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- Committer: Teddy Hogeborn
- Date: 2008-08-01 20:03:03 UTC
- Revision ID: teddy@fukt.bsnet.se-20080801200303-3xjn9gjewg87365i
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
FD_CLOEXEC on the directory, if possible,
and also on both ends of the pipe. Do not
allocate buffer for process in advance.
Free the plugin list. Bug fix: exit if no
plugins found, not if any found. Set
"exitstatus" in many places. Simplify and
un-indent the loop reading process pipes.
Renamed process list iterator to "proc".
Bug fix: retry password write on EINTR.
Free the process list properly, including
the process structs themselves.
FD_CLOEXEC on the directory, if possible,
and also on both ends of the pipe. Do not
allocate buffer for process in advance.
Free the plugin list. Bug fix: exit if no
plugins found, not if any found. Set
"exitstatus" in many places. Simplify and
un-indent the loop reading process pipes.
Renamed process list iterator to "proc".
Bug fix: retry password write on EINTR.
Free the process list properly, including
the process structs themselves.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
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
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
32
27
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
45
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
readdir(), closedir(), dirfd() */
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
47
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
58
48
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
72
#define BUFFER_SIZE 256
73
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
52
53
struct process;
54
55
typedef struct process{
56
pid_t pid;
57
int fd;
58
char *buffer;
59
size_t buffer_size;
60
size_t buffer_length;
61
struct process *next;
62
} process;
79
63
80
64
typedef struct plugin{
81
65
char *name; /* can be NULL or any plugin name */
82
66
char **argv;
83
67
int argc;
84
char **environ;
85
int envc;
86
68
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
97
69
struct plugin *next;
98
70
} plugin;
99
71
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
72
plugin *getplugin(char *name, plugin **plugin_list){
73
for (plugin *p = *plugin_list; p != NULL; p = p->next){
74
if ((p->name == name)
75
or (p->name and name and (strcmp(p->name, name) == 0))){
109
76
return p;
110
77
}
111
78
}
112
79
/* Create a new plugin */
113
80
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
115
return NULL;
116
}
117
char *copy_name = NULL;
118
if(name != NULL){
119
copy_name = strdup(name);
120
if(copy_name == NULL){
121
free(new_plugin);
122
return NULL;
123
}
124
}
125
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
130
81
if (new_plugin == NULL){
82
perror("malloc");
83
exit(EXIT_FAILURE);
84
}
85
new_plugin->name = name;
131
86
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
133
free(copy_name);
134
free(new_plugin);
135
return NULL;
87
if (new_plugin->argv == NULL){
88
perror("malloc");
89
exit(EXIT_FAILURE);
136
90
}
137
new_plugin->argv[0] = copy_name;
91
new_plugin->argv[0] = name;
138
92
new_plugin->argv[1] = NULL;
139
140
new_plugin->environ = malloc(sizeof(char *));
141
if(new_plugin->environ == NULL){
142
free(copy_name);
143
free(new_plugin->argv);
144
free(new_plugin);
145
return NULL;
146
}
147
new_plugin->environ[0] = NULL;
148
93
new_plugin->argc = 1;
94
new_plugin->disabled = false;
95
new_plugin->next = *plugin_list;
149
96
/* Append the new plugin to the list */
150
plugin_list = new_plugin;
97
*plugin_list = new_plugin;
151
98
return new_plugin;
152
99
}
153
100
154
/* Helper function for add_argument and add_environment */
155
static bool add_to_char_array(const char *new, char ***array,
156
int *len){
157
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
160
/* Malloc check */
161
if(*array == NULL){
162
return false;
163
}
164
/* Make a copy of the new string */
165
char *copy = strdup(new);
166
if(copy == NULL){
167
return false;
168
}
169
/* Insert the copy */
170
(*array)[*len] = copy;
171
(*len)++;
172
/* Add a new terminating NULL pointer to the last element */
173
(*array)[*len] = NULL;
174
return true;
175
}
176
177
/* Add to a plugin's argument vector */
178
static bool add_argument(plugin *p, const char *arg){
179
if(p == NULL){
180
return false;
181
}
182
return add_to_char_array(arg, &(p->argv), &(p->argc));
183
}
184
185
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
187
if(p == NULL){
188
return false;
189
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
207
return add_to_char_array(def, &(p->environ), &(p->envc));
101
void addargument(plugin *p, char *arg){
102
p->argv[p->argc] = arg;
103
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
104
if (p->argv == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
p->argc++;
109
p->argv[p->argc] = NULL;
208
110
}
209
111
210
112
/*
212
114
* Descriptor Flags".
213
115
* *Note File Descriptor Flags:(libc)Descriptor Flags.
214
116
*/
215
static int set_cloexec_flag(int fd){
117
int set_cloexec_flag(int fd)
118
{
216
119
int ret = fcntl(fd, F_GETFD, 0);
217
120
/* If reading the flags failed, return error indication now. */
218
121
if(ret < 0){
223
126
}
224
127
225
128
226
/* Mark processes as completed when they exit, and save their exit
227
status. */
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
230
while(true){
231
plugin *proc = plugin_list;
232
int status;
233
pid_t pid = waitpid(-1, &status, WNOHANG);
234
if(pid == 0){
235
/* Only still running child processes */
236
break;
237
}
238
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
242
}
243
perror("waitpid");
244
}
245
246
/* A child exited, find it in process_list */
247
while(proc != NULL and proc->pid != pid){
248
proc = proc->next;
249
}
250
if(proc == NULL){
251
/* Process not found in process list */
252
continue;
253
}
254
proc->status = status;
255
proc->completed = 1;
256
}
257
errno = old_errno;
258
}
259
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
262
ssize_t ret;
263
for(size_t written = 0; written < length; written += (size_t)ret){
264
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
length - written));
266
if(ret < 0){
267
return false;
268
}
269
}
270
return true;
271
}
272
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
297
}
298
}
299
300
free(plugin_node);
301
}
302
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
306
}
307
}
129
#define BUFFER_SIZE 256
130
131
const char *argp_program_version =
132
"plugbasedclient 0.9";
133
const char *argp_program_bug_address =
134
"<mandos@fukt.bsnet.se>";
308
135
309
136
int main(int argc, char *argv[]){
310
char *plugindir = NULL;
311
char *argfile = NULL;
312
FILE *conffp;
137
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
313
138
size_t d_name_len;
314
DIR *dir = NULL;
139
DIR *dir;
315
140
struct dirent *dirst;
316
141
struct stat st;
317
142
fd_set rfds_all;
318
143
int ret, maxfd = 0;
319
ssize_t sret;
320
intmax_t tmpmax;
321
uid_t uid = 65534;
322
gid_t gid = 65534;
144
process *process_list = NULL;
323
145
bool debug = false;
324
146
int exitstatus = EXIT_SUCCESS;
325
struct sigaction old_sigchld_action;
326
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
327
.sa_flags = SA_NOCLDSTOP };
328
char **custom_argv = NULL;
329
int custom_argc = 0;
330
331
/* Establish a signal handler */
332
sigemptyset(&sigchld_action.sa_mask);
333
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
334
if(ret == -1){
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
338
}
339
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
340
if(ret == -1){
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
343
goto fallback;
344
}
345
147
346
148
/* The options we understand. */
347
149
struct argp_option options[] = {
348
150
{ .name = "global-options", .key = 'g',
349
151
.arg = "OPTION[,OPTION[,...]]",
350
152
.doc = "Options passed to all plugins" },
351
{ .name = "global-env", .key = 'G',
352
.arg = "VAR=value",
353
.doc = "Environment variable passed to all plugins" },
354
153
{ .name = "options-for", .key = 'o',
355
154
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
356
155
.doc = "Options passed only to specified plugin" },
357
{ .name = "env-for", .key = 'E',
358
.arg = "PLUGIN:ENV=value",
359
.doc = "Environment variable passed to specified plugin" },
360
156
{ .name = "disable", .key = 'd',
361
157
.arg = "PLUGIN",
362
158
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
366
159
{ .name = "plugin-dir", .key = 128,
367
160
.arg = "DIRECTORY",
368
161
.doc = "Specify a different plugin directory", .group = 2 },
369
{ .name = "config-file", .key = 129,
370
.arg = "FILE",
371
.doc = "Specify a different configuration file", .group = 2 },
372
{ .name = "userid", .key = 130,
373
.arg = "ID", .flags = 0,
374
.doc = "User ID the plugins will run as", .group = 3 },
375
{ .name = "groupid", .key = 131,
376
.arg = "ID", .flags = 0,
377
.doc = "Group ID the plugins will run as", .group = 3 },
378
{ .name = "debug", .key = 132,
379
.doc = "Debug mode", .group = 4 },
162
{ .name = "debug", .key = 129,
163
.doc = "Debug mode", .group = 3 },
380
164
{ .name = NULL }
381
165
};
382
166
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
386
switch(key){
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
397
}
398
}
399
}
400
break;
401
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
408
break;
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
break;
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
{
429
char *envdef = strchr(arg, ':');
430
if(envdef == NULL){
431
break;
432
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
436
}
437
}
438
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
444
}
445
p->disabled = true;
446
}
447
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
167
error_t parse_opt (int key, char *arg, struct argp_state *state) {
168
/* Get the INPUT argument from `argp_parse', which we
169
know is a pointer to our plugin list pointer. */
170
plugin **plugins = state->input;
171
switch (key) {
172
case 'g':
173
if (arg != NULL){
174
char *p = strtok(arg, ",");
175
do{
176
addargument(getplugin(NULL, plugins), p);
177
p = strtok(NULL, ",");
178
} while (p);
179
}
180
break;
181
case 'o':
182
if (arg != NULL){
183
char *name = strtok(arg, ":");
184
char *p = strtok(NULL, ":");
185
if(p){
186
p = strtok(p, ",");
187
do{
188
addargument(getplugin(name, plugins), p);
189
p = strtok(NULL, ",");
190
} while (p);
191
}
192
}
193
break;
194
case 'd':
195
if (arg != NULL){
196
getplugin(arg, plugins)->disabled = true;
197
}
198
break;
199
case 128:
200
plugindir = arg;
201
break;
202
case 129:
490
203
debug = true;
491
204
break;
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
205
case ARGP_KEY_ARG:
206
argp_usage (state);
207
break;
208
case ARGP_KEY_END:
209
break;
210
default:
211
return ARGP_ERR_UNKNOWN;
212
}
213
return 0;
214
}
215
216
plugin *plugin_list = NULL;
217
218
struct argp argp = { .options = options, .parser = parse_opt,
547
219
.args_doc = "",
548
220
.doc = "Mandos plugin runner -- Run plugins" };
549
221
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
554
fprintf(stderr, "Unknown error while parsing arguments\n");
555
exitstatus = EXIT_FAILURE;
556
goto fallback;
557
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
568
if(conffp != NULL){
569
char *org_line = NULL;
570
char *p, *arg, *new_arg, *line;
571
size_t size = 0;
572
const char whitespace_delims[] = " \r\t\f\v\n";
573
const char comment_delim[] = "#";
574
575
custom_argc = 1;
576
custom_argv = malloc(sizeof(char*) * 2);
577
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
custom_argv[0] = argv[0];
583
custom_argv[1] = NULL;
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
587
while(true){
588
sret = getline(&org_line, &size, conffp);
589
if(sret == -1){
590
break;
591
}
592
593
line = org_line;
594
arg = strsep(&line, comment_delim);
595
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
if(p[0] == '\0'){
597
continue;
598
}
599
new_arg = strdup(p);
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
607
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
615
}
616
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
618
}
619
}
620
free(org_line);
621
} else {
622
/* Check for harmful errors and go to fallback. Other errors might
623
not affect opening plugins */
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
perror("fopen");
626
exitstatus = EXIT_FAILURE;
627
goto fallback;
628
}
629
}
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
632
if(custom_argv != NULL){
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
0, NULL);
635
if(ret == ARGP_ERR_UNKNOWN){
636
fprintf(stderr, "Unknown error while parsing arguments\n");
637
exitstatus = EXIT_FAILURE;
638
goto fallback;
639
}
640
}
641
642
/* Parse actual command line arguments, to let them override the
643
config file */
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
648
goto fallback;
649
}
222
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
650
223
651
224
if(debug){
652
225
for(plugin *p = plugin_list; p != NULL; p=p->next){
655
228
for(char **a = p->argv; *a != NULL; a++){
656
229
fprintf(stderr, "\tArg: %s\n", *a);
657
230
}
658
fprintf(stderr, "...and %d environment variables\n", p->envc);
659
for(char **a = p->environ; *a != NULL; a++){
660
fprintf(stderr, "\t%s\n", *a);
661
}
662
231
}
663
232
}
664
233
665
/* Strip permissions down to nobody */
666
setgid(gid);
667
if(ret == -1){
668
perror("setgid");
669
}
670
ret = setuid(uid);
671
if(ret == -1){
672
perror("setuid");
673
}
674
675
if(plugindir == NULL){
676
dir = opendir(PDIR);
677
} else {
678
dir = opendir(plugindir);
679
}
680
234
dir = opendir(plugindir);
681
235
if(dir == NULL){
682
236
perror("Could not open plugin dir");
683
237
exitstatus = EXIT_FAILURE;
684
goto fallback;
238
goto end;
685
239
}
686
687
240
/* Set the FD_CLOEXEC flag on the directory, if possible */
688
241
{
689
242
int dir_fd = dirfd(dir);
692
245
if(ret < 0){
693
246
perror("set_cloexec_flag");
694
247
exitstatus = EXIT_FAILURE;
695
goto fallback;
248
goto end;
696
249
}
697
250
}
698
251
}
699
252
253
if(dir == NULL){
254
fprintf(stderr, "Can not open directory\n");
255
return EXIT_FAILURE;
256
}
257
700
258
FD_ZERO(&rfds_all);
701
259
702
/* Read and execute any executable in the plugin directory*/
703
260
while(true){
704
261
dirst = readdir(dir);
705
262
706
/* All directory entries have been processed */
263
// All directory entries have been processed
707
264
if(dirst == NULL){
708
if(errno == EBADF){
709
perror("readdir");
710
exitstatus = EXIT_FAILURE;
711
goto fallback;
712
}
713
265
break;
714
266
}
715
267
716
268
d_name_len = strlen(dirst->d_name);
717
269
718
/* Ignore dotfiles, backup files and other junk */
270
// Ignore dotfiles, backup files and other junk
719
271
{
720
272
bool bad_name = false;
721
273
723
275
724
276
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
725
277
".dpkg-old",
726
".dpkg-bak",
727
278
".dpkg-divert", NULL };
728
279
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
729
280
size_t pre_len = strlen(*pre);
737
288
break;
738
289
}
739
290
}
291
740
292
if(bad_name){
741
293
continue;
742
294
}
295
743
296
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
744
297
size_t suf_len = strlen(*suf);
745
298
if((d_name_len >= suf_len)
759
312
}
760
313
}
761
314
762
char *filename;
763
if(plugindir == NULL){
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
765
} else {
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
}
768
if(ret < 0){
769
perror("asprintf");
770
continue;
771
}
772
773
ret = stat(filename, &st);
774
if(ret == -1){
775
perror("stat");
776
free(filename);
777
continue;
778
}
779
780
/* Ignore non-executable files */
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
315
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
316
if (filename == NULL){
317
perror("malloc");
318
exitstatus = EXIT_FAILURE;
319
goto end;
320
}
321
strcpy(filename, plugindir);
322
strcat(filename, "/");
323
strcat(filename, dirst->d_name);
324
325
stat(filename, &st);
326
327
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
782
328
if(debug){
783
329
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
784
330
" with bad type or mode\n", filename);
785
331
}
786
free(filename);
787
continue;
788
}
789
790
plugin *p = getplugin(dirst->d_name);
791
if(p == NULL){
792
perror("getplugin");
793
free(filename);
794
continue;
795
}
796
if(p->disabled){
332
continue;
333
}
334
if(getplugin(dirst->d_name, &plugin_list)->disabled){
797
335
if(debug){
798
336
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
799
337
dirst->d_name);
800
338
}
801
free(filename);
802
339
continue;
803
340
}
341
plugin *p = getplugin(dirst->d_name, &plugin_list);
804
342
{
805
343
/* Add global arguments to argument list for this plugin */
806
plugin *g = getplugin(NULL);
807
if(g != NULL){
808
for(char **a = g->argv + 1; *a != NULL; a++){
809
if(not add_argument(p, *a)){
810
perror("add_argument");
811
}
812
}
813
/* Add global environment variables */
814
for(char **e = g->environ; *e != NULL; e++){
815
if(not add_environment(p, *e, false)){
816
perror("add_environment");
817
}
818
}
819
}
820
}
821
/* If this plugin has any environment variables, we will call
822
using execve and need to duplicate the environment from this
823
process, too. */
824
if(p->environ[0] != NULL){
825
for(char **e = environ; *e != NULL; e++){
826
if(not add_environment(p, *e, false)){
827
perror("add_environment");
828
}
829
}
830
}
831
832
int pipefd[2];
344
plugin *g = getplugin(NULL, &plugin_list);
345
for(char **a = g->argv + 1; *a != NULL; a++){
346
addargument(p, *a);
347
}
348
}
349
int pipefd[2];
833
350
ret = pipe(pipefd);
834
if(ret == -1){
351
if (ret == -1){
835
352
perror("pipe");
836
353
exitstatus = EXIT_FAILURE;
837
goto fallback;
354
goto end;
838
355
}
839
/* Ask OS to automatic close the pipe on exec */
840
356
ret = set_cloexec_flag(pipefd[0]);
841
357
if(ret < 0){
842
358
perror("set_cloexec_flag");
843
359
exitstatus = EXIT_FAILURE;
844
goto fallback;
360
goto end;
845
361
}
846
362
ret = set_cloexec_flag(pipefd[1]);
847
363
if(ret < 0){
848
364
perror("set_cloexec_flag");
849
365
exitstatus = EXIT_FAILURE;
850
goto fallback;
851
}
852
/* Block SIGCHLD until process is safely in process list */
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
if(ret < 0){
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
857
goto fallback;
858
}
859
/* Starting a new process to be watched */
366
goto end;
367
}
368
// Starting a new process to be watched
860
369
pid_t pid = fork();
861
if(pid == -1){
862
perror("fork");
863
exitstatus = EXIT_FAILURE;
864
goto fallback;
865
}
866
370
if(pid == 0){
867
371
/* this is the child process */
868
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
869
if(ret < 0){
870
perror("sigaction");
871
_exit(EXIT_FAILURE);
872
}
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
if(ret < 0){
875
perror("sigprocmask");
876
_exit(EXIT_FAILURE);
877
}
878
879
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
if(ret == -1){
881
perror("dup2");
882
_exit(EXIT_FAILURE);
883
}
372
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
884
373
885
374
if(dirfd(dir) < 0){
886
375
/* If dir has no file descriptor, we could not set FD_CLOEXEC
887
above and must now close it manually here. */
376
and must close it manually */
888
377
closedir(dir);
889
378
}
890
if(p->environ[0] == NULL){
891
if(execv(filename, p->argv) < 0){
892
perror("execv");
893
_exit(EXIT_FAILURE);
894
}
895
} else {
896
if(execve(filename, p->argv, p->environ) < 0){
897
perror("execve");
898
_exit(EXIT_FAILURE);
899
}
379
if(execv(filename, p->argv) < 0){
380
perror("execv");
381
_exit(EXIT_FAILURE);
900
382
}
901
383
/* no return */
902
384
}
903
/* Parent process */
904
close(pipefd[1]); /* Close unused write end of pipe */
905
free(filename);
906
plugin *new_plugin = getplugin(dirst->d_name);
907
if(new_plugin == NULL){
908
perror("getplugin");
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
if(ret < 0){
911
perror("sigprocmask");
912
}
913
exitstatus = EXIT_FAILURE;
914
goto fallback;
915
}
916
917
new_plugin->pid = pid;
918
new_plugin->fd = pipefd[0];
919
920
/* Unblock SIGCHLD so signal handler can be run if this process
921
has already completed */
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
if(ret < 0){
924
perror("sigprocmask");
925
exitstatus = EXIT_FAILURE;
926
goto fallback;
927
}
928
929
FD_SET(new_plugin->fd, &rfds_all);
930
931
if(maxfd < new_plugin->fd){
932
maxfd = new_plugin->fd;
933
}
385
/* parent process */
386
close(pipefd[1]); /* close unused write end of pipe */
387
process *new_process = malloc(sizeof(process));
388
if (new_process == NULL){
389
perror("malloc");
390
exitstatus = EXIT_FAILURE;
391
goto end;
392
}
393
394
*new_process = (struct process){ .pid = pid,
395
.fd = pipefd[0],
396
.next = process_list };
397
FD_SET(new_process->fd, &rfds_all);
398
399
if (maxfd < new_process->fd){
400
maxfd = new_process->fd;
401
}
402
403
//List handling
404
process_list = new_process;
405
}
406
407
/* Free the plugin list */
408
for(plugin *next; plugin_list != NULL; plugin_list = next){
409
next = plugin_list->next;
410
free(plugin_list->argv);
411
free(plugin_list);
934
412
}
935
413
936
414
closedir(dir);
937
dir = NULL;
938
free_plugin(getplugin(NULL));
939
415
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
416
if (process_list == NULL){
417
fprintf(stderr, "No plugin processes started, exiting\n");
418
return EXIT_FAILURE;
949
419
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
420
while(true){
953
421
fd_set rfds = rfds_all;
954
422
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
423
if (select_ret == -1){
956
424
perror("select");
957
425
exitstatus = EXIT_FAILURE;
958
goto fallback;
426
goto end;
959
427
}
960
/* OK, now either a process completed, or something can be read
961
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
963
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
965
/* Only accept the plugin output if it exited cleanly */
966
if(not WIFEXITED(proc->status)
967
or WEXITSTATUS(proc->status) != 0){
968
/* Bad exit by plugin */
969
970
if(debug){
971
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
975
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d: %s\n", proc->name,
979
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status),
981
strsignal(WTERMSIG(proc->status)));
982
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
985
}
986
}
987
988
/* Remove the plugin */
989
FD_CLR(proc->fd, &rfds_all);
990
991
/* Block signal while modifying process_list */
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
if(ret < 0){
994
perror("sigprocmask");
995
exitstatus = EXIT_FAILURE;
996
goto fallback;
997
}
998
999
plugin *next_plugin = proc->next;
1000
free_plugin(proc);
1001
proc = next_plugin;
1002
1003
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1006
if(ret < 0){
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1009
goto fallback;
1010
}
1011
1012
if(plugin_list == NULL){
1013
break;
1014
}
1015
1016
continue;
1017
}
1018
1019
/* This process exited nicely, so print its buffer */
1020
1021
bool bret = print_out_password(proc->buffer,
1022
proc->buffer_length);
1023
if(not bret){
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1026
}
1027
goto fallback;
1028
}
1029
1030
/* This process has not completed. Does it have any output? */
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1032
/* This process had nothing to say at this time */
1033
proc = proc->next;
428
for(process *proc = process_list; proc ; proc = proc->next){
429
if(not FD_ISSET(proc->fd, &rfds)){
1034
430
continue;
1035
431
}
1036
/* Before reading, make the process' data buffer large enough */
1037
432
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1038
433
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
434
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
435
if (proc->buffer == NULL){
1041
436
perror("malloc");
1042
437
exitstatus = EXIT_FAILURE;
1043
goto fallback;
438
goto end;
1044
439
}
1045
440
proc->buffer_size += BUFFER_SIZE;
1046
441
}
1047
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1050
if(sret < 0){
1051
/* Read error from this process; ignore the error */
1052
proc = proc->next;
442
ret = read(proc->fd, proc->buffer + proc->buffer_length,
443
BUFFER_SIZE);
444
if(ret < 0){
445
/* Read error from this process; ignore it */
1053
446
continue;
1054
447
}
1055
if(sret == 0){
448
proc->buffer_length += (size_t) ret;
449
if(ret == 0){
1056
450
/* got EOF */
1057
proc->eof = true;
1058
} else {
1059
proc->buffer_length += (size_t) sret;
1060
}
1061
}
1062
}
1063
1064
1065
fallback:
1066
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1068
/* Fallback if all plugins failed, none are found or an error
1069
occured */
1070
bool bret;
1071
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1072
char *passwordbuffer = getpass("Password: ");
1073
size_t len = strlen(passwordbuffer);
1074
/* Strip trailing newline */
1075
if(len > 0 and passwordbuffer[len-1] == '\n'){
1076
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1077
len--;
1078
}
1079
bret = print_out_password(passwordbuffer, len);
1080
if(not bret){
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1083
}
1084
}
1085
1086
/* Restore old signal handler */
1087
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1088
if(ret == -1){
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1091
}
1092
1093
if(custom_argv != NULL){
1094
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1095
free(*arg);
1096
}
1097
free(custom_argv);
1098
}
1099
1100
if(dir != NULL){
1101
closedir(dir);
1102
}
1103
1104
/* Kill the processes */
1105
for(plugin *p = plugin_list; p != NULL; p = p->next){
1106
if(p->pid != 0){
1107
close(p->fd);
1108
ret = kill(p->pid, SIGTERM);
1109
if(ret == -1 and errno != ESRCH){
1110
/* Set-uid proccesses might not get closed */
1111
perror("kill");
1112
}
1113
}
1114
}
1115
1116
/* Wait for any remaining child processes to terminate */
1117
do{
1118
ret = wait(NULL);
1119
} while(ret >= 0);
1120
if(errno != ECHILD){
1121
perror("wait");
1122
}
1123
1124
free_plugin_list();
1125
1126
free(plugindir);
1127
free(argfile);
1128
451
/* wait for process exit */
452
int status;
453
waitpid(proc->pid, &status, 0);
454
if(not WIFEXITED(status) or WEXITSTATUS(status) != 0){
455
FD_CLR(proc->fd, &rfds_all);
456
continue;
457
}
458
for(size_t written = 0;
459
written < proc->buffer_length; written += (size_t)ret){
460
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
461
proc->buffer + written,
462
proc->buffer_length
463
- written));
464
if(ret < 0){
465
perror("write");
466
exitstatus = EXIT_FAILURE;
467
goto end;
468
}
469
}
470
goto end;
471
}
472
}
473
}
474
475
end:
476
for(process *next; process_list != NULL; process_list = next){
477
close(process_list->fd);
478
kill(process_list->pid, SIGTERM);
479
free(process_list->buffer);
480
free(process_list);
481
}
482
483
while(true){
484
int status;
485
ret = wait(&status);
486
if (ret == -1){
487
if(errno != ECHILD){
488
perror("wait");
489
}
490
break;
491
}
492
}
1129
493
return exitstatus;
1130
494
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0