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- Committer: Teddy Hogeborn
- Date: 2015-03-10 18:03:38 UTC
- mto: (237.7.304 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150310180338-pcxw6r2qmw9k6br9
Add ":!RSA" to GnuTLS priority string, to disallow non-DHE kx.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- network-protocol.txt
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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(), strcpy(),
55
strcat() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
59
60
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugins.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{
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
86
char **argv;
87
int argc;
88
char **environ;
89
int envc;
90
bool disabled;
91
92
/* Variables used for running processes*/
76
93
pid_t pid;
77
94
int fd;
78
95
char *buffer;
79
96
size_t buffer_size;
80
97
size_t buffer_length;
81
98
bool eof;
82
bool completed;
99
volatile sig_atomic_t completed;
83
100
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
92
101
struct plugin *next;
93
102
} plugin;
94
103
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
if ((p->name == name)
98
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))){
99
114
return p;
100
115
}
101
116
}
102
117
/* Create a new plugin */
103
plugin *new_plugin = malloc(sizeof(plugin));
104
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
109
new_plugin->argv = malloc(sizeof(char *) * 2);
110
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
113
}
114
new_plugin->argv[0] = name;
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){
123
return NULL;
124
}
125
char *copy_name = NULL;
126
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
return NULL;
135
}
136
}
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
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;
148
free(copy_name);
149
free(new_plugin);
150
errno = e;
151
return NULL;
152
}
153
new_plugin->argv[0] = copy_name;
115
154
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
159
if(new_plugin->environ == NULL){
160
int e = errno;
161
free(copy_name);
162
free(new_plugin->argv);
163
free(new_plugin);
164
errno = e;
165
return NULL;
166
}
167
new_plugin->environ[0] = NULL;
168
119
169
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
170
plugin_list = new_plugin;
121
171
return new_plugin;
122
172
}
123
173
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
p->argv[p->argc] = NULL;
133
}
134
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
static bool add_to_char_array(const char *new, char ***array,
177
int *len){
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
184
/* Malloc check */
185
if(new_array == NULL){
186
return false;
187
}
188
*array = new_array;
189
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
194
if(copy == NULL){
195
return false;
196
}
197
/* Insert the copy */
198
(*array)[*len] = copy;
199
(*len)++;
200
/* Add a new terminating NULL pointer to the last element */
201
(*array)[*len] = NULL;
202
return true;
203
}
204
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
static bool add_argument(plugin *p, const char *arg){
208
if(p == NULL){
209
return false;
210
}
211
return add_to_char_array(arg, &(p->argv), &(p->argc));
212
}
213
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
217
if(p == NULL){
218
return false;
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
}
240
return add_to_char_array(def, &(p->environ), &(p->envc));
241
}
242
243
#ifndef O_CLOEXEC
135
244
/*
136
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
137
246
* Descriptor Flags".
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
139
248
*/
140
static int set_cloexec_flag(int fd)
141
{
142
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));
143
252
/* If reading the flags failed, return error indication now. */
144
253
if(ret < 0){
145
254
return ret;
146
255
}
147
256
/* Store modified flag word in the descriptor. */
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
149
259
}
150
151
process *process_list = NULL;
152
153
/* Mark a process as completed when it exits, and save its exit
260
#endif /* not O_CLOEXEC */
261
262
263
/* Mark processes as completed when they exit, and save their exit
154
264
status. */
155
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
proc->completed = true;
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
267
while(true){
268
plugin *proc = plugin_list;
269
int status;
270
pid_t pid = waitpid(-1, &status, WNOHANG);
271
if(pid == 0){
272
/* Only still running child processes */
273
break;
274
}
275
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
279
}
280
error(0, errno, "waitpid");
281
}
282
283
/* A child exited, find it in process_list */
284
while(proc != NULL and proc->pid != pid){
285
proc = proc->next;
286
}
287
if(proc == NULL){
288
/* Process not found in process list */
289
continue;
290
}
291
proc->status = status;
292
proc->completed = 1;
293
}
294
errno = old_errno;
172
295
}
173
296
174
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){
175
300
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
179
301
for(size_t written = 0; written < length; written += (size_t)ret){
180
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
303
length - written));
186
308
return true;
187
309
}
188
310
189
char ** addcustomargument(char **argv, int *argc, char *arg){
190
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
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
}
196
336
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
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);
345
}
209
346
}
210
347
211
348
int main(int argc, char *argv[]){
212
const char *plugindir = "/lib/mandos/plugins.d";
213
const char *argfile = ARGFILE;
349
char *plugindir = NULL;
350
char *argfile = NULL;
214
351
FILE *conffp;
215
size_t d_name_len;
216
DIR *dir = NULL;
217
struct dirent *dirst;
352
struct dirent **direntries = NULL;
218
353
struct stat st;
219
354
fd_set rfds_all;
220
355
int ret, maxfd = 0;
356
ssize_t sret;
221
357
uid_t uid = 65534;
222
358
gid_t gid = 65534;
223
359
bool debug = false;
227
363
.sa_flags = SA_NOCLDSTOP };
228
364
char **custom_argv = NULL;
229
365
int custom_argc = 0;
366
int dir_fd = -1;
230
367
231
368
/* Establish a signal handler */
232
369
sigemptyset(&sigchld_action.sa_mask);
233
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
235
perror("sigaddset");
236
exit(EXIT_FAILURE);
371
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
374
goto fallback;
237
375
}
238
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
240
perror("sigaction");
241
exit(EXIT_FAILURE);
377
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
380
goto fallback;
242
381
}
243
382
244
383
/* The options we understand. */
246
385
{ .name = "global-options", .key = 'g',
247
386
.arg = "OPTION[,OPTION[,...]]",
248
387
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
389
.arg = "VAR=value",
390
.doc = "Environment variable passed to all plugins" },
249
391
{ .name = "options-for", .key = 'o',
250
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
393
.doc = "Options passed only to specified plugin" },
394
{ .name = "env-for", .key = 'E',
395
.arg = "PLUGIN:ENV=value",
396
.doc = "Environment variable passed to specified plugin" },
252
397
{ .name = "disable", .key = 'd',
253
398
.arg = "PLUGIN",
254
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
255
403
{ .name = "plugin-dir", .key = 128,
256
404
.arg = "DIRECTORY",
257
405
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
406
{ .name = "config-file", .key = 129,
407
.arg = "FILE",
408
.doc = "Specify a different configuration file", .group = 2 },
409
{ .name = "userid", .key = 130,
410
.arg = "ID", .flags = 0,
411
.doc = "User ID the plugins will run as", .group = 3 },
412
{ .name = "groupid", .key = 131,
413
.arg = "ID", .flags = 0,
414
.doc = "Group ID the plugins will run as", .group = 3 },
415
{ .name = "debug", .key = 132,
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
266
426
{ .name = NULL }
267
427
};
268
428
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
273
switch (key) {
274
case 'g':
275
if (arg != NULL){
276
char *p;
277
while((p = strsep(&arg, ",")) != NULL){
278
if(p[0] == '\0'){
279
continue;
280
}
281
addargument(getplugin(NULL, plugins), p);
282
}
283
}
284
break;
285
case 'o':
286
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
289
break;
290
}
291
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
315
uid = (uid_t)strtol(arg, NULL, 10);
316
break;
317
case 130:
318
gid = (gid_t)strtol(arg, NULL, 10);
319
break;
320
case 131:
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
435
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
450
break;
451
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
473
}
474
break;
475
case 'E': /* --env-for */
476
{
477
char *envdef = strchr(arg, ':');
478
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
484
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
493
}
494
break;
495
case 'd': /* --disable */
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
511
}
512
break;
513
case 128: /* --plugin-dir */
514
free(plugindir);
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
break;
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
522
break;
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
break;
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
break;
545
case 132: /* --debug */
321
546
debug = true;
322
547
break;
323
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
573
default:
574
return ARGP_ERR_UNKNOWN;
575
}
576
return errno; /* Set to 0 at start */
577
}
578
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
593
break;
594
case 129: /* --config-file */
595
free(argfile);
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
break;
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
case ARGP_KEY_ARG:
608
break;
609
default:
610
return ARGP_ERR_UNKNOWN;
611
}
612
return errno;
613
}
614
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
617
.args_doc = "",
338
618
.doc = "Mandos plugin runner -- Run plugins" };
339
619
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
342
fprintf(stderr, "Unknown error while parsing arguments\n");
343
exitstatus = EXIT_FAILURE;
344
goto end;
345
}
346
347
conffp = fopen(argfile, "r");
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
636
goto fallback;
637
}
638
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
641
642
/* Open the configfile if available */
643
if(argfile == NULL){
644
conffp = fopen(AFILE, "r");
645
} else {
646
conffp = fopen(argfile, "r");
647
}
348
648
if(conffp != NULL){
349
649
char *org_line = NULL;
650
char *p, *arg, *new_arg, *line;
350
651
size_t size = 0;
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
652
const char whitespace_delims[] = " \r\t\f\v\n";
354
653
const char comment_delim[] = "#";
355
654
655
custom_argc = 1;
656
custom_argv = malloc(sizeof(char*) * 2);
657
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
660
goto fallback;
661
}
662
custom_argv[0] = argv[0];
663
custom_argv[1] = NULL;
664
665
/* for each line in the config file, strip whitespace and ignore
666
commented text */
356
667
while(true){
357
668
sret = getline(&org_line, &size, conffp);
358
669
if(sret == -1){
359
670
break;
360
671
}
361
672
362
673
line = org_line;
363
674
arg = strsep(&line, comment_delim);
364
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
366
677
continue;
367
678
}
368
679
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
680
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
683
free(org_line);
684
goto fallback;
685
}
686
687
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
701
}
702
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
375
704
}
376
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
377
714
free(org_line);
378
} else{
715
} else {
379
716
/* Check for harmful errors and go to fallback. Other errors might
380
717
not affect opening plugins */
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
382
perror("fopen");
383
exitstatus = EXIT_FAILURE;
384
goto end;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
721
goto fallback;
385
722
}
386
723
}
387
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
388
726
if(custom_argv != NULL){
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
391
if (ret == ARGP_ERR_UNKNOWN){
392
fprintf(stderr, "Unknown error while parsing arguments\n");
393
exitstatus = EXIT_FAILURE;
394
goto end;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
741
goto fallback;
395
742
}
396
743
}
397
744
745
/* Parse actual command line arguments, to let them override the
746
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
761
goto fallback;
762
}
763
398
764
if(debug){
399
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
400
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
402
768
for(char **a = p->argv; *a != NULL; a++){
403
769
fprintf(stderr, "\tArg: %s\n", *a);
404
770
}
405
}
406
}
407
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
772
for(char **a = p->environ; *a != NULL; a++){
773
fprintf(stderr, "\t%s\n", *a);
774
}
775
}
776
}
777
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
408
807
ret = setuid(uid);
409
if (ret == -1){
410
perror("setuid");
411
}
412
413
setgid(gid);
414
if (ret == -1){
415
perror("setgid");
416
}
417
418
dir = opendir(plugindir);
419
if(dir == NULL){
420
perror("Could not open plugin dir");
421
exitstatus = EXIT_FAILURE;
422
goto end;
423
}
424
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
426
813
{
427
int dir_fd = dirfd(dir);
428
if(dir_fd >= 0){
429
ret = set_cloexec_flag(dir_fd);
430
if(ret < 0){
431
perror("set_cloexec_flag");
432
exitstatus = EXIT_FAILURE;
433
goto end;
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
434
858
}
435
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
436
880
}
437
881
438
882
FD_ZERO(&rfds_all);
439
883
440
while(true){
441
dirst = readdir(dir);
442
443
// All directory entries have been processed
444
if(dirst == NULL){
445
if (errno == EBADF){
446
perror("readdir");
447
exitstatus = EXIT_FAILURE;
448
goto end;
449
}
450
break;
451
}
452
453
d_name_len = strlen(dirst->d_name);
454
455
// Ignore dotfiles, backup files and other junk
456
{
457
bool bad_name = false;
458
459
const char const *bad_prefixes[] = { ".", "#", NULL };
460
461
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
462
".dpkg-old",
463
".dpkg-divert", NULL };
464
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
465
size_t pre_len = strlen(*pre);
466
if((d_name_len >= pre_len)
467
and strncmp((dirst->d_name), *pre, pre_len) == 0){
468
if(debug){
469
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
470
" with bad prefix %s\n", dirst->d_name, *pre);
471
}
472
bad_name = true;
473
break;
474
}
475
}
476
477
if(bad_name){
478
continue;
479
}
480
481
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
482
size_t suf_len = strlen(*suf);
483
if((d_name_len >= suf_len)
484
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
485
== 0)){
486
if(debug){
487
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
488
" with bad suffix %s\n", dirst->d_name, *suf);
489
}
490
bad_name = true;
491
break;
492
}
493
}
494
495
if(bad_name){
496
continue;
497
}
498
}
499
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
502
perror("malloc");
503
continue;
504
}
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
508
509
ret = stat(filename, &st);
510
if (ret == -1){
511
perror("stat");
512
free(filename);
513
continue;
514
}
515
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
884
/* Read and execute any executable in the plugin directory*/
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
891
continue;
892
}
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
if(ret == -1){
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
898
continue;
899
}
900
901
/* Ignore non-executable files */
902
if(not S_ISREG(st.st_mode)
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
517
905
if(debug){
518
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
519
" with bad type or mode\n", filename);
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
520
910
}
521
free(filename);
522
continue;
523
}
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
913
continue;
914
}
915
916
plugin *p = getplugin(direntries[i]->d_name);
917
if(p == NULL){
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
921
continue;
922
}
923
if(p->disabled){
525
924
if(debug){
526
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
527
dirst->d_name);
926
direntries[i]->d_name);
528
927
}
529
free(filename);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
530
930
continue;
531
931
}
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
533
932
{
534
933
/* Add global arguments to argument list for this plugin */
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
537
addargument(p, *a);
538
}
539
}
540
int pipefd[2];
541
ret = pipe(pipefd);
542
if (ret == -1){
543
perror("pipe");
544
exitstatus = EXIT_FAILURE;
545
goto end;
546
}
934
plugin *g = getplugin(NULL);
935
if(g != NULL){
936
for(char **a = g->argv + 1; *a != NULL; a++){
937
if(not add_argument(p, *a)){
938
error(0, errno, "add_argument");
939
}
940
}
941
/* Add global environment variables */
942
for(char **e = g->environ; *e != NULL; e++){
943
if(not add_environment(p, *e, false)){
944
error(0, errno, "add_environment");
945
}
946
}
947
}
948
}
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
951
if(p->environ[0] != NULL){
952
for(char **e = environ; *e != NULL; e++){
953
if(not add_environment(p, *e, false)){
954
error(0, errno, "add_environment");
955
}
956
}
957
}
958
959
int pipefd[2];
960
#ifndef O_CLOEXEC
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
965
if(ret == -1){
966
error(0, errno, "pipe");
967
exitstatus = EX_OSERR;
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
981
/* Ask OS to automatic close the pipe on exec */
547
982
ret = set_cloexec_flag(pipefd[0]);
548
983
if(ret < 0){
549
perror("set_cloexec_flag");
550
exitstatus = EXIT_FAILURE;
551
goto end;
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
552
990
}
553
991
ret = set_cloexec_flag(pipefd[1]);
554
992
if(ret < 0){
555
perror("set_cloexec_flag");
556
exitstatus = EXIT_FAILURE;
557
goto end;
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
558
999
}
1000
#endif /* not O_CLOEXEC */
559
1001
/* Block SIGCHLD until process is safely in process list */
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
1004
NULL));
561
1005
if(ret < 0){
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
564
goto end;
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
1009
goto fallback;
565
1010
}
566
// Starting a new process to be watched
567
pid_t pid = fork();
1011
/* Starting a new process to be watched */
1012
pid_t pid;
1013
do {
1014
pid = fork();
1015
} while(pid == -1 and errno == EINTR);
568
1016
if(pid == -1){
569
perror("fork");
570
exitstatus = EXIT_FAILURE;
571
goto end;
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
1024
goto fallback;
572
1025
}
573
1026
if(pid == 0){
574
1027
/* this is the child process */
575
1028
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
576
1029
if(ret < 0){
577
perror("sigaction");
578
_exit(EXIT_FAILURE);
1030
error(0, errno, "sigaction");
1031
_exit(EX_OSERR);
579
1032
}
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1033
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
581
1034
if(ret < 0){
582
perror("sigprocmask");
583
_exit(EXIT_FAILURE);
1035
error(0, errno, "sigprocmask");
1036
_exit(EX_OSERR);
584
1037
}
585
1038
586
1039
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
587
1040
if(ret == -1){
588
perror("dup2");
589
_exit(EXIT_FAILURE);
1041
error(0, errno, "dup2");
1042
_exit(EX_OSERR);
590
1043
}
591
1044
592
if(dirfd(dir) < 0){
593
/* If dir has no file descriptor, we could not set FD_CLOEXEC
594
above and must now close it manually here. */
595
closedir(dir);
596
}
597
if(execv(filename, p->argv) < 0){
598
perror("execv");
599
_exit(EXIT_FAILURE);
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
600
1051
}
601
1052
/* no return */
602
1053
}
603
/* parent process */
604
free(filename);
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
608
perror("malloc");
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
/* Parent process */
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1059
if(new_plugin == NULL){
1060
error(0, errno, "getplugin");
1061
ret = (int)(TEMP_FAILURE_RETRY
1062
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1063
NULL)));
610
1064
if(ret < 0){
611
perror("sigprocmask");
1065
error(0, errno, "sigprocmask");
612
1066
}
613
exitstatus = EXIT_FAILURE;
614
goto end;
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
1069
goto fallback;
615
1070
}
616
617
*new_process = (struct process){ .pid = pid,
618
.fd = pipefd[0],
619
.next = process_list };
620
// List handling
621
process_list = new_process;
1071
free(direntries[i]);
1072
1073
new_plugin->pid = pid;
1074
new_plugin->fd = pipefd[0];
1075
622
1076
/* Unblock SIGCHLD so signal handler can be run if this process
623
1077
has already completed */
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
1080
NULL));
625
1081
if(ret < 0){
626
perror("sigprocmask");
627
exitstatus = EXIT_FAILURE;
628
goto end;
629
}
630
631
FD_SET(new_process->fd, &rfds_all);
632
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
635
}
636
637
}
638
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
643
free(plugin_list);
644
}
645
646
closedir(dir);
647
dir = NULL;
648
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
651
" directory?\n");
652
process_list = NULL;
653
}
654
while(process_list){
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
1084
goto fallback;
1085
}
1086
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
1101
1102
if(maxfd < new_plugin->fd){
1103
maxfd = new_plugin->fd;
1104
}
1105
}
1106
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1111
free_plugin(getplugin(NULL));
1112
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
if(p->pid != 0){
1115
break;
1116
}
1117
if(p->next == NULL){
1118
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1119
" directory?\n");
1120
free_plugin_list();
1121
}
1122
}
1123
1124
/* Main loop while running plugins exist */
1125
while(plugin_list){
655
1126
fd_set rfds = rfds_all;
656
1127
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
657
if (select_ret == -1){
658
perror("select");
659
exitstatus = EXIT_FAILURE;
660
goto end;
1128
if(select_ret == -1 and errno != EINTR){
1129
error(0, errno, "select");
1130
exitstatus = EX_OSERR;
1131
goto fallback;
661
1132
}
662
1133
/* OK, now either a process completed, or something can be read
663
1134
from one of them */
664
for(process *proc = process_list; proc ; proc = proc->next){
1135
for(plugin *proc = plugin_list; proc != NULL;){
665
1136
/* Is this process completely done? */
666
if(proc->eof and proc->completed){
1137
if(proc->completed and proc->eof){
667
1138
/* Only accept the plugin output if it exited cleanly */
668
1139
if(not WIFEXITED(proc->status)
669
1140
or WEXITSTATUS(proc->status) != 0){
670
1141
/* Bad exit by plugin */
1142
671
1143
if(debug){
672
1144
if(WIFEXITED(proc->status)){
673
fprintf(stderr, "Plugin %u exited with status %d\n",
674
(unsigned int) (proc->pid),
1145
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1146
" status %d\n", proc->name,
1147
(intmax_t) (proc->pid),
675
1148
WEXITSTATUS(proc->status));
676
} else if(WIFSIGNALED(proc->status)) {
677
fprintf(stderr, "Plugin %u killed by signal %d\n",
678
(unsigned int) (proc->pid),
679
WTERMSIG(proc->status));
1149
} else if(WIFSIGNALED(proc->status)){
1150
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1151
" signal %d: %s\n", proc->name,
1152
(intmax_t) (proc->pid),
1153
WTERMSIG(proc->status),
1154
strsignal(WTERMSIG(proc->status)));
680
1155
} else if(WCOREDUMP(proc->status)){
681
fprintf(stderr, "Plugin %d dumped core\n",
682
(unsigned int) (proc->pid));
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1157
" core\n", proc->name, (intmax_t) (proc->pid));
683
1158
}
684
1159
}
1160
685
1161
/* Remove the plugin */
686
FD_CLR(proc->fd, &rfds_all);
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1176
687
1177
/* Block signal while modifying process_list */
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
689
1182
if(ret < 0){
690
perror("sigprocmask");
691
exitstatus = EXIT_FAILURE;
692
goto end;
693
}
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
698
} else {
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
701
if(p->next == proc){
702
p->next = proc->next;
703
break;
704
}
705
}
706
}
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
1185
goto fallback;
1186
}
1187
1188
plugin *next_plugin = proc->next;
1189
free_plugin(proc);
1190
proc = next_plugin;
1191
707
1192
/* We are done modifying process list, so unblock signal */
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
709
NULL);
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
710
1196
if(ret < 0){
711
perror("sigprocmask");
712
}
713
free(proc->buffer);
714
free(proc);
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
717
the process list */
718
break;
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
1199
goto fallback;
1200
}
1201
1202
if(plugin_list == NULL){
1203
break;
1204
}
1205
1206
continue;
719
1207
}
1208
720
1209
/* This process exited nicely, so print its buffer */
721
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1210
1211
bool bret = print_out_password(proc->buffer,
1212
proc->buffer_length);
723
1213
if(not bret){
724
perror("print_out_password");
725
exitstatus = EXIT_FAILURE;
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
726
1216
}
727
goto end;
1217
goto fallback;
728
1218
}
1219
729
1220
/* This process has not completed. Does it have any output? */
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1228
warning from
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
731
1238
/* This process had nothing to say at this time */
1239
proc = proc->next;
732
1240
continue;
733
1241
}
734
1242
/* Before reading, make the process' data buffer large enough */
735
1243
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
736
proc->buffer = realloc(proc->buffer, proc->buffer_size
737
+ (size_t) BUFFER_SIZE);
738
if (proc->buffer == NULL){
739
perror("malloc");
740
exitstatus = EXIT_FAILURE;
741
goto end;
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1247
error(0, errno, "malloc");
1248
exitstatus = EX_OSERR;
1249
goto fallback;
742
1250
}
1251
proc->buffer = new_buffer;
743
1252
proc->buffer_size += BUFFER_SIZE;
744
1253
}
745
1254
/* Read from the process */
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
747
BUFFER_SIZE);
748
if(ret < 0){
1255
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1256
proc->buffer
1257
+ proc->buffer_length,
1258
BUFFER_SIZE));
1259
if(sret < 0){
749
1260
/* Read error from this process; ignore the error */
1261
proc = proc->next;
750
1262
continue;
751
1263
}
752
if(ret == 0){
1264
if(sret == 0){
753
1265
/* got EOF */
754
1266
proc->eof = true;
755
1267
} else {
756
proc->buffer_length += (size_t) ret;
1268
proc->buffer_length += (size_t) sret;
757
1269
}
758
1270
}
759
1271
}
760
761
762
end:
763
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1272
1273
1274
fallback:
1275
1276
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1277
and exitstatus != EX_OK)){
1278
/* Fallback if all plugins failed, none are found or an error
1279
occured */
766
1280
bool bret;
767
1281
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
768
1282
char *passwordbuffer = getpass("Password: ");
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1283
size_t len = strlen(passwordbuffer);
1284
/* Strip trailing newline */
1285
if(len > 0 and passwordbuffer[len-1] == '\n'){
1286
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1287
len--;
1288
}
1289
bret = print_out_password(passwordbuffer, len);
770
1290
if(not bret){
771
perror("print_out_password");
772
exitstatus = EXIT_FAILURE;
773
goto end;
1291
error(0, errno, "print_out_password");
1292
exitstatus = EX_IOERR;
774
1293
}
775
1294
}
776
1295
777
1296
/* Restore old signal handler */
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
779
780
free(custom_argv);
781
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
786
free(plugin_list);
787
}
788
789
if(dir != NULL){
790
closedir(dir);
791
}
792
793
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
800
perror("kill");
801
}
802
free(process_list->buffer);
803
free(process_list);
1297
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1298
if(ret == -1){
1299
error(0, errno, "sigaction");
1300
exitstatus = EX_OSERR;
1301
}
1302
1303
if(custom_argv != NULL){
1304
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1305
free(*arg);
1306
}
1307
free(custom_argv);
1308
}
1309
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1314
}
1315
1316
/* Kill the processes */
1317
for(plugin *p = plugin_list; p != NULL; p = p->next){
1318
if(p->pid != 0){
1319
close(p->fd);
1320
ret = kill(p->pid, SIGTERM);
1321
if(ret == -1 and errno != ESRCH){
1322
/* Set-uid proccesses might not get closed */
1323
error(0, errno, "kill");
1324
}
1325
}
804
1326
}
805
1327
806
1328
/* Wait for any remaining child processes to terminate */
807
do{
1329
do {
808
1330
ret = wait(NULL);
809
1331
} while(ret >= 0);
810
1332
if(errno != ECHILD){
811
perror("wait");
1333
error(0, errno, "wait");
812
1334
}
813
1335
1336
free_plugin_list();
1337
1338
free(plugindir);
1339
free(argfile);
1340
814
1341
return exitstatus;
815
1342
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0