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- Committer: Teddy Hogeborn
- Date: 2008-08-16 16:58:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816165831-cx018vo5i9oqmgo0
* plugins.d/password-request.c (main): Include environment variables
"cryptsource" and "crypttarget"
in password prompt.
"cryptsource" and "crypttarget"
in password prompt.
- 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
}
121
}
122
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
108
*new_plugin = (plugin) { .name = name,
109
.argc = 1,
110
.envc = 0,
111
.disabled = false,
112
.next = *plugin_list };
127
113
128
114
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
115
if (new_plugin->argv == NULL){
131
116
free(new_plugin);
132
117
return NULL;
133
118
}
134
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
135
120
new_plugin->argv[1] = NULL;
136
121
137
122
new_plugin->environ = malloc(sizeof(char *));
138
123
if(new_plugin->environ == NULL){
139
free(copy_name);
140
124
free(new_plugin->argv);
141
125
free(new_plugin);
142
126
return NULL;
143
127
}
144
128
new_plugin->environ[0] = NULL;
145
146
129
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
148
131
return new_plugin;
149
132
}
150
133
180
163
}
181
164
182
165
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
184
167
if(p == NULL){
185
168
return false;
186
169
}
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
170
return add_to_char_array(def, &(p->environ), &(p->envc));
205
171
}
206
172
173
207
174
/*
208
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
176
* Descriptor Flags".
210
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
178
*/
212
static int set_cloexec_flag(int fd){
179
static int set_cloexec_flag(int fd)
180
{
213
181
int ret = fcntl(fd, F_GETFD, 0);
214
182
/* If reading the flags failed, return error indication now. */
215
183
if(ret < 0){
219
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
188
}
221
189
190
process *process_list = NULL;
222
191
223
/* Mark processes as completed when they exit, and save their exit
192
/* Mark a process as completed when it exits, and save its exit
224
193
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;
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
255
211
}
256
212
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
213
bool print_out_password(const char *buffer, size_t length){
259
214
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
260
218
for(size_t written = 0; written < length; written += (size_t)ret){
261
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
220
length - written));
267
225
return true;
268
226
}
269
227
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
}
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
294
234
}
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
303
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
304
247
}
305
248
306
249
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
309
252
FILE *conffp;
310
253
size_t d_name_len;
311
254
DIR *dir = NULL;
312
255
struct dirent *dirst;
313
256
struct stat st;
314
257
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
258
int ret, maxfd = 0;
318
259
uid_t uid = 65534;
319
260
gid_t gid = 65534;
320
261
bool debug = false;
328
269
/* Establish a signal handler */
329
270
sigemptyset(&sigchld_action.sa_mask);
330
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
if(ret == -1){
272
if(ret < 0){
332
273
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
334
goto fallback;
274
exit(EXIT_FAILURE);
335
275
}
336
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
if(ret == -1){
277
if(ret < 0){
338
278
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
340
goto fallback;
279
exit(EXIT_FAILURE);
341
280
}
342
281
343
282
/* The options we understand. */
345
284
{ .name = "global-options", .key = 'g',
346
285
.arg = "OPTION[,OPTION[,...]]",
347
286
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
349
288
.arg = "VAR=value",
350
289
.doc = "Environment variable passed to all plugins" },
351
290
{ .name = "options-for", .key = 'o',
352
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
292
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
355
294
.arg = "PLUGIN:ENV=value",
356
295
.doc = "Environment variable passed to specified plugin" },
357
296
{ .name = "disable", .key = 'd',
358
297
.arg = "PLUGIN",
359
298
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
299
{ .name = "plugin-dir", .key = 128,
364
300
.arg = "DIRECTORY",
365
301
.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 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
377
310
{ .name = NULL }
378
311
};
379
312
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){
385
char *plugin_option;
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
if (arg != NULL){
320
char *p;
321
while((p = strsep(&arg, ",")) != NULL){
322
if(p[0] == '\0'){
388
323
continue;
389
324
}
390
if(not add_argument(getplugin(NULL), plugin_option)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
391
326
perror("add_argument");
392
327
return ARGP_ERR_UNKNOWN;
393
328
}
394
329
}
395
330
}
396
331
break;
397
case 'G': /* --global-env */
332
case 'e':
398
333
if(arg == NULL){
399
334
break;
400
335
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
403
344
}
404
345
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
346
case 'o':
347
if (arg != NULL){
348
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
350
break;
351
}
352
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
354
break;
355
}
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
416
366
}
417
367
}
418
368
}
419
369
break;
420
case 'E': /* --env-for */
370
case 'f':
421
371
if(arg == NULL){
422
372
break;
423
373
}
426
376
if(envdef == NULL){
427
377
break;
428
378
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
385
perror("add_environment");
432
386
}
433
387
}
434
388
break;
435
case 'd': /* --disable */
436
if(arg != NULL){
437
plugin *p = getplugin(arg);
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
438
392
if(p == NULL){
439
393
return ARGP_ERR_UNKNOWN;
440
394
}
441
395
p->disabled = true;
442
396
}
443
397
break;
444
case 'e': /* --enable */
445
if(arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
471
}
472
break;
473
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
481
}
482
break;
483
case 132: /* --debug */
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
case 131:
484
408
debug = true;
485
409
break;
486
/*
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
489
*/
490
case ARGP_KEY_ARG:
491
/* Cryptsetup always passes an argument, which is an empty
492
string if "none" was specified in /etc/crypttab. So if
493
argument was empty, we ignore it silently. */
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
496
}
497
break;
498
case ARGP_KEY_END:
499
break;
500
default:
501
return ARGP_ERR_UNKNOWN;
502
}
503
return 0;
504
}
505
506
/* This option parser is the same as parse_opt() above, except it
507
ignores everything but the --config-file option. */
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
511
switch(key){
512
case 'g': /* --global-options */
513
case 'G': /* --global-env */
514
case 'o': /* --options-for */
515
case 'E': /* --env-for */
516
case 'd': /* --disable */
517
case 'e': /* --enable */
518
case 128: /* --plugin-dir */
519
break;
520
case 129: /* --config-file */
521
free(argfile);
522
argfile = strdup(arg);
523
if(argfile == NULL){
524
perror("strdup");
525
}
526
break;
527
case 130: /* --userid */
528
case 131: /* --groupid */
529
case 132: /* --debug */
530
case ARGP_KEY_ARG:
531
case ARGP_KEY_END:
532
break;
533
default:
534
return ARGP_ERR_UNKNOWN;
535
}
536
return 0;
537
}
538
539
struct argp argp = { .options = options,
540
.parser = parse_opt_config_file,
541
.args_doc = "",
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
542
425
.doc = "Mandos plugin runner -- Run plugins" };
543
426
544
/* Parse using parse_opt_config_file() in order to get the custom
545
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
548
429
fprintf(stderr, "Unknown error while parsing arguments\n");
549
430
exitstatus = EXIT_FAILURE;
550
goto fallback;
431
goto end;
551
432
}
552
553
/* Reset to the normal argument parser */
554
argp.parser = parse_opt;
555
556
/* Open the configfile if available */
557
if(argfile == NULL){
558
conffp = fopen(AFILE, "r");
559
} else {
560
conffp = fopen(argfile, "r");
561
}
433
434
conffp = fopen(argfile, "r");
562
435
if(conffp != NULL){
563
436
char *org_line = NULL;
437
size_t size = 0;
438
ssize_t sret;
564
439
char *p, *arg, *new_arg, *line;
565
size_t size = 0;
566
440
const char whitespace_delims[] = " \r\t\f\v\n";
567
441
const char comment_delim[] = "#";
568
442
569
custom_argc = 1;
570
custom_argv = malloc(sizeof(char*) * 2);
571
if(custom_argv == NULL){
572
perror("malloc");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
custom_argv[0] = argv[0];
577
custom_argv[1] = NULL;
578
579
/* for each line in the config file, strip whitespace and ignore
580
commented text */
581
443
while(true){
582
444
sret = getline(&org_line, &size, conffp);
583
445
if(sret == -1){
591
453
continue;
592
454
}
593
455
new_arg = strdup(p);
594
if(new_arg == NULL){
595
perror("strdup");
596
exitstatus = EXIT_FAILURE;
597
free(org_line);
598
goto fallback;
599
}
600
601
custom_argc += 1;
602
custom_argv = realloc(custom_argv, sizeof(char *)
603
* ((unsigned int) custom_argc + 1));
604
if(custom_argv == NULL){
605
perror("realloc");
606
exitstatus = EXIT_FAILURE;
607
free(org_line);
608
goto fallback;
609
}
610
custom_argv[custom_argc-1] = new_arg;
611
custom_argv[custom_argc] = NULL;
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
612
462
}
613
463
}
614
464
free(org_line);
615
} else {
465
} else{
616
466
/* Check for harmful errors and go to fallback. Other errors might
617
467
not affect opening plugins */
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
619
469
perror("fopen");
620
470
exitstatus = EXIT_FAILURE;
621
goto fallback;
471
goto end;
622
472
}
623
473
}
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
474
626
475
if(custom_argv != NULL){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
630
479
fprintf(stderr, "Unknown error while parsing arguments\n");
631
480
exitstatus = EXIT_FAILURE;
632
goto fallback;
481
goto end;
633
482
}
634
483
}
635
484
636
/* Parse actual command line arguments, to let them override the
637
config file */
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
642
goto fallback;
643
}
644
645
485
if(debug){
646
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
647
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
649
489
for(char **a = p->argv; *a != NULL; a++){
650
490
fprintf(stderr, "\tArg: %s\n", *a);
651
491
}
652
fprintf(stderr, "...and %d environment variables\n", p->envc);
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
653
493
for(char **a = p->environ; *a != NULL; a++){
654
494
fprintf(stderr, "\t%s\n", *a);
655
495
}
656
496
}
657
497
}
658
498
659
/* Strip permissions down to nobody */
499
ret = setuid(uid);
500
if (ret == -1){
501
perror("setuid");
502
}
503
660
504
setgid(gid);
661
if(ret == -1){
505
if (ret == -1){
662
506
perror("setgid");
663
507
}
664
ret = setuid(uid);
665
if(ret == -1){
666
perror("setuid");
667
}
668
669
if(plugindir == NULL){
670
dir = opendir(PDIR);
671
} else {
672
dir = opendir(plugindir);
673
}
674
508
509
dir = opendir(plugindir);
675
510
if(dir == NULL){
676
511
perror("Could not open plugin dir");
677
512
exitstatus = EXIT_FAILURE;
678
goto fallback;
513
goto end;
679
514
}
680
515
681
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
686
521
if(ret < 0){
687
522
perror("set_cloexec_flag");
688
523
exitstatus = EXIT_FAILURE;
689
goto fallback;
524
goto end;
690
525
}
691
526
}
692
527
}
693
528
694
529
FD_ZERO(&rfds_all);
695
530
696
/* Read and execute any executable in the plugin directory*/
697
531
while(true){
698
532
dirst = readdir(dir);
699
533
700
/* All directory entries have been processed */
534
// All directory entries have been processed
701
535
if(dirst == NULL){
702
if(errno == EBADF){
536
if (errno == EBADF){
703
537
perror("readdir");
704
538
exitstatus = EXIT_FAILURE;
705
goto fallback;
539
goto end;
706
540
}
707
541
break;
708
542
}
709
543
710
544
d_name_len = strlen(dirst->d_name);
711
545
712
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
713
547
{
714
548
bool bad_name = false;
715
549
717
551
718
552
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
719
553
".dpkg-old",
720
".dpkg-bak",
721
554
".dpkg-divert", NULL };
722
555
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
723
556
size_t pre_len = strlen(*pre);
731
564
break;
732
565
}
733
566
}
567
734
568
if(bad_name){
735
569
continue;
736
570
}
571
737
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
738
573
size_t suf_len = strlen(*suf);
739
574
if((d_name_len >= suf_len)
754
589
}
755
590
756
591
char *filename;
757
if(plugindir == NULL){
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
759
} else {
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
}
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
593
if(ret < 0){
763
594
perror("asprintf");
764
595
continue;
765
596
}
766
597
767
598
ret = stat(filename, &st);
768
if(ret == -1){
599
if (ret == -1){
769
600
perror("stat");
770
601
free(filename);
771
602
continue;
772
603
}
773
774
/* Ignore non-executable files */
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
604
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
776
606
if(debug){
777
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
778
608
" with bad type or mode\n", filename);
780
610
free(filename);
781
611
continue;
782
612
}
783
784
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
785
614
if(p == NULL){
786
615
perror("getplugin");
787
616
free(filename);
797
626
}
798
627
{
799
628
/* Add global arguments to argument list for this plugin */
800
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
801
630
if(g != NULL){
802
631
for(char **a = g->argv + 1; *a != NULL; a++){
803
632
if(not add_argument(p, *a)){
806
635
}
807
636
/* Add global environment variables */
808
637
for(char **e = g->environ; *e != NULL; e++){
809
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
810
639
perror("add_environment");
811
640
}
812
641
}
817
646
process, too. */
818
647
if(p->environ[0] != NULL){
819
648
for(char **e = environ; *e != NULL; e++){
820
if(not add_environment(p, *e, false)){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
821
655
perror("add_environment");
822
656
}
823
657
}
824
658
}
825
659
826
int pipefd[2];
660
int pipefd[2];
827
661
ret = pipe(pipefd);
828
if(ret == -1){
662
if (ret == -1){
829
663
perror("pipe");
830
664
exitstatus = EXIT_FAILURE;
831
goto fallback;
665
goto end;
832
666
}
833
/* Ask OS to automatic close the pipe on exec */
834
667
ret = set_cloexec_flag(pipefd[0]);
835
668
if(ret < 0){
836
669
perror("set_cloexec_flag");
837
670
exitstatus = EXIT_FAILURE;
838
goto fallback;
671
goto end;
839
672
}
840
673
ret = set_cloexec_flag(pipefd[1]);
841
674
if(ret < 0){
842
675
perror("set_cloexec_flag");
843
676
exitstatus = EXIT_FAILURE;
844
goto fallback;
677
goto end;
845
678
}
846
679
/* Block SIGCHLD until process is safely in process list */
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
848
681
if(ret < 0){
849
682
perror("sigprocmask");
850
683
exitstatus = EXIT_FAILURE;
851
goto fallback;
684
goto end;
852
685
}
853
/* Starting a new process to be watched */
686
// Starting a new process to be watched
854
687
pid_t pid = fork();
855
688
if(pid == -1){
856
689
perror("fork");
857
690
exitstatus = EXIT_FAILURE;
858
goto fallback;
691
goto end;
859
692
}
860
693
if(pid == 0){
861
694
/* this is the child process */
864
697
perror("sigaction");
865
698
_exit(EXIT_FAILURE);
866
699
}
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
868
701
if(ret < 0){
869
702
perror("sigprocmask");
870
703
_exit(EXIT_FAILURE);
871
704
}
872
705
873
706
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
874
707
if(ret == -1){
875
708
perror("dup2");
894
727
}
895
728
/* no return */
896
729
}
897
/* Parent process */
898
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
899
731
free(filename);
900
plugin *new_plugin = getplugin(dirst->d_name);
901
if(new_plugin == NULL){
902
perror("getplugin");
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
737
if(ret < 0){
905
perror("sigprocmask");
738
perror("sigprocmask");
906
739
}
907
740
exitstatus = EXIT_FAILURE;
908
goto fallback;
741
goto end;
909
742
}
910
743
911
new_plugin->pid = pid;
912
new_plugin->fd = pipefd[0];
913
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
914
749
/* Unblock SIGCHLD so signal handler can be run if this process
915
750
has already completed */
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
917
752
if(ret < 0){
918
753
perror("sigprocmask");
919
754
exitstatus = EXIT_FAILURE;
920
goto fallback;
921
}
922
923
FD_SET(new_plugin->fd, &rfds_all);
924
925
if(maxfd < new_plugin->fd){
926
maxfd = new_plugin->fd;
927
}
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
928
776
}
929
777
930
778
closedir(dir);
931
779
dir = NULL;
932
free_plugin(getplugin(NULL));
933
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
935
if(p->pid != 0){
936
break;
937
}
938
if(p->next == NULL){
939
fprintf(stderr, "No plugin processes started. Incorrect plugin"
940
" directory?\n");
941
free_plugin_list();
942
}
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
943
785
}
944
945
/* Main loop while running plugins exist */
946
while(plugin_list){
786
while(process_list){
947
787
fd_set rfds = rfds_all;
948
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
949
if(select_ret == -1){
789
if (select_ret == -1){
950
790
perror("select");
951
791
exitstatus = EXIT_FAILURE;
952
goto fallback;
792
goto end;
953
793
}
954
794
/* OK, now either a process completed, or something can be read
955
795
from one of them */
956
for(plugin *proc = plugin_list; proc != NULL;){
796
for(process *proc = process_list; proc ; proc = proc->next){
957
797
/* Is this process completely done? */
958
if(proc->completed and proc->eof){
798
if(proc->eof and proc->completed){
959
799
/* Only accept the plugin output if it exited cleanly */
960
800
if(not WIFEXITED(proc->status)
961
801
or WEXITSTATUS(proc->status) != 0){
962
802
/* Bad exit by plugin */
963
964
803
if(debug){
965
804
if(WIFEXITED(proc->status)){
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
969
807
WEXITSTATUS(proc->status));
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
974
811
WTERMSIG(proc->status));
975
812
} else if(WCOREDUMP(proc->status)){
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
978
815
}
979
816
}
980
981
817
/* Remove the plugin */
982
818
FD_CLR(proc->fd, &rfds_all);
983
984
819
/* Block signal while modifying process_list */
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
986
821
if(ret < 0){
987
822
perror("sigprocmask");
988
823
exitstatus = EXIT_FAILURE;
989
goto fallback;
990
}
991
992
plugin *next_plugin = proc->next;
993
free_plugin(proc);
994
proc = next_plugin;
995
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
996
839
/* We are done modifying process list, so unblock signal */
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
999
842
if(ret < 0){
1000
843
perror("sigprocmask");
1001
exitstatus = EXIT_FAILURE;
1002
goto fallback;
1003
}
1004
1005
if(plugin_list == NULL){
1006
break;
1007
}
1008
1009
continue;
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
1010
851
}
1011
1012
852
/* This process exited nicely, so print its buffer */
1013
1014
bool bret = print_out_password(proc->buffer,
1015
proc->buffer_length);
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1016
855
if(not bret){
1017
856
perror("print_out_password");
1018
857
exitstatus = EXIT_FAILURE;
1019
858
}
1020
goto fallback;
859
goto end;
1021
860
}
1022
1023
861
/* This process has not completed. Does it have any output? */
1024
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1025
863
/* This process had nothing to say at this time */
1026
proc = proc->next;
1027
864
continue;
1028
865
}
1029
866
/* Before reading, make the process' data buffer large enough */
1030
867
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1031
868
proc->buffer = realloc(proc->buffer, proc->buffer_size
1032
869
+ (size_t) BUFFER_SIZE);
1033
if(proc->buffer == NULL){
870
if (proc->buffer == NULL){
1034
871
perror("malloc");
1035
872
exitstatus = EXIT_FAILURE;
1036
goto fallback;
873
goto end;
1037
874
}
1038
875
proc->buffer_size += BUFFER_SIZE;
1039
876
}
1040
877
/* Read from the process */
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1043
if(sret < 0){
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1044
881
/* Read error from this process; ignore the error */
1045
proc = proc->next;
1046
882
continue;
1047
883
}
1048
if(sret == 0){
884
if(ret == 0){
1049
885
/* got EOF */
1050
886
proc->eof = true;
1051
887
} else {
1052
proc->buffer_length += (size_t) sret;
888
proc->buffer_length += (size_t) ret;
1053
889
}
1054
890
}
1055
891
}
1056
892
1057
893
1058
fallback:
894
end:
1059
895
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1061
/* Fallback if all plugins failed, none are found or an error
1062
occured */
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1063
898
bool bret;
1064
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1065
900
char *passwordbuffer = getpass("Password: ");
1066
size_t len = strlen(passwordbuffer);
1067
/* Strip trailing newline */
1068
if(len > 0 and passwordbuffer[len-1] == '\n'){
1069
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1070
len--;
1071
}
1072
bret = print_out_password(passwordbuffer, len);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1073
902
if(not bret){
1074
903
perror("print_out_password");
1075
904
exitstatus = EXIT_FAILURE;
905
goto end;
1076
906
}
1077
907
}
1078
908
1079
909
/* Restore old signal handler */
1080
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1081
if(ret == -1){
1082
perror("sigaction");
1083
exitstatus = EXIT_FAILURE;
1084
}
1085
1086
if(custom_argv != NULL){
1087
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1088
free(*arg);
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1089
922
}
1090
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1091
925
}
1092
926
1093
927
if(dir != NULL){
1094
928
closedir(dir);
1095
929
}
1096
930
1097
/* Kill the processes */
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1099
if(p->pid != 0){
1100
close(p->fd);
1101
ret = kill(p->pid, SIGTERM);
1102
if(ret == -1 and errno != ESRCH){
1103
/* Set-uid proccesses might not get closed */
1104
perror("kill");
1105
}
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1106
939
}
940
free(process_list->buffer);
941
free(process_list);
1107
942
}
1108
943
1109
944
/* Wait for any remaining child processes to terminate */
1114
949
perror("wait");
1115
950
}
1116
951
1117
free_plugin_list();
1118
1119
free(plugindir);
1120
free(argfile);
1121
1122
952
return exitstatus;
1123
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0