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- Committer: Teddy Hogeborn
- Date: 2008-08-25 06:44:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825064413-smqg5qwxfvhkeop4
* Makefile (DOCBOOKTOMAN): Only cd to one directory.
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
83
86
84
87
typedef struct plugin{
85
88
char *name; /* can be NULL or any plugin name */
88
91
char **environ;
89
92
int envc;
90
93
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
94
struct plugin *next;
102
95
} plugin;
103
96
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))){
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
113
101
return p;
114
102
}
115
103
}
116
104
/* 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){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
122
107
return NULL;
123
108
}
124
109
char *copy_name = NULL;
125
110
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
129
112
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
113
return NULL;
134
114
}
135
115
}
136
116
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
141
122
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;
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
147
125
free(copy_name);
148
126
free(new_plugin);
149
errno = e;
150
127
return NULL;
151
128
}
152
129
new_plugin->argv[0] = copy_name;
153
130
new_plugin->argv[1] = NULL;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
158
133
if(new_plugin->environ == NULL){
159
int e = errno;
160
134
free(copy_name);
161
135
free(new_plugin->argv);
162
136
free(new_plugin);
163
errno = e;
164
137
return NULL;
165
138
}
166
139
new_plugin->environ[0] = NULL;
167
168
140
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
170
142
return new_plugin;
171
143
}
172
144
174
146
static bool add_to_char_array(const char *new, char ***array,
175
147
int *len){
176
148
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
181
151
/* Malloc check */
182
152
if(*array == NULL){
183
153
return false;
184
154
}
185
155
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
190
157
if(copy == NULL){
191
158
return false;
192
159
}
207
174
}
208
175
209
176
/* Add to a plugin's environment */
210
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
211
178
if(p == NULL){
212
179
return false;
213
180
}
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
220
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
226
return false;
227
}
228
*e = new;
229
strcpy(*e, def);
230
}
231
return true;
232
}
233
}
234
181
return add_to_char_array(def, &(p->environ), &(p->envc));
235
182
}
236
183
184
237
185
/*
238
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
187
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
189
*/
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
244
193
/* If reading the flags failed, return error indication now. */
245
194
if(ret < 0){
246
195
return ret;
247
196
}
248
197
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
199
}
252
200
201
process *process_list = NULL;
253
202
254
203
/* Mark processes as completed when they exit, and save their exit
255
204
status. */
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
258
206
while(true){
259
plugin *proc = plugin_list;
207
process *proc = process_list;
260
208
int status;
261
209
pid_t pid = waitpid(-1, &status, WNOHANG);
262
210
if(pid == 0){
264
212
break;
265
213
}
266
214
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
215
if (errno != ECHILD){
216
perror("waitpid");
270
217
}
271
error(0, errno, "waitpid");
218
/* No child processes */
219
break;
272
220
}
273
221
274
222
/* A child exited, find it in process_list */
275
223
while(proc != NULL and proc->pid != pid){
276
224
proc = proc->next;
280
228
continue;
281
229
}
282
230
proc->status = status;
283
proc->completed = 1;
231
proc->completed = true;
284
232
}
285
errno = old_errno;
286
233
}
287
234
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
290
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
291
240
for(size_t written = 0; written < length; written += (size_t)ret){
292
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
293
242
length - written));
298
247
return true;
299
248
}
300
249
301
/* Removes and free a plugin from the plugin list */
302
static void free_plugin(plugin *plugin_node){
303
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
305
free(*arg);
306
}
307
free(plugin_node->argv);
308
for(char **env = plugin_node->environ; *env != NULL; env++){
309
free(*env);
310
}
311
free(plugin_node->environ);
312
free(plugin_node->buffer);
313
314
/* Removes the plugin from the singly-linked list */
315
if(plugin_node == plugin_list){
316
/* First one - simple */
317
plugin_list = plugin_list->next;
318
} else {
319
/* Second one or later */
320
for(plugin *p = plugin_list; p != NULL; p = p->next){
321
if(p->next == plugin_node){
322
p->next = plugin_node->next;
323
break;
324
}
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
325
256
}
326
}
327
328
free(plugin_node);
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
329
270
}
330
271
331
static void free_plugin_list(void){
332
while(plugin_list != NULL){
333
free_plugin(plugin_list);
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
334
284
}
335
285
}
336
286
337
287
int main(int argc, char *argv[]){
338
char *plugindir = NULL;
339
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
340
290
FILE *conffp;
341
291
size_t d_name_len;
342
292
DIR *dir = NULL;
344
294
struct stat st;
345
295
fd_set rfds_all;
346
296
int ret, maxfd = 0;
347
ssize_t sret;
348
297
uid_t uid = 65534;
349
298
gid_t gid = 65534;
350
299
bool debug = false;
359
308
sigemptyset(&sigchld_action.sa_mask);
360
309
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
310
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
311
perror("sigaddset");
312
exitstatus = EXIT_FAILURE;
364
313
goto fallback;
365
314
}
366
315
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
316
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
317
perror("sigaction");
318
exitstatus = EXIT_FAILURE;
370
319
goto fallback;
371
320
}
372
321
375
324
{ .name = "global-options", .key = 'g',
376
325
.arg = "OPTION[,OPTION[,...]]",
377
326
.doc = "Options passed to all plugins" },
378
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
379
328
.arg = "VAR=value",
380
329
.doc = "Environment variable passed to all plugins" },
381
330
{ .name = "options-for", .key = 'o',
382
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
383
332
.doc = "Options passed only to specified plugin" },
384
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
385
334
.arg = "PLUGIN:ENV=value",
386
335
.doc = "Environment variable passed to specified plugin" },
387
336
{ .name = "disable", .key = 'd',
388
337
.arg = "PLUGIN",
389
338
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
391
.arg = "PLUGIN",
392
.doc = "Enable a specific plugin", .group = 1 },
393
339
{ .name = "plugin-dir", .key = 128,
394
340
.arg = "DIRECTORY",
395
341
.doc = "Specify a different plugin directory", .group = 2 },
396
{ .name = "config-file", .key = 129,
397
.arg = "FILE",
398
.doc = "Specify a different configuration file", .group = 2 },
399
{ .name = "userid", .key = 130,
400
.arg = "ID", .flags = 0,
401
.doc = "User ID the plugins will run as", .group = 3 },
402
{ .name = "groupid", .key = 131,
403
.arg = "ID", .flags = 0,
404
.doc = "Group ID the plugins will run as", .group = 3 },
405
{ .name = "debug", .key = 132,
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
416
350
{ .name = NULL }
417
351
};
418
352
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
430
}
431
}
432
}
433
break;
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
436
break;
437
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
456
}
457
}
458
}
459
break;
460
case 'E': /* --env-for */
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
363
continue;
364
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
366
perror("add_argument");
367
return ARGP_ERR_UNKNOWN;
368
}
369
}
370
}
371
break;
372
case 'e':
373
if(arg == NULL){
374
break;
375
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
384
}
385
break;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
406
}
407
}
408
}
409
break;
410
case 'f':
411
if(arg == NULL){
412
break;
413
}
461
414
{
462
415
char *envdef = strchr(arg, ':');
463
416
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
417
break;
418
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
469
423
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
474
}
475
add_environment(getplugin(arg), envdef, true);
476
}
477
break;
478
case 'd': /* --disable */
479
{
480
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
483
}
484
}
485
break;
486
case 'e': /* --enable */
487
{
488
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
491
}
492
}
493
break;
494
case 128: /* --plugin-dir */
495
free(plugindir);
496
plugindir = strdup(arg);
497
break;
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
500
break;
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
510
break;
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
520
break;
521
case 132: /* --debug */
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
425
perror("add_environment");
426
}
427
}
428
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
432
if(p == NULL){
433
return ARGP_ERR_UNKNOWN;
434
}
435
p->disabled = true;
436
}
437
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
522
448
debug = true;
523
449
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
case ARGP_KEY_ARG:
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
549
default:
550
return ARGP_ERR_UNKNOWN;
551
}
552
return errno; /* Set to 0 at start */
553
}
554
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
569
break;
570
case 129: /* --config-file */
571
free(argfile);
572
argfile = strdup(arg);
573
break;
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
case ARGP_KEY_ARG:
581
break;
582
default:
583
return ARGP_ERR_UNKNOWN;
584
}
585
return errno;
586
}
587
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
590
.args_doc = "",
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
591
465
.doc = "Mandos plugin runner -- Run plugins" };
592
466
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
609
goto fallback;
610
}
611
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
614
615
/* Open the configfile if available */
616
if(argfile == NULL){
617
conffp = fopen(AFILE, "r");
618
} else {
619
conffp = fopen(argfile, "r");
620
}
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
469
fprintf(stderr, "Unknown error while parsing arguments\n");
470
exitstatus = EXIT_FAILURE;
471
goto fallback;
472
}
473
474
conffp = fopen(argfile, "r");
621
475
if(conffp != NULL){
622
476
char *org_line = NULL;
623
477
char *p, *arg, *new_arg, *line;
624
478
size_t size = 0;
479
ssize_t sret;
625
480
const char whitespace_delims[] = " \r\t\f\v\n";
626
481
const char comment_delim[] = "#";
627
628
custom_argc = 1;
629
custom_argv = malloc(sizeof(char*) * 2);
630
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
}
635
custom_argv[0] = argv[0];
636
custom_argv[1] = NULL;
637
638
/* for each line in the config file, strip whitespace and ignore
639
commented text */
482
640
483
while(true){
641
484
sret = getline(&org_line, &size, conffp);
642
485
if(sret == -1){
643
486
break;
644
487
}
645
488
646
489
line = org_line;
647
490
arg = strsep(&line, comment_delim);
648
491
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
493
continue;
651
494
}
652
495
new_arg = strdup(p);
653
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
656
free(org_line);
657
goto fallback;
658
}
659
660
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
668
}
669
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
671
502
}
672
503
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
504
free(org_line);
682
} else {
505
} else{
683
506
/* Check for harmful errors and go to fallback. Other errors might
684
507
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
perror("fopen");
510
exitstatus = EXIT_FAILURE;
688
511
goto fallback;
689
512
}
690
513
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
514
693
515
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
520
fprintf(stderr, "Unknown error while parsing arguments\n");
521
exitstatus = EXIT_FAILURE;
708
522
goto fallback;
709
523
}
710
524
}
711
525
712
/* Parse actual command line arguments, to let them override the
713
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
728
goto fallback;
729
}
730
731
526
if(debug){
732
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
733
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
735
530
for(char **a = p->argv; *a != NULL; a++){
736
531
fprintf(stderr, "\tArg: %s\n", *a);
737
532
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
739
534
for(char **a = p->environ; *a != NULL; a++){
740
535
fprintf(stderr, "\t%s\n", *a);
741
536
}
742
537
}
743
538
}
744
539
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
765
543
}
766
544
767
/* Lower permissions */
768
545
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
772
ret = setuid(uid);
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
546
if (ret == -1){
547
perror("setgid");
548
}
549
550
dir = opendir(plugindir);
551
if(dir == NULL){
552
perror("Could not open plugin dir");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
555
}
556
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
778
558
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
559
int dir_fd = dirfd(dir);
560
if(dir_fd >= 0){
561
ret = set_cloexec_flag(dir_fd);
562
if(ret < 0){
563
perror("set_cloexec_flag");
564
exitstatus = EXIT_FAILURE;
565
goto fallback;
566
}
820
567
}
821
568
}
822
569
823
570
FD_ZERO(&rfds_all);
824
571
825
/* Read and execute any executable in the plugin directory*/
826
572
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
573
dirst = readdir(dir);
830
574
831
/* All directory entries have been processed */
575
// All directory entries have been processed
832
576
if(dirst == NULL){
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
577
if (errno == EBADF){
578
perror("readdir");
579
exitstatus = EXIT_FAILURE;
836
580
goto fallback;
837
581
}
838
582
break;
840
584
841
585
d_name_len = strlen(dirst->d_name);
842
586
843
/* Ignore dotfiles, backup files and other junk */
587
// Ignore dotfiles, backup files and other junk
844
588
{
845
589
bool bad_name = false;
846
590
848
592
849
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
850
594
".dpkg-old",
851
".dpkg-bak",
852
595
".dpkg-divert", NULL };
853
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
854
597
size_t pre_len = strlen(*pre);
862
605
break;
863
606
}
864
607
}
608
865
609
if(bad_name){
866
610
continue;
867
611
}
612
868
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
614
size_t suf_len = strlen(*suf);
870
615
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
616
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
617
== 0)){
873
618
if(debug){
874
619
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
883
628
continue;
884
629
}
885
630
}
886
631
887
632
char *filename;
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
891
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
895
}
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
896
634
if(ret < 0){
897
error(0, errno, "asprintf");
635
perror("asprintf");
898
636
continue;
899
637
}
900
638
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
639
ret = stat(filename, &st);
640
if (ret == -1){
641
perror("stat");
904
642
free(filename);
905
643
continue;
906
644
}
907
645
908
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
911
647
if(debug){
912
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
649
" with bad type or mode\n", filename);
915
651
free(filename);
916
652
continue;
917
653
}
918
919
plugin *p = getplugin(dirst->d_name);
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
920
655
if(p == NULL){
921
error(0, errno, "getplugin");
656
perror("getplugin");
922
657
free(filename);
923
658
continue;
924
659
}
932
667
}
933
668
{
934
669
/* Add global arguments to argument list for this plugin */
935
plugin *g = getplugin(NULL);
670
plugin *g = getplugin(NULL, &plugin_list);
936
671
if(g != NULL){
937
672
for(char **a = g->argv + 1; *a != NULL; a++){
938
673
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
674
perror("add_argument");
940
675
}
941
676
}
942
677
/* Add global environment variables */
943
678
for(char **e = g->environ; *e != NULL; e++){
944
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
679
if(not add_environment(p, *e)){
680
perror("add_environment");
946
681
}
947
682
}
948
683
}
952
687
process, too. */
953
688
if(p->environ[0] != NULL){
954
689
for(char **e = environ; *e != NULL; e++){
955
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
696
perror("add_environment");
957
697
}
958
698
}
959
699
}
960
700
961
701
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
702
ret = pipe(pipefd);
703
if (ret == -1){
704
perror("pipe");
705
exitstatus = EXIT_FAILURE;
966
706
goto fallback;
967
707
}
968
/* Ask OS to automatic close the pipe on exec */
969
708
ret = set_cloexec_flag(pipefd[0]);
970
709
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
973
712
goto fallback;
974
713
}
975
714
ret = set_cloexec_flag(pipefd[1]);
976
715
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
716
perror("set_cloexec_flag");
717
exitstatus = EXIT_FAILURE;
979
718
goto fallback;
980
719
}
981
720
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
722
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
723
perror("sigprocmask");
724
exitstatus = EXIT_FAILURE;
988
725
goto fallback;
989
726
}
990
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
727
// Starting a new process to be watched
728
pid_t pid = fork();
995
729
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
730
perror("fork");
731
exitstatus = EXIT_FAILURE;
998
732
goto fallback;
999
733
}
1000
734
if(pid == 0){
1001
735
/* this is the child process */
1002
736
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
737
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
738
perror("sigaction");
739
_exit(EXIT_FAILURE);
1006
740
}
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
742
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
743
perror("sigprocmask");
744
_exit(EXIT_FAILURE);
1011
745
}
1012
746
1013
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
748
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
749
perror("dup2");
750
_exit(EXIT_FAILURE);
1017
751
}
1018
752
1019
753
if(dirfd(dir) < 0){
1023
757
}
1024
758
if(p->environ[0] == NULL){
1025
759
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
760
perror("execv");
761
_exit(EXIT_FAILURE);
1028
762
}
1029
763
} else {
1030
764
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
765
perror("execve");
766
_exit(EXIT_FAILURE);
1033
767
}
1034
768
}
1035
769
/* no return */
1036
770
}
1037
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
771
/* parent process */
1040
772
free(filename);
1041
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
778
if(ret < 0){
1048
error(0, errno, "sigprocmask");
779
perror("sigprocmask");
1049
780
}
1050
exitstatus = EX_OSERR;
781
exitstatus = EXIT_FAILURE;
1051
782
goto fallback;
1052
783
}
1053
784
1054
new_plugin->pid = pid;
1055
new_plugin->fd = pipefd[0];
1056
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
1057
790
/* Unblock SIGCHLD so signal handler can be run if this process
1058
791
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
793
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
794
perror("sigprocmask");
795
exitstatus = EXIT_FAILURE;
1065
796
goto fallback;
1066
797
}
1067
798
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
799
FD_SET(new_process->fd, &rfds_all);
1070
800
1071
if(maxfd < new_plugin->fd){
1072
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
1073
803
}
804
1074
805
}
1075
806
1076
TEMP_FAILURE_RETRY(closedir(dir));
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
1077
811
dir = NULL;
1078
free_plugin(getplugin(NULL));
1079
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
if(p->pid != 0){
1082
break;
1083
}
1084
if(p->next == NULL){
1085
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1086
" directory?\n");
1087
free_plugin_list();
1088
}
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
1089
817
}
1090
1091
/* Main loop while running plugins exist */
1092
while(plugin_list){
818
while(process_list){
1093
819
fd_set rfds = rfds_all;
1094
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
821
if (select_ret == -1){
822
perror("select");
823
exitstatus = EXIT_FAILURE;
1098
824
goto fallback;
1099
825
}
1100
826
/* OK, now either a process completed, or something can be read
1101
827
from one of them */
1102
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
1103
829
/* Is this process completely done? */
1104
if(proc->completed and proc->eof){
830
if(proc->eof and proc->completed){
1105
831
/* Only accept the plugin output if it exited cleanly */
1106
832
if(not WIFEXITED(proc->status)
1107
833
or WEXITSTATUS(proc->status) != 0){
1108
834
/* Bad exit by plugin */
1109
1110
835
if(debug){
1111
836
if(WIFEXITED(proc->status)){
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
1115
839
WEXITSTATUS(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
1122
844
} else if(WCOREDUMP(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
1125
847
}
1126
848
}
1127
1128
849
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
850
FD_CLR(proc->fd, &rfds_all);
1132
851
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1137
853
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1140
856
goto fallback;
1141
857
}
1142
1143
plugin *next_plugin = proc->next;
1144
free_plugin(proc);
1145
proc = next_plugin;
1146
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1147
871
/* We are done modifying process list, so unblock signal */
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1151
874
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1154
goto fallback;
1155
}
1156
1157
if(plugin_list == NULL){
1158
break;
1159
}
1160
1161
continue;
875
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1162
883
}
1163
1164
884
/* This process exited nicely, so print its buffer */
1165
885
1166
886
bool bret = print_out_password(proc->buffer,
1167
887
proc->buffer_length);
1168
888
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
889
perror("print_out_password");
890
exitstatus = EXIT_FAILURE;
1171
891
}
1172
892
goto fallback;
1173
893
}
1174
1175
894
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
896
/* This process had nothing to say at this time */
1180
proc = proc->next;
1181
897
continue;
1182
898
}
1183
899
/* Before reading, make the process' data buffer large enough */
1184
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
902
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
903
if (proc->buffer == NULL){
904
perror("malloc");
905
exitstatus = EXIT_FAILURE;
1190
906
goto fallback;
1191
907
}
1192
908
proc->buffer_size += BUFFER_SIZE;
1193
909
}
1194
910
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1199
if(sret < 0){
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1200
914
/* Read error from this process; ignore the error */
1201
proc = proc->next;
1202
915
continue;
1203
916
}
1204
if(sret == 0){
917
if(ret == 0){
1205
918
/* got EOF */
1206
919
proc->eof = true;
1207
920
} else {
1208
proc->buffer_length += (size_t) sret;
921
proc->buffer_length += (size_t) ret;
1209
922
}
1210
923
}
1211
924
}
1212
1213
925
926
1214
927
fallback:
1215
928
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1218
930
/* Fallback if all plugins failed, none are found or an error
1219
931
occured */
1220
932
bool bret;
1221
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1222
934
char *passwordbuffer = getpass("Password: ");
1223
size_t len = strlen(passwordbuffer);
1224
/* Strip trailing newline */
1225
if(len > 0 and passwordbuffer[len-1] == '\n'){
1226
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1227
len--;
1228
}
1229
bret = print_out_password(passwordbuffer, len);
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1230
936
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
937
perror("print_out_password");
938
exitstatus = EXIT_FAILURE;
1233
939
}
1234
940
}
1235
941
1236
942
/* Restore old signal handler */
1237
943
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
944
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
945
perror("sigaction");
946
exitstatus = EXIT_FAILURE;
1241
947
}
1242
948
1243
949
if(custom_argv != NULL){
1244
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1245
951
free(*arg);
1246
952
}
1247
953
free(custom_argv);
1248
954
}
955
free_plugin_list(plugin_list);
1249
956
1250
957
if(dir != NULL){
1251
958
closedir(dir);
1252
959
}
1253
960
1254
/* Kill the processes */
1255
for(plugin *p = plugin_list; p != NULL; p = p->next){
1256
if(p->pid != 0){
1257
close(p->fd);
1258
ret = kill(p->pid, SIGTERM);
1259
if(ret == -1 and errno != ESRCH){
1260
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1262
}
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1263
969
}
970
free(process_list->buffer);
971
free(process_list);
1264
972
}
1265
973
1266
974
/* Wait for any remaining child processes to terminate */
1267
do {
975
do{
1268
976
ret = wait(NULL);
1269
977
} while(ret >= 0);
1270
978
if(errno != ECHILD){
1271
error(0, errno, "wait");
979
perror("wait");
1272
980
}
1273
981
1274
free_plugin_list();
1275
1276
free(plugindir);
1277
free(argfile);
1278
1279
982
return exitstatus;
1280
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0