEXITSTATUS(proc->status) != 0){
828
1148
/* Bad exit by plugin */
1149
829
1150
if(debug){
830
1151
if(WIFEXITED(proc->status)){
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
833
1155
WEXITSTATUS(proc->status));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
837
WTERMSIG(proc->status));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
838
1162
} else if(WCOREDUMP(proc->status)){
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1164
" core\n", proc->name, (intmax_t) (proc->pid));
841
1165
}
842
1166
}
1167
843
1168
/* Remove the plugin */
844
1169
FD_CLR(proc->fd, &rfds_all);
1170
845
1171
/* Block signal while modifying process_list */
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
(SIG_BLOCK,
1174
&sigchld_action.sa_mask,
1175
NULL));
847
1176
if(ret < 0){
848
perror("sigprocmask");
849
exitstatus = EXIT_FAILURE;
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
850
1179
goto fallback;
851
1180
}
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
1181
1182
plugin *next_plugin = proc->next;
1183
free_plugin(proc);
1184
proc = next_plugin;
1185
865
1186
/* We are done modifying process list, so unblock signal */
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1187
ret = (int)(TEMP_FAILURE_RETRY
1188
(sigprocmask(SIG_UNBLOCK,
1189
&sigchld_action.sa_mask, NULL)));
868
1190
if(ret < 0){
869
perror("sigprocmask");
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
1193
goto fallback;
1194
}
1195
1196
if(plugin_list == NULL){
1197
break;
1198
}
1199
1200
continue;
877
1201
}
1202
878
1203
/* This process exited nicely, so print its buffer */
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1204
1205
bool bret = print_out_password(proc->buffer,
1206
proc->buffer_length);
881
1207
if(not bret){
882
perror("print_out_password");
883
exitstatus = EXIT_FAILURE;
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
884
1210
}
885
1211
goto fallback;
886
1212
}
1213
887
1214
/* This process has not completed. Does it have any output? */
888
1215
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
889
1216
/* This process had nothing to say at this time */
1217
proc = proc->next;
890
1218
continue;
891
1219
}
892
1220
/* Before reading, make the process' data buffer large enough */
893
1221
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
895
+ (size_t) BUFFER_SIZE);
896
if (proc->buffer == NULL){
897
perror("malloc");
898
exitstatus = EXIT_FAILURE;
1222
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1223
+ (size_t) BUFFER_SIZE);
1224
if(new_buffer == NULL){
1225
error(0, errno, "malloc");
1226
exitstatus = EX_OSERR;
899
1227
goto fallback;
900
1228
}
1229
proc->buffer = new_buffer;
901
1230
proc->buffer_size += BUFFER_SIZE;
902
1231
}
903
1232
/* Read from the process */
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1233
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1234
proc->buffer
1235
+ proc->buffer_length,
1236
BUFFER_SIZE));
1237
if(sret < 0){
907
1238
/* Read error from this process; ignore the error */
1239
proc = proc->next;
908
1240
continue;
909
1241
}
910
if(ret == 0){
1242
if(sret == 0){
911
1243
/* got EOF */
912
1244
proc->eof = true;
913
1245
} else {
914
proc->buffer_length += (size_t) ret;
1246
proc->buffer_length += (size_t) sret;
915
1247
}
916
1248
}
917
1249
}
918
919
1250
1251
920
1252
fallback:
921
1253
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
1256
/* Fallback if all plugins failed, none are found or an error
1257
occured */
924
1258
bool bret;
925
1259
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1260
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1261
size_t len = strlen(passwordbuffer);
1262
/* Strip trailing newline */
1263
if(len > 0 and passwordbuffer[len-1] == '\n'){
1264
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1265
len--;
1266
}
1267
bret = print_out_password(passwordbuffer, len);
928
1268
if(not bret){
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
931
1271
}
932
1272
}
933
1273
934
1274
/* Restore old signal handler */
935
1275
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
936
1276
if(ret == -1){
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
939
1279
}
940
1280
941
1281
if(custom_argv != NULL){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1282
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1283
free(*arg);
944
1284
}
945
1285
free(custom_argv);
946
1286
}
947
free_plugin_list(plugin_list);
948
949
if(dir != NULL){
950
closedir(dir);
1287
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
951
1292
}
952
1293
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1294
/* Kill the processes */
1295
for(plugin *p = plugin_list; p != NULL; p = p->next){
1296
if(p->pid != 0){
1297
close(p->fd);
1298
ret = kill(p->pid, SIGTERM);
1299
if(ret == -1 and errno != ESRCH){
1300
/* Set-uid proccesses might not get closed */
1301
error(0, errno, "kill");
1302
}
961
1303
}
962
free(process_list->buffer);
963
free(process_list);
964
1304
}
965
1305
966
1306
/* Wait for any remaining child processes to terminate */
967
do{
1307
do {
968
1308
ret = wait(NULL);
969
1309
} while(ret >= 0);
970
1310
if(errno != ECHILD){
971
perror("wait");
1311
error(0, errno, "wait");
972
1312
}
973
1313
1314
free_plugin_list();
1315
1316
free(plugindir);
1317
free(pluginhelperdir);
1318
free(argfile);
1319
974
1320
return exitstatus;
975
1321
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0