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- Committer: Teddy Hogeborn
- Date: 2016-03-04 20:50:45 UTC
- Revision ID: teddy@recompile.se-20160304205045-jksfb2qzv9erkf21
Only use -fsanitize=... options if they work.
* Makefile (ALL_SANITIZE_OPTIONS): New.
(SANITIZE): Loop through all known sanitizing options and only use
those which do not give an error.
* Makefile (ALL_SANITIZE_OPTIONS): New.
(SANITIZE): Loop through all known sanitizing options and only use
those which do not give an error.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
58
60
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
60
63
#include <signal.h> /* struct sigaction, sigemptyset(),
61
64
sigaddset(), sigaction(),
62
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
65
75
66
76
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
85
84
86
85
typedef struct plugin{
87
86
char *name; /* can be NULL or any plugin name */
90
89
char **environ;
91
90
int envc;
92
91
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;
93
102
struct plugin *next;
94
103
} plugin;
95
104
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
100
115
return p;
101
116
}
102
117
}
103
118
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
106
124
return NULL;
107
125
}
108
126
char *copy_name = NULL;
109
127
if(name != NULL){
110
copy_name = strdup(name);
111
}
112
if(copy_name == NULL){
113
return NULL;
114
}
115
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
121
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
return NULL;
136
}
137
}
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
124
149
free(copy_name);
125
150
free(new_plugin);
151
errno = e;
126
152
return NULL;
127
153
}
128
154
new_plugin->argv[0] = copy_name;
129
155
new_plugin->argv[1] = NULL;
130
131
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
132
160
if(new_plugin->environ == NULL){
161
int e = errno;
133
162
free(copy_name);
134
163
free(new_plugin->argv);
135
164
free(new_plugin);
165
errno = e;
136
166
return NULL;
137
167
}
138
168
new_plugin->environ[0] = NULL;
169
139
170
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
141
172
return new_plugin;
142
173
}
143
174
144
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
145
177
static bool add_to_char_array(const char *new, char ***array,
146
178
int *len){
147
179
/* Resize the pointed-to array to hold one more pointer */
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
150
185
/* Malloc check */
151
if(*array == NULL){
186
if(new_array == NULL){
152
187
return false;
153
188
}
189
*array = new_array;
154
190
/* Make a copy of the new string */
155
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
156
195
if(copy == NULL){
157
196
return false;
158
197
}
165
204
}
166
205
167
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
168
208
static bool add_argument(plugin *p, const char *arg){
169
209
if(p == NULL){
170
210
return false;
173
213
}
174
214
175
215
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
177
218
if(p == NULL){
178
219
return false;
179
220
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
180
241
return add_to_char_array(def, &(p->environ), &(p->envc));
181
242
}
182
243
183
244
#ifndef O_CLOEXEC
184
245
/*
185
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
247
* Descriptor Flags".
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
249
*/
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
253
/* If reading the flags failed, return error indication now. */
193
254
if(ret < 0){
194
255
return ret;
195
256
}
196
257
/* Store modified flag word in the descriptor. */
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
198
260
}
199
200
process *process_list = NULL;
201
202
/* Mark a process as completed when it exits, and save its exit
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
203
265
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
while(true){
269
plugin *proc = plugin_list;
270
int status;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
272
if(pid == 0){
273
/* Only still running child processes */
274
break;
275
}
276
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
280
}
281
error(0, errno, "waitpid");
282
}
283
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
286
proc = proc->next;
287
}
288
if(proc == NULL){
289
/* Process not found in process list */
290
continue;
291
}
292
proc->status = status;
293
proc->completed = 1;
294
}
295
errno = old_errno;
221
296
}
222
297
223
bool print_out_password(const char *buffer, size_t length){
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
224
301
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
228
302
for(size_t written = 0; written < length; written += (size_t)ret){
229
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
304
length - written));
235
309
return true;
236
310
}
237
311
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
static void free_plugin(plugin *plugin_node){
315
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->argv);
320
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(*env);
322
}
323
free(plugin_node->environ);
324
free(plugin_node->buffer);
325
326
/* Removes the plugin from the singly-linked list */
327
if(plugin_node == plugin_list){
328
/* First one - simple */
329
plugin_list = plugin_list->next;
330
} else {
331
/* Second one or later */
332
for(plugin *p = plugin_list; p != NULL; p = p->next){
333
if(p->next == plugin_node){
334
p->next = plugin_node->next;
335
break;
336
}
244
337
}
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
338
}
339
340
free(plugin_node);
257
341
}
258
342
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
free(plugin_list->name);
263
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
264
free(*arg);
265
}
266
free(plugin_list->argv);
267
for(char **env = plugin_list->environ; *env != NULL; env++){
268
free(*env);
269
}
270
free(plugin_list->environ);
271
free(plugin_list);
272
}
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
346
}
273
347
}
274
348
275
349
int main(int argc, char *argv[]){
276
const char *plugindir = "/lib/mandos/plugins.d";
277
const char *argfile = ARGFILE;
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
278
353
FILE *conffp;
279
size_t d_name_len;
280
DIR *dir = NULL;
281
struct dirent *dirst;
354
struct dirent **direntries = NULL;
282
355
struct stat st;
283
356
fd_set rfds_all;
284
357
int ret, maxfd = 0;
358
ssize_t sret;
285
359
uid_t uid = 65534;
286
360
gid_t gid = 65534;
287
361
bool debug = false;
291
365
.sa_flags = SA_NOCLDSTOP };
292
366
char **custom_argv = NULL;
293
367
int custom_argc = 0;
368
int dir_fd = -1;
294
369
295
370
/* Establish a signal handler */
296
371
sigemptyset(&sigchld_action.sa_mask);
297
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
298
373
if(ret == -1){
299
perror("sigaddset");
300
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
301
376
goto fallback;
302
377
}
303
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
304
379
if(ret == -1){
305
perror("sigaction");
306
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
307
382
goto fallback;
308
383
}
309
384
312
387
{ .name = "global-options", .key = 'g',
313
388
.arg = "OPTION[,OPTION[,...]]",
314
389
.doc = "Options passed to all plugins" },
315
{ .name = "global-envs", .key = 'e',
390
{ .name = "global-env", .key = 'G',
316
391
.arg = "VAR=value",
317
392
.doc = "Environment variable passed to all plugins" },
318
393
{ .name = "options-for", .key = 'o',
319
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
320
395
.doc = "Options passed only to specified plugin" },
321
{ .name = "envs-for", .key = 'f',
396
{ .name = "env-for", .key = 'E',
322
397
.arg = "PLUGIN:ENV=value",
323
398
.doc = "Environment variable passed to specified plugin" },
324
399
{ .name = "disable", .key = 'd',
325
400
.arg = "PLUGIN",
326
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
327
405
{ .name = "plugin-dir", .key = 128,
328
406
.arg = "DIRECTORY",
329
407
.doc = "Specify a different plugin directory", .group = 2 },
330
{ .name = "userid", .key = 129,
331
.arg = "ID", .flags = 0,
332
.doc = "User ID the plugins will run as", .group = 2 },
333
{ .name = "groupid", .key = 130,
334
.arg = "ID", .flags = 0,
335
.doc = "Group ID the plugins will run as", .group = 2 },
336
{ .name = "debug", .key = 131,
337
.doc = "Debug mode", .group = 3 },
408
{ .name = "config-file", .key = 129,
409
.arg = "FILE",
410
.doc = "Specify a different configuration file", .group = 2 },
411
{ .name = "userid", .key = 130,
412
.arg = "ID", .flags = 0,
413
.doc = "User ID the plugins will run as", .group = 3 },
414
{ .name = "groupid", .key = 131,
415
.arg = "ID", .flags = 0,
416
.doc = "Group ID the plugins will run as", .group = 3 },
417
{ .name = "debug", .key = 132,
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
338
432
{ .name = NULL }
339
433
};
340
434
341
error_t parse_opt (int key, char *arg, struct argp_state *state) {
342
/* Get the INPUT argument from `argp_parse', which we know is a
343
pointer to our plugin list pointer. */
344
plugin **plugins = state->input;
345
switch (key) {
346
case 'g':
347
if (arg != NULL){
348
char *p;
349
while((p = strsep(&arg, ",")) != NULL){
350
if(p[0] == '\0'){
351
continue;
352
}
353
if(not add_argument(getplugin(NULL, plugins), p)){
354
perror("add_argument");
355
return ARGP_ERR_UNKNOWN;
356
}
357
}
358
}
359
break;
360
case 'e':
361
if(arg == NULL){
362
break;
363
}
364
{
365
char *envdef = strdup(arg);
366
if(envdef == NULL){
367
break;
368
}
369
if(not add_environment(getplugin(NULL, plugins), envdef)){
370
perror("add_environment");
371
}
372
}
373
break;
374
case 'o':
375
if (arg != NULL){
376
char *p_name = strsep(&arg, ":");
377
if(p_name[0] == '\0'){
378
break;
379
}
380
char *opt = strsep(&arg, ":");
381
if(opt[0] == '\0'){
382
break;
383
}
384
if(opt != NULL){
385
char *p;
386
while((p = strsep(&opt, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(p_name, plugins), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
393
}
394
}
395
}
396
}
397
break;
398
case 'f':
399
if(arg == NULL){
400
break;
401
}
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 */
402
482
{
403
483
char *envdef = strchr(arg, ':');
404
484
if(envdef == NULL){
405
break;
406
}
407
char *p_name = strndup(arg, (size_t) (envdef-arg));
408
if(p_name == NULL){
409
break;
410
}
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
411
490
envdef++;
412
if(not add_environment(getplugin(p_name, plugins), envdef)){
413
perror("add_environment");
414
}
415
}
416
break;
417
case 'd':
418
if (arg != NULL){
419
plugin *p = getplugin(arg, plugins);
420
if(p == NULL){
421
return ARGP_ERR_UNKNOWN;
422
}
423
p->disabled = true;
424
}
425
break;
426
case 128:
427
plugindir = arg;
428
break;
429
case 129:
430
uid = (uid_t)strtol(arg, NULL, 10);
431
break;
432
case 130:
433
gid = (gid_t)strtol(arg, NULL, 10);
434
break;
435
case 131:
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
499
}
500
break;
501
case 'd': /* --disable */
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
517
}
518
break;
519
case 128: /* --plugin-dir */
520
free(plugindir);
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
break;
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
break;
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
break;
551
case 132: /* --debug */
436
552
debug = true;
437
553
break;
438
case ARGP_KEY_ARG:
439
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
440
break;
441
case ARGP_KEY_END:
442
break;
443
default:
444
return ARGP_ERR_UNKNOWN;
445
}
446
return 0;
447
}
448
449
plugin *plugin_list = NULL;
450
451
struct argp argp = { .options = options, .parser = parse_opt,
452
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
default:
587
return ARGP_ERR_UNKNOWN;
588
}
589
return errno; /* Set to 0 at start */
590
}
591
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
606
break;
607
case 129: /* --config-file */
608
free(argfile);
609
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
612
}
613
break;
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
case ARGP_KEY_ARG:
622
break;
623
default:
624
return ARGP_ERR_UNKNOWN;
625
}
626
return errno;
627
}
628
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
453
632
.doc = "Mandos plugin runner -- Run plugins" };
454
633
455
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
456
if (ret == ARGP_ERR_UNKNOWN){
457
fprintf(stderr, "Unknown error while parsing arguments\n");
458
exitstatus = EXIT_FAILURE;
459
goto fallback;
460
}
461
462
conffp = fopen(argfile, "r");
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
650
goto fallback;
651
}
652
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
655
656
/* Open the configfile if available */
657
if(argfile == NULL){
658
conffp = fopen(AFILE, "r");
659
} else {
660
conffp = fopen(argfile, "r");
661
}
463
662
if(conffp != NULL){
464
663
char *org_line = NULL;
465
664
char *p, *arg, *new_arg, *line;
466
665
size_t size = 0;
467
ssize_t sret;
468
666
const char whitespace_delims[] = " \r\t\f\v\n";
469
667
const char comment_delim[] = "#";
470
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 */
471
681
while(true){
472
682
sret = getline(&org_line, &size, conffp);
473
683
if(sret == -1){
474
684
break;
475
685
}
476
686
477
687
line = org_line;
478
688
arg = strsep(&line, comment_delim);
479
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
481
691
continue;
482
692
}
483
693
new_arg = strdup(p);
484
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
485
if (custom_argv == NULL){
486
perror("add_to_argv");
487
exitstatus = EXIT_FAILURE;
694
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
697
free(org_line);
488
698
goto fallback;
489
699
}
700
701
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
714
}
715
custom_argv[custom_argc-1] = new_arg;
716
custom_argv[custom_argc] = NULL;
490
717
}
491
718
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
492
727
free(org_line);
493
} else{
728
} else {
494
729
/* Check for harmful errors and go to fallback. Other errors might
495
730
not affect opening plugins */
496
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
497
perror("fopen");
498
exitstatus = EXIT_FAILURE;
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
499
734
goto fallback;
500
735
}
501
736
}
502
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
503
739
if(custom_argv != NULL){
504
custom_argv[0] = argv[0];
505
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
506
if (ret == ARGP_ERR_UNKNOWN){
507
fprintf(stderr, "Unknown error while parsing arguments\n");
508
exitstatus = EXIT_FAILURE;
509
goto fallback;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
754
goto fallback;
755
}
756
}
757
758
/* Parse actual command line arguments, to let them override the
759
config file */
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
510
792
}
511
793
}
512
794
517
799
for(char **a = p->argv; *a != NULL; a++){
518
800
fprintf(stderr, "\tArg: %s\n", *a);
519
801
}
520
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
521
803
for(char **a = p->environ; *a != NULL; a++){
522
804
fprintf(stderr, "\t%s\n", *a);
523
805
}
524
806
}
525
807
}
526
808
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
527
838
ret = setuid(uid);
528
if (ret == -1){
529
perror("setuid");
530
}
531
532
setgid(gid);
533
if (ret == -1){
534
perror("setgid");
535
}
536
537
dir = opendir(plugindir);
538
if(dir == NULL){
539
perror("Could not open plugin dir");
540
exitstatus = EXIT_FAILURE;
541
goto fallback;
542
}
543
544
/* Set the FD_CLOEXEC flag on the directory, if possible */
839
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
545
844
{
546
int dir_fd = dirfd(dir);
547
if(dir_fd >= 0){
548
ret = set_cloexec_flag(dir_fd);
549
if(ret < 0){
550
perror("set_cloexec_flag");
551
exitstatus = EXIT_FAILURE;
552
goto fallback;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
553
889
}
554
890
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
555
901
}
556
902
557
903
FD_ZERO(&rfds_all);
558
904
559
while(true){
560
dirst = readdir(dir);
561
562
// All directory entries have been processed
563
if(dirst == NULL){
564
if (errno == EBADF){
565
perror("readdir");
566
exitstatus = EXIT_FAILURE;
567
goto fallback;
568
}
569
break;
570
}
571
572
d_name_len = strlen(dirst->d_name);
573
574
// Ignore dotfiles, backup files and other junk
575
{
576
bool bad_name = false;
577
578
const char const *bad_prefixes[] = { ".", "#", NULL };
579
580
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
581
".dpkg-old",
582
".dpkg-divert", NULL };
583
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
584
size_t pre_len = strlen(*pre);
585
if((d_name_len >= pre_len)
586
and strncmp((dirst->d_name), *pre, pre_len) == 0){
587
if(debug){
588
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
589
" with bad prefix %s\n", dirst->d_name, *pre);
590
}
591
bad_name = true;
592
break;
593
}
594
}
595
596
if(bad_name){
597
continue;
598
}
599
600
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
601
size_t suf_len = strlen(*suf);
602
if((d_name_len >= suf_len)
603
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
604
== 0)){
605
if(debug){
606
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
607
" with bad suffix %s\n", dirst->d_name, *suf);
608
}
609
bad_name = true;
610
break;
611
}
612
}
613
614
if(bad_name){
615
continue;
616
}
617
}
618
619
char *filename;
620
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
621
if(ret < 0){
622
perror("asprintf");
623
continue;
624
}
625
626
ret = stat(filename, &st);
627
if (ret == -1){
628
perror("stat");
629
free(filename);
630
continue;
631
}
632
633
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
905
/* Read and execute any executable in the plugin directory*/
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
912
continue;
913
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
919
continue;
920
}
921
922
/* Ignore non-executable files */
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
634
926
if(debug){
635
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
636
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
637
931
}
638
free(filename);
932
close(plugin_fd);
933
free(direntries[i]);
639
934
continue;
640
935
}
641
plugin *p = getplugin(dirst->d_name, &plugin_list);
936
937
plugin *p = getplugin(direntries[i]->d_name);
642
938
if(p == NULL){
643
perror("getplugin");
644
free(filename);
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
645
942
continue;
646
943
}
647
944
if(p->disabled){
648
945
if(debug){
649
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
650
dirst->d_name);
947
direntries[i]->d_name);
651
948
}
652
free(filename);
949
close(plugin_fd);
950
free(direntries[i]);
653
951
continue;
654
952
}
655
953
{
656
954
/* Add global arguments to argument list for this plugin */
657
plugin *g = getplugin(NULL, &plugin_list);
955
plugin *g = getplugin(NULL);
658
956
if(g != NULL){
659
957
for(char **a = g->argv + 1; *a != NULL; a++){
660
958
if(not add_argument(p, *a)){
661
perror("add_argument");
959
error(0, errno, "add_argument");
662
960
}
663
961
}
664
962
/* Add global environment variables */
665
963
for(char **e = g->environ; *e != NULL; e++){
666
if(not add_environment(p, *e)){
667
perror("add_environment");
964
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
668
966
}
669
967
}
670
968
}
671
969
}
672
/* If this plugin has any environment variables, we will call
673
using execve and need to duplicate the environment from this
674
process, too. */
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
675
972
if(p->environ[0] != NULL){
676
973
for(char **e = environ; *e != NULL; e++){
677
char *copy = strdup(*e);
678
if(copy == NULL){
679
perror("strdup");
680
continue;
681
}
682
if(not add_environment(p, copy)){
683
perror("add_environment");
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
684
976
}
685
977
}
686
978
}
687
979
688
int pipefd[2];
689
ret = pipe(pipefd);
690
if (ret == -1){
691
perror("pipe");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
980
int pipefd[2];
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
986
if(ret == -1){
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
1002
/* Ask OS to automatic close the pipe on exec */
695
1003
ret = set_cloexec_flag(pipefd[0]);
696
1004
if(ret < 0){
697
perror("set_cloexec_flag");
698
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
699
1010
goto fallback;
700
1011
}
701
1012
ret = set_cloexec_flag(pipefd[1]);
702
1013
if(ret < 0){
703
perror("set_cloexec_flag");
704
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
705
1019
goto fallback;
706
1020
}
1021
#endif /* not O_CLOEXEC */
707
1022
/* Block SIGCHLD until process is safely in process list */
708
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
709
1026
if(ret < 0){
710
perror("sigprocmask");
711
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
712
1030
goto fallback;
713
1031
}
714
// Starting a new process to be watched
715
pid_t pid = fork();
1032
/* Starting a new process to be watched */
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
716
1037
if(pid == -1){
717
perror("fork");
718
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
719
1045
goto fallback;
720
1046
}
721
1047
if(pid == 0){
722
1048
/* this is the child process */
723
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
724
1050
if(ret < 0){
725
perror("sigaction");
726
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
727
1053
}
728
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
729
1055
if(ret < 0){
730
perror("sigprocmask");
731
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
732
1058
}
733
1059
734
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
735
1061
if(ret == -1){
736
perror("dup2");
737
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
738
1064
}
739
1065
740
if(dirfd(dir) < 0){
741
/* If dir has no file descriptor, we could not set FD_CLOEXEC
742
above and must now close it manually here. */
743
closedir(dir);
744
}
745
if(p->environ[0] == NULL){
746
if(execv(filename, p->argv) < 0){
747
perror("execv");
748
_exit(EXIT_FAILURE);
749
}
750
} else {
751
if(execve(filename, p->argv, p->environ) < 0){
752
perror("execve");
753
_exit(EXIT_FAILURE);
754
}
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
755
1072
}
756
1073
/* no return */
757
1074
}
758
/* parent process */
759
free(filename);
760
close(pipefd[1]); /* close unused write end of pipe */
761
process *new_process = malloc(sizeof(process));
762
if (new_process == NULL){
763
perror("malloc");
764
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1075
/* Parent process */
1076
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
765
1084
if(ret < 0){
766
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
767
1086
}
768
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
769
1089
goto fallback;
770
1090
}
771
772
*new_process = (struct process){ .pid = pid,
773
.fd = pipefd[0],
774
.next = process_list };
775
// List handling
776
process_list = new_process;
1091
free(direntries[i]);
1092
1093
new_plugin->pid = pid;
1094
new_plugin->fd = pipefd[0];
1095
777
1096
/* Unblock SIGCHLD so signal handler can be run if this process
778
1097
has already completed */
779
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
780
1101
if(ret < 0){
781
perror("sigprocmask");
782
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
783
1104
goto fallback;
784
1105
}
785
1106
786
FD_SET(new_process->fd, &rfds_all);
787
788
if (maxfd < new_process->fd){
789
maxfd = new_process->fd;
790
}
791
792
}
793
794
free_plugin_list(plugin_list);
795
796
closedir(dir);
797
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
803
}
804
while(process_list){
1107
FD_SET(new_plugin->fd, &rfds_all);
1108
1109
if(maxfd < new_plugin->fd){
1110
maxfd = new_plugin->fd;
1111
}
1112
}
1113
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
1119
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
1121
if(p->pid != 0){
1122
break;
1123
}
1124
if(p->next == NULL){
1125
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1126
" directory?\n");
1127
free_plugin_list();
1128
}
1129
}
1130
1131
/* Main loop while running plugins exist */
1132
while(plugin_list){
805
1133
fd_set rfds = rfds_all;
806
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
if (select_ret == -1){
808
perror("select");
809
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
810
1138
goto fallback;
811
1139
}
812
1140
/* OK, now either a process completed, or something can be read
813
1141
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
1142
for(plugin *proc = plugin_list; proc != NULL;){
815
1143
/* Is this process completely done? */
816
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
817
1145
/* Only accept the plugin output if it exited cleanly */
818
1146
if(not WIFEXITED(proc->status)
819
1147
or WEXITSTATUS(proc->status) != 0){
820
1148
/* Bad exit by plugin */
1149
821
1150
if(debug){
822
1151
if(WIFEXITED(proc->status)){
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
825
1155
WEXITSTATUS(proc->status));
826
} else if(WIFSIGNALED(proc->status)) {
827
fprintf(stderr, "Plugin %u killed by signal %d\n",
828
(unsigned int) (proc->pid),
829
WTERMSIG(proc->status));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
830
1162
} else if(WCOREDUMP(proc->status)){
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1164
" core\n", proc->name, (intmax_t) (proc->pid));
833
1165
}
834
1166
}
1167
835
1168
/* Remove the plugin */
836
1169
FD_CLR(proc->fd, &rfds_all);
1170
837
1171
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
(SIG_BLOCK,
1174
&sigchld_action.sa_mask,
1175
NULL));
839
1176
if(ret < 0){
840
perror("sigprocmask");
841
exitstatus = EXIT_FAILURE;
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
842
1179
goto fallback;
843
1180
}
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
1181
1182
plugin *next_plugin = proc->next;
1183
free_plugin(proc);
1184
proc = next_plugin;
1185
857
1186
/* We are done modifying process list, so unblock signal */
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1187
ret = (int)(TEMP_FAILURE_RETRY
1188
(sigprocmask(SIG_UNBLOCK,
1189
&sigchld_action.sa_mask, NULL)));
860
1190
if(ret < 0){
861
perror("sigprocmask");
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
1193
goto fallback;
1194
}
1195
1196
if(plugin_list == NULL){
1197
break;
1198
}
1199
1200
continue;
869
1201
}
1202
870
1203
/* This process exited nicely, so print its buffer */
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1204
1205
bool bret = print_out_password(proc->buffer,
1206
proc->buffer_length);
873
1207
if(not bret){
874
perror("print_out_password");
875
exitstatus = EXIT_FAILURE;
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
876
1210
}
877
1211
goto fallback;
878
1212
}
1213
879
1214
/* This process has not completed. Does it have any output? */
880
1215
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1216
/* This process had nothing to say at this time */
1217
proc = proc->next;
882
1218
continue;
883
1219
}
884
1220
/* Before reading, make the process' data buffer large enough */
885
1221
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
887
+ (size_t) BUFFER_SIZE);
888
if (proc->buffer == NULL){
889
perror("malloc");
890
exitstatus = EXIT_FAILURE;
1222
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1223
+ (size_t) BUFFER_SIZE);
1224
if(new_buffer == NULL){
1225
error(0, errno, "malloc");
1226
exitstatus = EX_OSERR;
891
1227
goto fallback;
892
1228
}
1229
proc->buffer = new_buffer;
893
1230
proc->buffer_size += BUFFER_SIZE;
894
1231
}
895
1232
/* Read from the process */
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1233
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1234
proc->buffer
1235
+ proc->buffer_length,
1236
BUFFER_SIZE));
1237
if(sret < 0){
899
1238
/* Read error from this process; ignore the error */
1239
proc = proc->next;
900
1240
continue;
901
1241
}
902
if(ret == 0){
1242
if(sret == 0){
903
1243
/* got EOF */
904
1244
proc->eof = true;
905
1245
} else {
906
proc->buffer_length += (size_t) ret;
1246
proc->buffer_length += (size_t) sret;
907
1247
}
908
1248
}
909
1249
}
910
911
1250
1251
912
1252
fallback:
913
1253
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
1256
/* Fallback if all plugins failed, none are found or an error
1257
occured */
916
1258
bool bret;
917
1259
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1260
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1261
size_t len = strlen(passwordbuffer);
1262
/* Strip trailing newline */
1263
if(len > 0 and passwordbuffer[len-1] == '\n'){
1264
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1265
len--;
1266
}
1267
bret = print_out_password(passwordbuffer, len);
920
1268
if(not bret){
921
perror("print_out_password");
922
exitstatus = EXIT_FAILURE;
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
923
1271
}
924
1272
}
925
1273
926
1274
/* Restore old signal handler */
927
1275
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
928
1276
if(ret == -1){
929
perror("sigaction");
930
exitstatus = EXIT_FAILURE;
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
931
1279
}
932
1280
933
1281
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1282
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1283
free(*arg);
936
1284
}
937
1285
free(custom_argv);
938
1286
}
939
free_plugin_list(plugin_list);
940
941
if(dir != NULL){
942
closedir(dir);
1287
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
943
1292
}
944
1293
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1294
/* Kill the processes */
1295
for(plugin *p = plugin_list; p != NULL; p = p->next){
1296
if(p->pid != 0){
1297
close(p->fd);
1298
ret = kill(p->pid, SIGTERM);
1299
if(ret == -1 and errno != ESRCH){
1300
/* Set-uid proccesses might not get closed */
1301
error(0, errno, "kill");
1302
}
953
1303
}
954
free(process_list->buffer);
955
free(process_list);
956
1304
}
957
1305
958
1306
/* Wait for any remaining child processes to terminate */
959
do{
1307
do {
960
1308
ret = wait(NULL);
961
1309
} while(ret >= 0);
962
1310
if(errno != ECHILD){
963
perror("wait");
1311
error(0, errno, "wait");
964
1312
}
965
1313
1314
free_plugin_list();
1315
1316
free(plugindir);
1317
free(pluginhelperdir);
1318
free(argfile);
1319
966
1320
return exitstatus;
967
1321
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0