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- Committer: Teddy Hogeborn
- Date: 2008-08-31 15:06:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20080831150639-tqdkyea3b9p3rou7
* Makefile: Make all DocBook rules include legalnotice.xml as a
dependency.
* legalnotice.xml: New file with just the <legalnotice> tag in it.
* mandos-clients.conf.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* mandos-keygen.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos-conf.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos.xml (/refentry/refentryinfo/legalnotice): - '' -
* overview.xml: Changed root node tag name in DOCTYPE declaration.
* plugin-runner.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-prompt.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-request.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
dependency.
* legalnotice.xml: New file with just the <legalnotice> tag in it.
* mandos-clients.conf.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* mandos-keygen.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos-conf.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos.xml (/refentry/refentryinfo/legalnotice): - '' -
* overview.xml: Changed root node tag name in DOCTYPE declaration.
* plugin-runner.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-prompt.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-request.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
- 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,
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
68
71
69
#define PDIR "/lib/mandos/plugins.d"
72
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
71
74
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
75
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
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
77
89
typedef struct plugin{
78
90
char *name; /* can be NULL or any plugin name */
79
91
char **argv;
81
93
char **environ;
82
94
int envc;
83
95
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile sig_atomic_t completed;
93
int status;
94
96
struct plugin *next;
95
97
} plugin;
96
98
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))){
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))){
106
103
return p;
107
104
}
108
105
}
109
106
/* Create a new plugin */
110
107
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
108
if (new_plugin == NULL){
112
109
return NULL;
113
110
}
114
111
char *copy_name = NULL;
115
112
if(name != NULL){
116
113
copy_name = strdup(name);
117
114
if(copy_name == NULL){
118
free(new_plugin);
119
115
return NULL;
120
116
}
121
117
}
122
118
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
127
124
128
125
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
130
127
free(copy_name);
131
128
free(new_plugin);
132
129
return NULL;
133
130
}
134
131
new_plugin->argv[0] = copy_name;
135
132
new_plugin->argv[1] = NULL;
136
133
137
134
new_plugin->environ = malloc(sizeof(char *));
138
135
if(new_plugin->environ == NULL){
139
136
free(copy_name);
142
139
return NULL;
143
140
}
144
141
new_plugin->environ[0] = NULL;
145
146
142
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
148
144
return new_plugin;
149
145
}
150
146
180
176
}
181
177
182
178
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
184
180
if(p == NULL){
185
181
return false;
186
182
}
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
183
return add_to_char_array(def, &(p->environ), &(p->envc));
205
184
}
206
185
186
207
187
/*
208
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
189
* Descriptor Flags".
210
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
191
*/
212
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
213
194
int ret = fcntl(fd, F_GETFD, 0);
214
195
/* If reading the flags failed, return error indication now. */
215
196
if(ret < 0){
219
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
201
}
221
202
203
process *process_list = NULL;
222
204
223
205
/* Mark processes as completed when they exit, and save their exit
224
206
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
227
208
while(true){
228
plugin *proc = plugin_list;
209
process *proc = process_list;
229
210
int status;
230
211
pid_t pid = waitpid(-1, &status, WNOHANG);
231
212
if(pid == 0){
233
214
break;
234
215
}
235
216
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
217
if (errno != ECHILD){
218
perror("waitpid");
239
219
}
240
perror("waitpid");
220
/* No child processes */
221
break;
241
222
}
242
223
243
224
/* A child exited, find it in process_list */
244
225
while(proc != NULL and proc->pid != pid){
245
226
proc = proc->next;
249
230
continue;
250
231
}
251
232
proc->status = status;
252
proc->completed = 1;
233
proc->completed = true;
253
234
}
254
errno = old_errno;
255
235
}
256
236
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
259
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
260
242
for(size_t written = 0; written < length; written += (size_t)ret){
261
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
244
length - written));
267
249
return true;
268
250
}
269
251
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
294
}
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
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);
303
264
}
304
265
}
305
266
312
273
struct dirent *dirst;
313
274
struct stat st;
314
275
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
276
int ret, maxfd = 0;
318
277
uid_t uid = 65534;
319
278
gid_t gid = 65534;
320
279
bool debug = false;
345
304
{ .name = "global-options", .key = 'g',
346
305
.arg = "OPTION[,OPTION[,...]]",
347
306
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
349
308
.arg = "VAR=value",
350
309
.doc = "Environment variable passed to all plugins" },
351
310
{ .name = "options-for", .key = 'o',
352
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
312
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
355
314
.arg = "PLUGIN:ENV=value",
356
315
.doc = "Environment variable passed to specified plugin" },
357
316
{ .name = "disable", .key = 'd',
358
317
.arg = "PLUGIN",
359
318
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
319
{ .name = "plugin-dir", .key = 128,
364
320
.arg = "DIRECTORY",
365
321
.doc = "Specify a different plugin directory", .group = 2 },
377
333
{ .name = NULL }
378
334
};
379
335
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *plugin_option;
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
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'){
388
346
continue;
389
347
}
390
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
391
349
perror("add_argument");
392
350
return ARGP_ERR_UNKNOWN;
393
351
}
394
352
}
395
353
}
396
354
break;
397
case 'G': /* --global-env */
355
case 'e':
398
356
if(arg == NULL){
399
357
break;
400
358
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
403
367
}
404
368
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
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
}
416
389
}
417
390
}
418
391
}
419
392
break;
420
case 'E': /* --env-for */
393
case 'f':
421
394
if(arg == NULL){
422
395
break;
423
396
}
426
399
if(envdef == NULL){
427
400
break;
428
401
}
429
*envdef = '\0';
430
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)){
431
408
perror("add_environment");
432
409
}
433
410
}
434
411
break;
435
case 'd': /* --disable */
436
if(arg != NULL){
437
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
438
415
if(p == NULL){
439
416
return ARGP_ERR_UNKNOWN;
440
417
}
441
418
p->disabled = true;
442
419
}
443
420
break;
444
case 'e': /* --enable */
445
if(arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
421
case 128:
455
422
plugindir = strdup(arg);
456
423
if(plugindir == NULL){
457
424
perror("strdup");
458
425
}
459
426
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
471
}
472
break;
473
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
481
}
482
break;
483
case 132: /* --debug */
484
debug = true;
485
break;
486
/*
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
489
*/
490
case ARGP_KEY_ARG:
491
/* Cryptsetup always passes an argument, which is an empty
492
string if "none" was specified in /etc/crypttab. So if
493
argument was empty, we ignore it silently. */
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
496
}
497
break;
498
case ARGP_KEY_END:
499
break;
500
default:
501
return ARGP_ERR_UNKNOWN;
502
}
503
return 0;
504
}
505
506
/* This option parser is the same as parse_opt() above, except it
507
ignores everything but the --config-file option. */
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
511
switch(key){
512
case 'g': /* --global-options */
513
case 'G': /* --global-env */
514
case 'o': /* --options-for */
515
case 'E': /* --env-for */
516
case 'd': /* --disable */
517
case 'e': /* --enable */
518
case 128: /* --plugin-dir */
519
break;
520
case 129: /* --config-file */
521
free(argfile);
427
case 129:
522
428
argfile = strdup(arg);
523
429
if(argfile == NULL){
524
430
perror("strdup");
525
431
}
526
432
break;
527
case 130: /* --userid */
528
case 131: /* --groupid */
529
case 132: /* --debug */
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;
530
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
531
445
case ARGP_KEY_END:
532
446
break;
533
447
default:
536
450
return 0;
537
451
}
538
452
539
struct argp argp = { .options = options,
540
.parser = parse_opt_config_file,
541
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
542
457
.doc = "Mandos plugin runner -- Run plugins" };
543
458
544
/* Parse using parse_opt_config_file() in order to get the custom
545
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
548
461
fprintf(stderr, "Unknown error while parsing arguments\n");
549
462
exitstatus = EXIT_FAILURE;
550
463
goto fallback;
551
464
}
552
553
/* Reset to the normal argument parser */
554
argp.parser = parse_opt;
555
556
/* Open the configfile if available */
557
if(argfile == NULL){
465
466
if (argfile == NULL){
558
467
conffp = fopen(AFILE, "r");
559
468
} else {
560
469
conffp = fopen(argfile, "r");
561
}
470
}
471
562
472
if(conffp != NULL){
563
473
char *org_line = NULL;
564
474
char *p, *arg, *new_arg, *line;
565
475
size_t size = 0;
476
ssize_t sret;
566
477
const char whitespace_delims[] = " \r\t\f\v\n";
567
478
const char comment_delim[] = "#";
568
479
575
486
}
576
487
custom_argv[0] = argv[0];
577
488
custom_argv[1] = NULL;
578
579
/* for each line in the config file, strip whitespace and ignore
580
commented text */
489
581
490
while(true){
582
491
sret = getline(&org_line, &size, conffp);
583
492
if(sret == -1){
612
521
}
613
522
}
614
523
free(org_line);
615
} else {
524
} else{
616
525
/* Check for harmful errors and go to fallback. Other errors might
617
526
not affect opening plugins */
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
619
528
perror("fopen");
620
529
exitstatus = EXIT_FAILURE;
621
530
goto fallback;
622
531
}
623
532
}
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
533
626
534
if(custom_argv != NULL){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
630
537
fprintf(stderr, "Unknown error while parsing arguments\n");
631
538
exitstatus = EXIT_FAILURE;
632
539
goto fallback;
633
540
}
634
541
}
635
542
636
/* Parse actual command line arguments, to let them override the
637
config file */
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
642
goto fallback;
643
}
644
645
543
if(debug){
646
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
647
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
649
547
for(char **a = p->argv; *a != NULL; a++){
650
548
fprintf(stderr, "\tArg: %s\n", *a);
651
549
}
652
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
653
551
for(char **a = p->environ; *a != NULL; a++){
654
552
fprintf(stderr, "\t%s\n", *a);
655
553
}
656
554
}
657
555
}
658
556
659
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
660
562
setgid(gid);
661
if(ret == -1){
563
if (ret == -1){
662
564
perror("setgid");
663
565
}
664
ret = setuid(uid);
665
if(ret == -1){
666
perror("setuid");
667
}
668
669
if(plugindir == NULL){
566
567
if (plugindir == NULL){
670
568
dir = opendir(PDIR);
671
569
} else {
672
570
dir = opendir(plugindir);
693
591
694
592
FD_ZERO(&rfds_all);
695
593
696
/* Read and execute any executable in the plugin directory*/
697
594
while(true){
698
595
dirst = readdir(dir);
699
596
700
/* All directory entries have been processed */
597
// All directory entries have been processed
701
598
if(dirst == NULL){
702
if(errno == EBADF){
599
if (errno == EBADF){
703
600
perror("readdir");
704
601
exitstatus = EXIT_FAILURE;
705
602
goto fallback;
709
606
710
607
d_name_len = strlen(dirst->d_name);
711
608
712
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
713
610
{
714
611
bool bad_name = false;
715
612
717
614
718
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
719
616
".dpkg-old",
720
".dpkg-bak",
721
617
".dpkg-divert", NULL };
722
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
723
619
size_t pre_len = strlen(*pre);
731
627
break;
732
628
}
733
629
}
630
734
631
if(bad_name){
735
632
continue;
736
633
}
634
737
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
738
636
size_t suf_len = strlen(*suf);
739
637
if((d_name_len >= suf_len)
754
652
}
755
653
756
654
char *filename;
757
if(plugindir == NULL){
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
759
} else {
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
656
if(ret < 0){
763
657
perror("asprintf");
764
658
continue;
765
659
}
766
660
767
661
ret = stat(filename, &st);
768
if(ret == -1){
662
if (ret == -1){
769
663
perror("stat");
770
664
free(filename);
771
665
continue;
772
666
}
773
774
/* Ignore non-executable files */
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
776
669
if(debug){
777
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
778
671
" with bad type or mode\n", filename);
780
673
free(filename);
781
674
continue;
782
675
}
783
784
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
785
677
if(p == NULL){
786
678
perror("getplugin");
787
679
free(filename);
797
689
}
798
690
{
799
691
/* Add global arguments to argument list for this plugin */
800
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
801
693
if(g != NULL){
802
694
for(char **a = g->argv + 1; *a != NULL; a++){
803
695
if(not add_argument(p, *a)){
806
698
}
807
699
/* Add global environment variables */
808
700
for(char **e = g->environ; *e != NULL; e++){
809
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
810
702
perror("add_environment");
811
703
}
812
704
}
817
709
process, too. */
818
710
if(p->environ[0] != NULL){
819
711
for(char **e = environ; *e != NULL; e++){
820
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)){
821
718
perror("add_environment");
822
719
}
823
720
}
825
722
826
723
int pipefd[2];
827
724
ret = pipe(pipefd);
828
if(ret == -1){
725
if (ret == -1){
829
726
perror("pipe");
830
727
exitstatus = EXIT_FAILURE;
831
728
goto fallback;
832
729
}
833
/* Ask OS to automatic close the pipe on exec */
834
730
ret = set_cloexec_flag(pipefd[0]);
835
731
if(ret < 0){
836
732
perror("set_cloexec_flag");
844
740
goto fallback;
845
741
}
846
742
/* Block SIGCHLD until process is safely in process list */
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
848
744
if(ret < 0){
849
745
perror("sigprocmask");
850
746
exitstatus = EXIT_FAILURE;
851
747
goto fallback;
852
748
}
853
/* Starting a new process to be watched */
749
// Starting a new process to be watched
854
750
pid_t pid = fork();
855
751
if(pid == -1){
856
752
perror("fork");
864
760
perror("sigaction");
865
761
_exit(EXIT_FAILURE);
866
762
}
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
868
764
if(ret < 0){
869
765
perror("sigprocmask");
870
766
_exit(EXIT_FAILURE);
871
767
}
872
768
873
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
874
770
if(ret == -1){
875
771
perror("dup2");
894
790
}
895
791
/* no return */
896
792
}
897
/* Parent process */
898
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
899
794
free(filename);
900
plugin *new_plugin = getplugin(dirst->d_name);
901
if(new_plugin == NULL){
902
perror("getplugin");
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
904
800
if(ret < 0){
905
perror("sigprocmask");
801
perror("sigprocmask");
906
802
}
907
803
exitstatus = EXIT_FAILURE;
908
804
goto fallback;
909
805
}
910
806
911
new_plugin->pid = pid;
912
new_plugin->fd = pipefd[0];
913
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
914
812
/* Unblock SIGCHLD so signal handler can be run if this process
915
813
has already completed */
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
917
815
if(ret < 0){
918
816
perror("sigprocmask");
919
817
exitstatus = EXIT_FAILURE;
920
818
goto fallback;
921
819
}
922
820
923
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
924
822
925
if(maxfd < new_plugin->fd){
926
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
927
825
}
826
928
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
929
831
930
832
closedir(dir);
931
833
dir = NULL;
932
free_plugin(getplugin(NULL));
933
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
935
if(p->pid != 0){
936
break;
937
}
938
if(p->next == NULL){
939
fprintf(stderr, "No plugin processes started. Incorrect plugin"
940
" directory?\n");
941
free_plugin_list();
942
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
943
839
}
944
945
/* Main loop while running plugins exist */
946
while(plugin_list){
840
while(process_list){
947
841
fd_set rfds = rfds_all;
948
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
949
if(select_ret == -1){
843
if (select_ret == -1){
950
844
perror("select");
951
845
exitstatus = EXIT_FAILURE;
952
846
goto fallback;
953
847
}
954
848
/* OK, now either a process completed, or something can be read
955
849
from one of them */
956
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
957
851
/* Is this process completely done? */
958
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
959
853
/* Only accept the plugin output if it exited cleanly */
960
854
if(not WIFEXITED(proc->status)
961
855
or WEXITSTATUS(proc->status) != 0){
962
856
/* Bad exit by plugin */
963
964
857
if(debug){
965
858
if(WIFEXITED(proc->status)){
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
969
861
WEXITSTATUS(proc->status));
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
974
865
WTERMSIG(proc->status));
975
866
} else if(WCOREDUMP(proc->status)){
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
978
869
}
979
870
}
980
981
871
/* Remove the plugin */
982
872
FD_CLR(proc->fd, &rfds_all);
983
984
873
/* Block signal while modifying process_list */
985
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
986
875
if(ret < 0){
988
877
exitstatus = EXIT_FAILURE;
989
878
goto fallback;
990
879
}
991
992
plugin *next_plugin = proc->next;
993
free_plugin(proc);
994
proc = next_plugin;
995
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
}
996
893
/* We are done modifying process list, so unblock signal */
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
999
896
if(ret < 0){
1000
897
perror("sigprocmask");
1001
exitstatus = EXIT_FAILURE;
1002
goto fallback;
1003
}
1004
1005
if(plugin_list == NULL){
1006
break;
1007
}
1008
1009
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;
1010
905
}
1011
1012
906
/* This process exited nicely, so print its buffer */
1013
907
1014
908
bool bret = print_out_password(proc->buffer,
1015
909
proc->buffer_length);
1016
910
if(not bret){
1019
913
}
1020
914
goto fallback;
1021
915
}
1022
1023
916
/* This process has not completed. Does it have any output? */
1024
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1025
918
/* This process had nothing to say at this time */
1026
proc = proc->next;
1027
919
continue;
1028
920
}
1029
921
/* Before reading, make the process' data buffer large enough */
1030
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1031
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1032
924
+ (size_t) BUFFER_SIZE);
1033
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1034
926
perror("malloc");
1035
927
exitstatus = EXIT_FAILURE;
1036
928
goto fallback;
1038
930
proc->buffer_size += BUFFER_SIZE;
1039
931
}
1040
932
/* Read from the process */
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1043
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1044
936
/* Read error from this process; ignore the error */
1045
proc = proc->next;
1046
937
continue;
1047
938
}
1048
if(sret == 0){
939
if(ret == 0){
1049
940
/* got EOF */
1050
941
proc->eof = true;
1051
942
} else {
1052
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1053
944
}
1054
945
}
1055
946
}
1057
948
1058
949
fallback:
1059
950
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1061
952
/* Fallback if all plugins failed, none are found or an error
1062
953
occured */
1063
954
bool bret;
1064
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1065
956
char *passwordbuffer = getpass("Password: ");
1066
size_t len = strlen(passwordbuffer);
1067
/* Strip trailing newline */
1068
if(len > 0 and passwordbuffer[len-1] == '\n'){
1069
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1070
len--;
1071
}
1072
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1073
958
if(not bret){
1074
959
perror("print_out_password");
1075
960
exitstatus = EXIT_FAILURE;
1082
967
perror("sigaction");
1083
968
exitstatus = EXIT_FAILURE;
1084
969
}
1085
970
1086
971
if(custom_argv != NULL){
1087
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1088
973
free(*arg);
1089
974
}
1090
975
free(custom_argv);
1091
976
}
977
free_plugin_list(plugin_list);
1092
978
1093
979
if(dir != NULL){
1094
980
closedir(dir);
1095
981
}
1096
982
1097
/* Kill the processes */
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1099
if(p->pid != 0){
1100
close(p->fd);
1101
ret = kill(p->pid, SIGTERM);
1102
if(ret == -1 and errno != ESRCH){
1103
/* Set-uid proccesses might not get closed */
1104
perror("kill");
1105
}
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");
1106
991
}
992
free(process_list->buffer);
993
free(process_list);
1107
994
}
1108
995
1109
996
/* Wait for any remaining child processes to terminate */
1113
1000
if(errno != ECHILD){
1114
1001
perror("wait");
1115
1002
}
1116
1117
free_plugin_list();
1118
1003
1119
1004
free(plugindir);
1120
1005
free(argfile);
1121
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0