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- Committer: Teddy Hogeborn
- Date: 2016-06-23 19:07:23 UTC
- Revision ID: teddy@recompile.se-20160623190723-59lqa4gb3eykltzt
Server: Fix bug with --interface flag when "cc" is not installed.
* mandos (IPv6_TCPServer.server_bind): Since we fall back to setting
SO_BINDTODEVICE to a hard-coded value if we failed to find out what
it is, declare it as global so Python does not think that we are
creating a new local variable.
* mandos (IPv6_TCPServer.server_bind): Since we fall back to setting
SO_BINDTODEVICE to a hard-coded value if we failed to find out what
it is, declare it as global so Python does not think that we are
creating a new local variable.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
52
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
66
74
67
75
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
76
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
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>";
86
83
87
84
typedef struct plugin{
88
85
char *name; /* can be NULL or any plugin name */
91
88
char **environ;
92
89
int envc;
93
90
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;
94
101
struct plugin *next;
95
102
} plugin;
96
103
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))){
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))){
101
114
return p;
102
115
}
103
116
}
104
117
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
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){
107
123
return NULL;
108
124
}
109
125
char *copy_name = NULL;
110
126
if(name != NULL){
111
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
112
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
113
134
return NULL;
114
135
}
115
136
}
116
137
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
122
142
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
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;
125
148
free(copy_name);
126
149
free(new_plugin);
150
errno = e;
127
151
return NULL;
128
152
}
129
153
new_plugin->argv[0] = copy_name;
130
154
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
133
159
if(new_plugin->environ == NULL){
160
int e = errno;
134
161
free(copy_name);
135
162
free(new_plugin->argv);
136
163
free(new_plugin);
164
errno = e;
137
165
return NULL;
138
166
}
139
167
new_plugin->environ[0] = NULL;
168
140
169
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
170
plugin_list = new_plugin;
142
171
return new_plugin;
143
172
}
144
173
145
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
146
176
static bool add_to_char_array(const char *new, char ***array,
147
177
int *len){
148
178
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
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);
151
184
/* Malloc check */
152
if(*array == NULL){
185
if(new_array == NULL){
153
186
return false;
154
187
}
188
*array = new_array;
155
189
/* Make a copy of the new string */
156
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
157
194
if(copy == NULL){
158
195
return false;
159
196
}
166
203
}
167
204
168
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
169
207
static bool add_argument(plugin *p, const char *arg){
170
208
if(p == NULL){
171
209
return false;
174
212
}
175
213
176
214
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
178
217
if(p == NULL){
179
218
return false;
180
219
}
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
}
181
240
return add_to_char_array(def, &(p->environ), &(p->envc));
182
241
}
183
242
184
243
#ifndef O_CLOEXEC
185
244
/*
186
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
246
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
248
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
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));
193
252
/* If reading the flags failed, return error indication now. */
194
253
if(ret < 0){
195
254
return ret;
196
255
}
197
256
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
199
259
}
260
#endif /* not O_CLOEXEC */
200
261
201
process *process_list = NULL;
202
262
203
263
/* Mark processes as completed when they exit, and save their exit
204
264
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
206
267
while(true){
207
process *proc = process_list;
268
plugin *proc = plugin_list;
208
269
int status;
209
270
pid_t pid = waitpid(-1, &status, WNOHANG);
210
271
if(pid == 0){
212
273
break;
213
274
}
214
275
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
217
279
}
218
/* No child processes */
219
break;
280
error(0, errno, "waitpid");
220
281
}
221
282
222
283
/* A child exited, find it in process_list */
223
284
while(proc != NULL and proc->pid != pid){
224
285
proc = proc->next;
228
289
continue;
229
290
}
230
291
proc->status = status;
231
proc->completed = true;
292
proc->completed = 1;
232
293
}
294
errno = old_errno;
233
295
}
234
296
235
bool print_out_password(const char *buffer, size_t length){
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){
236
300
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
301
for(size_t written = 0; written < length; written += (size_t)ret){
241
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
303
length - written));
247
308
return true;
248
309
}
249
310
250
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
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
}
336
}
337
}
338
339
free(plugin_node);
340
}
341
342
static void free_plugin_list(void){
343
while(plugin_list != NULL){
344
free_plugin(plugin_list);
262
345
}
263
346
}
264
347
265
348
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
char *argfile = NULL;
268
352
FILE *conffp;
269
size_t d_name_len;
270
DIR *dir = NULL;
271
struct dirent *dirst;
353
struct dirent **direntries = NULL;
272
354
struct stat st;
273
355
fd_set rfds_all;
274
356
int ret, maxfd = 0;
357
ssize_t sret;
275
358
uid_t uid = 65534;
276
359
gid_t gid = 65534;
277
360
bool debug = false;
281
364
.sa_flags = SA_NOCLDSTOP };
282
365
char **custom_argv = NULL;
283
366
int custom_argc = 0;
367
int dir_fd = -1;
284
368
285
369
/* Establish a signal handler */
286
370
sigemptyset(&sigchld_action.sa_mask);
287
371
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
288
372
if(ret == -1){
289
perror("sigaddset");
290
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
291
375
goto fallback;
292
376
}
293
377
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
294
378
if(ret == -1){
295
perror("sigaction");
296
exitstatus = EXIT_FAILURE;
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
297
381
goto fallback;
298
382
}
299
383
302
386
{ .name = "global-options", .key = 'g',
303
387
.arg = "OPTION[,OPTION[,...]]",
304
388
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
389
{ .name = "global-env", .key = 'G',
306
390
.arg = "VAR=value",
307
391
.doc = "Environment variable passed to all plugins" },
308
392
{ .name = "options-for", .key = 'o',
309
393
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
394
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
395
{ .name = "env-for", .key = 'E',
312
396
.arg = "PLUGIN:ENV=value",
313
397
.doc = "Environment variable passed to specified plugin" },
314
398
{ .name = "disable", .key = 'd',
315
399
.arg = "PLUGIN",
316
400
.doc = "Disable a specific plugin", .group = 1 },
401
{ .name = "enable", .key = 'e',
402
.arg = "PLUGIN",
403
.doc = "Enable a specific plugin", .group = 1 },
317
404
{ .name = "plugin-dir", .key = 128,
318
405
.arg = "DIRECTORY",
319
406
.doc = "Specify a different plugin directory", .group = 2 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
407
{ .name = "config-file", .key = 129,
408
.arg = "FILE",
409
.doc = "Specify a different configuration file", .group = 2 },
410
{ .name = "userid", .key = 130,
411
.arg = "ID", .flags = 0,
412
.doc = "User ID the plugins will run as", .group = 3 },
413
{ .name = "groupid", .key = 131,
414
.arg = "ID", .flags = 0,
415
.doc = "Group ID the plugins will run as", .group = 3 },
416
{ .name = "debug", .key = 132,
417
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
/*
423
* These reproduce what we would get without ARGP_NO_HELP
424
*/
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
328
431
{ .name = NULL }
329
432
};
330
433
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
335
switch (key) {
336
case 'g':
337
if (arg != NULL){
338
char *p;
339
while((p = strsep(&arg, ",")) != NULL){
340
if(p[0] == '\0'){
341
continue;
342
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
344
perror("add_argument");
345
return ARGP_ERR_UNKNOWN;
346
}
347
}
348
}
349
break;
350
case 'e':
351
if(arg == NULL){
352
break;
353
}
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
362
}
363
break;
364
case 'o':
365
if (arg != NULL){
366
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
368
break;
369
}
370
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
372
break;
373
}
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
}
387
break;
388
case 'f':
389
if(arg == NULL){
390
break;
391
}
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
437
switch(key){
438
char *tmp;
439
intmax_t tmp_id;
440
case 'g': /* --global-options */
441
{
442
char *plugin_option;
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
446
}
447
}
448
errno = 0;
449
}
450
break;
451
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
454
}
455
break;
456
case 'o': /* --options-for */
457
{
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
461
errno = EINVAL;
462
break;
463
}
464
*option_list = '\0';
465
option_list++;
466
if(arg[0] == '\0'){
467
argp_error(state, "Empty plugin name");
468
errno = EINVAL;
469
break;
470
}
471
char *option;
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
474
break;
475
}
476
}
477
errno = 0;
478
}
479
break;
480
case 'E': /* --env-for */
392
481
{
393
482
char *envdef = strchr(arg, ':');
394
483
if(envdef == NULL){
395
break;
396
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
break;
487
}
488
*envdef = '\0';
401
489
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
410
if(p == NULL){
411
return ARGP_ERR_UNKNOWN;
412
}
413
p->disabled = true;
414
}
415
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
420
uid = (uid_t)strtol(arg, NULL, 10);
421
break;
422
case 130:
423
gid = (gid_t)strtol(arg, NULL, 10);
424
break;
425
case 131:
490
if(arg[0] == '\0'){
491
argp_error(state, "Empty plugin name");
492
errno = EINVAL;
493
break;
494
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
497
}
498
}
499
break;
500
case 'd': /* --disable */
501
{
502
plugin *p = getplugin(arg);
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
506
}
507
}
508
break;
509
case 'e': /* --enable */
510
{
511
plugin *p = getplugin(arg);
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
515
}
516
}
517
break;
518
case 128: /* --plugin-dir */
519
free(plugindir);
520
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
524
break;
525
case 129: /* --config-file */
526
/* This is already done by parse_opt_config_file() */
527
break;
528
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
530
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
534
break;
535
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
538
break;
539
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
541
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
545
break;
546
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
549
break;
550
case 132: /* --debug */
426
551
debug = true;
427
552
break;
428
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
/*
561
* These reproduce what we would get without ARGP_NO_HELP
562
*/
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
572
exit(EXIT_SUCCESS);
573
break;
574
/*
575
* When adding more options before this line, remember to also add a
576
* "case" to the "parse_opt_config_file" function below.
577
*/
578
case ARGP_KEY_ARG:
579
/* Cryptsetup always passes an argument, which is an empty
580
string if "none" was specified in /etc/crypttab. So if
581
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
584
}
585
default:
586
return ARGP_ERR_UNKNOWN;
587
}
588
return errno; /* Set to 0 at start */
589
}
590
591
/* This option parser is the same as parse_opt() above, except it
592
ignores everything but the --config-file option. */
593
error_t parse_opt_config_file(int key, char *arg,
594
__attribute__((unused))
595
struct argp_state *state){
596
errno = 0;
597
switch(key){
598
case 'g': /* --global-options */
599
case 'G': /* --global-env */
600
case 'o': /* --options-for */
601
case 'E': /* --env-for */
602
case 'd': /* --disable */
603
case 'e': /* --enable */
604
case 128: /* --plugin-dir */
605
break;
606
case 129: /* --config-file */
607
free(argfile);
608
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
611
}
612
break;
613
case 130: /* --userid */
614
case 131: /* --groupid */
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
620
case ARGP_KEY_ARG:
621
break;
622
default:
623
return ARGP_ERR_UNKNOWN;
624
}
625
return errno;
626
}
627
628
struct argp argp = { .options = options,
629
.parser = parse_opt_config_file,
630
.args_doc = "",
443
631
.doc = "Mandos plugin runner -- Run plugins" };
444
632
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
447
fprintf(stderr, "Unknown error while parsing arguments\n");
448
exitstatus = EXIT_FAILURE;
449
goto fallback;
450
}
451
452
conffp = fopen(argfile, "r");
633
/* Parse using parse_opt_config_file() in order to get the custom
634
config file location, if any. */
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
637
NULL, NULL);
638
switch(ret){
639
case 0:
640
break;
641
case ENOMEM:
642
default:
643
errno = ret;
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
646
goto fallback;
647
case EINVAL:
648
exitstatus = EX_USAGE;
649
goto fallback;
650
}
651
652
/* Reset to the normal argument parser */
653
argp.parser = parse_opt;
654
655
/* Open the configfile if available */
656
if(argfile == NULL){
657
conffp = fopen(AFILE, "r");
658
} else {
659
conffp = fopen(argfile, "r");
660
}
453
661
if(conffp != NULL){
454
662
char *org_line = NULL;
455
663
char *p, *arg, *new_arg, *line;
456
664
size_t size = 0;
457
ssize_t sret;
458
665
const char whitespace_delims[] = " \r\t\f\v\n";
459
666
const char comment_delim[] = "#";
460
667
461
668
custom_argc = 1;
462
669
custom_argv = malloc(sizeof(char*) * 2);
463
670
if(custom_argv == NULL){
464
perror("malloc");
465
exitstatus = EXIT_FAILURE;
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
466
673
goto fallback;
467
674
}
468
675
custom_argv[0] = argv[0];
469
676
custom_argv[1] = NULL;
470
677
678
/* for each line in the config file, strip whitespace and ignore
679
commented text */
471
680
while(true){
472
681
sret = getline(&org_line, &size, conffp);
473
682
if(sret == -1){
474
683
break;
475
684
}
476
685
477
686
line = org_line;
478
687
arg = strsep(&line, comment_delim);
479
688
while((p = strsep(&arg, whitespace_delims)) != NULL){
481
690
continue;
482
691
}
483
692
new_arg = strdup(p);
484
693
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
696
free(org_line);
697
goto fallback;
698
}
699
485
700
custom_argc += 1;
486
custom_argv = realloc(custom_argv, sizeof(char *)
487
* ((unsigned int) custom_argc + 1));
488
if(custom_argv == NULL){
489
perror("realloc");
490
exitstatus = EXIT_FAILURE;
491
free(org_line);
492
goto fallback;
701
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
493
713
}
494
714
custom_argv[custom_argc-1] = new_arg;
495
custom_argv[custom_argc] = NULL;
715
custom_argv[custom_argc] = NULL;
496
716
}
497
717
}
718
do {
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
721
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
724
goto fallback;
725
}
498
726
free(org_line);
499
} else{
727
} else {
500
728
/* Check for harmful errors and go to fallback. Other errors might
501
729
not affect opening plugins */
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
perror("fopen");
504
exitstatus = EXIT_FAILURE;
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
505
733
goto fallback;
506
734
}
507
735
}
508
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
509
738
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
512
fprintf(stderr, "Unknown error while parsing arguments\n");
513
exitstatus = EXIT_FAILURE;
514
goto fallback;
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
741
NULL, NULL);
742
switch(ret){
743
case 0:
744
break;
745
case ENOMEM:
746
default:
747
errno = ret;
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
750
goto fallback;
751
case EINVAL:
752
exitstatus = EX_CONFIG;
753
goto fallback;
754
}
755
}
756
757
/* Parse actual command line arguments, to let them override the
758
config file */
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
761
NULL, NULL);
762
switch(ret){
763
case 0:
764
break;
765
case ENOMEM:
766
default:
767
errno = ret;
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
770
goto fallback;
771
case EINVAL:
772
exitstatus = EX_USAGE;
773
goto fallback;
774
}
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
515
791
}
516
792
}
517
793
522
798
for(char **a = p->argv; *a != NULL; a++){
523
799
fprintf(stderr, "\tArg: %s\n", *a);
524
800
}
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
526
802
for(char **a = p->environ; *a != NULL; a++){
527
803
fprintf(stderr, "\t%s\n", *a);
528
804
}
529
805
}
530
806
}
531
807
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<http://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
834
if(ret == -1){
835
error(0, errno, "setgid");
836
}
532
837
ret = setuid(uid);
533
if (ret == -1){
534
perror("setuid");
535
}
536
537
setgid(gid);
538
if (ret == -1){
539
perror("setgid");
540
}
541
542
dir = opendir(plugindir);
543
if(dir == NULL){
544
perror("Could not open plugin dir");
545
exitstatus = EXIT_FAILURE;
546
goto fallback;
547
}
548
549
/* Set the FD_CLOEXEC flag on the directory, if possible */
838
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
550
843
{
551
int dir_fd = dirfd(dir);
552
if(dir_fd >= 0){
553
ret = set_cloexec_flag(dir_fd);
554
if(ret < 0){
555
perror("set_cloexec_flag");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
851
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
854
goto fallback;
855
}
856
857
#ifndef O_CLOEXEC
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
860
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
863
goto fallback;
864
}
865
#endif /* O_CLOEXEC */
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
558
888
}
559
889
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
560
900
}
561
901
562
902
FD_ZERO(&rfds_all);
563
903
564
while(true){
565
dirst = readdir(dir);
566
567
// All directory entries have been processed
568
if(dirst == NULL){
569
if (errno == EBADF){
570
perror("readdir");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
574
break;
575
}
576
577
d_name_len = strlen(dirst->d_name);
578
579
// Ignore dotfiles, backup files and other junk
580
{
581
bool bad_name = false;
582
583
const char const *bad_prefixes[] = { ".", "#", NULL };
584
585
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
".dpkg-old",
587
".dpkg-divert", NULL };
588
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
size_t pre_len = strlen(*pre);
590
if((d_name_len >= pre_len)
591
and strncmp((dirst->d_name), *pre, pre_len) == 0){
592
if(debug){
593
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
594
" with bad prefix %s\n", dirst->d_name, *pre);
595
}
596
bad_name = true;
597
break;
598
}
599
}
600
601
if(bad_name){
602
continue;
603
}
604
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
size_t suf_len = strlen(*suf);
607
if((d_name_len >= suf_len)
608
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
609
== 0)){
610
if(debug){
611
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
612
" with bad suffix %s\n", dirst->d_name, *suf);
613
}
614
bad_name = true;
615
break;
616
}
617
}
618
619
if(bad_name){
620
continue;
621
}
622
}
623
624
char *filename;
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
626
if(ret < 0){
627
perror("asprintf");
628
continue;
629
}
630
631
ret = stat(filename, &st);
632
if (ret == -1){
633
perror("stat");
634
free(filename);
635
continue;
636
}
637
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
904
/* Read and execute any executable in the plugin directory*/
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
911
continue;
912
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
914
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
918
continue;
919
}
920
921
/* Ignore non-executable files */
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
639
925
if(debug){
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
" with bad type or mode\n", filename);
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
642
930
}
643
free(filename);
931
close(plugin_fd);
932
free(direntries[i]);
644
933
continue;
645
934
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
935
936
plugin *p = getplugin(direntries[i]->d_name);
647
937
if(p == NULL){
648
perror("getplugin");
649
free(filename);
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
650
941
continue;
651
942
}
652
943
if(p->disabled){
653
944
if(debug){
654
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
655
dirst->d_name);
946
direntries[i]->d_name);
656
947
}
657
free(filename);
948
close(plugin_fd);
949
free(direntries[i]);
658
950
continue;
659
951
}
660
952
{
661
953
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
954
plugin *g = getplugin(NULL);
663
955
if(g != NULL){
664
956
for(char **a = g->argv + 1; *a != NULL; a++){
665
957
if(not add_argument(p, *a)){
666
perror("add_argument");
958
error(0, errno, "add_argument");
667
959
}
668
960
}
669
961
/* Add global environment variables */
670
962
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
672
perror("add_environment");
963
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
673
965
}
674
966
}
675
967
}
676
968
}
677
/* If this plugin has any environment variables, we will call
678
using execve and need to duplicate the environment from this
679
process, too. */
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
680
971
if(p->environ[0] != NULL){
681
972
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
688
perror("add_environment");
973
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
689
975
}
690
976
}
691
977
}
692
978
693
979
int pipefd[2];
694
ret = pipe(pipefd);
695
if (ret == -1){
696
perror("pipe");
697
exitstatus = EXIT_FAILURE;
698
goto fallback;
699
}
980
#ifndef O_CLOEXEC
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
985
if(ret == -1){
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
1001
/* Ask OS to automatic close the pipe on exec */
700
1002
ret = set_cloexec_flag(pipefd[0]);
701
1003
if(ret < 0){
702
perror("set_cloexec_flag");
703
exitstatus = EXIT_FAILURE;
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
704
1009
goto fallback;
705
1010
}
706
1011
ret = set_cloexec_flag(pipefd[1]);
707
1012
if(ret < 0){
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
710
1018
goto fallback;
711
1019
}
1020
#endif /* not O_CLOEXEC */
712
1021
/* Block SIGCHLD until process is safely in process list */
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
1024
NULL));
714
1025
if(ret < 0){
715
perror("sigprocmask");
716
exitstatus = EXIT_FAILURE;
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
717
1029
goto fallback;
718
1030
}
719
// Starting a new process to be watched
720
pid_t pid = fork();
1031
/* Starting a new process to be watched */
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
721
1036
if(pid == -1){
722
perror("fork");
723
exitstatus = EXIT_FAILURE;
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
724
1044
goto fallback;
725
1045
}
726
1046
if(pid == 0){
727
1047
/* this is the child process */
728
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
729
1049
if(ret < 0){
730
perror("sigaction");
731
_exit(EXIT_FAILURE);
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
732
1052
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
1054
if(ret < 0){
735
perror("sigprocmask");
736
_exit(EXIT_FAILURE);
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
737
1057
}
738
1058
739
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
1060
if(ret == -1){
741
perror("dup2");
742
_exit(EXIT_FAILURE);
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
743
1063
}
744
1064
745
if(dirfd(dir) < 0){
746
/* If dir has no file descriptor, we could not set FD_CLOEXEC
747
above and must now close it manually here. */
748
closedir(dir);
749
}
750
if(p->environ[0] == NULL){
751
if(execv(filename, p->argv) < 0){
752
perror("execv");
753
_exit(EXIT_FAILURE);
754
}
755
} else {
756
if(execve(filename, p->argv, p->environ) < 0){
757
perror("execve");
758
_exit(EXIT_FAILURE);
759
}
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
760
1071
}
761
1072
/* no return */
762
1073
}
763
/* parent process */
764
free(filename);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1074
/* Parent process */
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
NULL)));
770
1083
if(ret < 0){
771
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
772
1085
}
773
exitstatus = EXIT_FAILURE;
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
774
1088
goto fallback;
775
1089
}
776
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
1090
free(direntries[i]);
1091
1092
new_plugin->pid = pid;
1093
new_plugin->fd = pipefd[0];
1094
782
1095
/* Unblock SIGCHLD so signal handler can be run if this process
783
1096
has already completed */
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
785
1100
if(ret < 0){
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
788
1103
goto fallback;
789
1104
}
790
1105
791
FD_SET(new_process->fd, &rfds_all);
792
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
795
}
796
797
}
798
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
closedir(dir);
803
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
809
}
810
while(process_list){
1106
FD_SET(new_plugin->fd, &rfds_all);
1107
1108
if(maxfd < new_plugin->fd){
1109
maxfd = new_plugin->fd;
1110
}
1111
}
1112
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
1118
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
1120
if(p->pid != 0){
1121
break;
1122
}
1123
if(p->next == NULL){
1124
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1125
" directory?\n");
1126
free_plugin_list();
1127
}
1128
}
1129
1130
/* Main loop while running plugins exist */
1131
while(plugin_list){
811
1132
fd_set rfds = rfds_all;
812
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
if (select_ret == -1){
814
perror("select");
815
exitstatus = EXIT_FAILURE;
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
816
1137
goto fallback;
817
1138
}
818
1139
/* OK, now either a process completed, or something can be read
819
1140
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
1141
for(plugin *proc = plugin_list; proc != NULL;){
821
1142
/* Is this process completely done? */
822
if(proc->eof and proc->completed){
1143
if(proc->completed and proc->eof){
823
1144
/* Only accept the plugin output if it exited cleanly */
824
1145
if(not WIFEXITED(proc->status)
825
1146
or WEXITSTATUS(proc->status) != 0){
826
1147
/* Bad exit by plugin */
1148
827
1149
if(debug){
828
1150
if(WIFEXITED(proc->status)){
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
831
1154
WEXITSTATUS(proc->status));
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
835
WTERMSIG(proc->status));
836
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
839
1161
}
840
1162
}
1163
841
1164
/* Remove the plugin */
842
1165
FD_CLR(proc->fd, &rfds_all);
1166
843
1167
/* Block signal while modifying process_list */
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
845
1172
if(ret < 0){
846
perror("sigprocmask");
847
exitstatus = EXIT_FAILURE;
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
848
1175
goto fallback;
849
1176
}
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
1177
1178
plugin *next_plugin = proc->next;
1179
free_plugin(proc);
1180
proc = next_plugin;
1181
863
1182
/* We are done modifying process list, so unblock signal */
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
866
1186
if(ret < 0){
867
perror("sigprocmask");
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1189
goto fallback;
1190
}
1191
1192
if(plugin_list == NULL){
1193
break;
1194
}
1195
1196
continue;
875
1197
}
1198
876
1199
/* This process exited nicely, so print its buffer */
877
1200
878
1201
bool bret = print_out_password(proc->buffer,
879
1202
proc->buffer_length);
880
1203
if(not bret){
881
perror("print_out_password");
882
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
883
1206
}
884
1207
goto fallback;
885
1208
}
1209
886
1210
/* This process has not completed. Does it have any output? */
887
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
888
1212
/* This process had nothing to say at this time */
1213
proc = proc->next;
889
1214
continue;
890
1215
}
891
1216
/* Before reading, make the process' data buffer large enough */
892
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
893
proc->buffer = realloc(proc->buffer, proc->buffer_size
894
+ (size_t) BUFFER_SIZE);
895
if (proc->buffer == NULL){
896
perror("malloc");
897
exitstatus = EXIT_FAILURE;
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
898
1223
goto fallback;
899
1224
}
1225
proc->buffer = new_buffer;
900
1226
proc->buffer_size += BUFFER_SIZE;
901
1227
}
902
1228
/* Read from the process */
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1233
if(sret < 0){
906
1234
/* Read error from this process; ignore the error */
1235
proc = proc->next;
907
1236
continue;
908
1237
}
909
if(ret == 0){
1238
if(sret == 0){
910
1239
/* got EOF */
911
1240
proc->eof = true;
912
1241
} else {
913
proc->buffer_length += (size_t) ret;
1242
proc->buffer_length += (size_t) sret;
914
1243
}
915
1244
}
916
1245
}
917
918
1246
1247
919
1248
fallback:
920
1249
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
922
1252
/* Fallback if all plugins failed, none are found or an error
923
1253
occured */
924
1254
bool bret;
925
1255
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1256
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1257
size_t len = strlen(passwordbuffer);
1258
/* Strip trailing newline */
1259
if(len > 0 and passwordbuffer[len-1] == '\n'){
1260
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1261
len--;
1262
}
1263
bret = print_out_password(passwordbuffer, len);
928
1264
if(not bret){
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
931
1267
}
932
1268
}
933
1269
934
1270
/* Restore old signal handler */
935
1271
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
936
1272
if(ret == -1){
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
939
1275
}
940
1276
941
1277
if(custom_argv != NULL){
942
1278
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1279
free(*arg);
944
1280
}
945
1281
free(custom_argv);
946
1282
}
947
free_plugin_list(plugin_list);
948
949
if(dir != NULL){
950
closedir(dir);
1283
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
951
1288
}
952
1289
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1290
/* Kill the processes */
1291
for(plugin *p = plugin_list; p != NULL; p = p->next){
1292
if(p->pid != 0){
1293
close(p->fd);
1294
ret = kill(p->pid, SIGTERM);
1295
if(ret == -1 and errno != ESRCH){
1296
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1298
}
961
1299
}
962
free(process_list->buffer);
963
free(process_list);
964
1300
}
965
1301
966
1302
/* Wait for any remaining child processes to terminate */
967
do{
1303
do {
968
1304
ret = wait(NULL);
969
1305
} while(ret >= 0);
970
1306
if(errno != ECHILD){
971
perror("wait");
1307
error(0, errno, "wait");
972
1308
}
973
1309
1310
free_plugin_list();
1311
1312
free(plugindir);
1313
free(pluginhelperdir);
1314
free(argfile);
1315
974
1316
return exitstatus;
975
1317
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0