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- Committer: Teddy Hogeborn
- Date: 2008-08-31 08:47:38 UTC
- Revision ID: teddy@fukt.bsnet.se-20080831084738-uu70kayyt876982d
* mandos-keygen: Minor help text change.
* mandos-keygen.xml: Changed plural "keys" to singular "key"
throughout.
(NAME): Improved wording.
(DESCRIPTION): Improved wording.
(OPTIONS): Split options in <term> tags into separate <term> tags.
Use <option> tags. Move long options before short
options. Uppercase replaceables.
(OVERVIEW): Improved wording.
(EXIT STATUS): Also cover --password option.
(EXAMPLE): Add two examples using the --password option.
(SECURITY): Improved wording.
* overview.xml: Improved wording.
* mandos-keygen.xml: Changed plural "keys" to singular "key"
throughout.
(NAME): Improved wording.
(DESCRIPTION): Improved wording.
(OPTIONS): Split options in <term> tags into separate <term> tags.
Use <option> tags. Move long options before short
options. Uppercase replaceables.
(OVERVIEW): Improved wording.
(EXIT STATUS): Also cover --password option.
(EXAMPLE): Add two examples using the --password option.
(SECURITY): Improved wording.
* overview.xml: Improved wording.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
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> /* perror, 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
66
74
67
#define BUFFER_SIZE 256
75
68
76
69
#define PDIR "/lib/mandos/plugins.d"
77
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
71
79
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
80
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
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;
88
82
89
typedef struct plugin{
83
90
char *name; /* can be NULL or any plugin name */
84
91
char **argv;
86
93
char **environ;
87
94
int envc;
88
95
bool disabled;
89
90
/* Variables used for running processes*/
91
pid_t pid;
92
int fd;
93
char *buffer;
94
size_t buffer_size;
95
size_t buffer_length;
96
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
99
96
struct plugin *next;
100
97
} plugin;
101
98
102
static plugin *plugin_list = NULL;
103
104
/* Gets an existing plugin based on name,
105
or if none is found, creates a new one */
106
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
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))){
111
103
return p;
112
104
}
113
105
}
114
106
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
120
109
return NULL;
121
110
}
122
111
char *copy_name = NULL;
123
112
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
113
copy_name = strdup(name);
127
114
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
115
return NULL;
132
116
}
133
117
}
134
118
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
139
124
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
145
127
free(copy_name);
146
128
free(new_plugin);
147
errno = e;
148
129
return NULL;
149
130
}
150
131
new_plugin->argv[0] = copy_name;
151
132
new_plugin->argv[1] = NULL;
152
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
133
134
new_plugin->environ = malloc(sizeof(char *));
156
135
if(new_plugin->environ == NULL){
157
int e = errno;
158
136
free(copy_name);
159
137
free(new_plugin->argv);
160
138
free(new_plugin);
161
errno = e;
162
139
return NULL;
163
140
}
164
141
new_plugin->environ[0] = NULL;
165
166
142
/* Append the new plugin to the list */
167
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
168
144
return new_plugin;
169
145
}
170
146
172
148
static bool add_to_char_array(const char *new, char ***array,
173
149
int *len){
174
150
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
179
153
/* Malloc check */
180
154
if(*array == NULL){
181
155
return false;
182
156
}
183
157
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
158
char *copy = strdup(new);
188
159
if(copy == NULL){
189
160
return false;
190
161
}
205
176
}
206
177
207
178
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
209
180
if(p == NULL){
210
181
return false;
211
182
}
212
/* namelen = length of name of environment variable */
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
218
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
224
return false;
225
}
226
*e = new;
227
strcpy(*e, def);
228
}
229
return true;
230
}
231
}
232
183
return add_to_char_array(def, &(p->environ), &(p->envc));
233
184
}
234
185
186
235
187
/*
236
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
189
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
191
*/
240
static int set_cloexec_flag(int fd){
241
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);
242
195
/* If reading the flags failed, return error indication now. */
243
196
if(ret < 0){
244
197
return ret;
245
198
}
246
199
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
201
}
250
202
203
process *process_list = NULL;
251
204
252
205
/* Mark processes as completed when they exit, and save their exit
253
206
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
256
208
while(true){
257
plugin *proc = plugin_list;
209
process *proc = process_list;
258
210
int status;
259
211
pid_t pid = waitpid(-1, &status, WNOHANG);
260
212
if(pid == 0){
262
214
break;
263
215
}
264
216
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
217
if (errno != ECHILD){
218
perror("waitpid");
268
219
}
269
perror("waitpid");
220
/* No child processes */
221
break;
270
222
}
271
223
272
224
/* A child exited, find it in process_list */
273
225
while(proc != NULL and proc->pid != pid){
274
226
proc = proc->next;
278
230
continue;
279
231
}
280
232
proc->status = status;
281
proc->completed = 1;
233
proc->completed = true;
282
234
}
283
errno = old_errno;
284
235
}
285
236
286
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
288
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
289
242
for(size_t written = 0; written < length; written += (size_t)ret){
290
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
244
length - written));
296
249
return true;
297
250
}
298
251
299
/* Removes and free a plugin from the plugin list */
300
static void free_plugin(plugin *plugin_node){
301
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
303
free(*arg);
304
}
305
free(plugin_node->argv);
306
for(char **env = plugin_node->environ; *env != NULL; env++){
307
free(*env);
308
}
309
free(plugin_node->environ);
310
free(plugin_node->buffer);
311
312
/* Removes the plugin from the singly-linked list */
313
if(plugin_node == plugin_list){
314
/* First one - simple */
315
plugin_list = plugin_list->next;
316
} else {
317
/* Second one or later */
318
for(plugin *p = plugin_list; p != NULL; p = p->next){
319
if(p->next == plugin_node){
320
p->next = plugin_node->next;
321
break;
322
}
323
}
324
}
325
326
free(plugin_node);
327
}
328
329
static void free_plugin_list(void){
330
while(plugin_list != NULL){
331
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);
332
264
}
333
265
}
334
266
342
274
struct stat st;
343
275
fd_set rfds_all;
344
276
int ret, maxfd = 0;
345
ssize_t sret;
346
277
uid_t uid = 65534;
347
278
gid_t gid = 65534;
348
279
bool debug = false;
358
289
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
290
if(ret == -1){
360
291
perror("sigaddset");
361
exitstatus = EX_OSERR;
292
exitstatus = EXIT_FAILURE;
362
293
goto fallback;
363
294
}
364
295
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
296
if(ret == -1){
366
297
perror("sigaction");
367
exitstatus = EX_OSERR;
298
exitstatus = EXIT_FAILURE;
368
299
goto fallback;
369
300
}
370
301
373
304
{ .name = "global-options", .key = 'g',
374
305
.arg = "OPTION[,OPTION[,...]]",
375
306
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
377
308
.arg = "VAR=value",
378
309
.doc = "Environment variable passed to all plugins" },
379
310
{ .name = "options-for", .key = 'o',
380
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
312
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
383
314
.arg = "PLUGIN:ENV=value",
384
315
.doc = "Environment variable passed to specified plugin" },
385
316
{ .name = "disable", .key = 'd',
386
317
.arg = "PLUGIN",
387
318
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
389
.arg = "PLUGIN",
390
.doc = "Enable a specific plugin", .group = 1 },
391
319
{ .name = "plugin-dir", .key = 128,
392
320
.arg = "DIRECTORY",
393
321
.doc = "Specify a different plugin directory", .group = 2 },
402
330
.doc = "Group ID the plugins will run as", .group = 3 },
403
331
{ .name = "debug", .key = 132,
404
332
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
414
333
{ .name = NULL }
415
334
};
416
335
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
422
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
428
}
429
}
430
}
431
break;
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
434
break;
435
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
454
}
455
}
456
}
457
break;
458
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
}
459
397
{
460
398
char *envdef = strchr(arg, ':');
461
399
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
467
406
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
add_environment(getplugin(arg), envdef, true);
474
}
475
break;
476
case 'd': /* --disable */
477
{
478
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
481
}
482
}
483
break;
484
case 'e': /* --enable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
489
}
490
}
491
break;
492
case 128: /* --plugin-dir */
493
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:
494
422
plugindir = strdup(arg);
495
break;
496
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
498
break;
499
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
508
break;
509
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
518
break;
519
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:
520
440
debug = true;
521
441
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
546
}
547
default:
548
return ARGP_ERR_UNKNOWN;
549
}
550
return errno; /* Set to 0 at start */
551
}
552
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
567
break;
568
case 129: /* --config-file */
569
free(argfile);
570
argfile = strdup(arg);
571
break;
572
case 130: /* --userid */
573
case 131: /* --groupid */
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
case ARGP_KEY_ARG:
579
break;
580
default:
581
return ARGP_ERR_UNKNOWN;
582
}
583
return errno;
584
}
585
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
588
.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]",
589
457
.doc = "Mandos plugin runner -- Run plugins" };
590
458
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
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;
607
463
goto fallback;
608
464
}
609
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
612
613
/* Open the configfile if available */
614
if(argfile == NULL){
465
466
if (argfile == NULL){
615
467
conffp = fopen(AFILE, "r");
616
468
} else {
617
469
conffp = fopen(argfile, "r");
618
470
}
471
619
472
if(conffp != NULL){
620
473
char *org_line = NULL;
621
474
char *p, *arg, *new_arg, *line;
622
475
size_t size = 0;
476
ssize_t sret;
623
477
const char whitespace_delims[] = " \r\t\f\v\n";
624
478
const char comment_delim[] = "#";
625
479
626
480
custom_argc = 1;
627
481
custom_argv = malloc(sizeof(char*) * 2);
628
482
if(custom_argv == NULL){
629
483
perror("malloc");
630
exitstatus = EX_OSERR;
484
exitstatus = EXIT_FAILURE;
631
485
goto fallback;
632
486
}
633
487
custom_argv[0] = argv[0];
634
488
custom_argv[1] = NULL;
635
489
636
/* for each line in the config file, strip whitespace and ignore
637
commented text */
638
490
while(true){
639
491
sret = getline(&org_line, &size, conffp);
640
492
if(sret == -1){
641
493
break;
642
494
}
643
495
644
496
line = org_line;
645
497
arg = strsep(&line, comment_delim);
646
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
502
new_arg = strdup(p);
651
503
if(new_arg == NULL){
652
504
perror("strdup");
653
exitstatus = EX_OSERR;
505
exitstatus = EXIT_FAILURE;
654
506
free(org_line);
655
507
goto fallback;
656
508
}
660
512
* ((unsigned int) custom_argc + 1));
661
513
if(custom_argv == NULL){
662
514
perror("realloc");
663
exitstatus = EX_OSERR;
515
exitstatus = EXIT_FAILURE;
664
516
free(org_line);
665
517
goto fallback;
666
518
}
667
519
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
669
521
}
670
522
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
523
free(org_line);
680
} else {
524
} else{
681
525
/* Check for harmful errors and go to fallback. Other errors might
682
526
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
528
perror("fopen");
685
exitstatus = EX_OSERR;
529
exitstatus = EXIT_FAILURE;
686
530
goto fallback;
687
531
}
688
532
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
533
691
534
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
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;
706
539
goto fallback;
707
540
}
708
541
}
709
542
710
/* Parse actual command line arguments, to let them override the
711
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
726
goto fallback;
727
}
728
729
543
if(debug){
730
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
731
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
733
547
for(char **a = p->argv; *a != NULL; a++){
734
548
fprintf(stderr, "\tArg: %s\n", *a);
735
549
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
551
for(char **a = p->environ; *a != NULL; a++){
738
552
fprintf(stderr, "\t%s\n", *a);
739
553
}
740
554
}
741
555
}
742
556
743
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
744
562
setgid(gid);
745
if(ret == -1){
563
if (ret == -1){
746
564
perror("setgid");
747
565
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
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 */
754
580
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
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
}
796
589
}
797
590
}
798
591
799
592
FD_ZERO(&rfds_all);
800
593
801
/* Read and execute any executable in the plugin directory*/
802
594
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
595
dirst = readdir(dir);
806
596
807
/* All directory entries have been processed */
597
// All directory entries have been processed
808
598
if(dirst == NULL){
809
if(errno == EBADF){
599
if (errno == EBADF){
810
600
perror("readdir");
811
exitstatus = EX_IOERR;
601
exitstatus = EXIT_FAILURE;
812
602
goto fallback;
813
603
}
814
604
break;
816
606
817
607
d_name_len = strlen(dirst->d_name);
818
608
819
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
820
610
{
821
611
bool bad_name = false;
822
612
824
614
825
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
616
".dpkg-old",
827
".dpkg-bak",
828
617
".dpkg-divert", NULL };
829
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
619
size_t pre_len = strlen(*pre);
838
627
break;
839
628
}
840
629
}
630
841
631
if(bad_name){
842
632
continue;
843
633
}
634
844
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
636
size_t suf_len = strlen(*suf);
846
637
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
639
== 0)){
849
640
if(debug){
850
641
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
650
continue;
860
651
}
861
652
}
862
653
863
654
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
872
656
if(ret < 0){
873
657
perror("asprintf");
874
658
continue;
875
659
}
876
660
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
661
ret = stat(filename, &st);
662
if (ret == -1){
879
663
perror("stat");
880
664
free(filename);
881
665
continue;
882
666
}
883
667
884
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
669
if(debug){
888
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
671
" with bad type or mode\n", filename);
891
673
free(filename);
892
674
continue;
893
675
}
894
895
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
896
677
if(p == NULL){
897
678
perror("getplugin");
898
679
free(filename);
908
689
}
909
690
{
910
691
/* Add global arguments to argument list for this plugin */
911
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
912
693
if(g != NULL){
913
694
for(char **a = g->argv + 1; *a != NULL; a++){
914
695
if(not add_argument(p, *a)){
917
698
}
918
699
/* Add global environment variables */
919
700
for(char **e = g->environ; *e != NULL; e++){
920
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
921
702
perror("add_environment");
922
703
}
923
704
}
928
709
process, too. */
929
710
if(p->environ[0] != NULL){
930
711
for(char **e = environ; *e != NULL; e++){
931
if(not add_environment(p, *e, false)){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
932
718
perror("add_environment");
933
719
}
934
720
}
935
721
}
936
722
937
723
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
724
ret = pipe(pipefd);
725
if (ret == -1){
940
726
perror("pipe");
941
exitstatus = EX_OSERR;
727
exitstatus = EXIT_FAILURE;
942
728
goto fallback;
943
729
}
944
/* Ask OS to automatic close the pipe on exec */
945
730
ret = set_cloexec_flag(pipefd[0]);
946
731
if(ret < 0){
947
732
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
733
exitstatus = EXIT_FAILURE;
949
734
goto fallback;
950
735
}
951
736
ret = set_cloexec_flag(pipefd[1]);
952
737
if(ret < 0){
953
738
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
739
exitstatus = EXIT_FAILURE;
955
740
goto fallback;
956
741
}
957
742
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
744
if(ret < 0){
962
745
perror("sigprocmask");
963
exitstatus = EX_OSERR;
746
exitstatus = EXIT_FAILURE;
964
747
goto fallback;
965
748
}
966
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
749
// Starting a new process to be watched
750
pid_t pid = fork();
971
751
if(pid == -1){
972
752
perror("fork");
973
exitstatus = EX_OSERR;
753
exitstatus = EXIT_FAILURE;
974
754
goto fallback;
975
755
}
976
756
if(pid == 0){
978
758
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
759
if(ret < 0){
980
760
perror("sigaction");
981
_exit(EX_OSERR);
761
_exit(EXIT_FAILURE);
982
762
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
764
if(ret < 0){
985
765
perror("sigprocmask");
986
_exit(EX_OSERR);
766
_exit(EXIT_FAILURE);
987
767
}
988
768
989
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
770
if(ret == -1){
991
771
perror("dup2");
992
_exit(EX_OSERR);
772
_exit(EXIT_FAILURE);
993
773
}
994
774
995
775
if(dirfd(dir) < 0){
1000
780
if(p->environ[0] == NULL){
1001
781
if(execv(filename, p->argv) < 0){
1002
782
perror("execv");
1003
_exit(EX_OSERR);
783
_exit(EXIT_FAILURE);
1004
784
}
1005
785
} else {
1006
786
if(execve(filename, p->argv, p->environ) < 0){
1007
787
perror("execve");
1008
_exit(EX_OSERR);
788
_exit(EXIT_FAILURE);
1009
789
}
1010
790
}
1011
791
/* no return */
1012
792
}
1013
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
793
/* parent process */
1016
794
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
1019
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
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);
1023
800
if(ret < 0){
1024
perror("sigprocmask");
801
perror("sigprocmask");
1025
802
}
1026
exitstatus = EX_OSERR;
803
exitstatus = EXIT_FAILURE;
1027
804
goto fallback;
1028
805
}
1029
806
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
1032
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1033
812
/* Unblock SIGCHLD so signal handler can be run if this process
1034
813
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
815
if(ret < 0){
1039
816
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
817
exitstatus = EXIT_FAILURE;
1041
818
goto fallback;
1042
819
}
1043
820
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
821
FD_SET(new_process->fd, &rfds_all);
1046
822
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1049
825
}
826
1050
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
1051
831
1052
TEMP_FAILURE_RETRY(closedir(dir));
832
closedir(dir);
1053
833
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
if(p->pid != 0){
1058
break;
1059
}
1060
if(p->next == NULL){
1061
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1062
" directory?\n");
1063
free_plugin_list();
1064
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1065
839
}
1066
1067
/* Main loop while running plugins exist */
1068
while(plugin_list){
840
while(process_list){
1069
841
fd_set rfds = rfds_all;
1070
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
843
if (select_ret == -1){
1072
844
perror("select");
1073
exitstatus = EX_OSERR;
845
exitstatus = EXIT_FAILURE;
1074
846
goto fallback;
1075
847
}
1076
848
/* OK, now either a process completed, or something can be read
1077
849
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
1079
851
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
1081
853
/* Only accept the plugin output if it exited cleanly */
1082
854
if(not WIFEXITED(proc->status)
1083
855
or WEXITSTATUS(proc->status) != 0){
1084
856
/* Bad exit by plugin */
1085
1086
857
if(debug){
1087
858
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1091
861
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
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));
1098
866
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1101
869
}
1102
870
}
1103
1104
871
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
872
FD_CLR(proc->fd, &rfds_all);
1108
873
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
875
if(ret < 0){
1114
876
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
877
exitstatus = EXIT_FAILURE;
1116
878
goto fallback;
1117
879
}
1118
1119
plugin *next_plugin = proc->next;
1120
free_plugin(proc);
1121
proc = next_plugin;
1122
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
}
1123
893
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1127
896
if(ret < 0){
1128
897
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1130
goto fallback;
1131
}
1132
1133
if(plugin_list == NULL){
1134
break;
1135
}
1136
1137
continue;
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;
1138
905
}
1139
1140
906
/* This process exited nicely, so print its buffer */
1141
907
1142
908
bool bret = print_out_password(proc->buffer,
1143
909
proc->buffer_length);
1144
910
if(not bret){
1145
911
perror("print_out_password");
1146
exitstatus = EX_IOERR;
912
exitstatus = EXIT_FAILURE;
1147
913
}
1148
914
goto fallback;
1149
915
}
1150
1151
916
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
918
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
919
continue;
1158
920
}
1159
921
/* Before reading, make the process' data buffer large enough */
1160
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
924
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1164
926
perror("malloc");
1165
exitstatus = EX_OSERR;
927
exitstatus = EXIT_FAILURE;
1166
928
goto fallback;
1167
929
}
1168
930
proc->buffer_size += BUFFER_SIZE;
1169
931
}
1170
932
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1176
936
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
937
continue;
1179
938
}
1180
if(sret == 0){
939
if(ret == 0){
1181
940
/* got EOF */
1182
941
proc->eof = true;
1183
942
} else {
1184
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1185
944
}
1186
945
}
1187
946
}
1188
1189
947
948
1190
949
fallback:
1191
950
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1194
952
/* Fallback if all plugins failed, none are found or an error
1195
953
occured */
1196
954
bool bret;
1197
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
956
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
len--;
1204
}
1205
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1206
958
if(not bret){
1207
959
perror("print_out_password");
1208
exitstatus = EX_IOERR;
960
exitstatus = EXIT_FAILURE;
1209
961
}
1210
962
}
1211
963
1213
965
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
966
if(ret == -1){
1215
967
perror("sigaction");
1216
exitstatus = EX_OSERR;
968
exitstatus = EXIT_FAILURE;
1217
969
}
1218
970
1219
971
if(custom_argv != NULL){
1220
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
973
free(*arg);
1222
974
}
1223
975
free(custom_argv);
1224
976
}
977
free_plugin_list(plugin_list);
1225
978
1226
979
if(dir != NULL){
1227
980
closedir(dir);
1228
981
}
1229
982
1230
/* Kill the processes */
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
if(p->pid != 0){
1233
close(p->fd);
1234
ret = kill(p->pid, SIGTERM);
1235
if(ret == -1 and errno != ESRCH){
1236
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1238
}
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");
1239
991
}
992
free(process_list->buffer);
993
free(process_list);
1240
994
}
1241
995
1242
996
/* Wait for any remaining child processes to terminate */
1243
do {
997
do{
1244
998
ret = wait(NULL);
1245
999
} while(ret >= 0);
1246
1000
if(errno != ECHILD){
1247
1001
perror("wait");
1248
1002
}
1249
1250
free_plugin_list();
1251
1003
1252
1004
free(plugindir);
1253
1005
free(argfile);
1254
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0