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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
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- 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 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>";
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;
84
86
85
87
typedef struct plugin{
86
88
char *name; /* can be NULL or any plugin name */
89
91
char **environ;
90
92
int envc;
91
93
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
102
94
struct plugin *next;
103
95
} plugin;
104
96
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))){
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))){
115
101
return p;
116
102
}
117
103
}
118
104
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
124
107
return NULL;
125
108
}
126
109
char *copy_name = NULL;
127
110
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
131
112
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
113
return NULL;
136
114
}
137
115
}
138
116
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
143
122
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;
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
149
125
free(copy_name);
150
126
free(new_plugin);
151
errno = e;
152
127
return NULL;
153
128
}
154
129
new_plugin->argv[0] = copy_name;
155
130
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
160
133
if(new_plugin->environ == NULL){
161
int e = errno;
162
134
free(copy_name);
163
135
free(new_plugin->argv);
164
136
free(new_plugin);
165
errno = e;
166
137
return NULL;
167
138
}
168
139
new_plugin->environ[0] = NULL;
169
170
140
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
172
142
return new_plugin;
173
143
}
174
144
175
145
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
146
static bool add_to_char_array(const char *new, char ***array,
178
147
int *len){
179
148
/* 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);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
185
151
/* Malloc check */
186
if(new_array == NULL){
152
if(*array == NULL){
187
153
return false;
188
154
}
189
*array = new_array;
190
155
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
195
157
if(copy == NULL){
196
158
return false;
197
159
}
204
166
}
205
167
206
168
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
169
static bool add_argument(plugin *p, const char *arg){
209
170
if(p == NULL){
210
171
return false;
213
174
}
214
175
215
176
/* 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){
177
static bool add_environment(plugin *p, const char *def){
218
178
if(p == NULL){
219
179
return false;
220
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
242
182
}
243
183
244
#ifndef O_CLOEXEC
184
245
185
/*
246
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
187
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
189
*/
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));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
253
193
/* If reading the flags failed, return error indication now. */
254
194
if(ret < 0){
255
195
return ret;
256
196
}
257
197
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
199
}
261
#endif /* not O_CLOEXEC */
262
200
201
process *process_list = NULL;
263
202
264
203
/* Mark processes as completed when they exit, and save their exit
265
204
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
268
206
while(true){
269
plugin *proc = plugin_list;
207
process *proc = process_list;
270
208
int status;
271
209
pid_t pid = waitpid(-1, &status, WNOHANG);
272
210
if(pid == 0){
274
212
break;
275
213
}
276
214
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
215
if (errno != ECHILD){
216
perror("waitpid");
280
217
}
281
error(0, errno, "waitpid");
218
/* No child processes */
219
break;
282
220
}
283
221
284
222
/* A child exited, find it in process_list */
285
223
while(proc != NULL and proc->pid != pid){
286
224
proc = proc->next;
290
228
continue;
291
229
}
292
230
proc->status = status;
293
proc->completed = 1;
231
proc->completed = true;
294
232
}
295
errno = old_errno;
296
233
}
297
234
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){
235
bool print_out_password(const char *buffer, size_t length){
301
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
302
240
for(size_t written = 0; written < length; written += (size_t)ret){
303
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
242
length - written));
309
247
return true;
310
248
}
311
249
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
}
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;
337
256
}
338
}
339
340
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;
341
269
}
342
270
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
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);
346
283
}
347
284
}
348
285
349
286
int main(int argc, char *argv[]){
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
353
289
FILE *conffp;
354
struct dirent **direntries = NULL;
290
size_t d_name_len;
291
DIR *dir = NULL;
292
struct dirent *dirst;
355
293
struct stat st;
356
294
fd_set rfds_all;
357
295
int ret, maxfd = 0;
358
ssize_t sret;
359
296
uid_t uid = 65534;
360
297
gid_t gid = 65534;
361
298
bool debug = false;
365
302
.sa_flags = SA_NOCLDSTOP };
366
303
char **custom_argv = NULL;
367
304
int custom_argc = 0;
368
int dir_fd = -1;
369
305
370
306
/* Establish a signal handler */
371
307
sigemptyset(&sigchld_action.sa_mask);
372
308
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
309
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
310
perror("sigaddset");
311
exitstatus = EXIT_FAILURE;
376
312
goto fallback;
377
313
}
378
314
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
315
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
316
perror("sigaction");
317
exitstatus = EXIT_FAILURE;
382
318
goto fallback;
383
319
}
384
320
387
323
{ .name = "global-options", .key = 'g',
388
324
.arg = "OPTION[,OPTION[,...]]",
389
325
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
326
{ .name = "global-envs", .key = 'e',
391
327
.arg = "VAR=value",
392
328
.doc = "Environment variable passed to all plugins" },
393
329
{ .name = "options-for", .key = 'o',
394
330
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
331
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
332
{ .name = "envs-for", .key = 'f',
397
333
.arg = "PLUGIN:ENV=value",
398
334
.doc = "Environment variable passed to specified plugin" },
399
335
{ .name = "disable", .key = 'd',
400
336
.arg = "PLUGIN",
401
337
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
405
338
{ .name = "plugin-dir", .key = 128,
406
339
.arg = "DIRECTORY",
407
340
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
432
349
{ .name = NULL }
433
350
};
434
351
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 */
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
}
482
413
{
483
414
char *envdef = strchr(arg, ':');
484
415
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
416
break;
417
}
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(p_name == NULL){
420
break;
421
}
490
422
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 */
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:
552
447
debug = true;
553
448
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
default:
587
return ARGP_ERR_UNKNOWN;
588
}
589
return errno; /* Set to 0 at start */
590
}
591
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
606
break;
607
case 129: /* --config-file */
608
free(argfile);
609
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
612
}
613
break;
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
case ARGP_KEY_ARG:
622
break;
623
default:
624
return ARGP_ERR_UNKNOWN;
625
}
626
return errno;
627
}
628
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
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]",
632
464
.doc = "Mandos plugin runner -- Run plugins" };
633
465
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
650
goto fallback;
651
}
652
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
655
656
/* Open the configfile if available */
657
if(argfile == NULL){
658
conffp = fopen(AFILE, "r");
659
} else {
660
conffp = fopen(argfile, "r");
661
}
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");
662
474
if(conffp != NULL){
663
475
char *org_line = NULL;
664
476
char *p, *arg, *new_arg, *line;
665
477
size_t size = 0;
478
ssize_t sret;
666
479
const char whitespace_delims[] = " \r\t\f\v\n";
667
480
const char comment_delim[] = "#";
668
669
custom_argc = 1;
670
custom_argv = malloc(sizeof(char*) * 2);
671
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
674
goto fallback;
675
}
676
custom_argv[0] = argv[0];
677
custom_argv[1] = NULL;
678
679
/* for each line in the config file, strip whitespace and ignore
680
commented text */
481
681
482
while(true){
682
483
sret = getline(&org_line, &size, conffp);
683
484
if(sret == -1){
684
485
break;
685
486
}
686
487
687
488
line = org_line;
688
489
arg = strsep(&line, comment_delim);
689
490
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
492
continue;
692
493
}
693
494
new_arg = strdup(p);
694
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
697
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;
698
499
goto fallback;
699
500
}
700
701
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((unsigned int)
705
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
501
}
719
502
}
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
503
free(org_line);
729
} else {
504
} else{
730
505
/* Check for harmful errors and go to fallback. Other errors might
731
506
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
507
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
perror("fopen");
509
exitstatus = EXIT_FAILURE;
735
510
goto fallback;
736
511
}
737
512
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
513
740
514
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);
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
517
if (ret == ARGP_ERR_UNKNOWN){
518
fprintf(stderr, "Unknown error while parsing arguments\n");
519
exitstatus = EXIT_FAILURE;
520
goto fallback;
793
521
}
794
522
}
795
523
800
528
for(char **a = p->argv; *a != NULL; a++){
801
529
fprintf(stderr, "\tArg: %s\n", *a);
802
530
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
531
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
532
for(char **a = p->environ; *a != NULL; a++){
805
533
fprintf(stderr, "\t%s\n", *a);
806
534
}
807
535
}
808
536
}
809
537
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<http://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
TEMP_FAILURE_RETRY(close(plugindir_fd));
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
839
538
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* 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 */
845
556
{
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;
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;
890
564
}
891
565
}
892
return 1;
893
}
894
895
#ifdef __GLIBC__
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
909
direntries = NULL;
910
exitstatus = EX_OSERR;
911
goto fallback;
912
566
}
913
567
914
568
FD_ZERO(&rfds_all);
915
569
916
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
918
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
920
if(plugin_fd == -1){
921
error(0, errno, "Could not open plugin");
922
free(direntries[i]);
923
continue;
924
}
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
926
if(ret == -1){
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
930
continue;
931
}
932
933
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
936
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)){
937
645
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad type or mode\n", filename);
942
648
}
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
free(direntries[i]);
649
free(filename);
945
650
continue;
946
651
}
947
948
plugin *p = getplugin(direntries[i]->d_name);
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
949
653
if(p == NULL){
950
error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
952
free(direntries[i]);
654
perror("getplugin");
655
free(filename);
953
656
continue;
954
657
}
955
658
if(p->disabled){
956
659
if(debug){
957
660
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
661
dirst->d_name);
959
662
}
960
TEMP_FAILURE_RETRY(close(plugin_fd));
961
free(direntries[i]);
663
free(filename);
962
664
continue;
963
665
}
964
666
{
965
667
/* Add global arguments to argument list for this plugin */
966
plugin *g = getplugin(NULL);
668
plugin *g = getplugin(NULL, &plugin_list);
967
669
if(g != NULL){
968
670
for(char **a = g->argv + 1; *a != NULL; a++){
969
671
if(not add_argument(p, *a)){
970
error(0, errno, "add_argument");
672
perror("add_argument");
971
673
}
972
674
}
973
675
/* Add global environment variables */
974
676
for(char **e = g->environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
677
if(not add_environment(p, *e)){
678
perror("add_environment");
977
679
}
978
680
}
979
681
}
980
682
}
981
/* If this plugin has any environment variables, we need to
982
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. */
983
686
if(p->environ[0] != NULL){
984
687
for(char **e = environ; *e != NULL; e++){
985
if(not add_environment(p, *e, false)){
986
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");
987
695
}
988
696
}
989
697
}
990
698
991
699
int pipefd[2];
992
#ifndef O_CLOEXEC
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
997
if(ret == -1){
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1001
goto fallback;
1002
}
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1005
FD_SETSIZE);
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1010
goto fallback;
1011
}
1012
#ifndef O_CLOEXEC
1013
/* 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
}
1014
706
ret = set_cloexec_flag(pipefd[0]);
1015
707
if(ret < 0){
1016
error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
1021
710
goto fallback;
1022
711
}
1023
712
ret = set_cloexec_flag(pipefd[1]);
1024
713
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
714
perror("set_cloexec_flag");
715
exitstatus = EXIT_FAILURE;
1030
716
goto fallback;
1031
717
}
1032
#endif /* not O_CLOEXEC */
1033
718
/* Block SIGCHLD until process is safely in process list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
719
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1037
720
if(ret < 0){
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
721
perror("sigprocmask");
722
exitstatus = EXIT_FAILURE;
1041
723
goto fallback;
1042
724
}
1043
/* Starting a new process to be watched */
1044
pid_t pid;
1045
do {
1046
pid = fork();
1047
} while(pid == -1 and errno == EINTR);
725
// Starting a new process to be watched
726
pid_t pid = fork();
1048
727
if(pid == -1){
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
TEMP_FAILURE_RETRY(close(pipefd[0]));
1053
TEMP_FAILURE_RETRY(close(pipefd[1]));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
728
perror("fork");
729
exitstatus = EXIT_FAILURE;
1056
730
goto fallback;
1057
731
}
1058
732
if(pid == 0){
1059
733
/* this is the child process */
1060
734
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
735
if(ret < 0){
1062
error(0, errno, "sigaction");
1063
_exit(EX_OSERR);
736
perror("sigaction");
737
_exit(EXIT_FAILURE);
1064
738
}
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1066
740
if(ret < 0){
1067
error(0, errno, "sigprocmask");
1068
_exit(EX_OSERR);
741
perror("sigprocmask");
742
_exit(EXIT_FAILURE);
1069
743
}
1070
744
1071
745
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1072
746
if(ret == -1){
1073
error(0, errno, "dup2");
1074
_exit(EX_OSERR);
747
perror("dup2");
748
_exit(EXIT_FAILURE);
1075
749
}
1076
750
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
1082
_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
}
1083
766
}
1084
767
/* no return */
1085
768
}
1086
/* Parent process */
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1088
pipe */
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
1091
if(new_plugin == NULL){
1092
error(0, errno, "getplugin");
1093
ret = (int)(TEMP_FAILURE_RETRY
1094
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1095
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);
1096
776
if(ret < 0){
1097
error(0, errno, "sigprocmask");
777
perror("sigprocmask");
1098
778
}
1099
exitstatus = EX_OSERR;
1100
free(direntries[i]);
779
exitstatus = EXIT_FAILURE;
1101
780
goto fallback;
1102
781
}
1103
free(direntries[i]);
1104
1105
new_plugin->pid = pid;
1106
new_plugin->fd = pipefd[0];
1107
782
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
1108
788
/* Unblock SIGCHLD so signal handler can be run if this process
1109
789
has already completed */
1110
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1113
791
if(ret < 0){
1114
error(0, errno, "sigprocmask");
1115
exitstatus = EX_OSERR;
792
perror("sigprocmask");
793
exitstatus = EXIT_FAILURE;
1116
794
goto fallback;
1117
795
}
1118
796
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wsign-conversion"
1123
#endif
1124
#endif
1125
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1126
-Wconversion in GNU libc
1127
before 2.16 */
1128
#if defined (__GNUC__) and defined (__GLIBC__)
1129
#if not __GLIBC_PREREQ(2, 16)
1130
#pragma GCC diagnostic pop
1131
#endif
1132
#endif
1133
1134
if(maxfd < new_plugin->fd){
1135
maxfd = new_plugin->fd;
1136
}
1137
}
1138
1139
free(direntries);
1140
direntries = NULL;
1141
TEMP_FAILURE_RETRY(close(dir_fd));
1142
dir_fd = -1;
1143
free_plugin(getplugin(NULL));
1144
1145
for(plugin *p = plugin_list; p != NULL; p = p->next){
1146
if(p->pid != 0){
1147
break;
1148
}
1149
if(p->next == NULL){
1150
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1151
" directory?\n");
1152
free_plugin_list();
1153
}
1154
}
1155
1156
/* Main loop while running plugins exist */
1157
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){
1158
817
fd_set rfds = rfds_all;
1159
818
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1160
if(select_ret == -1 and errno != EINTR){
1161
error(0, errno, "select");
1162
exitstatus = EX_OSERR;
819
if (select_ret == -1){
820
perror("select");
821
exitstatus = EXIT_FAILURE;
1163
822
goto fallback;
1164
823
}
1165
824
/* OK, now either a process completed, or something can be read
1166
825
from one of them */
1167
for(plugin *proc = plugin_list; proc != NULL;){
826
for(process *proc = process_list; proc ; proc = proc->next){
1168
827
/* Is this process completely done? */
1169
if(proc->completed and proc->eof){
828
if(proc->eof and proc->completed){
1170
829
/* Only accept the plugin output if it exited cleanly */
1171
830
if(not WIFEXITED(proc->status)
1172
831
or WEXITSTATUS(proc->status) != 0){
1173
832
/* Bad exit by plugin */
1174
1175
833
if(debug){
1176
834
if(WIFEXITED(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1178
" status %d\n", proc->name,
1179
(intmax_t) (proc->pid),
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
1180
837
WEXITSTATUS(proc->status));
1181
} else if(WIFSIGNALED(proc->status)){
1182
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1183
" signal %d: %s\n", proc->name,
1184
(intmax_t) (proc->pid),
1185
WTERMSIG(proc->status),
1186
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));
1187
842
} else if(WCOREDUMP(proc->status)){
1188
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1189
" core\n", proc->name, (intmax_t) (proc->pid));
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
1190
845
}
1191
846
}
1192
1193
847
/* Remove the plugin */
1194
#if defined (__GNUC__) and defined (__GLIBC__)
1195
#if not __GLIBC_PREREQ(2, 16)
1196
#pragma GCC diagnostic push
1197
#pragma GCC diagnostic ignored "-Wsign-conversion"
1198
#endif
1199
#endif
1200
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1201
-Wconversion in GNU libc
1202
before 2.16 */
1203
#if defined (__GNUC__) and defined (__GLIBC__)
1204
#if not __GLIBC_PREREQ(2, 16)
1205
#pragma GCC diagnostic pop
1206
#endif
1207
#endif
1208
848
FD_CLR(proc->fd, &rfds_all);
1209
849
/* Block signal while modifying process_list */
1210
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1211
(SIG_BLOCK,
1212
&sigchld_action.sa_mask,
1213
NULL));
850
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1214
851
if(ret < 0){
1215
error(0, errno, "sigprocmask");
1216
exitstatus = EX_OSERR;
852
perror("sigprocmask");
853
exitstatus = EXIT_FAILURE;
1217
854
goto fallback;
1218
855
}
1219
1220
plugin *next_plugin = proc->next;
1221
free_plugin(proc);
1222
proc = next_plugin;
1223
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
}
1224
869
/* We are done modifying process list, so unblock signal */
1225
ret = (int)(TEMP_FAILURE_RETRY
1226
(sigprocmask(SIG_UNBLOCK,
1227
&sigchld_action.sa_mask, NULL)));
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
NULL);
1228
872
if(ret < 0){
1229
error(0, errno, "sigprocmask");
1230
exitstatus = EX_OSERR;
1231
goto fallback;
1232
}
1233
1234
if(plugin_list == NULL){
1235
break;
1236
}
1237
1238
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;
1239
881
}
1240
1241
882
/* This process exited nicely, so print its buffer */
1242
883
1243
884
bool bret = print_out_password(proc->buffer,
1244
885
proc->buffer_length);
1245
886
if(not bret){
1246
error(0, errno, "print_out_password");
1247
exitstatus = EX_IOERR;
887
perror("print_out_password");
888
exitstatus = EXIT_FAILURE;
1248
889
}
1249
890
goto fallback;
1250
891
}
1251
1252
892
/* This process has not completed. Does it have any output? */
1253
#if defined (__GNUC__) and defined (__GLIBC__)
1254
#if not __GLIBC_PREREQ(2, 16)
1255
#pragma GCC diagnostic push
1256
#pragma GCC diagnostic ignored "-Wsign-conversion"
1257
#endif
1258
#endif
1259
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1260
warning from
1261
-Wconversion
1262
in GNU libc
1263
before
1264
2.16 */
1265
#if defined (__GNUC__) and defined (__GLIBC__)
1266
#if not __GLIBC_PREREQ(2, 16)
1267
#pragma GCC diagnostic pop
1268
#endif
1269
#endif
893
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1270
894
/* This process had nothing to say at this time */
1271
proc = proc->next;
1272
895
continue;
1273
896
}
1274
897
/* Before reading, make the process' data buffer large enough */
1275
898
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1276
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1277
+ (size_t) BUFFER_SIZE);
1278
if(new_buffer == NULL){
1279
error(0, errno, "malloc");
1280
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;
1281
904
goto fallback;
1282
905
}
1283
proc->buffer = new_buffer;
1284
906
proc->buffer_size += BUFFER_SIZE;
1285
907
}
1286
908
/* Read from the process */
1287
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1288
proc->buffer
1289
+ proc->buffer_length,
1290
BUFFER_SIZE));
1291
if(sret < 0){
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
910
BUFFER_SIZE);
911
if(ret < 0){
1292
912
/* Read error from this process; ignore the error */
1293
proc = proc->next;
1294
913
continue;
1295
914
}
1296
if(sret == 0){
915
if(ret == 0){
1297
916
/* got EOF */
1298
917
proc->eof = true;
1299
918
} else {
1300
proc->buffer_length += (size_t) sret;
919
proc->buffer_length += (size_t) ret;
1301
920
}
1302
921
}
1303
922
}
1304
1305
923
924
1306
925
fallback:
1307
926
1308
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1309
and exitstatus != EX_OK)){
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1310
928
/* Fallback if all plugins failed, none are found or an error
1311
929
occured */
1312
930
bool bret;
1313
931
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1314
932
char *passwordbuffer = getpass("Password: ");
1315
size_t len = strlen(passwordbuffer);
1316
/* Strip trailing newline */
1317
if(len > 0 and passwordbuffer[len-1] == '\n'){
1318
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1319
len--;
1320
}
1321
bret = print_out_password(passwordbuffer, len);
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1322
934
if(not bret){
1323
error(0, errno, "print_out_password");
1324
exitstatus = EX_IOERR;
935
perror("print_out_password");
936
exitstatus = EXIT_FAILURE;
1325
937
}
1326
938
}
1327
939
1328
940
/* Restore old signal handler */
1329
941
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1330
942
if(ret == -1){
1331
error(0, errno, "sigaction");
1332
exitstatus = EX_OSERR;
943
perror("sigaction");
944
exitstatus = EXIT_FAILURE;
1333
945
}
1334
946
1335
947
if(custom_argv != NULL){
1336
for(char **arg = custom_argv+1; *arg != NULL; arg++){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1337
949
free(*arg);
1338
950
}
1339
951
free(custom_argv);
1340
952
}
1341
1342
free(direntries);
1343
1344
if(dir_fd != -1){
1345
TEMP_FAILURE_RETRY(close(dir_fd));
953
free_plugin_list(plugin_list);
954
955
if(dir != NULL){
956
closedir(dir);
1346
957
}
1347
958
1348
/* Kill the processes */
1349
for(plugin *p = plugin_list; p != NULL; p = p->next){
1350
if(p->pid != 0){
1351
close(p->fd);
1352
ret = kill(p->pid, SIGTERM);
1353
if(ret == -1 and errno != ESRCH){
1354
/* Set-uid proccesses might not get closed */
1355
error(0, errno, "kill");
1356
}
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");
1357
967
}
968
free(process_list->buffer);
969
free(process_list);
1358
970
}
1359
971
1360
972
/* Wait for any remaining child processes to terminate */
1361
do {
973
do{
1362
974
ret = wait(NULL);
1363
975
} while(ret >= 0);
1364
976
if(errno != ECHILD){
1365
error(0, errno, "wait");
977
perror("wait");
1366
978
}
1367
979
1368
free_plugin_list();
1369
1370
free(plugindir);
1371
free(pluginhelperdir);
1372
free(argfile);
1373
1374
980
return exitstatus;
1375
981
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0