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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,
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,
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#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;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
75
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
72
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
73
struct process;
84
74
85
/* Variables used for running processes*/
75
typedef struct process{
86
76
pid_t pid;
87
77
int fd;
88
78
char *buffer;
91
81
bool eof;
92
82
volatile bool completed;
93
83
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
94
94
struct plugin *next;
95
95
} plugin;
96
96
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))){
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))){
106
101
return p;
107
102
}
108
103
}
109
104
/* Create a new plugin */
110
105
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
106
if (new_plugin == NULL){
112
107
return NULL;
113
108
}
114
109
char *copy_name = NULL;
115
110
if(name != NULL){
116
111
copy_name = strdup(name);
117
112
if(copy_name == NULL){
118
free(new_plugin);
119
113
return NULL;
120
114
}
121
115
}
122
116
123
117
*new_plugin = (plugin) { .name = copy_name,
124
118
.argc = 1,
119
.envc = 0,
125
120
.disabled = false,
126
.next = plugin_list };
121
.next = *plugin_list };
127
122
128
123
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
124
if (new_plugin->argv == NULL){
130
125
free(copy_name);
131
126
free(new_plugin);
132
127
return NULL;
133
128
}
134
129
new_plugin->argv[0] = copy_name;
135
130
new_plugin->argv[1] = NULL;
136
131
137
132
new_plugin->environ = malloc(sizeof(char *));
138
133
if(new_plugin->environ == NULL){
139
134
free(copy_name);
142
137
return NULL;
143
138
}
144
139
new_plugin->environ[0] = NULL;
145
146
140
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
148
142
return new_plugin;
149
143
}
150
144
180
174
}
181
175
182
176
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
184
178
if(p == NULL){
185
179
return false;
186
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
205
182
}
206
183
184
207
185
/*
208
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
187
* Descriptor Flags".
210
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
189
*/
212
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
213
192
int ret = fcntl(fd, F_GETFD, 0);
214
193
/* If reading the flags failed, return error indication now. */
215
194
if(ret < 0){
219
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
199
}
221
200
201
process *process_list = NULL;
222
202
223
203
/* Mark processes as completed when they exit, and save their exit
224
204
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
205
void handle_sigchld(__attribute__((unused)) int sig){
226
206
while(true){
227
plugin *proc = plugin_list;
207
process *proc = process_list;
228
208
int status;
229
209
pid_t pid = waitpid(-1, &status, WNOHANG);
230
210
if(pid == 0){
232
212
break;
233
213
}
234
214
if(pid == -1){
235
if(errno != ECHILD){
215
if (errno != ECHILD){
236
216
perror("waitpid");
237
217
}
238
218
/* No child processes */
239
219
break;
240
220
}
241
221
242
222
/* A child exited, find it in process_list */
243
223
while(proc != NULL and proc->pid != pid){
244
224
proc = proc->next;
252
232
}
253
233
}
254
234
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
257
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
258
240
for(size_t written = 0; written < length; written += (size_t)ret){
259
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
242
length - written));
265
247
return true;
266
248
}
267
249
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
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;
292
256
}
293
}
294
295
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;
296
270
}
297
271
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
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);
301
284
}
302
285
}
303
286
304
287
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
307
290
FILE *conffp;
308
291
size_t d_name_len;
309
292
DIR *dir = NULL;
310
293
struct dirent *dirst;
311
294
struct stat st;
312
295
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
296
int ret, maxfd = 0;
316
297
uid_t uid = 65534;
317
298
gid_t gid = 65534;
318
299
bool debug = false;
343
324
{ .name = "global-options", .key = 'g',
344
325
.arg = "OPTION[,OPTION[,...]]",
345
326
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
347
328
.arg = "VAR=value",
348
329
.doc = "Environment variable passed to all plugins" },
349
330
{ .name = "options-for", .key = 'o',
350
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
332
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
353
334
.arg = "PLUGIN:ENV=value",
354
335
.doc = "Environment variable passed to specified plugin" },
355
336
{ .name = "disable", .key = 'd',
356
337
.arg = "PLUGIN",
357
338
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
339
{ .name = "plugin-dir", .key = 128,
362
340
.arg = "DIRECTORY",
363
341
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.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 },
375
350
{ .name = NULL }
376
351
};
377
352
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
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){
383
360
char *p;
384
361
while((p = strsep(&arg, ",")) != NULL){
385
362
if(p[0] == '\0'){
386
363
continue;
387
364
}
388
if(not add_argument(getplugin(NULL), p)){
365
if(not add_argument(getplugin(NULL, plugins), p)){
389
366
perror("add_argument");
390
367
return ARGP_ERR_UNKNOWN;
391
368
}
392
369
}
393
370
}
394
371
break;
395
case 'G': /* --global-env */
372
case 'e':
396
373
if(arg == NULL){
397
374
break;
398
375
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
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
}
401
384
}
402
385
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
386
case 'o':
387
if (arg != NULL){
405
388
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
389
if(p_name[0] == '\0'){
407
390
break;
408
391
}
409
392
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
393
if(opt[0] == '\0'){
411
394
break;
412
395
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
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
}
421
406
}
422
407
}
423
408
}
424
409
break;
425
case 'E': /* --env-for */
410
case 'f':
426
411
if(arg == NULL){
427
412
break;
428
413
}
431
416
if(envdef == NULL){
432
417
break;
433
418
}
434
*envdef = '\0';
435
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)){
436
425
perror("add_environment");
437
426
}
438
427
}
439
428
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
443
432
if(p == NULL){
444
433
return ARGP_ERR_UNKNOWN;
445
434
}
446
435
p->disabled = true;
447
436
}
448
437
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
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:
489
448
debug = true;
490
449
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.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]",
547
465
.doc = "Mandos plugin runner -- Run plugins" };
548
466
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
553
469
fprintf(stderr, "Unknown error while parsing arguments\n");
554
470
exitstatus = EXIT_FAILURE;
555
471
goto fallback;
556
472
}
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
473
474
conffp = fopen(argfile, "r");
567
475
if(conffp != NULL){
568
476
char *org_line = NULL;
569
477
char *p, *arg, *new_arg, *line;
570
478
size_t size = 0;
479
ssize_t sret;
571
480
const char whitespace_delims[] = " \r\t\f\v\n";
572
481
const char comment_delim[] = "#";
573
482
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
586
483
while(true){
587
484
sret = getline(&org_line, &size, conffp);
588
485
if(sret == -1){
596
493
continue;
597
494
}
598
495
new_arg = strdup(p);
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
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
}
617
502
}
618
503
}
619
504
free(org_line);
620
} else {
505
} else{
621
506
/* Check for harmful errors and go to fallback. Other errors might
622
507
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
509
perror("fopen");
625
510
exitstatus = EXIT_FAILURE;
626
511
goto fallback;
627
512
}
628
513
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
514
631
515
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
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){
635
520
fprintf(stderr, "Unknown error while parsing arguments\n");
636
521
exitstatus = EXIT_FAILURE;
637
522
goto fallback;
638
523
}
639
524
}
640
525
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
526
if(debug){
651
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
530
for(char **a = p->argv; *a != NULL; a++){
655
531
fprintf(stderr, "\tArg: %s\n", *a);
656
532
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
534
for(char **a = p->environ; *a != NULL; a++){
659
535
fprintf(stderr, "\t%s\n", *a);
660
536
}
661
537
}
662
538
}
663
539
664
/* Strip permissions down to nobody */
665
540
ret = setuid(uid);
666
if(ret == -1){
541
if (ret == -1){
667
542
perror("setuid");
668
}
543
}
544
669
545
setgid(gid);
670
if(ret == -1){
546
if (ret == -1){
671
547
perror("setgid");
672
548
}
673
549
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
550
dir = opendir(plugindir);
680
551
if(dir == NULL){
681
552
perror("Could not open plugin dir");
682
553
exitstatus = EXIT_FAILURE;
698
569
699
570
FD_ZERO(&rfds_all);
700
571
701
/* Read and execute any executable in the plugin directory*/
702
572
while(true){
703
573
dirst = readdir(dir);
704
574
705
/* All directory entries have been processed */
575
// All directory entries have been processed
706
576
if(dirst == NULL){
707
if(errno == EBADF){
577
if (errno == EBADF){
708
578
perror("readdir");
709
579
exitstatus = EXIT_FAILURE;
710
580
goto fallback;
714
584
715
585
d_name_len = strlen(dirst->d_name);
716
586
717
/* Ignore dotfiles, backup files and other junk */
587
// Ignore dotfiles, backup files and other junk
718
588
{
719
589
bool bad_name = false;
720
590
722
592
723
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
594
".dpkg-old",
725
".dpkg-bak",
726
595
".dpkg-divert", NULL };
727
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
597
size_t pre_len = strlen(*pre);
736
605
break;
737
606
}
738
607
}
608
739
609
if(bad_name){
740
610
continue;
741
611
}
612
742
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
614
size_t suf_len = strlen(*suf);
744
615
if((d_name_len >= suf_len)
759
630
}
760
631
761
632
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
634
if(ret < 0){
768
635
perror("asprintf");
769
636
continue;
770
637
}
771
638
772
639
ret = stat(filename, &st);
773
if(ret == -1){
640
if (ret == -1){
774
641
perror("stat");
775
642
free(filename);
776
643
continue;
777
644
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
647
if(debug){
782
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
649
" with bad type or mode\n", filename);
785
651
free(filename);
786
652
continue;
787
653
}
788
789
plugin *p = getplugin(dirst->d_name);
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
655
if(p == NULL){
791
656
perror("getplugin");
792
657
free(filename);
802
667
}
803
668
{
804
669
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
670
plugin *g = getplugin(NULL, &plugin_list);
806
671
if(g != NULL){
807
672
for(char **a = g->argv + 1; *a != NULL; a++){
808
673
if(not add_argument(p, *a)){
811
676
}
812
677
/* Add global environment variables */
813
678
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
679
if(not add_environment(p, *e)){
815
680
perror("add_environment");
816
681
}
817
682
}
822
687
process, too. */
823
688
if(p->environ[0] != NULL){
824
689
for(char **e = environ; *e != NULL; e++){
825
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)){
826
696
perror("add_environment");
827
697
}
828
698
}
830
700
831
701
int pipefd[2];
832
702
ret = pipe(pipefd);
833
if(ret == -1){
703
if (ret == -1){
834
704
perror("pipe");
835
705
exitstatus = EXIT_FAILURE;
836
706
goto fallback;
837
707
}
838
/* Ask OS to automatic close the pipe on exec */
839
708
ret = set_cloexec_flag(pipefd[0]);
840
709
if(ret < 0){
841
710
perror("set_cloexec_flag");
849
718
goto fallback;
850
719
}
851
720
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
722
if(ret < 0){
854
723
perror("sigprocmask");
855
724
exitstatus = EXIT_FAILURE;
856
725
goto fallback;
857
726
}
858
/* Starting a new process to be watched */
727
// Starting a new process to be watched
859
728
pid_t pid = fork();
860
729
if(pid == -1){
861
730
perror("fork");
869
738
perror("sigaction");
870
739
_exit(EXIT_FAILURE);
871
740
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
742
if(ret < 0){
874
743
perror("sigprocmask");
875
744
_exit(EXIT_FAILURE);
876
745
}
877
746
878
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
748
if(ret == -1){
880
749
perror("dup2");
899
768
}
900
769
/* no return */
901
770
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
771
/* parent process */
904
772
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
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);
909
778
if(ret < 0){
910
perror("sigprocmask");
779
perror("sigprocmask");
911
780
}
912
781
exitstatus = EXIT_FAILURE;
913
782
goto fallback;
914
783
}
915
784
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
919
790
/* Unblock SIGCHLD so signal handler can be run if this process
920
791
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
793
if(ret < 0){
923
794
perror("sigprocmask");
924
795
exitstatus = EXIT_FAILURE;
925
796
goto fallback;
926
797
}
927
798
928
FD_SET(new_plugin->fd, &rfds_all);
799
FD_SET(new_process->fd, &rfds_all);
929
800
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
932
803
}
804
933
805
}
934
806
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
935
810
closedir(dir);
936
811
dir = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
947
817
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
818
while(process_list){
951
819
fd_set rfds = rfds_all;
952
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
821
if (select_ret == -1){
954
822
perror("select");
955
823
exitstatus = EXIT_FAILURE;
956
824
goto fallback;
957
825
}
958
826
/* OK, now either a process completed, or something can be read
959
827
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
961
829
/* Is this process completely done? */
962
830
if(proc->eof and proc->completed){
963
831
/* Only accept the plugin output if it exited cleanly */
964
832
if(not WIFEXITED(proc->status)
965
833
or WEXITSTATUS(proc->status) != 0){
966
834
/* Bad exit by plugin */
967
968
835
if(debug){
969
836
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
972
839
WEXITSTATUS(proc->status));
973
840
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
976
843
WTERMSIG(proc->status));
977
844
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
980
847
}
981
848
}
982
983
849
/* Remove the plugin */
984
850
FD_CLR(proc->fd, &rfds_all);
985
986
851
/* Block signal while modifying process_list */
987
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
853
if(ret < 0){
990
855
exitstatus = EXIT_FAILURE;
991
856
goto fallback;
992
857
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
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
}
998
871
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1001
874
if(ret < 0){
1002
875
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
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;
1012
883
}
1013
1014
884
/* This process exited nicely, so print its buffer */
1015
885
1016
886
bool bret = print_out_password(proc->buffer,
1017
887
proc->buffer_length);
1018
888
if(not bret){
1021
891
}
1022
892
goto fallback;
1023
893
}
1024
1025
894
/* This process has not completed. Does it have any output? */
1026
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
896
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
897
continue;
1030
898
}
1031
899
/* Before reading, make the process' data buffer large enough */
1032
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
902
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
903
if (proc->buffer == NULL){
1036
904
perror("malloc");
1037
905
exitstatus = EXIT_FAILURE;
1038
906
goto fallback;
1040
908
proc->buffer_size += BUFFER_SIZE;
1041
909
}
1042
910
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1046
914
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
915
continue;
1049
916
}
1050
if(sret == 0){
917
if(ret == 0){
1051
918
/* got EOF */
1052
919
proc->eof = true;
1053
920
} else {
1054
proc->buffer_length += (size_t) sret;
921
proc->buffer_length += (size_t) ret;
1055
922
}
1056
923
}
1057
924
}
1059
926
1060
927
fallback:
1061
928
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1063
930
/* Fallback if all plugins failed, none are found or an error
1064
931
occured */
1065
932
bool bret;
1066
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
934
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
936
if(not bret){
1076
937
perror("print_out_password");
1077
938
exitstatus = EXIT_FAILURE;
1084
945
perror("sigaction");
1085
946
exitstatus = EXIT_FAILURE;
1086
947
}
1087
948
1088
949
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1090
951
free(*arg);
1091
952
}
1092
953
free(custom_argv);
1093
954
}
955
free_plugin_list(plugin_list);
1094
956
1095
957
if(dir != NULL){
1096
958
closedir(dir);
1097
959
}
1098
960
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
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");
1108
969
}
970
free(process_list->buffer);
971
free(process_list);
1109
972
}
1110
973
1111
974
/* Wait for any remaining child processes to terminate */
1116
979
perror("wait");
1117
980
}
1118
981
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
982
return exitstatus;
1125
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0