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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
- network-hooks.d
- 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 © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
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
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
82
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;
83
88
84
89
typedef struct plugin{
85
90
char *name; /* can be NULL or any plugin name */
88
93
char **environ;
89
94
int envc;
90
95
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
101
96
struct plugin *next;
102
97
} plugin;
103
98
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
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
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))){
113
103
return p;
114
104
}
115
105
}
116
106
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
122
109
return NULL;
123
110
}
124
111
char *copy_name = NULL;
125
112
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
113
copy_name = strdup(name);
129
114
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
115
return NULL;
134
116
}
135
117
}
136
118
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
141
124
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
147
127
free(copy_name);
148
128
free(new_plugin);
149
errno = e;
150
129
return NULL;
151
130
}
152
131
new_plugin->argv[0] = copy_name;
153
132
new_plugin->argv[1] = NULL;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
133
134
new_plugin->environ = malloc(sizeof(char *));
158
135
if(new_plugin->environ == NULL){
159
int e = errno;
160
136
free(copy_name);
161
137
free(new_plugin->argv);
162
138
free(new_plugin);
163
errno = e;
164
139
return NULL;
165
140
}
166
141
new_plugin->environ[0] = NULL;
167
168
142
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
170
144
return new_plugin;
171
145
}
172
146
173
147
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
148
static bool add_to_char_array(const char *new, char ***array,
176
149
int *len){
177
150
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
182
153
/* Malloc check */
183
154
if(*array == NULL){
184
155
return false;
185
156
}
186
157
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
158
char *copy = strdup(new);
191
159
if(copy == NULL){
192
160
return false;
193
161
}
200
168
}
201
169
202
170
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
171
static bool add_argument(plugin *p, const char *arg){
205
172
if(p == NULL){
206
173
return false;
209
176
}
210
177
211
178
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
214
180
if(p == NULL){
215
181
return false;
216
182
}
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
223
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
229
return false;
230
}
231
*e = new;
232
strcpy(*e, def);
233
}
234
return true;
235
}
236
}
237
183
return add_to_char_array(def, &(p->environ), &(p->envc));
238
184
}
239
185
186
240
187
/*
241
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
189
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
191
*/
245
static int set_cloexec_flag(int fd){
246
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);
247
195
/* If reading the flags failed, return error indication now. */
248
196
if(ret < 0){
249
197
return ret;
250
198
}
251
199
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
201
}
255
202
203
process *process_list = NULL;
256
204
257
205
/* Mark processes as completed when they exit, and save their exit
258
206
status. */
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
261
208
while(true){
262
plugin *proc = plugin_list;
209
process *proc = process_list;
263
210
int status;
264
211
pid_t pid = waitpid(-1, &status, WNOHANG);
265
212
if(pid == 0){
267
214
break;
268
215
}
269
216
if(pid == -1){
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
217
if (errno != ECHILD){
218
perror("waitpid");
273
219
}
274
error(0, errno, "waitpid");
220
/* No child processes */
221
break;
275
222
}
276
223
277
224
/* A child exited, find it in process_list */
278
225
while(proc != NULL and proc->pid != pid){
279
226
proc = proc->next;
283
230
continue;
284
231
}
285
232
proc->status = status;
286
proc->completed = 1;
233
proc->completed = true;
287
234
}
288
errno = old_errno;
289
235
}
290
236
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
294
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
295
242
for(size_t written = 0; written < length; written += (size_t)ret){
296
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
297
244
length - written));
302
249
return true;
303
250
}
304
251
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
static void free_plugin(plugin *plugin_node){
308
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
310
free(*arg);
311
}
312
free(plugin_node->argv);
313
for(char **env = plugin_node->environ; *env != NULL; env++){
314
free(*env);
315
}
316
free(plugin_node->environ);
317
free(plugin_node->buffer);
318
319
/* Removes the plugin from the singly-linked list */
320
if(plugin_node == plugin_list){
321
/* First one - simple */
322
plugin_list = plugin_list->next;
323
} else {
324
/* Second one or later */
325
for(plugin *p = plugin_list; p != NULL; p = p->next){
326
if(p->next == plugin_node){
327
p->next = plugin_node->next;
328
break;
329
}
330
}
331
}
332
333
free(plugin_node);
334
}
335
336
static void free_plugin_list(void){
337
while(plugin_list != NULL){
338
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);
339
264
}
340
265
}
341
266
349
274
struct stat st;
350
275
fd_set rfds_all;
351
276
int ret, maxfd = 0;
352
ssize_t sret;
353
277
uid_t uid = 65534;
354
278
gid_t gid = 65534;
355
279
bool debug = false;
364
288
sigemptyset(&sigchld_action.sa_mask);
365
289
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
290
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
369
293
goto fallback;
370
294
}
371
295
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
296
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
375
299
goto fallback;
376
300
}
377
301
380
304
{ .name = "global-options", .key = 'g',
381
305
.arg = "OPTION[,OPTION[,...]]",
382
306
.doc = "Options passed to all plugins" },
383
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
384
308
.arg = "VAR=value",
385
309
.doc = "Environment variable passed to all plugins" },
386
310
{ .name = "options-for", .key = 'o',
387
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
388
312
.doc = "Options passed only to specified plugin" },
389
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
390
314
.arg = "PLUGIN:ENV=value",
391
315
.doc = "Environment variable passed to specified plugin" },
392
316
{ .name = "disable", .key = 'd',
393
317
.arg = "PLUGIN",
394
318
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
396
.arg = "PLUGIN",
397
.doc = "Enable a specific plugin", .group = 1 },
398
319
{ .name = "plugin-dir", .key = 128,
399
320
.arg = "DIRECTORY",
400
321
.doc = "Specify a different plugin directory", .group = 2 },
409
330
.doc = "Group ID the plugins will run as", .group = 3 },
410
331
{ .name = "debug", .key = 132,
411
332
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
421
333
{ .name = NULL }
422
334
};
423
335
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
436
}
437
}
438
}
439
break;
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
442
break;
443
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
462
}
463
}
464
}
465
break;
466
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
}
467
397
{
468
398
char *envdef = strchr(arg, ':');
469
399
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
break;
473
}
474
*envdef = '\0';
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
475
406
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
480
}
481
add_environment(getplugin(arg), envdef, true);
482
}
483
break;
484
case 'd': /* --disable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
489
}
490
}
491
break;
492
case 'e': /* --enable */
493
{
494
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
497
}
498
}
499
break;
500
case 128: /* --plugin-dir */
501
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:
502
422
plugindir = strdup(arg);
503
break;
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
506
break;
507
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
516
break;
517
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
526
break;
527
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:
528
440
debug = true;
529
441
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
548
case ARGP_KEY_ARG:
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
554
}
555
default:
556
return ARGP_ERR_UNKNOWN;
557
}
558
return errno; /* Set to 0 at start */
559
}
560
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
575
break;
576
case 129: /* --config-file */
577
free(argfile);
578
argfile = strdup(arg);
579
break;
580
case 130: /* --userid */
581
case 131: /* --groupid */
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
case ARGP_KEY_ARG:
587
break;
588
default:
589
return ARGP_ERR_UNKNOWN;
590
}
591
return errno;
592
}
593
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
596
.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]",
597
457
.doc = "Mandos plugin runner -- Run plugins" };
598
458
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
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;
615
463
goto fallback;
616
464
}
617
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
620
621
/* Open the configfile if available */
622
if(argfile == NULL){
465
466
if (argfile == NULL){
623
467
conffp = fopen(AFILE, "r");
624
468
} else {
625
469
conffp = fopen(argfile, "r");
626
470
}
471
627
472
if(conffp != NULL){
628
473
char *org_line = NULL;
629
474
char *p, *arg, *new_arg, *line;
630
475
size_t size = 0;
476
ssize_t sret;
631
477
const char whitespace_delims[] = " \r\t\f\v\n";
632
478
const char comment_delim[] = "#";
633
479
634
480
custom_argc = 1;
635
481
custom_argv = malloc(sizeof(char*) * 2);
636
482
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
639
485
goto fallback;
640
486
}
641
487
custom_argv[0] = argv[0];
642
488
custom_argv[1] = NULL;
643
489
644
/* for each line in the config file, strip whitespace and ignore
645
commented text */
646
490
while(true){
647
491
sret = getline(&org_line, &size, conffp);
648
492
if(sret == -1){
649
493
break;
650
494
}
651
495
652
496
line = org_line;
653
497
arg = strsep(&line, comment_delim);
654
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
657
501
}
658
502
new_arg = strdup(p);
659
503
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
662
506
free(org_line);
663
507
goto fallback;
664
508
}
667
511
custom_argv = realloc(custom_argv, sizeof(char *)
668
512
* ((unsigned int) custom_argc + 1));
669
513
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
672
516
free(org_line);
673
517
goto fallback;
674
518
}
675
519
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
677
521
}
678
522
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
523
free(org_line);
688
} else {
524
} else{
689
525
/* Check for harmful errors and go to fallback. Other errors might
690
526
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
694
530
goto fallback;
695
531
}
696
532
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
533
699
534
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
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;
714
539
goto fallback;
715
540
}
716
541
}
717
542
718
/* Parse actual command line arguments, to let them override the
719
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
734
goto fallback;
735
}
736
737
543
if(debug){
738
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
739
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
741
547
for(char **a = p->argv; *a != NULL; a++){
742
548
fprintf(stderr, "\tArg: %s\n", *a);
743
549
}
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
745
551
for(char **a = p->environ; *a != NULL; a++){
746
552
fprintf(stderr, "\t%s\n", *a);
747
553
}
748
554
}
749
555
}
750
556
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
771
560
}
772
561
773
/* Lower permissions */
774
562
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
778
ret = setuid(uid);
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
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 */
784
580
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
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;
588
}
826
589
}
827
590
}
828
591
829
592
FD_ZERO(&rfds_all);
830
593
831
/* Read and execute any executable in the plugin directory*/
832
594
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
595
dirst = readdir(dir);
836
596
837
/* All directory entries have been processed */
597
// All directory entries have been processed
838
598
if(dirst == NULL){
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
842
602
goto fallback;
843
603
}
844
604
break;
846
606
847
607
d_name_len = strlen(dirst->d_name);
848
608
849
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
850
610
{
851
611
bool bad_name = false;
852
612
854
614
855
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
856
616
".dpkg-old",
857
".dpkg-bak",
858
617
".dpkg-divert", NULL };
859
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
860
619
size_t pre_len = strlen(*pre);
868
627
break;
869
628
}
870
629
}
630
871
631
if(bad_name){
872
632
continue;
873
633
}
634
874
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
636
size_t suf_len = strlen(*suf);
876
637
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
639
== 0)){
879
640
if(debug){
880
641
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
650
continue;
890
651
}
891
652
}
892
653
893
654
char *filename;
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
901
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
902
656
if(ret < 0){
903
error(0, errno, "asprintf");
657
perror("asprintf");
904
658
continue;
905
659
}
906
660
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
910
664
free(filename);
911
665
continue;
912
666
}
913
667
914
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
669
if(debug){
918
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
671
" with bad type or mode\n", filename);
921
673
free(filename);
922
674
continue;
923
675
}
924
925
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
926
677
if(p == NULL){
927
error(0, errno, "getplugin");
678
perror("getplugin");
928
679
free(filename);
929
680
continue;
930
681
}
938
689
}
939
690
{
940
691
/* Add global arguments to argument list for this plugin */
941
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
942
693
if(g != NULL){
943
694
for(char **a = g->argv + 1; *a != NULL; a++){
944
695
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
696
perror("add_argument");
946
697
}
947
698
}
948
699
/* Add global environment variables */
949
700
for(char **e = g->environ; *e != NULL; e++){
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
701
if(not add_environment(p, *e)){
702
perror("add_environment");
952
703
}
953
704
}
954
705
}
958
709
process, too. */
959
710
if(p->environ[0] != NULL){
960
711
for(char **e = environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
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");
963
719
}
964
720
}
965
721
}
966
722
967
723
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
972
728
goto fallback;
973
729
}
974
/* Ask OS to automatic close the pipe on exec */
975
730
ret = set_cloexec_flag(pipefd[0]);
976
731
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
979
734
goto fallback;
980
735
}
981
736
ret = set_cloexec_flag(pipefd[1]);
982
737
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
985
740
goto fallback;
986
741
}
987
742
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
744
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
994
747
goto fallback;
995
748
}
996
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
749
// Starting a new process to be watched
750
pid_t pid = fork();
1001
751
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
1004
754
goto fallback;
1005
755
}
1006
756
if(pid == 0){
1007
757
/* this is the child process */
1008
758
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
759
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1012
762
}
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
764
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1017
767
}
1018
768
1019
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
770
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1023
773
}
1024
774
1025
775
if(dirfd(dir) < 0){
1029
779
}
1030
780
if(p->environ[0] == NULL){
1031
781
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
782
perror("execv");
783
_exit(EXIT_FAILURE);
1034
784
}
1035
785
} else {
1036
786
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
787
perror("execve");
788
_exit(EXIT_FAILURE);
1039
789
}
1040
790
}
1041
791
/* no return */
1042
792
}
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
793
/* parent process */
1046
794
free(filename);
1047
plugin *new_plugin = getplugin(dirst->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
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);
1053
800
if(ret < 0){
1054
error(0, errno, "sigprocmask");
801
perror("sigprocmask");
1055
802
}
1056
exitstatus = EX_OSERR;
803
exitstatus = EXIT_FAILURE;
1057
804
goto fallback;
1058
805
}
1059
806
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1062
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1063
812
/* Unblock SIGCHLD so signal handler can be run if this process
1064
813
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
815
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1071
818
goto fallback;
1072
819
}
1073
820
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
821
FD_SET(new_process->fd, &rfds_all);
1076
822
1077
if(maxfd < new_plugin->fd){
1078
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1079
825
}
826
1080
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
1081
831
1082
TEMP_FAILURE_RETRY(closedir(dir));
832
closedir(dir);
1083
833
dir = NULL;
1084
free_plugin(getplugin(NULL));
1085
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1087
if(p->pid != 0){
1088
break;
1089
}
1090
if(p->next == NULL){
1091
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1092
" directory?\n");
1093
free_plugin_list();
1094
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1095
839
}
1096
1097
/* Main loop while running plugins exist */
1098
while(plugin_list){
840
while(process_list){
1099
841
fd_set rfds = rfds_all;
1100
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1104
846
goto fallback;
1105
847
}
1106
848
/* OK, now either a process completed, or something can be read
1107
849
from one of them */
1108
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
1109
851
/* Is this process completely done? */
1110
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
1111
853
/* Only accept the plugin output if it exited cleanly */
1112
854
if(not WIFEXITED(proc->status)
1113
855
or WEXITSTATUS(proc->status) != 0){
1114
856
/* Bad exit by plugin */
1115
1116
857
if(debug){
1117
858
if(WIFEXITED(proc->status)){
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1121
861
WEXITSTATUS(proc->status));
1122
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
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));
1128
866
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1131
869
}
1132
870
}
1133
1134
871
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
872
FD_CLR(proc->fd, &rfds_all);
1138
873
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1143
875
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1146
878
goto fallback;
1147
879
}
1148
1149
plugin *next_plugin = proc->next;
1150
free_plugin(proc);
1151
proc = next_plugin;
1152
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
}
1153
893
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1157
896
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1160
goto fallback;
1161
}
1162
1163
if(plugin_list == NULL){
1164
break;
1165
}
1166
1167
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;
1168
905
}
1169
1170
906
/* This process exited nicely, so print its buffer */
1171
907
1172
908
bool bret = print_out_password(proc->buffer,
1173
909
proc->buffer_length);
1174
910
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1177
913
}
1178
914
goto fallback;
1179
915
}
1180
1181
916
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
918
/* This process had nothing to say at this time */
1186
proc = proc->next;
1187
919
continue;
1188
920
}
1189
921
/* Before reading, make the process' data buffer large enough */
1190
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1191
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
924
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1196
928
goto fallback;
1197
929
}
1198
930
proc->buffer_size += BUFFER_SIZE;
1199
931
}
1200
932
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1206
936
/* Read error from this process; ignore the error */
1207
proc = proc->next;
1208
937
continue;
1209
938
}
1210
if(sret == 0){
939
if(ret == 0){
1211
940
/* got EOF */
1212
941
proc->eof = true;
1213
942
} else {
1214
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1215
944
}
1216
945
}
1217
946
}
1218
1219
947
948
1220
949
fallback:
1221
950
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1224
952
/* Fallback if all plugins failed, none are found or an error
1225
953
occured */
1226
954
bool bret;
1227
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1228
956
char *passwordbuffer = getpass("Password: ");
1229
size_t len = strlen(passwordbuffer);
1230
/* Strip trailing newline */
1231
if(len > 0 and passwordbuffer[len-1] == '\n'){
1232
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1233
len--;
1234
}
1235
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1236
958
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1239
961
}
1240
962
}
1241
963
1242
964
/* Restore old signal handler */
1243
965
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
966
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1247
969
}
1248
970
1249
971
if(custom_argv != NULL){
1250
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1251
973
free(*arg);
1252
974
}
1253
975
free(custom_argv);
1254
976
}
977
free_plugin_list(plugin_list);
1255
978
1256
979
if(dir != NULL){
1257
980
closedir(dir);
1258
981
}
1259
982
1260
/* Kill the processes */
1261
for(plugin *p = plugin_list; p != NULL; p = p->next){
1262
if(p->pid != 0){
1263
close(p->fd);
1264
ret = kill(p->pid, SIGTERM);
1265
if(ret == -1 and errno != ESRCH){
1266
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1268
}
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");
1269
991
}
992
free(process_list->buffer);
993
free(process_list);
1270
994
}
1271
995
1272
996
/* Wait for any remaining child processes to terminate */
1273
do {
997
do{
1274
998
ret = wait(NULL);
1275
999
} while(ret >= 0);
1276
1000
if(errno != ECHILD){
1277
error(0, errno, "wait");
1001
perror("wait");
1278
1002
}
1279
1280
free_plugin_list();
1281
1003
1282
1004
free(plugindir);
1283
1005
free(argfile);
1284
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0