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- Committer: Teddy Hogeborn
- Date: 2008-08-25 07:52:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825075235-gq338t4ywhqhire8
* mandos-clients.conf.xml (DESCRIPTION): Do not imply that this is the
only configuration file of
mandos(8).
(OPTIONS): Note that unknown options are ignored. When describing
"checker", be more specific about exit codes, and refer
to PATH. When describing "secret", refer to
mandos-keygen(8), and note the relationship with
"secfile". Added synopsis to "secfile", and note
relationship with "secret". Added synopsis and more text
to "host".
(EXAMPLE): Remove Radix-64 checksum from "secret" option value.
(SEE ALSO): New section, refer to mandos(8), mandos-keygen(8), and
mandos.conf(5).
only configuration file of
mandos(8).
(OPTIONS): Note that unknown options are ignored. When describing
"checker", be more specific about exit codes, and refer
to PATH. When describing "secret", refer to
mandos-keygen(8), and note the relationship with
"secfile". Added synopsis to "secfile", and note
relationship with "secret". Added synopsis and more text
to "host".
(EXAMPLE): Remove Radix-64 checksum from "secret" option value.
(SEE ALSO): New section, refer to mandos(8), mandos-keygen(8), and
mandos.conf(5).
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- 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,
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
66
72
67
#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;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
78
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
80
87
typedef struct plugin{
81
88
char *name; /* can be NULL or any plugin name */
82
89
char **argv;
84
91
char **environ;
85
92
int envc;
86
93
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
94
struct plugin *next;
98
95
} plugin;
99
96
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))){
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
109
101
return p;
110
102
}
111
103
}
112
104
/* Create a new plugin */
113
105
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
106
if (new_plugin == NULL){
115
107
return NULL;
116
108
}
117
109
char *copy_name = NULL;
118
110
if(name != NULL){
119
111
copy_name = strdup(name);
120
112
if(copy_name == NULL){
121
free(new_plugin);
122
113
return NULL;
123
114
}
124
115
}
125
116
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
130
122
131
123
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
124
if (new_plugin->argv == NULL){
133
125
free(copy_name);
134
126
free(new_plugin);
135
127
return NULL;
136
128
}
137
129
new_plugin->argv[0] = copy_name;
138
130
new_plugin->argv[1] = NULL;
139
131
140
132
new_plugin->environ = malloc(sizeof(char *));
141
133
if(new_plugin->environ == NULL){
142
134
free(copy_name);
145
137
return NULL;
146
138
}
147
139
new_plugin->environ[0] = NULL;
148
149
140
/* Append the new plugin to the list */
150
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
151
142
return new_plugin;
152
143
}
153
144
183
174
}
184
175
185
176
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
187
178
if(p == NULL){
188
179
return false;
189
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
208
182
}
209
183
184
210
185
/*
211
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
187
* Descriptor Flags".
213
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
214
189
*/
215
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
216
192
int ret = fcntl(fd, F_GETFD, 0);
217
193
/* If reading the flags failed, return error indication now. */
218
194
if(ret < 0){
222
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
223
199
}
224
200
201
process *process_list = NULL;
225
202
226
203
/* Mark processes as completed when they exit, and save their exit
227
204
status. */
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
230
206
while(true){
231
plugin *proc = plugin_list;
207
process *proc = process_list;
232
208
int status;
233
209
pid_t pid = waitpid(-1, &status, WNOHANG);
234
210
if(pid == 0){
236
212
break;
237
213
}
238
214
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
215
if (errno != ECHILD){
216
perror("waitpid");
242
217
}
243
perror("waitpid");
218
/* No child processes */
219
break;
244
220
}
245
221
246
222
/* A child exited, find it in process_list */
247
223
while(proc != NULL and proc->pid != pid){
248
224
proc = proc->next;
252
228
continue;
253
229
}
254
230
proc->status = status;
255
proc->completed = 1;
231
proc->completed = true;
256
232
}
257
errno = old_errno;
258
233
}
259
234
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
262
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
263
240
for(size_t written = 0; written < length; written += (size_t)ret){
264
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
242
length - written));
270
247
return true;
271
248
}
272
249
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
}
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
297
256
}
298
}
299
300
free(plugin_node);
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
301
270
}
302
271
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
306
284
}
307
285
}
308
286
309
287
int main(int argc, char *argv[]){
310
char *plugindir = NULL;
311
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
312
290
FILE *conffp;
313
291
size_t d_name_len;
314
292
DIR *dir = NULL;
316
294
struct stat st;
317
295
fd_set rfds_all;
318
296
int ret, maxfd = 0;
319
ssize_t sret;
320
intmax_t tmpmax;
321
297
uid_t uid = 65534;
322
298
gid_t gid = 65534;
323
299
bool debug = false;
348
324
{ .name = "global-options", .key = 'g',
349
325
.arg = "OPTION[,OPTION[,...]]",
350
326
.doc = "Options passed to all plugins" },
351
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
352
328
.arg = "VAR=value",
353
329
.doc = "Environment variable passed to all plugins" },
354
330
{ .name = "options-for", .key = 'o',
355
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
356
332
.doc = "Options passed only to specified plugin" },
357
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
358
334
.arg = "PLUGIN:ENV=value",
359
335
.doc = "Environment variable passed to specified plugin" },
360
336
{ .name = "disable", .key = 'd',
361
337
.arg = "PLUGIN",
362
338
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
366
339
{ .name = "plugin-dir", .key = 128,
367
340
.arg = "DIRECTORY",
368
341
.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 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
380
350
{ .name = NULL }
381
351
};
382
352
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'){
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
392
363
continue;
393
364
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
365
if(not add_argument(getplugin(NULL, plugins), p)){
395
366
perror("add_argument");
396
367
return ARGP_ERR_UNKNOWN;
397
368
}
398
369
}
399
370
}
400
371
break;
401
case 'G': /* --global-env */
372
case 'e':
402
373
if(arg == NULL){
403
374
break;
404
375
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
407
384
}
408
385
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;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
420
406
}
421
407
}
422
408
}
423
409
break;
424
case 'E': /* --env-for */
410
case 'f':
425
411
if(arg == NULL){
426
412
break;
427
413
}
430
416
if(envdef == NULL){
431
417
break;
432
418
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
425
perror("add_environment");
436
426
}
437
427
}
438
428
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
442
432
if(p == NULL){
443
433
return ARGP_ERR_UNKNOWN;
444
434
}
445
435
p->disabled = true;
446
436
}
447
437
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 */
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
490
448
debug = true;
491
449
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,
547
.args_doc = "",
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
465
.doc = "Mandos plugin runner -- Run plugins" };
549
466
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){
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
554
469
fprintf(stderr, "Unknown error while parsing arguments\n");
555
470
exitstatus = EXIT_FAILURE;
556
471
goto fallback;
557
472
}
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
}
473
474
conffp = fopen(argfile, "r");
568
475
if(conffp != NULL){
569
476
char *org_line = NULL;
570
477
char *p, *arg, *new_arg, *line;
571
478
size_t size = 0;
479
ssize_t sret;
572
480
const char whitespace_delims[] = " \r\t\f\v\n";
573
481
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 */
482
587
483
while(true){
588
484
sret = getline(&org_line, &size, conffp);
589
485
if(sret == -1){
590
486
break;
591
487
}
592
488
593
489
line = org_line;
594
490
arg = strsep(&line, comment_delim);
595
491
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
493
continue;
598
494
}
599
495
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;
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
618
502
}
619
503
}
620
504
free(org_line);
621
} else {
505
} else{
622
506
/* Check for harmful errors and go to fallback. Other errors might
623
507
not affect opening plugins */
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
509
perror("fopen");
626
510
exitstatus = EXIT_FAILURE;
627
511
goto fallback;
628
512
}
629
513
}
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
514
632
515
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){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
636
520
fprintf(stderr, "Unknown error while parsing arguments\n");
637
521
exitstatus = EXIT_FAILURE;
638
522
goto fallback;
639
523
}
640
524
}
641
525
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
}
650
651
526
if(debug){
652
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
653
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
655
530
for(char **a = p->argv; *a != NULL; a++){
656
531
fprintf(stderr, "\tArg: %s\n", *a);
657
532
}
658
fprintf(stderr, "...and %d environment variables\n", p->envc);
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
659
534
for(char **a = p->environ; *a != NULL; a++){
660
535
fprintf(stderr, "\t%s\n", *a);
661
536
}
662
537
}
663
538
}
664
539
665
/* Strip permissions down to nobody */
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
666
545
setgid(gid);
667
if(ret == -1){
546
if (ret == -1){
668
547
perror("setgid");
669
548
}
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
549
550
dir = opendir(plugindir);
681
551
if(dir == NULL){
682
552
perror("Could not open plugin dir");
683
553
exitstatus = EXIT_FAILURE;
699
569
700
570
FD_ZERO(&rfds_all);
701
571
702
/* Read and execute any executable in the plugin directory*/
703
572
while(true){
704
573
dirst = readdir(dir);
705
574
706
/* All directory entries have been processed */
575
// All directory entries have been processed
707
576
if(dirst == NULL){
708
if(errno == EBADF){
577
if (errno == EBADF){
709
578
perror("readdir");
710
579
exitstatus = EXIT_FAILURE;
711
580
goto fallback;
715
584
716
585
d_name_len = strlen(dirst->d_name);
717
586
718
/* Ignore dotfiles, backup files and other junk */
587
// Ignore dotfiles, backup files and other junk
719
588
{
720
589
bool bad_name = false;
721
590
723
592
724
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
725
594
".dpkg-old",
726
".dpkg-bak",
727
595
".dpkg-divert", NULL };
728
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
729
597
size_t pre_len = strlen(*pre);
737
605
break;
738
606
}
739
607
}
608
740
609
if(bad_name){
741
610
continue;
742
611
}
612
743
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
744
614
size_t suf_len = strlen(*suf);
745
615
if((d_name_len >= suf_len)
758
628
continue;
759
629
}
760
630
}
761
631
762
632
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
}
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
634
if(ret < 0){
769
635
perror("asprintf");
770
636
continue;
771
637
}
772
638
773
639
ret = stat(filename, &st);
774
if(ret == -1){
640
if (ret == -1){
775
641
perror("stat");
776
642
free(filename);
777
643
continue;
778
644
}
779
645
780
/* Ignore non-executable files */
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
782
647
if(debug){
783
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
784
649
" with bad type or mode\n", filename);
786
651
free(filename);
787
652
continue;
788
653
}
789
790
plugin *p = getplugin(dirst->d_name);
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
791
655
if(p == NULL){
792
656
perror("getplugin");
793
657
free(filename);
803
667
}
804
668
{
805
669
/* Add global arguments to argument list for this plugin */
806
plugin *g = getplugin(NULL);
670
plugin *g = getplugin(NULL, &plugin_list);
807
671
if(g != NULL){
808
672
for(char **a = g->argv + 1; *a != NULL; a++){
809
673
if(not add_argument(p, *a)){
812
676
}
813
677
/* Add global environment variables */
814
678
for(char **e = g->environ; *e != NULL; e++){
815
if(not add_environment(p, *e, false)){
679
if(not add_environment(p, *e)){
816
680
perror("add_environment");
817
681
}
818
682
}
823
687
process, too. */
824
688
if(p->environ[0] != NULL){
825
689
for(char **e = environ; *e != NULL; e++){
826
if(not add_environment(p, *e, false)){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
827
696
perror("add_environment");
828
697
}
829
698
}
831
700
832
701
int pipefd[2];
833
702
ret = pipe(pipefd);
834
if(ret == -1){
703
if (ret == -1){
835
704
perror("pipe");
836
705
exitstatus = EXIT_FAILURE;
837
706
goto fallback;
838
707
}
839
/* Ask OS to automatic close the pipe on exec */
840
708
ret = set_cloexec_flag(pipefd[0]);
841
709
if(ret < 0){
842
710
perror("set_cloexec_flag");
850
718
goto fallback;
851
719
}
852
720
/* Block SIGCHLD until process is safely in process list */
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
722
if(ret < 0){
855
723
perror("sigprocmask");
856
724
exitstatus = EXIT_FAILURE;
857
725
goto fallback;
858
726
}
859
/* Starting a new process to be watched */
727
// Starting a new process to be watched
860
728
pid_t pid = fork();
861
729
if(pid == -1){
862
730
perror("fork");
870
738
perror("sigaction");
871
739
_exit(EXIT_FAILURE);
872
740
}
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
742
if(ret < 0){
875
743
perror("sigprocmask");
876
744
_exit(EXIT_FAILURE);
877
745
}
878
746
879
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
748
if(ret == -1){
881
749
perror("dup2");
900
768
}
901
769
/* no return */
902
770
}
903
/* Parent process */
904
close(pipefd[1]); /* Close unused write end of pipe */
771
/* parent process */
905
772
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);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
778
if(ret < 0){
911
perror("sigprocmask");
779
perror("sigprocmask");
912
780
}
913
781
exitstatus = EXIT_FAILURE;
914
782
goto fallback;
915
783
}
916
784
917
new_plugin->pid = pid;
918
new_plugin->fd = pipefd[0];
919
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
920
790
/* Unblock SIGCHLD so signal handler can be run if this process
921
791
has already completed */
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
793
if(ret < 0){
924
794
perror("sigprocmask");
925
795
exitstatus = EXIT_FAILURE;
926
796
goto fallback;
927
797
}
928
798
929
FD_SET(new_plugin->fd, &rfds_all);
799
FD_SET(new_process->fd, &rfds_all);
930
800
931
if(maxfd < new_plugin->fd){
932
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
933
803
}
804
934
805
}
935
806
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
936
810
closedir(dir);
937
811
dir = NULL;
938
free_plugin(getplugin(NULL));
939
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
}
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
949
817
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
818
while(process_list){
953
819
fd_set rfds = rfds_all;
954
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
821
if (select_ret == -1){
956
822
perror("select");
957
823
exitstatus = EXIT_FAILURE;
958
824
goto fallback;
959
825
}
960
826
/* OK, now either a process completed, or something can be read
961
827
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
963
829
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
830
if(proc->eof and proc->completed){
965
831
/* Only accept the plugin output if it exited cleanly */
966
832
if(not WIFEXITED(proc->status)
967
833
or WEXITSTATUS(proc->status) != 0){
968
834
/* Bad exit by plugin */
969
970
835
if(debug){
971
836
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
975
839
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)));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
982
844
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
985
847
}
986
848
}
987
988
849
/* Remove the plugin */
989
850
FD_CLR(proc->fd, &rfds_all);
990
991
851
/* Block signal while modifying process_list */
992
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
853
if(ret < 0){
995
855
exitstatus = EXIT_FAILURE;
996
856
goto fallback;
997
857
}
998
999
plugin *next_plugin = proc->next;
1000
free_plugin(proc);
1001
proc = next_plugin;
1002
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1003
871
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1006
874
if(ret < 0){
1007
875
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1009
goto fallback;
1010
}
1011
1012
if(plugin_list == NULL){
1013
break;
1014
}
1015
1016
continue;
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1017
883
}
1018
1019
884
/* This process exited nicely, so print its buffer */
1020
885
1021
886
bool bret = print_out_password(proc->buffer,
1022
887
proc->buffer_length);
1023
888
if(not bret){
1026
891
}
1027
892
goto fallback;
1028
893
}
1029
1030
894
/* This process has not completed. Does it have any output? */
1031
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1032
896
/* This process had nothing to say at this time */
1033
proc = proc->next;
1034
897
continue;
1035
898
}
1036
899
/* Before reading, make the process' data buffer large enough */
1037
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1038
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
902
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
903
if (proc->buffer == NULL){
1041
904
perror("malloc");
1042
905
exitstatus = EXIT_FAILURE;
1043
906
goto fallback;
1045
908
proc->buffer_size += BUFFER_SIZE;
1046
909
}
1047
910
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1050
if(sret < 0){
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1051
914
/* Read error from this process; ignore the error */
1052
proc = proc->next;
1053
915
continue;
1054
916
}
1055
if(sret == 0){
917
if(ret == 0){
1056
918
/* got EOF */
1057
919
proc->eof = true;
1058
920
} else {
1059
proc->buffer_length += (size_t) sret;
921
proc->buffer_length += (size_t) ret;
1060
922
}
1061
923
}
1062
924
}
1063
1064
925
926
1065
927
fallback:
1066
928
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1068
930
/* Fallback if all plugins failed, none are found or an error
1069
931
occured */
1070
932
bool bret;
1071
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1072
934
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);
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1080
936
if(not bret){
1081
937
perror("print_out_password");
1082
938
exitstatus = EXIT_FAILURE;
1089
945
perror("sigaction");
1090
946
exitstatus = EXIT_FAILURE;
1091
947
}
1092
948
1093
949
if(custom_argv != NULL){
1094
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1095
951
free(*arg);
1096
952
}
1097
953
free(custom_argv);
1098
954
}
955
free_plugin_list(plugin_list);
1099
956
1100
957
if(dir != NULL){
1101
958
closedir(dir);
1102
959
}
1103
960
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
}
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1113
969
}
970
free(process_list->buffer);
971
free(process_list);
1114
972
}
1115
973
1116
974
/* Wait for any remaining child processes to terminate */
1121
979
perror("wait");
1122
980
}
1123
981
1124
free_plugin_list();
1125
1126
free(plugindir);
1127
free(argfile);
1128
1129
982
return exitstatus;
1130
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0