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- Committer: Teddy Hogeborn
- Date: 2008-08-11 08:04:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20080811080435-7qfkwv5g43ww5h9x
* plugins.d/password-request.c (main): Bug fix: Bring up network
interface *before* dropping
privileges.
interface *before* dropping
privileges.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
mandos-client.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
66
67
67
#define BUFFER_SIZE 256
68
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
69
const char *argp_program_version = "mandos-client 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
75
typedef struct plugin{
76
char *name; /* can be NULL or any plugin name */
77
char **argv;
78
int argc;
79
char **environ;
80
int envc;
81
bool disabled;
72
struct process;
82
73
83
/* Variables used for running processes*/
74
typedef struct process{
84
75
pid_t pid;
85
76
int fd;
86
77
char *buffer;
87
78
size_t buffer_size;
88
79
size_t buffer_length;
89
80
bool eof;
90
volatile bool completed;
91
volatile int status;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
92
91
struct plugin *next;
93
92
} plugin;
94
93
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
102
96
if ((p->name == name)
103
97
or (p->name and name and (strcmp(p->name, name) == 0))){
104
98
return p;
107
101
/* Create a new plugin */
108
102
plugin *new_plugin = malloc(sizeof(plugin));
109
103
if (new_plugin == NULL){
110
return NULL;
111
}
112
char *copy_name = NULL;
113
if(name != NULL){
114
copy_name = strdup(name);
115
if(copy_name == NULL){
116
return NULL;
117
}
118
}
119
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
124
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
125
108
new_plugin->argv = malloc(sizeof(char *) * 2);
126
109
if (new_plugin->argv == NULL){
127
free(copy_name);
128
free(new_plugin);
129
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
130
112
}
131
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
132
114
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
135
if(new_plugin->environ == NULL){
136
free(copy_name);
137
free(new_plugin->argv);
138
free(new_plugin);
139
return NULL;
140
}
141
new_plugin->environ[0] = NULL;
142
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
143
118
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
145
120
return new_plugin;
146
121
}
147
122
148
/* Helper function for add_argument and add_environment */
149
static bool add_to_char_array(const char *new, char ***array,
150
int *len){
151
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
154
/* Malloc check */
155
if(*array == NULL){
156
return false;
157
}
158
/* Make a copy of the new string */
159
char *copy = strdup(new);
160
if(copy == NULL){
161
return false;
162
}
163
/* Insert the copy */
164
(*array)[*len] = copy;
165
(*len)++;
166
/* Add a new terminating NULL pointer to the last element */
167
(*array)[*len] = NULL;
168
return true;
169
}
170
171
/* Add to a plugin's argument vector */
172
static bool add_argument(plugin *p, const char *arg){
173
if(p == NULL){
174
return false;
175
}
176
return add_to_char_array(arg, &(p->argv), &(p->argc));
177
}
178
179
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
181
if(p == NULL){
182
return false;
183
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
201
return add_to_char_array(def, &(p->environ), &(p->envc));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
202
132
}
203
133
204
134
/*
206
136
* Descriptor Flags".
207
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
138
*/
209
static int set_cloexec_flag(int fd){
139
static int set_cloexec_flag(int fd)
140
{
210
141
int ret = fcntl(fd, F_GETFD, 0);
211
142
/* If reading the flags failed, return error indication now. */
212
143
if(ret < 0){
216
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
148
}
218
149
150
process *process_list = NULL;
219
151
220
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
221
153
status. */
222
static void handle_sigchld(__attribute__((unused)) int sig){
223
while(true){
224
plugin *proc = plugin_list;
225
int status;
226
pid_t pid = waitpid(-1, &status, WNOHANG);
227
if(pid == 0){
228
/* Only still running child processes */
229
break;
230
}
231
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
234
}
235
/* No child processes */
236
break;
237
}
238
239
/* A child exited, find it in process_list */
240
while(proc != NULL and proc->pid != pid){
241
proc = proc->next;
242
}
243
if(proc == NULL){
244
/* Process not found in process list */
245
continue;
246
}
247
proc->status = status;
248
proc->completed = true;
249
}
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
250
171
}
251
172
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
254
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
255
178
for(size_t written = 0; written < length; written += (size_t)ret){
256
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
180
length - written));
262
185
return true;
263
186
}
264
187
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
277
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
289
}
290
}
291
292
free(plugin_node);
293
}
294
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
298
}
299
}
300
301
188
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
304
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
305
190
size_t d_name_len;
306
191
DIR *dir = NULL;
307
192
struct dirent *dirst;
315
200
struct sigaction old_sigchld_action;
316
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
317
202
.sa_flags = SA_NOCLDSTOP };
318
char **custom_argv = NULL;
319
int custom_argc = 0;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
320
205
321
206
/* Establish a signal handler */
322
207
sigemptyset(&sigchld_action.sa_mask);
323
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
if(ret == -1){
209
if(ret < 0){
325
210
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
327
goto fallback;
211
exit(EXIT_FAILURE);
328
212
}
329
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
if(ret == -1){
214
if(ret < 0){
331
215
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
216
exit(EXIT_FAILURE);
334
217
}
335
218
336
219
/* The options we understand. */
338
221
{ .name = "global-options", .key = 'g',
339
222
.arg = "OPTION[,OPTION[,...]]",
340
223
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
342
.arg = "VAR=value",
343
.doc = "Environment variable passed to all plugins" },
344
224
{ .name = "options-for", .key = 'o',
345
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
226
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
348
.arg = "PLUGIN:ENV=value",
349
.doc = "Environment variable passed to specified plugin" },
350
227
{ .name = "disable", .key = 'd',
351
228
.arg = "PLUGIN",
352
229
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
230
{ .name = "plugin-dir", .key = 128,
357
231
.arg = "DIRECTORY",
358
232
.doc = "Specify a different plugin directory", .group = 2 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
370
241
{ .name = NULL }
371
242
};
372
243
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
375
248
switch (key) {
376
case 'g': /* --global-options */
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
386
}
387
}
388
}
389
break;
390
case 'G': /* --global-env */
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
396
}
397
break;
398
case 'o': /* --options-for */
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
416
}
417
}
418
}
419
break;
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
{
425
char *envdef = strchr(arg, ':');
426
if(envdef == NULL){
427
break;
428
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
432
}
433
}
434
break;
435
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
442
}
443
break;
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
464
280
uid = (uid_t)strtol(arg, NULL, 10);
465
281
break;
466
case 131: /* --groupid */
282
case 130:
467
283
gid = (gid_t)strtol(arg, NULL, 10);
468
284
break;
469
case 132: /* --debug */
285
case 131:
470
286
debug = true;
471
287
break;
472
288
case ARGP_KEY_ARG:
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
306
.doc = "Mandos plugin runner -- Run plugins" };
525
307
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
309
if (ret == ARGP_ERR_UNKNOWN){
530
310
fprintf(stderr, "Unknown error while parsing arguments\n");
531
311
exitstatus = EXIT_FAILURE;
532
goto fallback;
312
goto end;
533
313
}
534
314
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
544
if(conffp != NULL){
545
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
547
size_t size = 0;
548
ssize_t sret;
549
const char whitespace_delims[] = " \r\t\f\v\n";
550
const char comment_delim[] = "#";
551
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
555
325
perror("malloc");
556
326
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
564
while(true){
565
sret = getline(&org_line, &size, conffp);
566
if(sret == -1){
567
break;
568
}
569
570
line = org_line;
571
arg = strsep(&line, comment_delim);
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
573
if(p[0] == '\0'){
574
continue;
575
}
576
new_arg = strdup(p);
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
595
}
596
}
597
free(org_line);
598
} else {
599
/* Check for harmful errors and go to fallback. Other errors might
600
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
604
goto fallback;
605
}
606
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
609
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
612
346
if (ret == ARGP_ERR_UNKNOWN){
613
347
fprintf(stderr, "Unknown error while parsing arguments\n");
614
348
exitstatus = EXIT_FAILURE;
615
goto fallback;
349
goto end;
616
350
}
617
351
}
618
352
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
628
353
if(debug){
629
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
632
357
for(char **a = p->argv; *a != NULL; a++){
633
358
fprintf(stderr, "\tArg: %s\n", *a);
634
359
}
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
636
for(char **a = p->environ; *a != NULL; a++){
637
fprintf(stderr, "\t%s\n", *a);
638
}
639
360
}
640
361
}
641
362
642
/* Strip permissions down to nobody */
643
363
ret = setuid(uid);
644
364
if (ret == -1){
645
365
perror("setuid");
646
}
366
}
367
647
368
setgid(gid);
648
369
if (ret == -1){
649
370
perror("setgid");
650
371
}
651
372
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
373
dir = opendir(plugindir);
658
374
if(dir == NULL){
659
375
perror("Could not open plugin dir");
660
376
exitstatus = EXIT_FAILURE;
661
goto fallback;
377
goto end;
662
378
}
663
379
664
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
669
385
if(ret < 0){
670
386
perror("set_cloexec_flag");
671
387
exitstatus = EXIT_FAILURE;
672
goto fallback;
388
goto end;
673
389
}
674
390
}
675
391
}
676
392
677
393
FD_ZERO(&rfds_all);
678
394
679
/* Read and execute any executable in the plugin directory*/
680
395
while(true){
681
396
dirst = readdir(dir);
682
397
683
/* All directory entries have been processed */
398
// All directory entries have been processed
684
399
if(dirst == NULL){
685
400
if (errno == EBADF){
686
401
perror("readdir");
687
402
exitstatus = EXIT_FAILURE;
688
goto fallback;
403
goto end;
689
404
}
690
405
break;
691
406
}
692
407
693
408
d_name_len = strlen(dirst->d_name);
694
409
695
/* Ignore dotfiles, backup files and other junk */
410
// Ignore dotfiles, backup files and other junk
696
411
{
697
412
bool bad_name = false;
698
413
713
428
break;
714
429
}
715
430
}
431
716
432
if(bad_name){
717
433
continue;
718
434
}
435
719
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
437
size_t suf_len = strlen(*suf);
721
438
if((d_name_len >= suf_len)
734
451
continue;
735
452
}
736
453
}
737
738
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
744
if(ret < 0){
745
perror("asprintf");
746
continue;
747
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
748
464
749
465
ret = stat(filename, &st);
750
466
if (ret == -1){
751
467
perror("stat");
752
free(filename);
753
continue;
468
exitstatus = EXIT_FAILURE;
469
goto end;
754
470
}
755
756
/* Ignore non-executable files */
471
757
472
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
473
if(debug){
759
474
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
477
free(filename);
763
478
continue;
764
479
}
765
766
plugin *p = getplugin(dirst->d_name);
767
if(p == NULL){
768
perror("getplugin");
769
free(filename);
770
continue;
771
}
772
if(p->disabled){
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
773
481
if(debug){
774
482
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
775
483
dirst->d_name);
777
485
free(filename);
778
486
continue;
779
487
}
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
780
489
{
781
490
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
783
if(g != NULL){
784
for(char **a = g->argv + 1; *a != NULL; a++){
785
if(not add_argument(p, *a)){
786
perror("add_argument");
787
}
788
}
789
/* Add global environment variables */
790
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
792
perror("add_environment");
793
}
794
}
795
}
796
}
797
/* If this plugin has any environment variables, we will call
798
using execve and need to duplicate the environment from this
799
process, too. */
800
if(p->environ[0] != NULL){
801
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
803
perror("add_environment");
804
}
805
}
806
}
807
808
int pipefd[2];
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
493
addargument(p, *a);
494
}
495
}
496
int pipefd[2];
809
497
ret = pipe(pipefd);
810
498
if (ret == -1){
811
499
perror("pipe");
812
500
exitstatus = EXIT_FAILURE;
813
goto fallback;
501
goto end;
814
502
}
815
/* Ask OS to automatic close the pipe on exec */
816
503
ret = set_cloexec_flag(pipefd[0]);
817
504
if(ret < 0){
818
505
perror("set_cloexec_flag");
819
506
exitstatus = EXIT_FAILURE;
820
goto fallback;
507
goto end;
821
508
}
822
509
ret = set_cloexec_flag(pipefd[1]);
823
510
if(ret < 0){
824
511
perror("set_cloexec_flag");
825
512
exitstatus = EXIT_FAILURE;
826
goto fallback;
513
goto end;
827
514
}
828
515
/* Block SIGCHLD until process is safely in process list */
829
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
830
517
if(ret < 0){
831
518
perror("sigprocmask");
832
519
exitstatus = EXIT_FAILURE;
833
goto fallback;
520
goto end;
834
521
}
835
/* Starting a new process to be watched */
522
// Starting a new process to be watched
836
523
pid_t pid = fork();
837
if(pid == -1){
838
perror("fork");
839
exitstatus = EXIT_FAILURE;
840
goto fallback;
841
}
842
524
if(pid == 0){
843
525
/* this is the child process */
844
526
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
863
545
above and must now close it manually here. */
864
546
closedir(dir);
865
547
}
866
if(p->environ[0] == NULL){
867
if(execv(filename, p->argv) < 0){
868
perror("execv");
869
_exit(EXIT_FAILURE);
870
}
871
} else {
872
if(execve(filename, p->argv, p->environ) < 0){
873
perror("execve");
874
_exit(EXIT_FAILURE);
875
}
548
if(execv(filename, p->argv) < 0){
549
perror("execv");
550
_exit(EXIT_FAILURE);
876
551
}
877
552
/* no return */
878
553
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
554
/* parent process */
881
555
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
559
perror("malloc");
885
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
561
if(ret < 0){
887
perror("sigprocmask");
562
perror("sigprocmask");
888
563
}
889
564
exitstatus = EXIT_FAILURE;
890
goto fallback;
565
goto end;
891
566
}
892
567
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
568
*new_process = (struct process){ .pid = pid,
569
.fd = pipefd[0],
570
.next = process_list };
571
// List handling
572
process_list = new_process;
896
573
/* Unblock SIGCHLD so signal handler can be run if this process
897
574
has already completed */
898
575
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
899
576
if(ret < 0){
900
577
perror("sigprocmask");
901
578
exitstatus = EXIT_FAILURE;
902
goto fallback;
903
}
904
905
FD_SET(new_plugin->fd, &rfds_all);
906
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
909
}
910
579
goto end;
580
}
581
582
FD_SET(new_process->fd, &rfds_all);
583
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
586
}
587
588
}
589
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
594
free(plugin_list);
911
595
}
912
596
913
597
closedir(dir);
914
598
dir = NULL;
915
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
if(p->pid != 0){
918
break;
919
}
920
if(p->next == NULL){
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
922
" directory?\n");
923
free_plugin_list();
924
}
599
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
602
" directory?\n");
603
process_list = NULL;
925
604
}
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
605
while(process_list){
929
606
fd_set rfds = rfds_all;
930
607
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
608
if (select_ret == -1){
932
609
perror("select");
933
610
exitstatus = EXIT_FAILURE;
934
goto fallback;
611
goto end;
935
612
}
936
613
/* OK, now either a process completed, or something can be read
937
614
from one of them */
938
for(plugin *proc = plugin_list; proc != NULL;){
615
for(process *proc = process_list; proc ; proc = proc->next){
939
616
/* Is this process completely done? */
940
617
if(proc->eof and proc->completed){
941
618
/* Only accept the plugin output if it exited cleanly */
942
619
if(not WIFEXITED(proc->status)
943
620
or WEXITSTATUS(proc->status) != 0){
944
621
/* Bad exit by plugin */
945
946
622
if(debug){
947
623
if(WIFEXITED(proc->status)){
948
624
fprintf(stderr, "Plugin %u exited with status %d\n",
957
633
(unsigned int) (proc->pid));
958
634
}
959
635
}
960
961
636
/* Remove the plugin */
962
637
FD_CLR(proc->fd, &rfds_all);
963
964
638
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
640
if(ret < 0){
967
641
perror("sigprocmask");
968
642
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
643
goto end;
644
}
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
649
} else {
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
652
if(p->next == proc){
653
p->next = proc->next;
654
break;
655
}
656
}
657
}
972
658
/* We are done modifying process list, so unblock signal */
973
659
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
660
NULL);
975
661
if(ret < 0){
976
662
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
983
}
984
985
plugin *next_plugin = proc->next;
986
free_plugin(proc);
987
proc = next_plugin;
988
continue;
663
}
664
free(proc->buffer);
665
free(proc);
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
668
the process list */
669
break;
989
670
}
990
991
671
/* This process exited nicely, so print its buffer */
992
672
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
674
if(not bret){
996
675
perror("print_out_password");
997
676
exitstatus = EXIT_FAILURE;
998
677
}
999
goto fallback;
678
goto end;
1000
679
}
1001
1002
680
/* This process has not completed. Does it have any output? */
1003
681
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
682
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
683
continue;
1007
684
}
1008
685
/* Before reading, make the process' data buffer large enough */
1012
689
if (proc->buffer == NULL){
1013
690
perror("malloc");
1014
691
exitstatus = EXIT_FAILURE;
1015
goto fallback;
692
goto end;
1016
693
}
1017
694
proc->buffer_size += BUFFER_SIZE;
1018
695
}
1021
698
BUFFER_SIZE);
1022
699
if(ret < 0){
1023
700
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
701
continue;
1026
702
}
1027
703
if(ret == 0){
1032
708
}
1033
709
}
1034
710
}
1035
1036
1037
fallback:
1038
711
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
712
if(process_list == NULL){
1042
713
bool bret;
1043
714
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
715
char *passwordbuffer = getpass("Password: ");
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
716
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
717
if(not bret){
1053
718
perror("print_out_password");
1054
719
exitstatus = EXIT_FAILURE;
720
goto end;
1055
721
}
1056
722
}
723
724
end:
1057
725
1058
726
/* Restore old signal handler */
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1063
}
1064
1065
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
free(*arg);
1068
}
1069
free(custom_argv);
727
sigaction(SIGCHLD, &old_sigchld_action, NULL);
728
729
free(plus_argv);
730
731
/* Free the plugin list */
732
for(plugin *next; plugin_list != NULL; plugin_list = next){
733
next = plugin_list->next;
734
free(plugin_list->argv);
735
free(plugin_list);
1070
736
}
1071
737
1072
738
if(dir != NULL){
1074
740
}
1075
741
1076
742
/* Free the process list and kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
743
for(process *next; process_list != NULL; process_list = next){
744
next = process_list->next;
745
close(process_list->fd);
746
ret = kill(process_list->pid, SIGTERM);
747
if(ret == -1 and errno != ESRCH){
748
/* set-uid proccesses migth not get closed */
749
perror("kill");
1085
750
}
751
free(process_list->buffer);
752
free(process_list);
1086
753
}
1087
754
1088
755
/* Wait for any remaining child processes to terminate */
1092
759
if(errno != ECHILD){
1093
760
perror("wait");
1094
761
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
762
1101
763
return exitstatus;
1102
764
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0