To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.55
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.55
- Committer: Björn Påhlsson
- Date: 2008-08-16 20:31:21 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816203121-u3uavdi14y1xjj0b
updated some partial manual pages
- files added:
- network-protocol.txt
- 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:
- Makefile
added
removed
plugin-runner.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
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
63
SIG_UNBLOCK, kill() */
66
64
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
65
69
66
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
75
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
79
88
char **argv;
81
90
char **environ;
82
91
int envc;
83
92
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile sig_atomic_t completed;
93
int status;
94
93
struct plugin *next;
95
94
} plugin;
96
95
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
106
100
return p;
107
101
}
108
102
}
109
103
/* Create a new plugin */
110
104
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
free(new_plugin);
119
return NULL;
120
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
121
111
}
122
112
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
127
118
128
119
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
120
if (new_plugin->argv == NULL){
131
121
free(new_plugin);
132
122
return NULL;
133
123
}
134
124
new_plugin->argv[0] = copy_name;
135
125
new_plugin->argv[1] = NULL;
136
126
137
127
new_plugin->environ = malloc(sizeof(char *));
138
128
if(new_plugin->environ == NULL){
139
free(copy_name);
140
129
free(new_plugin->argv);
141
130
free(new_plugin);
142
131
return NULL;
143
132
}
144
133
new_plugin->environ[0] = NULL;
145
146
134
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
148
136
return new_plugin;
149
137
}
150
138
180
168
}
181
169
182
170
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
184
172
if(p == NULL){
185
173
return false;
186
174
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
175
return add_to_char_array(def, &(p->environ), &(p->envc));
205
176
}
206
177
178
207
179
/*
208
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
181
* Descriptor Flags".
210
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
183
*/
212
static int set_cloexec_flag(int fd){
184
static int set_cloexec_flag(int fd)
185
{
213
186
int ret = fcntl(fd, F_GETFD, 0);
214
187
/* If reading the flags failed, return error indication now. */
215
188
if(ret < 0){
219
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
193
}
221
194
195
process *process_list = NULL;
222
196
223
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
224
198
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
227
while(true){
228
plugin *proc = plugin_list;
229
int status;
230
pid_t pid = waitpid(-1, &status, WNOHANG);
231
if(pid == 0){
232
/* Only still running child processes */
233
break;
234
}
235
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
239
}
240
perror("waitpid");
241
}
242
243
/* A child exited, find it in process_list */
244
while(proc != NULL and proc->pid != pid){
245
proc = proc->next;
246
}
247
if(proc == NULL){
248
/* Process not found in process list */
249
continue;
250
}
251
proc->status = status;
252
proc->completed = 1;
253
}
254
errno = old_errno;
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
255
216
}
256
217
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
259
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
260
223
for(size_t written = 0; written < length; written += (size_t)ret){
261
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
225
length - written));
267
230
return true;
268
231
}
269
232
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
294
239
}
295
}
296
297
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
298
252
}
299
253
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
303
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
304
268
}
305
269
306
270
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
309
273
FILE *conffp;
310
274
size_t d_name_len;
311
275
DIR *dir = NULL;
312
276
struct dirent *dirst;
313
277
struct stat st;
314
278
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
279
int ret, maxfd = 0;
318
280
uid_t uid = 65534;
319
281
gid_t gid = 65534;
320
282
bool debug = false;
336
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
299
if(ret == -1){
338
300
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
340
302
goto fallback;
341
303
}
342
304
345
307
{ .name = "global-options", .key = 'g',
346
308
.arg = "OPTION[,OPTION[,...]]",
347
309
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
349
311
.arg = "VAR=value",
350
312
.doc = "Environment variable passed to all plugins" },
351
313
{ .name = "options-for", .key = 'o',
352
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
315
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
355
317
.arg = "PLUGIN:ENV=value",
356
318
.doc = "Environment variable passed to specified plugin" },
357
319
{ .name = "disable", .key = 'd',
358
320
.arg = "PLUGIN",
359
321
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
322
{ .name = "plugin-dir", .key = 128,
364
323
.arg = "DIRECTORY",
365
324
.doc = "Specify a different plugin directory", .group = 2 },
366
{ .name = "config-file", .key = 129,
367
.arg = "FILE",
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
377
333
{ .name = NULL }
378
334
};
379
335
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
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){
385
343
char *p;
386
344
while((p = strsep(&arg, ",")) != NULL){
387
345
if(p[0] == '\0'){
388
346
continue;
389
347
}
390
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
391
349
perror("add_argument");
392
350
return ARGP_ERR_UNKNOWN;
393
351
}
394
352
}
395
353
}
396
354
break;
397
case 'G': /* --global-env */
355
case 'e':
398
356
if(arg == NULL){
399
357
break;
400
358
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
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
}
403
367
}
404
368
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
369
case 'o':
370
if (arg != NULL){
407
371
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
409
373
break;
410
374
}
411
375
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
413
377
break;
414
378
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
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
}
423
389
}
424
390
}
425
391
}
426
392
break;
427
case 'E': /* --env-for */
393
case 'f':
428
394
if(arg == NULL){
429
395
break;
430
396
}
433
399
if(envdef == NULL){
434
400
break;
435
401
}
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
438
408
perror("add_environment");
439
409
}
440
410
}
441
411
break;
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
445
415
if(p == NULL){
446
416
return ARGP_ERR_UNKNOWN;
447
417
}
448
418
p->disabled = true;
449
419
}
450
420
break;
451
case 'e': /* --enable */
452
if(arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = false;
458
}
459
break;
460
case 128: /* --plugin-dir */
461
free(plugindir);
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
469
break;
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
478
}
479
break;
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
488
}
489
break;
490
case 132: /* --debug */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
491
431
debug = true;
492
432
break;
493
/*
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
496
*/
497
case ARGP_KEY_ARG:
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
default:
508
return ARGP_ERR_UNKNOWN;
509
}
510
return 0;
511
}
512
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
518
switch(key){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
526
break;
527
case 129: /* --config-file */
528
free(argfile);
529
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
break;
540
default:
541
return ARGP_ERR_UNKNOWN;
542
}
543
return 0;
544
}
545
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
548
.args_doc = "",
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
549
448
.doc = "Mandos plugin runner -- Run plugins" };
550
449
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
555
452
fprintf(stderr, "Unknown error while parsing arguments\n");
556
453
exitstatus = EXIT_FAILURE;
557
454
goto fallback;
558
455
}
559
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
562
563
/* Open the configfile if available */
564
if(argfile == NULL){
565
conffp = fopen(AFILE, "r");
566
} else {
567
conffp = fopen(argfile, "r");
568
}
456
457
conffp = fopen(argfile, "r");
569
458
if(conffp != NULL){
570
459
char *org_line = NULL;
571
460
char *p, *arg, *new_arg, *line;
572
461
size_t size = 0;
462
ssize_t sret;
573
463
const char whitespace_delims[] = " \r\t\f\v\n";
574
464
const char comment_delim[] = "#";
575
465
576
custom_argc = 1;
577
custom_argv = malloc(sizeof(char*) * 2);
578
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
581
goto fallback;
582
}
583
custom_argv[0] = argv[0];
584
custom_argv[1] = NULL;
585
586
/* for each line in the config file, strip whitespace and ignore
587
commented text */
588
466
while(true){
589
467
sret = getline(&org_line, &size, conffp);
590
468
if(sret == -1){
598
476
continue;
599
477
}
600
478
new_arg = strdup(p);
601
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
604
free(org_line);
605
goto fallback;
606
}
607
608
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
616
}
617
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
619
485
}
620
486
}
621
487
free(org_line);
622
} else {
488
} else{
623
489
/* Check for harmful errors and go to fallback. Other errors might
624
490
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
492
perror("fopen");
627
493
exitstatus = EXIT_FAILURE;
628
494
goto fallback;
629
495
}
630
496
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
497
633
498
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
637
502
fprintf(stderr, "Unknown error while parsing arguments\n");
638
503
exitstatus = EXIT_FAILURE;
639
504
goto fallback;
640
505
}
641
506
}
642
507
643
/* Parse actual command line arguments, to let them override the
644
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
650
}
651
652
508
if(debug){
653
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
654
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
656
512
for(char **a = p->argv; *a != NULL; a++){
657
513
fprintf(stderr, "\tArg: %s\n", *a);
658
514
}
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
660
516
for(char **a = p->environ; *a != NULL; a++){
661
517
fprintf(stderr, "\t%s\n", *a);
662
518
}
663
519
}
664
520
}
665
521
666
/* Strip permissions down to nobody */
522
ret = setuid(uid);
523
if (ret == -1){
524
perror("setuid");
525
}
526
667
527
setgid(gid);
668
if(ret == -1){
528
if (ret == -1){
669
529
perror("setgid");
670
530
}
671
ret = setuid(uid);
672
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
531
532
dir = opendir(plugindir);
682
533
if(dir == NULL){
683
534
perror("Could not open plugin dir");
684
535
exitstatus = EXIT_FAILURE;
700
551
701
552
FD_ZERO(&rfds_all);
702
553
703
/* Read and execute any executable in the plugin directory*/
704
554
while(true){
705
555
dirst = readdir(dir);
706
556
707
/* All directory entries have been processed */
557
// All directory entries have been processed
708
558
if(dirst == NULL){
709
if(errno == EBADF){
559
if (errno == EBADF){
710
560
perror("readdir");
711
561
exitstatus = EXIT_FAILURE;
712
562
goto fallback;
716
566
717
567
d_name_len = strlen(dirst->d_name);
718
568
719
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
720
570
{
721
571
bool bad_name = false;
722
572
724
574
725
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
576
".dpkg-old",
727
".dpkg-bak",
728
577
".dpkg-divert", NULL };
729
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
579
size_t pre_len = strlen(*pre);
738
587
break;
739
588
}
740
589
}
590
741
591
if(bad_name){
742
592
continue;
743
593
}
594
744
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
596
size_t suf_len = strlen(*suf);
746
597
if((d_name_len >= suf_len)
761
612
}
762
613
763
614
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
769
616
if(ret < 0){
770
617
perror("asprintf");
771
618
continue;
772
619
}
773
620
774
621
ret = stat(filename, &st);
775
if(ret == -1){
622
if (ret == -1){
776
623
perror("stat");
777
624
free(filename);
778
625
continue;
779
626
}
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
627
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
783
629
if(debug){
784
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
631
" with bad type or mode\n", filename);
787
633
free(filename);
788
634
continue;
789
635
}
790
791
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
792
637
if(p == NULL){
793
638
perror("getplugin");
794
639
free(filename);
804
649
}
805
650
{
806
651
/* Add global arguments to argument list for this plugin */
807
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
808
653
if(g != NULL){
809
654
for(char **a = g->argv + 1; *a != NULL; a++){
810
655
if(not add_argument(p, *a)){
813
658
}
814
659
/* Add global environment variables */
815
660
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
817
662
perror("add_environment");
818
663
}
819
664
}
824
669
process, too. */
825
670
if(p->environ[0] != NULL){
826
671
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
828
678
perror("add_environment");
829
679
}
830
680
}
831
681
}
832
682
833
int pipefd[2];
683
int pipefd[2];
834
684
ret = pipe(pipefd);
835
if(ret == -1){
685
if (ret == -1){
836
686
perror("pipe");
837
687
exitstatus = EXIT_FAILURE;
838
688
goto fallback;
839
689
}
840
/* Ask OS to automatic close the pipe on exec */
841
690
ret = set_cloexec_flag(pipefd[0]);
842
691
if(ret < 0){
843
692
perror("set_cloexec_flag");
851
700
goto fallback;
852
701
}
853
702
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
855
704
if(ret < 0){
856
705
perror("sigprocmask");
857
706
exitstatus = EXIT_FAILURE;
858
707
goto fallback;
859
708
}
860
/* Starting a new process to be watched */
709
// Starting a new process to be watched
861
710
pid_t pid = fork();
862
711
if(pid == -1){
863
712
perror("fork");
871
720
perror("sigaction");
872
721
_exit(EXIT_FAILURE);
873
722
}
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
724
if(ret < 0){
876
725
perror("sigprocmask");
877
726
_exit(EXIT_FAILURE);
878
727
}
879
728
880
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
730
if(ret == -1){
882
731
perror("dup2");
901
750
}
902
751
/* no return */
903
752
}
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
906
754
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
760
if(ret < 0){
912
perror("sigprocmask");
761
perror("sigprocmask");
913
762
}
914
763
exitstatus = EXIT_FAILURE;
915
764
goto fallback;
916
765
}
917
766
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
921
772
/* Unblock SIGCHLD so signal handler can be run if this process
922
773
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
924
775
if(ret < 0){
925
776
perror("sigprocmask");
926
777
exitstatus = EXIT_FAILURE;
927
778
goto fallback;
928
779
}
929
780
930
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
931
782
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
934
785
}
786
935
787
}
936
788
789
free_plugin_list(plugin_list);
790
937
791
closedir(dir);
938
792
dir = NULL;
939
free_plugin(getplugin(NULL));
940
941
for(plugin *p = plugin_list; p != NULL; p = p->next){
942
if(p->pid != 0){
943
break;
944
}
945
if(p->next == NULL){
946
fprintf(stderr, "No plugin processes started. Incorrect plugin"
947
" directory?\n");
948
free_plugin_list();
949
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
950
798
}
951
952
/* Main loop while running plugins exist */
953
while(plugin_list){
799
while(process_list){
954
800
fd_set rfds = rfds_all;
955
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
956
if(select_ret == -1){
802
if (select_ret == -1){
957
803
perror("select");
958
804
exitstatus = EXIT_FAILURE;
959
805
goto fallback;
960
806
}
961
807
/* OK, now either a process completed, or something can be read
962
808
from one of them */
963
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
964
810
/* Is this process completely done? */
965
if(proc->completed and proc->eof){
811
if(proc->eof and proc->completed){
966
812
/* Only accept the plugin output if it exited cleanly */
967
813
if(not WIFEXITED(proc->status)
968
814
or WEXITSTATUS(proc->status) != 0){
969
815
/* Bad exit by plugin */
970
971
816
if(debug){
972
817
if(WIFEXITED(proc->status)){
973
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
974
" %d\n", (intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
975
820
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
978
" %d\n", (intmax_t) (proc->pid),
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
979
824
WTERMSIG(proc->status));
980
825
} else if(WCOREDUMP(proc->status)){
981
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
982
(intmax_t) (proc->pid));
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
983
828
}
984
829
}
985
986
830
/* Remove the plugin */
987
831
FD_CLR(proc->fd, &rfds_all);
988
989
832
/* Block signal while modifying process_list */
990
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
834
if(ret < 0){
992
835
perror("sigprocmask");
993
836
exitstatus = EXIT_FAILURE;
994
837
goto fallback;
995
838
}
996
997
plugin *next_plugin = proc->next;
998
free_plugin(proc);
999
proc = next_plugin;
1000
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
1001
852
/* We are done modifying process list, so unblock signal */
1002
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1003
NULL);
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1004
855
if(ret < 0){
1005
856
perror("sigprocmask");
1006
exitstatus = EXIT_FAILURE;
1007
goto fallback;
1008
}
1009
1010
if(plugin_list == NULL){
1011
break;
1012
}
1013
1014
continue;
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1015
864
}
1016
1017
865
/* This process exited nicely, so print its buffer */
1018
1019
bool bret = print_out_password(proc->buffer,
1020
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1021
868
if(not bret){
1022
869
perror("print_out_password");
1023
870
exitstatus = EXIT_FAILURE;
1024
871
}
1025
872
goto fallback;
1026
873
}
1027
1028
874
/* This process has not completed. Does it have any output? */
1029
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1030
876
/* This process had nothing to say at this time */
1031
proc = proc->next;
1032
877
continue;
1033
878
}
1034
879
/* Before reading, make the process' data buffer large enough */
1035
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1036
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
1037
882
+ (size_t) BUFFER_SIZE);
1038
if(proc->buffer == NULL){
883
if (proc->buffer == NULL){
1039
884
perror("malloc");
1040
885
exitstatus = EXIT_FAILURE;
1041
886
goto fallback;
1043
888
proc->buffer_size += BUFFER_SIZE;
1044
889
}
1045
890
/* Read from the process */
1046
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1047
BUFFER_SIZE);
1048
if(sret < 0){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1049
894
/* Read error from this process; ignore the error */
1050
proc = proc->next;
1051
895
continue;
1052
896
}
1053
if(sret == 0){
897
if(ret == 0){
1054
898
/* got EOF */
1055
899
proc->eof = true;
1056
900
} else {
1057
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1058
902
}
1059
903
}
1060
904
}
1062
906
1063
907
fallback:
1064
908
1065
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1066
/* Fallback if all plugins failed, none are found or an error
1067
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1068
911
bool bret;
1069
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1070
913
char *passwordbuffer = getpass("Password: ");
1071
size_t len = strlen(passwordbuffer);
1072
/* Strip trailing newline */
1073
if(len > 0 and passwordbuffer[len-1] == '\n'){
1074
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1075
len--;
1076
}
1077
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1078
915
if(not bret){
1079
916
perror("print_out_password");
1080
917
exitstatus = EXIT_FAILURE;
1087
924
perror("sigaction");
1088
925
exitstatus = EXIT_FAILURE;
1089
926
}
1090
927
1091
928
if(custom_argv != NULL){
1092
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1093
930
free(*arg);
1094
931
}
1095
932
free(custom_argv);
1096
933
}
934
free_plugin_list(plugin_list);
1097
935
1098
936
if(dir != NULL){
1099
937
closedir(dir);
1100
938
}
1101
939
1102
/* Kill the processes */
1103
for(plugin *p = plugin_list; p != NULL; p = p->next){
1104
if(p->pid != 0){
1105
close(p->fd);
1106
ret = kill(p->pid, SIGTERM);
1107
if(ret == -1 and errno != ESRCH){
1108
/* Set-uid proccesses might not get closed */
1109
perror("kill");
1110
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1111
948
}
949
free(process_list->buffer);
950
free(process_list);
1112
951
}
1113
952
1114
953
/* Wait for any remaining child processes to terminate */
1119
958
perror("wait");
1120
959
}
1121
960
1122
free_plugin_list();
1123
1124
free(plugindir);
1125
free(argfile);
1126
1127
961
return exitstatus;
1128
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0