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- Committer: Teddy Hogeborn
- Date: 2008-08-29 05:53:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20080829055359-wkdasnyxtylmnxus
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
"&COMMANDNAME;".
* plugins.d/password-prompt.c (main): Improved some documentation
strings. Do perror() of
tcgetattr() fails. Add debug
output if interrupted by signal.
Loop over write() instead of
using fwrite() when outputting
password. Add debug output if
getline() returns 0, unless it
was caused by a signal. Add
exit status code to debug
output.
* plugins.d/password-prompt.xml: Changed all single quotes to double
quotes for consistency. Removed
<?xml-stylesheet>.
(ENTITY TIMESTAMP): New. Automatically updated by Emacs time-stamp
by using Emacs local variables.
(/refentry/refentryinfo/title): Changed to "Mandos Manual".
(/refentry/refentryinfo/productname): Changed to "Mandos".
(/refentry/refentryinfo/date): New; set to "&TIMESTAMP;".
(/refentry/refentryinfo/copyright): Split copyright holders.
(/refentry/refnamediv/refpurpose): Improved wording.
(SYNOPSIS): Fix to use correct markup. Add short options.
(DESCRIPTION, OPTIONS): Improved wording.
(OPTIONS): Improved wording. Use more correct markup. Document
short options.
(EXIT STATUS): Add text.
(ENVIRONMENT): Document use of "cryptsource" and "crypttarget".
(FILES): REMOVED.
(BUGS): Add text.
(EXAMPLE): Added some examples.
(SECURITY): Added text.
(SEE ALSO): Remove reference to mandos(8). Add reference to
crypttab(5).
"&COMMANDNAME;".
* plugins.d/password-prompt.c (main): Improved some documentation
strings. Do perror() of
tcgetattr() fails. Add debug
output if interrupted by signal.
Loop over write() instead of
using fwrite() when outputting
password. Add debug output if
getline() returns 0, unless it
was caused by a signal. Add
exit status code to debug
output.
* plugins.d/password-prompt.xml: Changed all single quotes to double
quotes for consistency. Removed
<?xml-stylesheet>.
(ENTITY TIMESTAMP): New. Automatically updated by Emacs time-stamp
by using Emacs local variables.
(/refentry/refentryinfo/title): Changed to "Mandos Manual".
(/refentry/refentryinfo/productname): Changed to "Mandos".
(/refentry/refentryinfo/date): New; set to "&TIMESTAMP;".
(/refentry/refentryinfo/copyright): Split copyright holders.
(/refentry/refnamediv/refpurpose): Improved wording.
(SYNOPSIS): Fix to use correct markup. Add short options.
(DESCRIPTION, OPTIONS): Improved wording.
(OPTIONS): Improved wording. Use more correct markup. Document
short options.
(EXIT STATUS): Add text.
(ENVIRONMENT): Document use of "cryptsource" and "crypttarget".
(FILES): REMOVED.
(BUGS): Add text.
(EXAMPLE): Added some examples.
(SECURITY): Added text.
(SEE ALSO): Remove reference to mandos(8). Add reference to
crypttab(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:
- .bzrignore
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,
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
SIG_UNBLOCK, kill() */
67
65
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
66
70
67
#define BUFFER_SIZE 256
71
68
72
69
#define PDIR "/lib/mandos/plugins.d"
73
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
71
75
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
76
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
88
78
89
typedef struct plugin{
79
90
char *name; /* can be NULL or any plugin name */
80
91
char **argv;
82
93
char **environ;
83
94
int envc;
84
95
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
95
96
struct plugin *next;
96
97
} plugin;
97
98
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
107
103
return p;
108
104
}
109
105
}
110
106
/* Create a new plugin */
111
107
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
108
if (new_plugin == NULL){
113
109
return NULL;
114
110
}
115
111
char *copy_name = NULL;
116
112
if(name != NULL){
117
113
copy_name = strdup(name);
118
114
if(copy_name == NULL){
119
free(new_plugin);
120
115
return NULL;
121
116
}
122
117
}
123
118
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
128
124
129
125
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
131
127
free(copy_name);
132
128
free(new_plugin);
133
129
return NULL;
134
130
}
135
131
new_plugin->argv[0] = copy_name;
136
132
new_plugin->argv[1] = NULL;
137
133
138
134
new_plugin->environ = malloc(sizeof(char *));
139
135
if(new_plugin->environ == NULL){
140
136
free(copy_name);
143
139
return NULL;
144
140
}
145
141
new_plugin->environ[0] = NULL;
146
147
142
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
149
144
return new_plugin;
150
145
}
151
146
181
176
}
182
177
183
178
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
185
180
if(p == NULL){
186
181
return false;
187
182
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
183
return add_to_char_array(def, &(p->environ), &(p->envc));
206
184
}
207
185
186
208
187
/*
209
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
189
* Descriptor Flags".
211
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
191
*/
213
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
214
194
int ret = fcntl(fd, F_GETFD, 0);
215
195
/* If reading the flags failed, return error indication now. */
216
196
if(ret < 0){
220
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
201
}
222
202
203
process *process_list = NULL;
223
204
224
205
/* Mark processes as completed when they exit, and save their exit
225
206
status. */
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
228
208
while(true){
229
plugin *proc = plugin_list;
209
process *proc = process_list;
230
210
int status;
231
211
pid_t pid = waitpid(-1, &status, WNOHANG);
232
212
if(pid == 0){
234
214
break;
235
215
}
236
216
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
217
if (errno != ECHILD){
218
perror("waitpid");
240
219
}
241
perror("waitpid");
220
/* No child processes */
221
break;
242
222
}
243
223
244
224
/* A child exited, find it in process_list */
245
225
while(proc != NULL and proc->pid != pid){
246
226
proc = proc->next;
250
230
continue;
251
231
}
252
232
proc->status = status;
253
proc->completed = 1;
233
proc->completed = true;
254
234
}
255
errno = old_errno;
256
235
}
257
236
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
260
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
261
242
for(size_t written = 0; written < length; written += (size_t)ret){
262
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
244
length - written));
268
249
return true;
269
250
}
270
251
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
304
264
}
305
265
}
306
266
314
274
struct stat st;
315
275
fd_set rfds_all;
316
276
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
319
277
uid_t uid = 65534;
320
278
gid_t gid = 65534;
321
279
bool debug = false;
346
304
{ .name = "global-options", .key = 'g',
347
305
.arg = "OPTION[,OPTION[,...]]",
348
306
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
350
308
.arg = "VAR=value",
351
309
.doc = "Environment variable passed to all plugins" },
352
310
{ .name = "options-for", .key = 'o',
353
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
312
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
356
314
.arg = "PLUGIN:ENV=value",
357
315
.doc = "Environment variable passed to specified plugin" },
358
316
{ .name = "disable", .key = 'd',
359
317
.arg = "PLUGIN",
360
318
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
364
319
{ .name = "plugin-dir", .key = 128,
365
320
.arg = "DIRECTORY",
366
321
.doc = "Specify a different plugin directory", .group = 2 },
378
333
{ .name = NULL }
379
334
};
380
335
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
390
346
continue;
391
347
}
392
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
393
349
perror("add_argument");
394
350
return ARGP_ERR_UNKNOWN;
395
351
}
396
352
}
397
353
}
398
354
break;
399
case 'G': /* --global-env */
355
case 'e':
400
356
if(arg == NULL){
401
357
break;
402
358
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
405
367
}
406
368
break;
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
418
389
}
419
390
}
420
391
}
421
392
break;
422
case 'E': /* --env-for */
393
case 'f':
423
394
if(arg == NULL){
424
395
break;
425
396
}
428
399
if(envdef == NULL){
429
400
break;
430
401
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
433
408
perror("add_environment");
434
409
}
435
410
}
436
411
break;
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
440
415
if(p == NULL){
441
416
return ARGP_ERR_UNKNOWN;
442
417
}
443
418
p->disabled = true;
444
419
}
445
420
break;
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
421
case 128:
457
422
plugindir = strdup(arg);
458
423
if(plugindir == NULL){
459
424
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
488
debug = true;
489
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
425
}
426
break;
427
case 129:
526
428
argfile = strdup(arg);
527
429
if(argfile == NULL){
528
430
perror("strdup");
529
431
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
534
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
535
445
case ARGP_KEY_END:
536
446
break;
537
447
default:
540
450
return 0;
541
451
}
542
452
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
546
457
.doc = "Mandos plugin runner -- Run plugins" };
547
458
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
552
461
fprintf(stderr, "Unknown error while parsing arguments\n");
553
462
exitstatus = EXIT_FAILURE;
554
463
goto fallback;
555
464
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
465
466
if (argfile == NULL){
562
467
conffp = fopen(AFILE, "r");
563
468
} else {
564
469
conffp = fopen(argfile, "r");
565
470
}
471
566
472
if(conffp != NULL){
567
473
char *org_line = NULL;
568
474
char *p, *arg, *new_arg, *line;
569
475
size_t size = 0;
476
ssize_t sret;
570
477
const char whitespace_delims[] = " \r\t\f\v\n";
571
478
const char comment_delim[] = "#";
572
479
573
480
custom_argc = 1;
574
481
custom_argv = malloc(sizeof(char*) * 2);
575
482
if(custom_argv == NULL){
580
487
custom_argv[0] = argv[0];
581
488
custom_argv[1] = NULL;
582
489
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
585
490
while(true){
586
491
sret = getline(&org_line, &size, conffp);
587
492
if(sret == -1){
588
493
break;
589
494
}
590
495
591
496
line = org_line;
592
497
arg = strsep(&line, comment_delim);
593
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
612
517
goto fallback;
613
518
}
614
519
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
616
521
}
617
522
}
618
523
free(org_line);
619
} else {
524
} else{
620
525
/* Check for harmful errors and go to fallback. Other errors might
621
526
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
528
perror("fopen");
624
529
exitstatus = EXIT_FAILURE;
625
530
goto fallback;
626
531
}
627
532
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
533
630
534
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
634
537
fprintf(stderr, "Unknown error while parsing arguments\n");
635
538
exitstatus = EXIT_FAILURE;
636
539
goto fallback;
637
540
}
638
541
}
639
542
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
543
if(debug){
650
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
547
for(char **a = p->argv; *a != NULL; a++){
654
548
fprintf(stderr, "\tArg: %s\n", *a);
655
549
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
551
for(char **a = p->environ; *a != NULL; a++){
658
552
fprintf(stderr, "\t%s\n", *a);
659
553
}
660
554
}
661
555
}
662
556
663
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
664
562
setgid(gid);
665
if(ret == -1){
563
if (ret == -1){
666
564
perror("setgid");
667
565
}
668
ret = setuid(uid);
669
if(ret == -1){
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
566
567
if (plugindir == NULL){
674
568
dir = opendir(PDIR);
675
569
} else {
676
570
dir = opendir(plugindir);
697
591
698
592
FD_ZERO(&rfds_all);
699
593
700
/* Read and execute any executable in the plugin directory*/
701
594
while(true){
702
595
dirst = readdir(dir);
703
596
704
/* All directory entries have been processed */
597
// All directory entries have been processed
705
598
if(dirst == NULL){
706
if(errno == EBADF){
599
if (errno == EBADF){
707
600
perror("readdir");
708
601
exitstatus = EXIT_FAILURE;
709
602
goto fallback;
713
606
714
607
d_name_len = strlen(dirst->d_name);
715
608
716
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
717
610
{
718
611
bool bad_name = false;
719
612
721
614
722
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
616
".dpkg-old",
724
".dpkg-bak",
725
617
".dpkg-divert", NULL };
726
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
619
size_t pre_len = strlen(*pre);
735
627
break;
736
628
}
737
629
}
630
738
631
if(bad_name){
739
632
continue;
740
633
}
634
741
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
636
size_t suf_len = strlen(*suf);
743
637
if((d_name_len >= suf_len)
756
650
continue;
757
651
}
758
652
}
759
653
760
654
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
656
if(ret < 0){
767
657
perror("asprintf");
768
658
continue;
769
659
}
770
660
771
661
ret = stat(filename, &st);
772
if(ret == -1){
662
if (ret == -1){
773
663
perror("stat");
774
664
free(filename);
775
665
continue;
776
666
}
777
667
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
669
if(debug){
781
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
671
" with bad type or mode\n", filename);
784
673
free(filename);
785
674
continue;
786
675
}
787
788
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
677
if(p == NULL){
790
678
perror("getplugin");
791
679
free(filename);
801
689
}
802
690
{
803
691
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
805
693
if(g != NULL){
806
694
for(char **a = g->argv + 1; *a != NULL; a++){
807
695
if(not add_argument(p, *a)){
810
698
}
811
699
/* Add global environment variables */
812
700
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
814
702
perror("add_environment");
815
703
}
816
704
}
821
709
process, too. */
822
710
if(p->environ[0] != NULL){
823
711
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
825
718
perror("add_environment");
826
719
}
827
720
}
829
722
830
723
int pipefd[2];
831
724
ret = pipe(pipefd);
832
if(ret == -1){
725
if (ret == -1){
833
726
perror("pipe");
834
727
exitstatus = EXIT_FAILURE;
835
728
goto fallback;
836
729
}
837
/* Ask OS to automatic close the pipe on exec */
838
730
ret = set_cloexec_flag(pipefd[0]);
839
731
if(ret < 0){
840
732
perror("set_cloexec_flag");
848
740
goto fallback;
849
741
}
850
742
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
744
if(ret < 0){
853
745
perror("sigprocmask");
854
746
exitstatus = EXIT_FAILURE;
855
747
goto fallback;
856
748
}
857
/* Starting a new process to be watched */
749
// Starting a new process to be watched
858
750
pid_t pid = fork();
859
751
if(pid == -1){
860
752
perror("fork");
868
760
perror("sigaction");
869
761
_exit(EXIT_FAILURE);
870
762
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
764
if(ret < 0){
873
765
perror("sigprocmask");
874
766
_exit(EXIT_FAILURE);
875
767
}
876
768
877
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
770
if(ret == -1){
879
771
perror("dup2");
898
790
}
899
791
/* no return */
900
792
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
903
794
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
800
if(ret < 0){
909
perror("sigprocmask");
801
perror("sigprocmask");
910
802
}
911
803
exitstatus = EXIT_FAILURE;
912
804
goto fallback;
913
805
}
914
806
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
918
812
/* Unblock SIGCHLD so signal handler can be run if this process
919
813
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
815
if(ret < 0){
922
816
perror("sigprocmask");
923
817
exitstatus = EXIT_FAILURE;
924
818
goto fallback;
925
819
}
926
820
927
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
928
822
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
931
825
}
826
932
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
933
831
934
832
closedir(dir);
935
833
dir = NULL;
936
free_plugin(getplugin(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
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
947
839
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
840
while(process_list){
951
841
fd_set rfds = rfds_all;
952
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
843
if (select_ret == -1){
954
844
perror("select");
955
845
exitstatus = EXIT_FAILURE;
956
846
goto fallback;
957
847
}
958
848
/* OK, now either a process completed, or something can be read
959
849
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
961
851
/* Is this process completely done? */
962
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
963
853
/* Only accept the plugin output if it exited cleanly */
964
854
if(not WIFEXITED(proc->status)
965
855
or WEXITSTATUS(proc->status) != 0){
966
856
/* Bad exit by plugin */
967
968
857
if(debug){
969
858
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
973
861
WEXITSTATUS(proc->status));
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
978
865
WTERMSIG(proc->status));
979
866
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
982
869
}
983
870
}
984
985
871
/* Remove the plugin */
986
872
FD_CLR(proc->fd, &rfds_all);
987
988
873
/* Block signal while modifying process_list */
989
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
875
if(ret < 0){
992
877
exitstatus = EXIT_FAILURE;
993
878
goto fallback;
994
879
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1000
893
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1003
896
if(ret < 0){
1004
897
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1014
905
}
1015
1016
906
/* This process exited nicely, so print its buffer */
1017
907
1018
908
bool bret = print_out_password(proc->buffer,
1019
909
proc->buffer_length);
1020
910
if(not bret){
1023
913
}
1024
914
goto fallback;
1025
915
}
1026
1027
916
/* This process has not completed. Does it have any output? */
1028
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
918
/* This process had nothing to say at this time */
1030
proc = proc->next;
1031
919
continue;
1032
920
}
1033
921
/* Before reading, make the process' data buffer large enough */
1034
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
924
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1038
926
perror("malloc");
1039
927
exitstatus = EXIT_FAILURE;
1040
928
goto fallback;
1042
930
proc->buffer_size += BUFFER_SIZE;
1043
931
}
1044
932
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1048
936
/* Read error from this process; ignore the error */
1049
proc = proc->next;
1050
937
continue;
1051
938
}
1052
if(sret == 0){
939
if(ret == 0){
1053
940
/* got EOF */
1054
941
proc->eof = true;
1055
942
} else {
1056
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1057
944
}
1058
945
}
1059
946
}
1060
1061
947
948
1062
949
fallback:
1063
950
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1065
952
/* Fallback if all plugins failed, none are found or an error
1066
953
occured */
1067
954
bool bret;
1068
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
956
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1077
958
if(not bret){
1078
959
perror("print_out_password");
1079
960
exitstatus = EXIT_FAILURE;
1086
967
perror("sigaction");
1087
968
exitstatus = EXIT_FAILURE;
1088
969
}
1089
970
1090
971
if(custom_argv != NULL){
1091
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
973
free(*arg);
1093
974
}
1094
975
free(custom_argv);
1095
976
}
977
free_plugin_list(plugin_list);
1096
978
1097
979
if(dir != NULL){
1098
980
closedir(dir);
1099
981
}
1100
982
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1110
991
}
992
free(process_list->buffer);
993
free(process_list);
1111
994
}
1112
995
1113
996
/* Wait for any remaining child processes to terminate */
1117
1000
if(errno != ECHILD){
1118
1001
perror("wait");
1119
1002
}
1120
1121
free_plugin_list();
1122
1003
1123
1004
free(plugindir);
1124
1005
free(argfile);
1125
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0