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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:40:11 UTC
- mfrom: (102 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080824234011-vb6j0ekivqripwhk
Merge.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
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() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
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(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
66
76
67
#define BUFFER_SIZE 256
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
83
86
84
87
typedef struct plugin{
85
88
char *name; /* can be NULL or any plugin name */
88
91
char **environ;
89
92
int envc;
90
93
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
114
101
return p;
115
102
}
116
103
}
117
104
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
123
107
return NULL;
124
108
}
125
109
char *copy_name = NULL;
126
110
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
130
112
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
113
return NULL;
135
114
}
136
115
}
137
116
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
142
122
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
148
125
free(copy_name);
149
126
free(new_plugin);
150
errno = e;
151
127
return NULL;
152
128
}
153
129
new_plugin->argv[0] = copy_name;
154
130
new_plugin->argv[1] = NULL;
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
159
133
if(new_plugin->environ == NULL){
160
int e = errno;
161
134
free(copy_name);
162
135
free(new_plugin->argv);
163
136
free(new_plugin);
164
errno = e;
165
137
return NULL;
166
138
}
167
139
new_plugin->environ[0] = NULL;
168
169
140
/* Append the new plugin to the list */
170
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
171
142
return new_plugin;
172
143
}
173
144
174
145
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
146
static bool add_to_char_array(const char *new, char ***array,
177
147
int *len){
178
148
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
184
151
/* Malloc check */
185
if(new_array == NULL){
152
if(*array == NULL){
186
153
return false;
187
154
}
188
*array = new_array;
189
155
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
194
157
if(copy == NULL){
195
158
return false;
196
159
}
203
166
}
204
167
205
168
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
169
static bool add_argument(plugin *p, const char *arg){
208
170
if(p == NULL){
209
171
return false;
212
174
}
213
175
214
176
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
217
178
if(p == NULL){
218
179
return false;
219
180
}
220
/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
226
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
232
return false;
233
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
236
}
237
return true;
238
}
239
}
240
181
return add_to_char_array(def, &(p->environ), &(p->envc));
241
182
}
242
183
243
#ifndef O_CLOEXEC
184
244
185
/*
245
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
187
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
189
*/
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
252
193
/* If reading the flags failed, return error indication now. */
253
194
if(ret < 0){
254
195
return ret;
255
196
}
256
197
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
199
}
260
#endif /* not O_CLOEXEC */
261
200
201
process *process_list = NULL;
262
202
263
203
/* Mark processes as completed when they exit, and save their exit
264
204
status. */
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
267
206
while(true){
268
plugin *proc = plugin_list;
207
process *proc = process_list;
269
208
int status;
270
209
pid_t pid = waitpid(-1, &status, WNOHANG);
271
210
if(pid == 0){
273
212
break;
274
213
}
275
214
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
215
if (errno != ECHILD){
216
perror("waitpid");
279
217
}
280
error(0, errno, "waitpid");
218
/* No child processes */
219
break;
281
220
}
282
221
283
222
/* A child exited, find it in process_list */
284
223
while(proc != NULL and proc->pid != pid){
285
224
proc = proc->next;
289
228
continue;
290
229
}
291
230
proc->status = status;
292
proc->completed = 1;
231
proc->completed = true;
293
232
}
294
errno = old_errno;
295
233
}
296
234
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
300
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
301
240
for(size_t written = 0; written < length; written += (size_t)ret){
302
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
303
242
length - written));
308
247
return true;
309
248
}
310
249
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
static void free_plugin(plugin *plugin_node){
314
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
free(*arg);
317
}
318
free(plugin_node->argv);
319
for(char **env = plugin_node->environ; *env != NULL; env++){
320
free(*env);
321
}
322
free(plugin_node->environ);
323
free(plugin_node->buffer);
324
325
/* Removes the plugin from the singly-linked list */
326
if(plugin_node == plugin_list){
327
/* First one - simple */
328
plugin_list = plugin_list->next;
329
} else {
330
/* Second one or later */
331
for(plugin *p = plugin_list; p != NULL; p = p->next){
332
if(p->next == plugin_node){
333
p->next = plugin_node->next;
334
break;
335
}
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
336
256
}
337
}
338
339
free(plugin_node);
257
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
258
argv[1] = NULL;
259
}
260
*argc += 1;
261
argv = realloc(argv, sizeof(char *)
262
* ((unsigned int) *argc + 1));
263
if(argv == NULL){
264
return NULL;
265
}
266
argv[*argc-1] = arg;
267
argv[*argc] = NULL;
268
return argv;
340
269
}
341
270
342
static void free_plugin_list(void){
343
while(plugin_list != NULL){
344
free_plugin(plugin_list);
271
static void free_plugin_list(plugin *plugin_list){
272
for(plugin *next; plugin_list != NULL; plugin_list = next){
273
next = plugin_list->next;
274
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_list->argv);
278
for(char **env = plugin_list->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_list->environ);
282
free(plugin_list);
345
283
}
346
284
}
347
285
348
286
int main(int argc, char *argv[]){
349
char *plugindir = NULL;
350
char *argfile = NULL;
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
351
289
FILE *conffp;
352
struct dirent **direntries = NULL;
290
size_t d_name_len;
291
DIR *dir = NULL;
292
struct dirent *dirst;
353
293
struct stat st;
354
294
fd_set rfds_all;
355
295
int ret, maxfd = 0;
356
ssize_t sret;
357
296
uid_t uid = 65534;
358
297
gid_t gid = 65534;
359
298
bool debug = false;
363
302
.sa_flags = SA_NOCLDSTOP };
364
303
char **custom_argv = NULL;
365
304
int custom_argc = 0;
366
int dir_fd = -1;
367
305
368
306
/* Establish a signal handler */
369
307
sigemptyset(&sigchld_action.sa_mask);
370
308
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
309
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
310
perror("sigaddset");
311
exitstatus = EXIT_FAILURE;
374
312
goto fallback;
375
313
}
376
314
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
315
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
316
perror("sigaction");
317
exitstatus = EXIT_FAILURE;
380
318
goto fallback;
381
319
}
382
320
385
323
{ .name = "global-options", .key = 'g',
386
324
.arg = "OPTION[,OPTION[,...]]",
387
325
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
326
{ .name = "global-envs", .key = 'e',
389
327
.arg = "VAR=value",
390
328
.doc = "Environment variable passed to all plugins" },
391
329
{ .name = "options-for", .key = 'o',
392
330
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
393
331
.doc = "Options passed only to specified plugin" },
394
{ .name = "env-for", .key = 'E',
332
{ .name = "envs-for", .key = 'f',
395
333
.arg = "PLUGIN:ENV=value",
396
334
.doc = "Environment variable passed to specified plugin" },
397
335
{ .name = "disable", .key = 'd',
398
336
.arg = "PLUGIN",
399
337
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
403
338
{ .name = "plugin-dir", .key = 128,
404
339
.arg = "DIRECTORY",
405
340
.doc = "Specify a different plugin directory", .group = 2 },
406
{ .name = "config-file", .key = 129,
407
.arg = "FILE",
408
.doc = "Specify a different configuration file", .group = 2 },
409
{ .name = "userid", .key = 130,
410
.arg = "ID", .flags = 0,
411
.doc = "User ID the plugins will run as", .group = 3 },
412
{ .name = "groupid", .key = 131,
413
.arg = "ID", .flags = 0,
414
.doc = "Group ID the plugins will run as", .group = 3 },
415
{ .name = "debug", .key = 132,
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
341
{ .name = "userid", .key = 129,
342
.arg = "ID", .flags = 0,
343
.doc = "User ID the plugins will run as", .group = 2 },
344
{ .name = "groupid", .key = 130,
345
.arg = "ID", .flags = 0,
346
.doc = "Group ID the plugins will run as", .group = 2 },
347
{ .name = "debug", .key = 131,
348
.doc = "Debug mode", .group = 3 },
426
349
{ .name = NULL }
427
350
};
428
351
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
435
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
450
break;
451
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
473
}
474
break;
475
case 'E': /* --env-for */
352
error_t parse_opt (int key, char *arg, struct argp_state *state) {
353
/* Get the INPUT argument from `argp_parse', which we know is a
354
pointer to our plugin list pointer. */
355
plugin **plugins = state->input;
356
switch (key) {
357
case 'g':
358
if (arg != NULL){
359
char *p;
360
while((p = strsep(&arg, ",")) != NULL){
361
if(p[0] == '\0'){
362
continue;
363
}
364
if(not add_argument(getplugin(NULL, plugins), p)){
365
perror("add_argument");
366
return ARGP_ERR_UNKNOWN;
367
}
368
}
369
}
370
break;
371
case 'e':
372
if(arg == NULL){
373
break;
374
}
375
{
376
char *envdef = strdup(arg);
377
if(envdef == NULL){
378
break;
379
}
380
if(not add_environment(getplugin(NULL, plugins), envdef)){
381
perror("add_environment");
382
}
383
}
384
break;
385
case 'o':
386
if (arg != NULL){
387
char *p_name = strsep(&arg, ":");
388
if(p_name[0] == '\0'){
389
break;
390
}
391
char *opt = strsep(&arg, ":");
392
if(opt[0] == '\0'){
393
break;
394
}
395
if(opt != NULL){
396
char *p;
397
while((p = strsep(&opt, ",")) != NULL){
398
if(p[0] == '\0'){
399
continue;
400
}
401
if(not add_argument(getplugin(p_name, plugins), p)){
402
perror("add_argument");
403
return ARGP_ERR_UNKNOWN;
404
}
405
}
406
}
407
}
408
break;
409
case 'f':
410
if(arg == NULL){
411
break;
412
}
476
413
{
477
414
char *envdef = strchr(arg, ':');
478
415
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
416
break;
417
}
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(p_name == NULL){
420
break;
421
}
484
422
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
493
}
494
break;
495
case 'd': /* --disable */
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
511
}
512
break;
513
case 128: /* --plugin-dir */
514
free(plugindir);
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
break;
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
522
break;
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
break;
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
break;
545
case 132: /* --debug */
423
if(not add_environment(getplugin(p_name, plugins), envdef)){
424
perror("add_environment");
425
}
426
}
427
break;
428
case 'd':
429
if (arg != NULL){
430
plugin *p = getplugin(arg, plugins);
431
if(p == NULL){
432
return ARGP_ERR_UNKNOWN;
433
}
434
p->disabled = true;
435
}
436
break;
437
case 128:
438
plugindir = arg;
439
break;
440
case 129:
441
uid = (uid_t)strtol(arg, NULL, 10);
442
break;
443
case 130:
444
gid = (gid_t)strtol(arg, NULL, 10);
445
break;
446
case 131:
546
447
debug = true;
547
448
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
573
default:
574
return ARGP_ERR_UNKNOWN;
575
}
576
return errno; /* Set to 0 at start */
577
}
578
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
593
break;
594
case 129: /* --config-file */
595
free(argfile);
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
break;
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
case ARGP_KEY_ARG:
608
break;
609
default:
610
return ARGP_ERR_UNKNOWN;
611
}
612
return errno;
613
}
614
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
617
.args_doc = "",
449
case ARGP_KEY_ARG:
450
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
break;
452
case ARGP_KEY_END:
453
break;
454
default:
455
return ARGP_ERR_UNKNOWN;
456
}
457
return 0;
458
}
459
460
plugin *plugin_list = NULL;
461
462
struct argp argp = { .options = options, .parser = parse_opt,
463
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
618
464
.doc = "Mandos plugin runner -- Run plugins" };
619
465
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
636
goto fallback;
637
}
638
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
641
642
/* Open the configfile if available */
643
if(argfile == NULL){
644
conffp = fopen(AFILE, "r");
645
} else {
646
conffp = fopen(argfile, "r");
647
}
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
if (ret == ARGP_ERR_UNKNOWN){
468
fprintf(stderr, "Unknown error while parsing arguments\n");
469
exitstatus = EXIT_FAILURE;
470
goto fallback;
471
}
472
473
conffp = fopen(argfile, "r");
648
474
if(conffp != NULL){
649
475
char *org_line = NULL;
650
476
char *p, *arg, *new_arg, *line;
651
477
size_t size = 0;
478
ssize_t sret;
652
479
const char whitespace_delims[] = " \r\t\f\v\n";
653
480
const char comment_delim[] = "#";
654
655
custom_argc = 1;
656
custom_argv = malloc(sizeof(char*) * 2);
657
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
660
goto fallback;
661
}
662
custom_argv[0] = argv[0];
663
custom_argv[1] = NULL;
664
665
/* for each line in the config file, strip whitespace and ignore
666
commented text */
481
667
482
while(true){
668
483
sret = getline(&org_line, &size, conffp);
669
484
if(sret == -1){
670
485
break;
671
486
}
672
487
673
488
line = org_line;
674
489
arg = strsep(&line, comment_delim);
675
490
while((p = strsep(&arg, whitespace_delims)) != NULL){
677
492
continue;
678
493
}
679
494
new_arg = strdup(p);
680
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
683
free(org_line);
495
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
496
if (custom_argv == NULL){
497
perror("add_to_argv");
498
exitstatus = EXIT_FAILURE;
684
499
goto fallback;
685
500
}
686
687
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
701
}
702
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
704
501
}
705
502
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
714
503
free(org_line);
715
} else {
504
} else{
716
505
/* Check for harmful errors and go to fallback. Other errors might
717
506
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
507
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
perror("fopen");
509
exitstatus = EXIT_FAILURE;
721
510
goto fallback;
722
511
}
723
512
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
513
726
514
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
517
if (ret == ARGP_ERR_UNKNOWN){
518
fprintf(stderr, "Unknown error while parsing arguments\n");
519
exitstatus = EXIT_FAILURE;
741
520
goto fallback;
742
521
}
743
522
}
744
523
745
/* Parse actual command line arguments, to let them override the
746
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
761
goto fallback;
762
}
763
764
524
if(debug){
765
525
for(plugin *p = plugin_list; p != NULL; p=p->next){
766
526
fprintf(stderr, "Plugin: %s has %d arguments\n",
768
528
for(char **a = p->argv; *a != NULL; a++){
769
529
fprintf(stderr, "\tArg: %s\n", *a);
770
530
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
531
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
532
for(char **a = p->environ; *a != NULL; a++){
773
533
fprintf(stderr, "\t%s\n", *a);
774
534
}
775
535
}
776
536
}
777
537
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
807
538
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
539
if (ret == -1){
540
perror("setuid");
541
}
542
543
setgid(gid);
544
if (ret == -1){
545
perror("setgid");
546
}
547
548
dir = opendir(plugindir);
549
if(dir == NULL){
550
perror("Could not open plugin dir");
551
exitstatus = EXIT_FAILURE;
552
goto fallback;
553
}
554
555
/* Set the FD_CLOEXEC flag on the directory, if possible */
813
556
{
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
557
int dir_fd = dirfd(dir);
558
if(dir_fd >= 0){
559
ret = set_cloexec_flag(dir_fd);
560
if(ret < 0){
561
perror("set_cloexec_flag");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
858
564
}
859
565
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
880
566
}
881
567
882
568
FD_ZERO(&rfds_all);
883
569
884
/* Read and execute any executable in the plugin directory*/
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
continue;
891
}
892
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
if(ret == -1){
894
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
896
continue;
897
}
898
899
/* Ignore non-executable files */
900
if(not S_ISREG(st.st_mode)
901
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
902
X_OK, 0)) != 0)){
570
while(true){
571
dirst = readdir(dir);
572
573
// All directory entries have been processed
574
if(dirst == NULL){
575
if (errno == EBADF){
576
perror("readdir");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
break;
581
}
582
583
d_name_len = strlen(dirst->d_name);
584
585
// Ignore dotfiles, backup files and other junk
586
{
587
bool bad_name = false;
588
589
const char const *bad_prefixes[] = { ".", "#", NULL };
590
591
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
592
".dpkg-old",
593
".dpkg-divert", NULL };
594
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
595
size_t pre_len = strlen(*pre);
596
if((d_name_len >= pre_len)
597
and strncmp((dirst->d_name), *pre, pre_len) == 0){
598
if(debug){
599
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
600
" with bad prefix %s\n", dirst->d_name, *pre);
601
}
602
bad_name = true;
603
break;
604
}
605
}
606
607
if(bad_name){
608
continue;
609
}
610
611
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
612
size_t suf_len = strlen(*suf);
613
if((d_name_len >= suf_len)
614
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
615
== 0)){
616
if(debug){
617
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
618
" with bad suffix %s\n", dirst->d_name, *suf);
619
}
620
bad_name = true;
621
break;
622
}
623
}
624
625
if(bad_name){
626
continue;
627
}
628
}
629
630
char *filename;
631
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
632
if(ret < 0){
633
perror("asprintf");
634
continue;
635
}
636
637
ret = stat(filename, &st);
638
if (ret == -1){
639
perror("stat");
640
free(filename);
641
continue;
642
}
643
644
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
903
645
if(debug){
904
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
905
" with bad type or mode\n",
906
plugindir != NULL ? plugindir : PDIR,
907
direntries[i]->d_name);
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad type or mode\n", filename);
908
648
}
909
TEMP_FAILURE_RETRY(close(plugin_fd));
649
free(filename);
910
650
continue;
911
651
}
912
913
plugin *p = getplugin(direntries[i]->d_name);
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
914
653
if(p == NULL){
915
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
654
perror("getplugin");
655
free(filename);
917
656
continue;
918
657
}
919
658
if(p->disabled){
920
659
if(debug){
921
660
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
direntries[i]->d_name);
661
dirst->d_name);
923
662
}
924
TEMP_FAILURE_RETRY(close(plugin_fd));
663
free(filename);
925
664
continue;
926
665
}
927
666
{
928
667
/* Add global arguments to argument list for this plugin */
929
plugin *g = getplugin(NULL);
668
plugin *g = getplugin(NULL, &plugin_list);
930
669
if(g != NULL){
931
670
for(char **a = g->argv + 1; *a != NULL; a++){
932
671
if(not add_argument(p, *a)){
933
error(0, errno, "add_argument");
672
perror("add_argument");
934
673
}
935
674
}
936
675
/* Add global environment variables */
937
676
for(char **e = g->environ; *e != NULL; e++){
938
if(not add_environment(p, *e, false)){
939
error(0, errno, "add_environment");
677
if(not add_environment(p, *e)){
678
perror("add_environment");
940
679
}
941
680
}
942
681
}
943
682
}
944
/* If this plugin has any environment variables, we need to
945
duplicate the environment from this process, too. */
683
/* If this plugin has any environment variables, we will call
684
using execve and need to duplicate the environment from this
685
process, too. */
946
686
if(p->environ[0] != NULL){
947
687
for(char **e = environ; *e != NULL; e++){
948
if(not add_environment(p, *e, false)){
949
error(0, errno, "add_environment");
688
char *copy = strdup(*e);
689
if(copy == NULL){
690
perror("strdup");
691
continue;
692
}
693
if(not add_environment(p, copy)){
694
perror("add_environment");
950
695
}
951
696
}
952
697
}
953
698
954
699
int pipefd[2];
955
#ifndef O_CLOEXEC
956
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
957
#else /* O_CLOEXEC */
958
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
959
#endif /* O_CLOEXEC */
960
if(ret == -1){
961
error(0, errno, "pipe");
962
exitstatus = EX_OSERR;
963
goto fallback;
964
}
965
if(pipefd[0] >= FD_SETSIZE){
966
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
970
exitstatus = EX_OSERR;
971
goto fallback;
972
}
973
#ifndef O_CLOEXEC
974
/* Ask OS to automatic close the pipe on exec */
700
ret = pipe(pipefd);
701
if (ret == -1){
702
perror("pipe");
703
exitstatus = EXIT_FAILURE;
704
goto fallback;
705
}
975
706
ret = set_cloexec_flag(pipefd[0]);
976
707
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
980
exitstatus = EX_OSERR;
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
981
710
goto fallback;
982
711
}
983
712
ret = set_cloexec_flag(pipefd[1]);
984
713
if(ret < 0){
985
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
988
exitstatus = EX_OSERR;
714
perror("set_cloexec_flag");
715
exitstatus = EXIT_FAILURE;
989
716
goto fallback;
990
717
}
991
#endif /* not O_CLOEXEC */
992
718
/* Block SIGCHLD until process is safely in process list */
993
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
994
&sigchld_action.sa_mask,
995
NULL));
719
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
996
720
if(ret < 0){
997
error(0, errno, "sigprocmask");
998
exitstatus = EX_OSERR;
721
perror("sigprocmask");
722
exitstatus = EXIT_FAILURE;
999
723
goto fallback;
1000
724
}
1001
/* Starting a new process to be watched */
1002
pid_t pid;
1003
do {
1004
pid = fork();
1005
} while(pid == -1 and errno == EINTR);
725
// Starting a new process to be watched
726
pid_t pid = fork();
1006
727
if(pid == -1){
1007
error(0, errno, "fork");
1008
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1012
exitstatus = EX_OSERR;
728
perror("fork");
729
exitstatus = EXIT_FAILURE;
1013
730
goto fallback;
1014
731
}
1015
732
if(pid == 0){
1016
733
/* this is the child process */
1017
734
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1018
735
if(ret < 0){
1019
error(0, errno, "sigaction");
1020
_exit(EX_OSERR);
736
perror("sigaction");
737
_exit(EXIT_FAILURE);
1021
738
}
1022
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
740
if(ret < 0){
1024
error(0, errno, "sigprocmask");
1025
_exit(EX_OSERR);
741
perror("sigprocmask");
742
_exit(EXIT_FAILURE);
1026
743
}
1027
744
1028
745
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1029
746
if(ret == -1){
1030
error(0, errno, "dup2");
1031
_exit(EX_OSERR);
747
perror("dup2");
748
_exit(EXIT_FAILURE);
1032
749
}
1033
750
1034
if(fexecve(plugin_fd, p->argv,
1035
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1036
error(0, errno, "fexecve for %s/%s",
1037
plugindir != NULL ? plugindir : PDIR,
1038
direntries[i]->d_name);
1039
_exit(EX_OSERR);
751
if(dirfd(dir) < 0){
752
/* If dir has no file descriptor, we could not set FD_CLOEXEC
753
above and must now close it manually here. */
754
closedir(dir);
755
}
756
if(p->environ[0] == NULL){
757
if(execv(filename, p->argv) < 0){
758
perror("execv");
759
_exit(EXIT_FAILURE);
760
}
761
} else {
762
if(execve(filename, p->argv, p->environ) < 0){
763
perror("execve");
764
_exit(EXIT_FAILURE);
765
}
1040
766
}
1041
767
/* no return */
1042
768
}
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1047
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
769
/* parent process */
770
free(filename);
771
close(pipefd[1]); /* close unused write end of pipe */
772
process *new_process = malloc(sizeof(process));
773
if (new_process == NULL){
774
perror("malloc");
775
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
776
if(ret < 0){
1054
error(0, errno, "sigprocmask");
777
perror("sigprocmask");
1055
778
}
1056
exitstatus = EX_OSERR;
779
exitstatus = EXIT_FAILURE;
1057
780
goto fallback;
1058
781
}
1059
782
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1062
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
1063
788
/* Unblock SIGCHLD so signal handler can be run if this process
1064
789
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
791
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
792
perror("sigprocmask");
793
exitstatus = EXIT_FAILURE;
1071
794
goto fallback;
1072
795
}
1073
796
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
1088
1089
if(maxfd < new_plugin->fd){
1090
maxfd = new_plugin->fd;
1091
}
1092
}
1093
1094
free(direntries);
1095
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1097
dir_fd = -1;
1098
free_plugin(getplugin(NULL));
1099
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
break;
1103
}
1104
if(p->next == NULL){
1105
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1106
" directory?\n");
1107
free_plugin_list();
1108
}
1109
}
1110
1111
/* Main loop while running plugins exist */
1112
while(plugin_list){
797
FD_SET(new_process->fd, &rfds_all);
798
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
801
}
802
803
}
804
805
free_plugin_list(plugin_list);
806
plugin_list = NULL;
807
808
closedir(dir);
809
dir = NULL;
810
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
" directory?\n");
814
process_list = NULL;
815
}
816
while(process_list){
1113
817
fd_set rfds = rfds_all;
1114
818
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1115
if(select_ret == -1 and errno != EINTR){
1116
error(0, errno, "select");
1117
exitstatus = EX_OSERR;
819
if (select_ret == -1){
820
perror("select");
821
exitstatus = EXIT_FAILURE;
1118
822
goto fallback;
1119
823
}
1120
824
/* OK, now either a process completed, or something can be read
1121
825
from one of them */
1122
for(plugin *proc = plugin_list; proc != NULL;){
826
for(process *proc = process_list; proc ; proc = proc->next){
1123
827
/* Is this process completely done? */
1124
if(proc->completed and proc->eof){
828
if(proc->eof and proc->completed){
1125
829
/* Only accept the plugin output if it exited cleanly */
1126
830
if(not WIFEXITED(proc->status)
1127
831
or WEXITSTATUS(proc->status) != 0){
1128
832
/* Bad exit by plugin */
1129
1130
833
if(debug){
1131
834
if(WIFEXITED(proc->status)){
1132
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1133
" status %d\n", proc->name,
1134
(intmax_t) (proc->pid),
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
1135
837
WEXITSTATUS(proc->status));
1136
} else if(WIFSIGNALED(proc->status)){
1137
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1138
" signal %d: %s\n", proc->name,
1139
(intmax_t) (proc->pid),
1140
WTERMSIG(proc->status),
1141
strsignal(WTERMSIG(proc->status)));
838
} else if(WIFSIGNALED(proc->status)) {
839
fprintf(stderr, "Plugin %u killed by signal %d\n",
840
(unsigned int) (proc->pid),
841
WTERMSIG(proc->status));
1142
842
} else if(WCOREDUMP(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1144
" core\n", proc->name, (intmax_t) (proc->pid));
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
1145
845
}
1146
846
}
1147
1148
847
/* Remove the plugin */
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1153
#endif
1154
#endif
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1157
before 2.16 */
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
1161
#endif
1162
#endif
1163
848
FD_CLR(proc->fd, &rfds_all);
1164
849
/* Block signal while modifying process_list */
1165
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1166
(SIG_BLOCK,
1167
&sigchld_action.sa_mask,
1168
NULL));
850
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1169
851
if(ret < 0){
1170
error(0, errno, "sigprocmask");
1171
exitstatus = EX_OSERR;
852
perror("sigprocmask");
853
exitstatus = EXIT_FAILURE;
1172
854
goto fallback;
1173
855
}
1174
1175
plugin *next_plugin = proc->next;
1176
free_plugin(proc);
1177
proc = next_plugin;
1178
856
/* Delete this process entry from the list */
857
if(process_list == proc){
858
/* First one - simple */
859
process_list = proc->next;
860
} else {
861
/* Second one or later */
862
for(process *p = process_list; p != NULL; p = p->next){
863
if(p->next == proc){
864
p->next = proc->next;
865
break;
866
}
867
}
868
}
1179
869
/* We are done modifying process list, so unblock signal */
1180
ret = (int)(TEMP_FAILURE_RETRY
1181
(sigprocmask(SIG_UNBLOCK,
1182
&sigchld_action.sa_mask, NULL)));
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
NULL);
1183
872
if(ret < 0){
1184
error(0, errno, "sigprocmask");
1185
exitstatus = EX_OSERR;
1186
goto fallback;
1187
}
1188
1189
if(plugin_list == NULL){
1190
break;
1191
}
1192
1193
continue;
873
perror("sigprocmask");
874
}
875
free(proc->buffer);
876
free(proc);
877
/* We deleted this process from the list, so we can't go
878
proc->next. Therefore, start over from the beginning of
879
the process list */
880
break;
1194
881
}
1195
1196
882
/* This process exited nicely, so print its buffer */
1197
883
1198
884
bool bret = print_out_password(proc->buffer,
1199
885
proc->buffer_length);
1200
886
if(not bret){
1201
error(0, errno, "print_out_password");
1202
exitstatus = EX_IOERR;
887
perror("print_out_password");
888
exitstatus = EXIT_FAILURE;
1203
889
}
1204
890
goto fallback;
1205
891
}
1206
1207
892
/* This process has not completed. Does it have any output? */
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1212
#endif
1213
#endif
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1215
warning from
1216
-Wconversion
1217
in GNU libc
1218
before
1219
2.16 */
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
1223
#endif
1224
#endif
893
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1225
894
/* This process had nothing to say at this time */
1226
proc = proc->next;
1227
895
continue;
1228
896
}
1229
897
/* Before reading, make the process' data buffer large enough */
1230
898
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1231
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1232
+ (size_t) BUFFER_SIZE);
1233
if(new_buffer == NULL){
1234
error(0, errno, "malloc");
1235
exitstatus = EX_OSERR;
899
proc->buffer = realloc(proc->buffer, proc->buffer_size
900
+ (size_t) BUFFER_SIZE);
901
if (proc->buffer == NULL){
902
perror("malloc");
903
exitstatus = EXIT_FAILURE;
1236
904
goto fallback;
1237
905
}
1238
proc->buffer = new_buffer;
1239
906
proc->buffer_size += BUFFER_SIZE;
1240
907
}
1241
908
/* Read from the process */
1242
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1243
proc->buffer
1244
+ proc->buffer_length,
1245
BUFFER_SIZE));
1246
if(sret < 0){
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
910
BUFFER_SIZE);
911
if(ret < 0){
1247
912
/* Read error from this process; ignore the error */
1248
proc = proc->next;
1249
913
continue;
1250
914
}
1251
if(sret == 0){
915
if(ret == 0){
1252
916
/* got EOF */
1253
917
proc->eof = true;
1254
918
} else {
1255
proc->buffer_length += (size_t) sret;
919
proc->buffer_length += (size_t) ret;
1256
920
}
1257
921
}
1258
922
}
1259
1260
923
924
1261
925
fallback:
1262
926
1263
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1264
and exitstatus != EX_OK)){
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1265
928
/* Fallback if all plugins failed, none are found or an error
1266
929
occured */
1267
930
bool bret;
1268
931
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1269
932
char *passwordbuffer = getpass("Password: ");
1270
size_t len = strlen(passwordbuffer);
1271
/* Strip trailing newline */
1272
if(len > 0 and passwordbuffer[len-1] == '\n'){
1273
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1274
len--;
1275
}
1276
bret = print_out_password(passwordbuffer, len);
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1277
934
if(not bret){
1278
error(0, errno, "print_out_password");
1279
exitstatus = EX_IOERR;
935
perror("print_out_password");
936
exitstatus = EXIT_FAILURE;
1280
937
}
1281
938
}
1282
939
1283
940
/* Restore old signal handler */
1284
941
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1285
942
if(ret == -1){
1286
error(0, errno, "sigaction");
1287
exitstatus = EX_OSERR;
943
perror("sigaction");
944
exitstatus = EXIT_FAILURE;
1288
945
}
1289
946
1290
947
if(custom_argv != NULL){
1291
for(char **arg = custom_argv+1; *arg != NULL; arg++){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1292
949
free(*arg);
1293
950
}
1294
951
free(custom_argv);
1295
952
}
1296
1297
free(direntries);
1298
1299
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
953
free_plugin_list(plugin_list);
954
955
if(dir != NULL){
956
closedir(dir);
1301
957
}
1302
958
1303
/* Kill the processes */
1304
for(plugin *p = plugin_list; p != NULL; p = p->next){
1305
if(p->pid != 0){
1306
close(p->fd);
1307
ret = kill(p->pid, SIGTERM);
1308
if(ret == -1 and errno != ESRCH){
1309
/* Set-uid proccesses might not get closed */
1310
error(0, errno, "kill");
1311
}
959
/* Free the process list and kill the processes */
960
for(process *next; process_list != NULL; process_list = next){
961
next = process_list->next;
962
close(process_list->fd);
963
ret = kill(process_list->pid, SIGTERM);
964
if(ret == -1 and errno != ESRCH){
965
/* set-uid proccesses migth not get closed */
966
perror("kill");
1312
967
}
968
free(process_list->buffer);
969
free(process_list);
1313
970
}
1314
971
1315
972
/* Wait for any remaining child processes to terminate */
1316
do {
973
do{
1317
974
ret = wait(NULL);
1318
975
} while(ret >= 0);
1319
976
if(errno != ECHILD){
1320
error(0, errno, "wait");
977
perror("wait");
1321
978
}
1322
979
1323
free_plugin_list();
1324
1325
free(plugindir);
1326
free(argfile);
1327
1328
980
return exitstatus;
1329
981
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0