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- Committer: Teddy Hogeborn
- Date: 2008-08-29 05:53:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20080829055359-wkdasnyxtylmnxus
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
"&COMMANDNAME;".
* plugins.d/password-prompt.c (main): Improved some documentation
strings. Do perror() of
tcgetattr() fails. Add debug
output if interrupted by signal.
Loop over write() instead of
using fwrite() when outputting
password. Add debug output if
getline() returns 0, unless it
was caused by a signal. Add
exit status code to debug
output.
* plugins.d/password-prompt.xml: Changed all single quotes to double
quotes for consistency. Removed
<?xml-stylesheet>.
(ENTITY TIMESTAMP): New. Automatically updated by Emacs time-stamp
by using Emacs local variables.
(/refentry/refentryinfo/title): Changed to "Mandos Manual".
(/refentry/refentryinfo/productname): Changed to "Mandos".
(/refentry/refentryinfo/date): New; set to "&TIMESTAMP;".
(/refentry/refentryinfo/copyright): Split copyright holders.
(/refentry/refnamediv/refpurpose): Improved wording.
(SYNOPSIS): Fix to use correct markup. Add short options.
(DESCRIPTION, OPTIONS): Improved wording.
(OPTIONS): Improved wording. Use more correct markup. Document
short options.
(EXIT STATUS): Add text.
(ENVIRONMENT): Document use of "cryptsource" and "crypttarget".
(FILES): REMOVED.
(BUGS): Add text.
(EXAMPLE): Added some examples.
(SECURITY): Added text.
(SEE ALSO): Remove reference to mandos(8). Add reference to
crypttab(5).
"&COMMANDNAME;".
* plugins.d/password-prompt.c (main): Improved some documentation
strings. Do perror() of
tcgetattr() fails. Add debug
output if interrupted by signal.
Loop over write() instead of
using fwrite() when outputting
password. Add debug output if
getline() returns 0, unless it
was caused by a signal. Add
exit status code to debug
output.
* plugins.d/password-prompt.xml: Changed all single quotes to double
quotes for consistency. Removed
<?xml-stylesheet>.
(ENTITY TIMESTAMP): New. Automatically updated by Emacs time-stamp
by using Emacs local variables.
(/refentry/refentryinfo/title): Changed to "Mandos Manual".
(/refentry/refentryinfo/productname): Changed to "Mandos".
(/refentry/refentryinfo/date): New; set to "&TIMESTAMP;".
(/refentry/refentryinfo/copyright): Split copyright holders.
(/refentry/refnamediv/refpurpose): Improved wording.
(SYNOPSIS): Fix to use correct markup. Add short options.
(DESCRIPTION, OPTIONS): Improved wording.
(OPTIONS): Improved wording. Use more correct markup. Document
short options.
(EXIT STATUS): Add text.
(ENVIRONMENT): Document use of "cryptsource" and "crypttarget".
(FILES): REMOVED.
(BUGS): Add text.
(EXAMPLE): Added some examples.
(SECURITY): Added text.
(SEE ALSO): Remove reference to mandos(8). Add reference to
crypttab(5).
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
71
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
84
88
85
89
typedef struct plugin{
86
90
char *name; /* can be NULL or any plugin name */
89
93
char **environ;
90
94
int envc;
91
95
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
102
96
struct plugin *next;
103
97
} plugin;
104
98
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))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
115
103
return p;
116
104
}
117
105
}
118
106
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
124
109
return NULL;
125
110
}
126
111
char *copy_name = NULL;
127
112
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
113
copy_name = strdup(name);
131
114
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
115
return NULL;
136
116
}
137
117
}
138
118
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
143
124
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;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
149
127
free(copy_name);
150
128
free(new_plugin);
151
errno = e;
152
129
return NULL;
153
130
}
154
131
new_plugin->argv[0] = copy_name;
155
132
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
133
134
new_plugin->environ = malloc(sizeof(char *));
160
135
if(new_plugin->environ == NULL){
161
int e = errno;
162
136
free(copy_name);
163
137
free(new_plugin->argv);
164
138
free(new_plugin);
165
errno = e;
166
139
return NULL;
167
140
}
168
141
new_plugin->environ[0] = NULL;
169
170
142
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
172
144
return new_plugin;
173
145
}
174
146
175
147
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
148
static bool add_to_char_array(const char *new, char ***array,
178
149
int *len){
179
150
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
185
153
/* Malloc check */
186
if(new_array == NULL){
154
if(*array == NULL){
187
155
return false;
188
156
}
189
*array = new_array;
190
157
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
158
char *copy = strdup(new);
195
159
if(copy == NULL){
196
160
return false;
197
161
}
204
168
}
205
169
206
170
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
171
static bool add_argument(plugin *p, const char *arg){
209
172
if(p == NULL){
210
173
return false;
213
176
}
214
177
215
178
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
218
180
if(p == NULL){
219
181
return false;
220
182
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
241
183
return add_to_char_array(def, &(p->environ), &(p->envc));
242
184
}
243
185
244
#ifndef O_CLOEXEC
186
245
187
/*
246
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
189
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
191
*/
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
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
253
195
/* If reading the flags failed, return error indication now. */
254
196
if(ret < 0){
255
197
return ret;
256
198
}
257
199
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
201
}
261
#endif /* not O_CLOEXEC */
262
202
203
process *process_list = NULL;
263
204
264
205
/* Mark processes as completed when they exit, and save their exit
265
206
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
268
208
while(true){
269
plugin *proc = plugin_list;
209
process *proc = process_list;
270
210
int status;
271
211
pid_t pid = waitpid(-1, &status, WNOHANG);
272
212
if(pid == 0){
274
214
break;
275
215
}
276
216
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
217
if (errno != ECHILD){
218
perror("waitpid");
280
219
}
281
error(0, errno, "waitpid");
220
/* No child processes */
221
break;
282
222
}
283
223
284
224
/* A child exited, find it in process_list */
285
225
while(proc != NULL and proc->pid != pid){
286
226
proc = proc->next;
290
230
continue;
291
231
}
292
232
proc->status = status;
293
proc->completed = 1;
233
proc->completed = true;
294
234
}
295
errno = old_errno;
296
235
}
297
236
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){
237
bool print_out_password(const char *buffer, size_t length){
301
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
302
242
for(size_t written = 0; written < length; written += (size_t)ret){
303
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
244
length - written));
309
249
return true;
310
250
}
311
251
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
static void free_plugin(plugin *plugin_node){
315
316
free(plugin_node->name);
317
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
318
free(*arg);
319
}
320
free(plugin_node->argv);
321
for(char **env = plugin_node->environ; *env != NULL; env++){
322
free(*env);
323
}
324
free(plugin_node->environ);
325
free(plugin_node->buffer);
326
327
/* Removes the plugin from the singly-linked list */
328
if(plugin_node == plugin_list){
329
/* First one - simple */
330
plugin_list = plugin_list->next;
331
} else {
332
/* Second one or later */
333
for(plugin *p = plugin_list; p != NULL; p = p->next){
334
if(p->next == plugin_node){
335
p->next = plugin_node->next;
336
break;
337
}
338
}
339
}
340
341
free(plugin_node);
342
}
343
344
static void free_plugin_list(void){
345
while(plugin_list != NULL){
346
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
347
264
}
348
265
}
349
266
350
267
int main(int argc, char *argv[]){
351
268
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
269
char *argfile = NULL;
354
270
FILE *conffp;
355
struct dirent **direntries = NULL;
271
size_t d_name_len;
272
DIR *dir = NULL;
273
struct dirent *dirst;
356
274
struct stat st;
357
275
fd_set rfds_all;
358
276
int ret, maxfd = 0;
359
ssize_t sret;
360
277
uid_t uid = 65534;
361
278
gid_t gid = 65534;
362
279
bool debug = false;
366
283
.sa_flags = SA_NOCLDSTOP };
367
284
char **custom_argv = NULL;
368
285
int custom_argc = 0;
369
int dir_fd = -1;
370
286
371
287
/* Establish a signal handler */
372
288
sigemptyset(&sigchld_action.sa_mask);
373
289
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
290
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
377
293
goto fallback;
378
294
}
379
295
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
296
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
383
299
goto fallback;
384
300
}
385
301
388
304
{ .name = "global-options", .key = 'g',
389
305
.arg = "OPTION[,OPTION[,...]]",
390
306
.doc = "Options passed to all plugins" },
391
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
392
308
.arg = "VAR=value",
393
309
.doc = "Environment variable passed to all plugins" },
394
310
{ .name = "options-for", .key = 'o',
395
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
396
312
.doc = "Options passed only to specified plugin" },
397
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
398
314
.arg = "PLUGIN:ENV=value",
399
315
.doc = "Environment variable passed to specified plugin" },
400
316
{ .name = "disable", .key = 'd',
401
317
.arg = "PLUGIN",
402
318
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
406
319
{ .name = "plugin-dir", .key = 128,
407
320
.arg = "DIRECTORY",
408
321
.doc = "Specify a different plugin directory", .group = 2 },
417
330
.doc = "Group ID the plugins will run as", .group = 3 },
418
331
{ .name = "debug", .key = 132,
419
332
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
433
333
{ .name = NULL }
434
334
};
435
335
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
442
case 'g': /* --global-options */
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
448
}
449
}
450
errno = 0;
451
}
452
break;
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
456
}
457
break;
458
case 'o': /* --options-for */
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
477
}
478
}
479
errno = 0;
480
}
481
break;
482
case 'E': /* --env-for */
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
367
}
368
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
483
397
{
484
398
char *envdef = strchr(arg, ':');
485
399
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
491
406
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
499
}
500
}
501
break;
502
case 'd': /* --disable */
503
{
504
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
508
}
509
}
510
break;
511
case 'e': /* --enable */
512
{
513
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
517
}
518
}
519
break;
520
case 128: /* --plugin-dir */
521
free(plugindir);
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
409
}
410
}
411
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
419
}
420
break;
421
case 128:
522
422
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
526
break;
527
case 129: /* --config-file */
528
/* This is already done by parse_opt_config_file() */
529
break;
530
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
540
break;
541
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
551
break;
552
case 132: /* --debug */
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
428
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
553
440
debug = true;
554
441
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
case -3: /* --usage */
569
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
argp_state_help(state, state->out_stream,
571
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
case 'V': /* --version */
573
fprintf(state->out_stream, "%s\n", argp_program_version);
574
exit(EXIT_SUCCESS);
575
break;
576
/*
577
* When adding more options before this line, remember to also add a
578
* "case" to the "parse_opt_config_file" function below.
579
*/
580
case ARGP_KEY_ARG:
581
/* Cryptsetup always passes an argument, which is an empty
582
string if "none" was specified in /etc/crypttab. So if
583
argument was empty, we ignore it silently. */
584
if(arg[0] == '\0'){
585
break;
586
}
587
default:
588
return ARGP_ERR_UNKNOWN;
589
}
590
return errno; /* Set to 0 at start */
591
}
592
593
/* This option parser is the same as parse_opt() above, except it
594
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
600
case 'g': /* --global-options */
601
case 'G': /* --global-env */
602
case 'o': /* --options-for */
603
case 'E': /* --env-for */
604
case 'd': /* --disable */
605
case 'e': /* --enable */
606
case 128: /* --plugin-dir */
607
break;
608
case 129: /* --config-file */
609
free(argfile);
610
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
613
}
614
break;
615
case 130: /* --userid */
616
case 131: /* --groupid */
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
622
case ARGP_KEY_ARG:
623
break;
624
default:
625
return ARGP_ERR_UNKNOWN;
626
}
627
return errno;
628
}
629
630
struct argp argp = { .options = options,
631
.parser = parse_opt_config_file,
632
.args_doc = "",
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
break;
447
default:
448
return ARGP_ERR_UNKNOWN;
449
}
450
return 0;
451
}
452
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
633
457
.doc = "Mandos plugin runner -- Run plugins" };
634
458
635
/* Parse using parse_opt_config_file() in order to get the custom
636
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
639
NULL, NULL);
640
switch(ret){
641
case 0:
642
break;
643
case ENOMEM:
644
default:
645
errno = ret;
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
648
goto fallback;
649
case EINVAL:
650
exitstatus = EX_USAGE;
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
651
463
goto fallback;
652
464
}
653
654
/* Reset to the normal argument parser */
655
argp.parser = parse_opt;
656
657
/* Open the configfile if available */
658
if(argfile == NULL){
465
466
if (argfile == NULL){
659
467
conffp = fopen(AFILE, "r");
660
468
} else {
661
469
conffp = fopen(argfile, "r");
662
470
}
471
663
472
if(conffp != NULL){
664
473
char *org_line = NULL;
665
474
char *p, *arg, *new_arg, *line;
666
475
size_t size = 0;
476
ssize_t sret;
667
477
const char whitespace_delims[] = " \r\t\f\v\n";
668
478
const char comment_delim[] = "#";
669
479
670
480
custom_argc = 1;
671
481
custom_argv = malloc(sizeof(char*) * 2);
672
482
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
675
485
goto fallback;
676
486
}
677
487
custom_argv[0] = argv[0];
678
488
custom_argv[1] = NULL;
679
489
680
/* for each line in the config file, strip whitespace and ignore
681
commented text */
682
490
while(true){
683
491
sret = getline(&org_line, &size, conffp);
684
492
if(sret == -1){
685
493
break;
686
494
}
687
495
688
496
line = org_line;
689
497
arg = strsep(&line, comment_delim);
690
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
693
501
}
694
502
new_arg = strdup(p);
695
503
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
698
506
free(org_line);
699
507
goto fallback;
700
508
}
701
509
702
510
custom_argc += 1;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
511
custom_argv = realloc(custom_argv, sizeof(char *)
512
* ((unsigned int) custom_argc + 1));
513
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
516
free(org_line);
517
goto fallback;
715
518
}
716
519
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
718
521
}
719
522
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
728
523
free(org_line);
729
} else {
524
} else{
730
525
/* Check for harmful errors and go to fallback. Other errors might
731
526
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
735
530
goto fallback;
736
531
}
737
532
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
533
740
534
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
755
goto fallback;
756
}
757
}
758
759
/* Parse actual command line arguments, to let them override the
760
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
539
goto fallback;
793
540
}
794
541
}
795
542
796
543
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
546
p->name ? p->name : "Global", p->argc - 1);
800
547
for(char **a = p->argv; *a != NULL; a++){
801
548
fprintf(stderr, "\tArg: %s\n", *a);
802
549
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
551
for(char **a = p->environ; *a != NULL; a++){
805
552
fprintf(stderr, "\t%s\n", *a);
806
553
}
807
554
}
808
555
}
809
556
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
839
557
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
558
if (ret == -1){
559
perror("setuid");
560
}
561
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
571
}
572
573
if(dir == NULL){
574
perror("Could not open plugin dir");
575
exitstatus = EXIT_FAILURE;
576
goto fallback;
577
}
578
579
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
580
{
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
581
int dir_fd = dirfd(dir);
582
if(dir_fd >= 0){
583
ret = set_cloexec_flag(dir_fd);
584
if(ret < 0){
585
perror("set_cloexec_flag");
586
exitstatus = EXIT_FAILURE;
587
goto fallback;
890
588
}
891
589
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
902
590
}
903
591
904
592
FD_ZERO(&rfds_all);
905
593
906
/* Read and execute any executable in the plugin directory*/
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
913
continue;
914
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
920
continue;
921
}
922
923
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
594
while(true){
595
dirst = readdir(dir);
596
597
// All directory entries have been processed
598
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
break;
605
}
606
607
d_name_len = strlen(dirst->d_name);
608
609
// Ignore dotfiles, backup files and other junk
610
{
611
bool bad_name = false;
612
613
const char const *bad_prefixes[] = { ".", "#", NULL };
614
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
".dpkg-old",
617
".dpkg-divert", NULL };
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
size_t pre_len = strlen(*pre);
620
if((d_name_len >= pre_len)
621
and strncmp((dirst->d_name), *pre, pre_len) == 0){
622
if(debug){
623
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
624
" with bad prefix %s\n", dirst->d_name, *pre);
625
}
626
bad_name = true;
627
break;
628
}
629
}
630
631
if(bad_name){
632
continue;
633
}
634
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
size_t suf_len = strlen(*suf);
637
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
639
== 0)){
640
if(debug){
641
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
642
" with bad suffix %s\n", dirst->d_name, *suf);
643
}
644
bad_name = true;
645
break;
646
}
647
}
648
649
if(bad_name){
650
continue;
651
}
652
}
653
654
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
656
if(ret < 0){
657
perror("asprintf");
658
continue;
659
}
660
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
664
free(filename);
665
continue;
666
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
669
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
" with bad type or mode\n", filename);
932
672
}
933
close(plugin_fd);
934
free(direntries[i]);
673
free(filename);
935
674
continue;
936
675
}
937
938
plugin *p = getplugin(direntries[i]->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
939
677
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
678
perror("getplugin");
679
free(filename);
943
680
continue;
944
681
}
945
682
if(p->disabled){
946
683
if(debug){
947
684
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
685
dirst->d_name);
949
686
}
950
close(plugin_fd);
951
free(direntries[i]);
687
free(filename);
952
688
continue;
953
689
}
954
690
{
955
691
/* Add global arguments to argument list for this plugin */
956
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
957
693
if(g != NULL){
958
694
for(char **a = g->argv + 1; *a != NULL; a++){
959
695
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
696
perror("add_argument");
961
697
}
962
698
}
963
699
/* Add global environment variables */
964
700
for(char **e = g->environ; *e != NULL; e++){
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
701
if(not add_environment(p, *e)){
702
perror("add_environment");
967
703
}
968
704
}
969
705
}
970
706
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
707
/* If this plugin has any environment variables, we will call
708
using execve and need to duplicate the environment from this
709
process, too. */
973
710
if(p->environ[0] != NULL){
974
711
for(char **e = environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
977
719
}
978
720
}
979
721
}
980
722
981
723
int pipefd[2];
982
#ifndef O_CLOEXEC
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
987
if(ret == -1){
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
1003
/* Ask OS to automatic close the pipe on exec */
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
728
goto fallback;
729
}
1004
730
ret = set_cloexec_flag(pipefd[0]);
1005
731
if(ret < 0){
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
1011
734
goto fallback;
1012
735
}
1013
736
ret = set_cloexec_flag(pipefd[1]);
1014
737
if(ret < 0){
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
1020
740
goto fallback;
1021
741
}
1022
#endif /* not O_CLOEXEC */
1023
742
/* Block SIGCHLD until process is safely in process list */
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
744
if(ret < 0){
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
1031
747
goto fallback;
1032
748
}
1033
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
749
// Starting a new process to be watched
750
pid_t pid = fork();
1038
751
if(pid == -1){
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
1046
754
goto fallback;
1047
755
}
1048
756
if(pid == 0){
1049
757
/* this is the child process */
1050
758
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
759
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1054
762
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
764
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1059
767
}
1060
768
1061
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
770
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1065
773
}
1066
774
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
775
if(dirfd(dir) < 0){
776
/* If dir has no file descriptor, we could not set FD_CLOEXEC
777
above and must now close it manually here. */
778
closedir(dir);
779
}
780
if(p->environ[0] == NULL){
781
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
784
}
785
} else {
786
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
789
}
1073
790
}
1074
791
/* no return */
1075
792
}
1076
/* Parent process */
1077
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
793
/* parent process */
794
free(filename);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
800
if(ret < 0){
1086
error(0, errno, "sigprocmask");
801
perror("sigprocmask");
1087
802
}
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
803
exitstatus = EXIT_FAILURE;
1090
804
goto fallback;
1091
805
}
1092
free(direntries[i]);
1093
1094
new_plugin->pid = pid;
1095
new_plugin->fd = pipefd[0];
1096
806
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1097
812
/* Unblock SIGCHLD so signal handler can be run if this process
1098
813
has already completed */
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
1101
NULL));
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1102
815
if(ret < 0){
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1105
818
goto fallback;
1106
819
}
1107
820
1108
FD_SET(new_plugin->fd, &rfds_all);
1109
1110
if(maxfd < new_plugin->fd){
1111
maxfd = new_plugin->fd;
1112
}
1113
}
1114
1115
free(direntries);
1116
direntries = NULL;
1117
close(dir_fd);
1118
dir_fd = -1;
1119
free_plugin(getplugin(NULL));
1120
1121
for(plugin *p = plugin_list; p != NULL; p = p->next){
1122
if(p->pid != 0){
1123
break;
1124
}
1125
if(p->next == NULL){
1126
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1127
" directory?\n");
1128
free_plugin_list();
1129
}
1130
}
1131
1132
/* Main loop while running plugins exist */
1133
while(plugin_list){
821
FD_SET(new_process->fd, &rfds_all);
822
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
825
}
826
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
832
closedir(dir);
833
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
839
}
840
while(process_list){
1134
841
fd_set rfds = rfds_all;
1135
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1136
if(select_ret == -1 and errno != EINTR){
1137
error(0, errno, "select");
1138
exitstatus = EX_OSERR;
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1139
846
goto fallback;
1140
847
}
1141
848
/* OK, now either a process completed, or something can be read
1142
849
from one of them */
1143
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
1144
851
/* Is this process completely done? */
1145
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
1146
853
/* Only accept the plugin output if it exited cleanly */
1147
854
if(not WIFEXITED(proc->status)
1148
855
or WEXITSTATUS(proc->status) != 0){
1149
856
/* Bad exit by plugin */
1150
1151
857
if(debug){
1152
858
if(WIFEXITED(proc->status)){
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1156
861
WEXITSTATUS(proc->status));
1157
} else if(WIFSIGNALED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1159
" signal %d: %s\n", proc->name,
1160
(intmax_t) (proc->pid),
1161
WTERMSIG(proc->status),
1162
strsignal(WTERMSIG(proc->status)));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
866
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1163
869
}
1164
870
}
1165
1166
871
/* Remove the plugin */
1167
872
FD_CLR(proc->fd, &rfds_all);
1168
1169
873
/* Block signal while modifying process_list */
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
(SIG_BLOCK,
1172
&sigchld_action.sa_mask,
1173
NULL));
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1174
875
if(ret < 0){
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1177
878
goto fallback;
1178
879
}
1179
1180
plugin *next_plugin = proc->next;
1181
free_plugin(proc);
1182
proc = next_plugin;
1183
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1184
893
/* We are done modifying process list, so unblock signal */
1185
ret = (int)(TEMP_FAILURE_RETRY
1186
(sigprocmask(SIG_UNBLOCK,
1187
&sigchld_action.sa_mask, NULL)));
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1188
896
if(ret < 0){
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
1191
goto fallback;
1192
}
1193
1194
if(plugin_list == NULL){
1195
break;
1196
}
1197
1198
continue;
897
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1199
905
}
1200
1201
906
/* This process exited nicely, so print its buffer */
1202
907
1203
908
bool bret = print_out_password(proc->buffer,
1204
909
proc->buffer_length);
1205
910
if(not bret){
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1208
913
}
1209
914
goto fallback;
1210
915
}
1211
1212
916
/* This process has not completed. Does it have any output? */
1213
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1214
918
/* This process had nothing to say at this time */
1215
proc = proc->next;
1216
919
continue;
1217
920
}
1218
921
/* Before reading, make the process' data buffer large enough */
1219
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1220
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1221
+ (size_t) BUFFER_SIZE);
1222
if(new_buffer == NULL){
1223
error(0, errno, "malloc");
1224
exitstatus = EX_OSERR;
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1225
928
goto fallback;
1226
929
}
1227
proc->buffer = new_buffer;
1228
930
proc->buffer_size += BUFFER_SIZE;
1229
931
}
1230
932
/* Read from the process */
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
proc->buffer
1233
+ proc->buffer_length,
1234
BUFFER_SIZE));
1235
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1236
936
/* Read error from this process; ignore the error */
1237
proc = proc->next;
1238
937
continue;
1239
938
}
1240
if(sret == 0){
939
if(ret == 0){
1241
940
/* got EOF */
1242
941
proc->eof = true;
1243
942
} else {
1244
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1245
944
}
1246
945
}
1247
946
}
1248
1249
947
948
1250
949
fallback:
1251
950
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1254
952
/* Fallback if all plugins failed, none are found or an error
1255
953
occured */
1256
954
bool bret;
1257
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1258
956
char *passwordbuffer = getpass("Password: ");
1259
size_t len = strlen(passwordbuffer);
1260
/* Strip trailing newline */
1261
if(len > 0 and passwordbuffer[len-1] == '\n'){
1262
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1263
len--;
1264
}
1265
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1266
958
if(not bret){
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1269
961
}
1270
962
}
1271
963
1272
964
/* Restore old signal handler */
1273
965
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1274
966
if(ret == -1){
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1277
969
}
1278
970
1279
971
if(custom_argv != NULL){
1280
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1281
973
free(*arg);
1282
974
}
1283
975
free(custom_argv);
1284
976
}
1285
1286
free(direntries);
1287
1288
if(dir_fd != -1){
1289
close(dir_fd);
977
free_plugin_list(plugin_list);
978
979
if(dir != NULL){
980
closedir(dir);
1290
981
}
1291
982
1292
/* Kill the processes */
1293
for(plugin *p = plugin_list; p != NULL; p = p->next){
1294
if(p->pid != 0){
1295
close(p->fd);
1296
ret = kill(p->pid, SIGTERM);
1297
if(ret == -1 and errno != ESRCH){
1298
/* Set-uid proccesses might not get closed */
1299
error(0, errno, "kill");
1300
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1301
991
}
992
free(process_list->buffer);
993
free(process_list);
1302
994
}
1303
995
1304
996
/* Wait for any remaining child processes to terminate */
1305
do {
997
do{
1306
998
ret = wait(NULL);
1307
999
} while(ret >= 0);
1308
1000
if(errno != ECHILD){
1309
error(0, errno, "wait");
1001
perror("wait");
1310
1002
}
1311
1312
free_plugin_list();
1313
1003
1314
1004
free(plugindir);
1315
free(pluginhelperdir);
1316
1005
free(argfile);
1317
1006
1318
1007
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0