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- Committer: Teddy Hogeborn
- Date: 2018-08-19 14:58:40 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 368.
- Revision ID: teddy@recompile.se-20180819145840-s1a3xar41lyoq4ty
Set executable permissions on new files
* initramfs-tools-script-stop: Did "chmod +x".
* mandos-to-cryptroot-unlock: - '' -
* initramfs-tools-script-stop: Did "chmod +x".
* mandos-to-cryptroot-unlock: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- 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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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> /* strtok, strlen(), strcpy(),
55
strcat() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
59
60
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
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
77
69
const char *argp_program_version = "mandos-client 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
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
bool disabled;
91
102
struct plugin *next;
92
103
} plugin;
93
104
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
98
115
return p;
99
116
}
100
117
}
101
118
/* Create a new plugin */
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
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){
124
return NULL;
125
}
126
char *copy_name = NULL;
127
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
return NULL;
136
}
137
}
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
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;
149
free(copy_name);
150
free(new_plugin);
151
errno = e;
152
return NULL;
153
}
154
new_plugin->argv[0] = copy_name;
114
155
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
160
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
163
free(new_plugin->argv);
164
free(new_plugin);
165
errno = e;
166
return NULL;
167
}
168
new_plugin->environ[0] = NULL;
169
118
170
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
120
172
return new_plugin;
121
173
}
122
174
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
132
}
133
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
static bool add_to_char_array(const char *new, char ***array,
178
int *len){
179
/* Resize the pointed-to array to hold one more pointer */
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);
185
/* Malloc check */
186
if(new_array == NULL){
187
return false;
188
}
189
*array = new_array;
190
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
195
if(copy == NULL){
196
return false;
197
}
198
/* Insert the copy */
199
(*array)[*len] = copy;
200
(*len)++;
201
/* Add a new terminating NULL pointer to the last element */
202
(*array)[*len] = NULL;
203
return true;
204
}
205
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
static bool add_argument(plugin *p, const char *arg){
209
if(p == NULL){
210
return false;
211
}
212
return add_to_char_array(arg, &(p->argv), &(p->argc));
213
}
214
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
218
if(p == NULL){
219
return false;
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
}
241
return add_to_char_array(def, &(p->environ), &(p->envc));
242
}
243
244
#ifndef O_CLOEXEC
134
245
/*
135
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
136
247
* Descriptor Flags".
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
138
249
*/
139
static int set_cloexec_flag(int fd)
140
{
141
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));
142
253
/* If reading the flags failed, return error indication now. */
143
254
if(ret < 0){
144
255
return ret;
145
256
}
146
257
/* Store modified flag word in the descriptor. */
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
148
260
}
149
150
process *process_list = NULL;
151
152
/* Mark a process 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
153
265
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
while(true){
269
plugin *proc = plugin_list;
270
int status;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
272
if(pid == 0){
273
/* Only still running child processes */
274
break;
275
}
276
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
280
}
281
error(0, errno, "waitpid");
282
}
283
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
286
proc = proc->next;
287
}
288
if(proc == NULL){
289
/* Process not found in process list */
290
continue;
291
}
292
proc->status = status;
293
proc->completed = 1;
294
}
295
errno = old_errno;
171
296
}
172
297
173
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){
174
301
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
302
for(size_t written = 0; written < length; written += (size_t)ret){
179
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
304
length - written));
185
309
return true;
186
310
}
187
311
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
}
337
}
338
}
339
340
free(plugin_node);
341
}
342
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
346
}
347
}
348
188
349
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
190
size_t d_name_len;
191
DIR *dir = NULL;
192
struct dirent *dirst;
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
353
FILE *conffp;
354
struct dirent **direntries = NULL;
193
355
struct stat st;
194
356
fd_set rfds_all;
195
357
int ret, maxfd = 0;
358
ssize_t sret;
196
359
uid_t uid = 65534;
197
360
gid_t gid = 65534;
198
361
bool debug = false;
200
363
struct sigaction old_sigchld_action;
201
364
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
365
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
366
char **custom_argv = NULL;
367
int custom_argc = 0;
368
int dir_fd = -1;
205
369
206
370
/* Establish a signal handler */
207
371
sigemptyset(&sigchld_action.sa_mask);
208
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
210
perror("sigaddset");
211
exit(EXIT_FAILURE);
373
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
376
goto fallback;
212
377
}
213
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
215
perror("sigaction");
216
exit(EXIT_FAILURE);
379
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
382
goto fallback;
217
383
}
218
384
219
385
/* The options we understand. */
221
387
{ .name = "global-options", .key = 'g',
222
388
.arg = "OPTION[,OPTION[,...]]",
223
389
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
391
.arg = "VAR=value",
392
.doc = "Environment variable passed to all plugins" },
224
393
{ .name = "options-for", .key = 'o',
225
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
395
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
397
.arg = "PLUGIN:ENV=value",
398
.doc = "Environment variable passed to specified plugin" },
227
399
{ .name = "disable", .key = 'd',
228
400
.arg = "PLUGIN",
229
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
230
405
{ .name = "plugin-dir", .key = 128,
231
406
.arg = "DIRECTORY",
232
407
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.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 },
241
432
{ .name = NULL }
242
433
};
243
434
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
280
uid = (uid_t)strtol(arg, NULL, 10);
281
break;
282
case 130:
283
gid = (gid_t)strtol(arg, NULL, 10);
284
break;
285
case 131:
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 */
482
{
483
char *envdef = strchr(arg, ':');
484
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
490
envdef++;
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 */
286
552
debug = true;
287
553
break;
288
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.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 = "",
306
633
.doc = "Mandos plugin runner -- Run plugins" };
307
634
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
310
fprintf(stderr, "Unknown error while parsing arguments\n");
311
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
325
perror("malloc");
326
exitstatus = EXIT_FAILURE;
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
if (ret == ARGP_ERR_UNKNOWN){
347
fprintf(stderr, "Unknown error while parsing arguments\n");
348
exitstatus = EXIT_FAILURE;
349
goto end;
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
}
663
if(conffp != NULL){
664
char *org_line = NULL;
665
char *p, *arg, *new_arg, *line;
666
size_t size = 0;
667
const char whitespace_delims[] = " \r\t\f\v\n";
668
const char comment_delim[] = "#";
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 */
682
while(true){
683
sret = getline(&org_line, &size, conffp);
684
if(sret == -1){
685
break;
686
}
687
688
line = org_line;
689
arg = strsep(&line, comment_delim);
690
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
if(p[0] == '\0'){
692
continue;
693
}
694
new_arg = strdup(p);
695
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
698
free(org_line);
699
goto fallback;
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;
718
}
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
}
728
free(org_line);
729
} else {
730
/* Check for harmful errors and go to fallback. Other errors might
731
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
735
goto fallback;
736
}
737
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
740
if(custom_argv != NULL){
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);
350
793
}
351
794
}
352
795
353
796
if(debug){
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
355
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
356
799
p->name ? p->name : "Global", p->argc - 1);
357
800
for(char **a = p->argv; *a != NULL; a++){
358
801
fprintf(stderr, "\tArg: %s\n", *a);
359
802
}
360
}
361
}
362
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
804
for(char **a = p->environ; *a != NULL; a++){
805
fprintf(stderr, "\t%s\n", *a);
806
}
807
}
808
}
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
}
363
839
ret = setuid(uid);
364
if (ret == -1){
365
perror("setuid");
366
}
367
368
setgid(gid);
369
if (ret == -1){
370
perror("setgid");
371
}
372
373
dir = opendir(plugindir);
374
if(dir == NULL){
375
perror("Could not open plugin dir");
376
exitstatus = EXIT_FAILURE;
377
goto end;
378
}
379
380
/* 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 */
381
845
{
382
int dir_fd = dirfd(dir);
383
if(dir_fd >= 0){
384
ret = set_cloexec_flag(dir_fd);
385
if(ret < 0){
386
perror("set_cloexec_flag");
387
exitstatus = EXIT_FAILURE;
388
goto end;
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;
389
890
}
390
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;
391
902
}
392
903
393
904
FD_ZERO(&rfds_all);
394
905
395
while(true){
396
dirst = readdir(dir);
397
398
// All directory entries have been processed
399
if(dirst == NULL){
400
if (errno == EBADF){
401
perror("readdir");
402
exitstatus = EXIT_FAILURE;
403
goto end;
404
}
405
break;
406
}
407
408
d_name_len = strlen(dirst->d_name);
409
410
// Ignore dotfiles, backup files and other junk
411
{
412
bool bad_name = false;
413
414
const char const *bad_prefixes[] = { ".", "#", NULL };
415
416
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
".dpkg-old",
418
".dpkg-divert", NULL };
419
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
size_t pre_len = strlen(*pre);
421
if((d_name_len >= pre_len)
422
and strncmp((dirst->d_name), *pre, pre_len) == 0){
423
if(debug){
424
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
425
" with bad prefix %s\n", dirst->d_name, *pre);
426
}
427
bad_name = true;
428
break;
429
}
430
}
431
432
if(bad_name){
433
continue;
434
}
435
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
size_t suf_len = strlen(*suf);
438
if((d_name_len >= suf_len)
439
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
440
== 0)){
441
if(debug){
442
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
443
" with bad suffix %s\n", dirst->d_name, *suf);
444
}
445
bad_name = true;
446
break;
447
}
448
}
449
450
if(bad_name){
451
continue;
452
}
453
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
464
465
ret = stat(filename, &st);
466
if (ret == -1){
467
perror("stat");
468
exitstatus = EXIT_FAILURE;
469
goto end;
470
}
471
472
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)){
473
927
if(debug){
474
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
475
" 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);
476
932
}
477
free(filename);
478
continue;
479
}
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
933
close(plugin_fd);
934
free(direntries[i]);
935
continue;
936
}
937
938
plugin *p = getplugin(direntries[i]->d_name);
939
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
943
continue;
944
}
945
if(p->disabled){
481
946
if(debug){
482
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
483
dirst->d_name);
948
direntries[i]->d_name);
484
949
}
485
free(filename);
950
close(plugin_fd);
951
free(direntries[i]);
486
952
continue;
487
953
}
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
489
954
{
490
955
/* Add global arguments to argument list for this plugin */
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
493
addargument(p, *a);
494
}
495
}
496
int pipefd[2];
497
ret = pipe(pipefd);
498
if (ret == -1){
499
perror("pipe");
500
exitstatus = EXIT_FAILURE;
501
goto end;
502
}
956
plugin *g = getplugin(NULL);
957
if(g != NULL){
958
for(char **a = g->argv + 1; *a != NULL; a++){
959
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
961
}
962
}
963
/* Add global environment variables */
964
for(char **e = g->environ; *e != NULL; e++){
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
967
}
968
}
969
}
970
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
973
if(p->environ[0] != NULL){
974
for(char **e = environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
977
}
978
}
979
}
980
981
int pipefd[2];
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 */
503
1004
ret = set_cloexec_flag(pipefd[0]);
504
1005
if(ret < 0){
505
perror("set_cloexec_flag");
506
exitstatus = EXIT_FAILURE;
507
goto end;
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
1011
goto fallback;
508
1012
}
509
1013
ret = set_cloexec_flag(pipefd[1]);
510
1014
if(ret < 0){
511
perror("set_cloexec_flag");
512
exitstatus = EXIT_FAILURE;
513
goto end;
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
514
1021
}
1022
#endif /* not O_CLOEXEC */
515
1023
/* Block SIGCHLD until process is safely in process list */
516
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));
517
1027
if(ret < 0){
518
perror("sigprocmask");
519
exitstatus = EXIT_FAILURE;
520
goto end;
521
}
522
// Starting a new process to be watched
523
pid_t pid = fork();
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
1031
goto fallback;
1032
}
1033
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
1038
if(pid == -1){
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]);
1046
goto fallback;
1047
}
524
1048
if(pid == 0){
525
1049
/* this is the child process */
526
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
527
1051
if(ret < 0){
528
perror("sigaction");
529
_exit(EXIT_FAILURE);
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
530
1054
}
531
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
532
1056
if(ret < 0){
533
perror("sigprocmask");
534
_exit(EXIT_FAILURE);
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
535
1059
}
536
1060
537
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
538
1062
if(ret == -1){
539
perror("dup2");
540
_exit(EXIT_FAILURE);
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
541
1065
}
542
1066
543
if(dirfd(dir) < 0){
544
/* If dir has no file descriptor, we could not set FD_CLOEXEC
545
above and must now close it manually here. */
546
closedir(dir);
547
}
548
if(execv(filename, p->argv) < 0){
549
perror("execv");
550
_exit(EXIT_FAILURE);
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);
551
1073
}
552
1074
/* no return */
553
1075
}
554
/* parent process */
555
free(filename);
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
559
perror("malloc");
560
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)));
561
1085
if(ret < 0){
562
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
563
1087
}
564
exitstatus = EXIT_FAILURE;
565
goto end;
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
1090
goto fallback;
566
1091
}
1092
free(direntries[i]);
567
1093
568
*new_process = (struct process){ .pid = pid,
569
.fd = pipefd[0],
570
.next = process_list };
571
// List handling
572
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
573
1102
/* Unblock SIGCHLD so signal handler can be run if this process
574
1103
has already completed */
575
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));
576
1107
if(ret < 0){
577
perror("sigprocmask");
578
exitstatus = EXIT_FAILURE;
579
goto end;
580
}
581
582
FD_SET(new_process->fd, &rfds_all);
583
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
586
}
587
588
}
589
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
594
free(plugin_list);
595
}
596
597
closedir(dir);
598
dir = NULL;
599
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
602
" directory?\n");
603
process_list = NULL;
604
}
605
while(process_list){
1108
error(0, errno, "sigprocmask");
1109
exitstatus = EX_OSERR;
1110
goto fallback;
1111
}
1112
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){
606
1139
fd_set rfds = rfds_all;
607
1140
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
608
if (select_ret == -1){
609
perror("select");
610
exitstatus = EXIT_FAILURE;
611
goto end;
1141
if(select_ret == -1 and errno != EINTR){
1142
error(0, errno, "select");
1143
exitstatus = EX_OSERR;
1144
goto fallback;
612
1145
}
613
1146
/* OK, now either a process completed, or something can be read
614
1147
from one of them */
615
for(process *proc = process_list; proc ; proc = proc->next){
1148
for(plugin *proc = plugin_list; proc != NULL;){
616
1149
/* Is this process completely done? */
617
if(proc->eof and proc->completed){
1150
if(proc->completed and proc->eof){
618
1151
/* Only accept the plugin output if it exited cleanly */
619
1152
if(not WIFEXITED(proc->status)
620
1153
or WEXITSTATUS(proc->status) != 0){
621
1154
/* Bad exit by plugin */
1155
622
1156
if(debug){
623
1157
if(WIFEXITED(proc->status)){
624
fprintf(stderr, "Plugin %u exited with status %d\n",
625
(unsigned int) (proc->pid),
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1159
" status %d\n", proc->name,
1160
(intmax_t) (proc->pid),
626
1161
WEXITSTATUS(proc->status));
627
} else if(WIFSIGNALED(proc->status)) {
628
fprintf(stderr, "Plugin %u killed by signal %d\n",
629
(unsigned int) (proc->pid),
630
WTERMSIG(proc->status));
631
} else if(WCOREDUMP(proc->status)){
632
fprintf(stderr, "Plugin %d dumped core\n",
633
(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)));
634
1168
}
635
1169
}
1170
636
1171
/* Remove the plugin */
637
1172
FD_CLR(proc->fd, &rfds_all);
1173
638
1174
/* Block signal while modifying process_list */
639
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));
640
1179
if(ret < 0){
641
perror("sigprocmask");
642
exitstatus = EXIT_FAILURE;
643
goto end;
644
}
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
649
} else {
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
652
if(p->next == proc){
653
p->next = proc->next;
654
break;
655
}
656
}
657
}
1180
error(0, errno, "sigprocmask");
1181
exitstatus = EX_OSERR;
1182
goto fallback;
1183
}
1184
1185
plugin *next_plugin = proc->next;
1186
free_plugin(proc);
1187
proc = next_plugin;
1188
658
1189
/* We are done modifying process list, so unblock signal */
659
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
660
NULL);
1190
ret = (int)(TEMP_FAILURE_RETRY
1191
(sigprocmask(SIG_UNBLOCK,
1192
&sigchld_action.sa_mask, NULL)));
661
1193
if(ret < 0){
662
perror("sigprocmask");
663
}
664
free(proc->buffer);
665
free(proc);
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
668
the process list */
669
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;
670
1204
}
1205
671
1206
/* This process exited nicely, so print its buffer */
672
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1207
1208
bool bret = print_out_password(proc->buffer,
1209
proc->buffer_length);
674
1210
if(not bret){
675
perror("print_out_password");
676
exitstatus = EXIT_FAILURE;
1211
error(0, errno, "print_out_password");
1212
exitstatus = EX_IOERR;
677
1213
}
678
goto end;
1214
goto fallback;
679
1215
}
1216
680
1217
/* This process has not completed. Does it have any output? */
681
1218
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
682
1219
/* This process had nothing to say at this time */
1220
proc = proc->next;
683
1221
continue;
684
1222
}
685
1223
/* Before reading, make the process' data buffer large enough */
686
1224
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
687
proc->buffer = realloc(proc->buffer, proc->buffer_size
688
+ (size_t) BUFFER_SIZE);
689
if (proc->buffer == NULL){
690
perror("malloc");
691
exitstatus = EXIT_FAILURE;
692
goto end;
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;
1230
goto fallback;
693
1231
}
1232
proc->buffer = new_buffer;
694
1233
proc->buffer_size += BUFFER_SIZE;
695
1234
}
696
1235
/* Read from the process */
697
ret = read(proc->fd, proc->buffer + proc->buffer_length,
698
BUFFER_SIZE);
699
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){
700
1241
/* Read error from this process; ignore the error */
1242
proc = proc->next;
701
1243
continue;
702
1244
}
703
if(ret == 0){
1245
if(sret == 0){
704
1246
/* got EOF */
705
1247
proc->eof = true;
706
1248
} else {
707
proc->buffer_length += (size_t) ret;
1249
proc->buffer_length += (size_t) sret;
708
1250
}
709
1251
}
710
1252
}
711
1253
712
if(process_list == NULL){
1254
1255
fallback:
1256
1257
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1258
and exitstatus != EX_OK)){
1259
/* Fallback if all plugins failed, none are found or an error
1260
occured */
713
1261
bool bret;
714
1262
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
715
1263
char *passwordbuffer = getpass("Password: ");
716
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);
717
1271
if(not bret){
718
perror("print_out_password");
719
exitstatus = EXIT_FAILURE;
720
goto end;
1272
error(0, errno, "print_out_password");
1273
exitstatus = EX_IOERR;
721
1274
}
722
1275
}
723
724
end:
725
1276
726
1277
/* Restore old signal handler */
727
sigaction(SIGCHLD, &old_sigchld_action, NULL);
728
729
free(plus_argv);
730
731
/* Free the plugin list */
732
for(plugin *next; plugin_list != NULL; plugin_list = next){
733
next = plugin_list->next;
734
free(plugin_list->argv);
735
free(plugin_list);
736
}
737
738
if(dir != NULL){
739
closedir(dir);
740
}
741
742
/* Free the process list and kill the processes */
743
for(process *next; process_list != NULL; process_list = next){
744
next = process_list->next;
745
close(process_list->fd);
746
ret = kill(process_list->pid, SIGTERM);
747
if(ret == -1 and errno != ESRCH){
748
/* set-uid proccesses migth not get closed */
749
perror("kill");
750
}
751
free(process_list->buffer);
752
free(process_list);
1278
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1279
if(ret == -1){
1280
error(0, errno, "sigaction");
1281
exitstatus = EX_OSERR;
1282
}
1283
1284
if(custom_argv != NULL){
1285
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1286
free(*arg);
1287
}
1288
free(custom_argv);
1289
}
1290
1291
free(direntries);
1292
1293
if(dir_fd != -1){
1294
close(dir_fd);
1295
}
1296
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
}
1306
}
753
1307
}
754
1308
755
1309
/* Wait for any remaining child processes to terminate */
756
do{
1310
do {
757
1311
ret = wait(NULL);
758
1312
} while(ret >= 0);
759
1313
if(errno != ECHILD){
760
perror("wait");
1314
error(0, errno, "wait");
761
1315
}
762
1316
1317
free_plugin_list();
1318
1319
free(plugindir);
1320
free(pluginhelperdir);
1321
free(argfile);
1322
763
1323
return exitstatus;
764
1324
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0