To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to mandos-client.c
- browse files at revision 24.1.46
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.46
- Committer: Björn Påhlsson
- Date: 2008-08-12 16:29:05 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 69.
- Revision ID: belorn@braxen-20080812162905-6zm7vdvj81wkumwb
mandos-client
Better error handling for failing to start plugins
Handle fork errors
password-request
correct exit routine
Better error handling for failing to start plugins
Handle fork errors
password-request
correct exit routine
- 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;
205
206
errno = 0;
320
207
321
208
/* Establish a signal handler */
322
209
sigemptyset(&sigchld_action.sa_mask);
323
210
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
if(ret == -1){
211
if(ret < 0){
325
212
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
327
goto fallback;
213
exit(EXIT_FAILURE);
328
214
}
329
215
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
if(ret == -1){
216
if(ret < 0){
331
217
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
218
exit(EXIT_FAILURE);
334
219
}
335
220
336
221
/* The options we understand. */
338
223
{ .name = "global-options", .key = 'g',
339
224
.arg = "OPTION[,OPTION[,...]]",
340
225
.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
226
{ .name = "options-for", .key = 'o',
345
227
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
228
.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
229
{ .name = "disable", .key = 'd',
351
230
.arg = "PLUGIN",
352
231
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
232
{ .name = "plugin-dir", .key = 128,
357
233
.arg = "DIRECTORY",
358
234
.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 },
235
{ .name = "userid", .key = 129,
236
.arg = "ID", .flags = 0,
237
.doc = "User ID the plugins will run as", .group = 2 },
238
{ .name = "groupid", .key = 130,
239
.arg = "ID", .flags = 0,
240
.doc = "Group ID the plugins will run as", .group = 2 },
241
{ .name = "debug", .key = 131,
242
.doc = "Debug mode", .group = 3 },
370
243
{ .name = NULL }
371
244
};
372
245
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
246
error_t parse_opt (int key, char *arg, struct argp_state *state) {
247
/* Get the INPUT argument from `argp_parse', which we know is a
248
pointer to our plugin list pointer. */
249
plugin **plugins = state->input;
375
250
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 */
251
case 'g':
252
if (arg != NULL){
253
char *p = strtok(arg, ",");
254
do{
255
addargument(getplugin(NULL, plugins), p);
256
p = strtok(NULL, ",");
257
} while (p != NULL);
258
}
259
break;
260
case 'o':
261
if (arg != NULL){
262
char *name = strtok(arg, ":");
263
char *p = strtok(NULL, ":");
264
if(p != NULL){
265
p = strtok(p, ",");
266
do{
267
addargument(getplugin(name, plugins), p);
268
p = strtok(NULL, ",");
269
} while (p != NULL);
270
}
271
}
272
break;
273
case 'd':
274
if (arg != NULL){
275
getplugin(arg, plugins)->disabled = true;
276
}
277
break;
278
case 128:
279
plugindir = arg;
280
break;
281
case 129:
464
282
uid = (uid_t)strtol(arg, NULL, 10);
465
283
break;
466
case 131: /* --groupid */
284
case 130:
467
285
gid = (gid_t)strtol(arg, NULL, 10);
468
286
break;
469
case 132: /* --debug */
287
case 131:
470
288
debug = true;
471
289
break;
472
290
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 = "",
291
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
292
argp_usage (state);
293
}
294
plus_options = arg;
295
break;
296
case ARGP_KEY_END:
297
break;
298
default:
299
return ARGP_ERR_UNKNOWN;
300
}
301
return 0;
302
}
303
304
plugin *plugin_list = NULL;
305
306
struct argp argp = { .options = options, .parser = parse_opt,
307
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
308
.doc = "Mandos plugin runner -- Run plugins" };
525
309
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);
310
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
311
if (ret == ARGP_ERR_UNKNOWN){
530
312
fprintf(stderr, "Unknown error while parsing arguments\n");
531
313
exitstatus = EXIT_FAILURE;
532
goto fallback;
314
goto end;
533
315
}
534
316
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){
317
if(plus_options){
318
/* This is a mangled argument in the form of
319
"+--option+--other-option=parameter+--yet-another-option", etc */
320
/* Make new argc and argv vars, and call argp_parse() again. */
321
plus_options++; /* skip the first '+' character */
322
const char delims[] = "+";
323
char *arg;
324
int new_argc = 1;
325
plus_argv = malloc(sizeof(char*) * 2);
326
if(plus_argv == NULL){
555
327
perror("malloc");
556
328
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);
329
goto end;
330
}
331
plus_argv[0] = argv[0];
332
plus_argv[1] = NULL;
333
arg = strtok(plus_options, delims); /* Get first argument */
334
while(arg != NULL){
335
new_argc++;
336
plus_argv = realloc(plus_argv, sizeof(char *)
337
* ((unsigned int) new_argc + 1));
338
if(plus_argv == NULL){
339
perror("realloc");
340
exitstatus = EXIT_FAILURE;
341
goto end;
342
}
343
plus_argv[new_argc-1] = arg;
344
plus_argv[new_argc] = NULL;
345
arg = strtok(NULL, delims); /* Get next argument */
346
}
347
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
612
348
if (ret == ARGP_ERR_UNKNOWN){
613
349
fprintf(stderr, "Unknown error while parsing arguments\n");
614
350
exitstatus = EXIT_FAILURE;
615
goto fallback;
351
goto end;
616
352
}
617
353
}
618
354
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
355
if(debug){
629
356
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
357
fprintf(stderr, "Plugin: %s has %d arguments\n",
632
359
for(char **a = p->argv; *a != NULL; a++){
633
360
fprintf(stderr, "\tArg: %s\n", *a);
634
361
}
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
362
}
640
363
}
641
364
642
/* Strip permissions down to nobody */
643
365
ret = setuid(uid);
644
366
if (ret == -1){
645
367
perror("setuid");
646
}
368
}
369
647
370
setgid(gid);
648
371
if (ret == -1){
649
372
perror("setgid");
650
373
}
651
374
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
375
dir = opendir(plugindir);
658
376
if(dir == NULL){
659
377
perror("Could not open plugin dir");
660
378
exitstatus = EXIT_FAILURE;
661
goto fallback;
379
goto end;
662
380
}
663
381
664
382
/* Set the FD_CLOEXEC flag on the directory, if possible */
669
387
if(ret < 0){
670
388
perror("set_cloexec_flag");
671
389
exitstatus = EXIT_FAILURE;
672
goto fallback;
390
goto end;
673
391
}
674
392
}
675
393
}
676
394
677
395
FD_ZERO(&rfds_all);
678
396
679
/* Read and execute any executable in the plugin directory*/
680
397
while(true){
681
398
dirst = readdir(dir);
682
399
683
/* All directory entries have been processed */
400
// All directory entries have been processed
684
401
if(dirst == NULL){
685
402
if (errno == EBADF){
686
403
perror("readdir");
687
404
exitstatus = EXIT_FAILURE;
688
goto fallback;
405
goto end;
689
406
}
690
407
break;
691
408
}
692
409
693
410
d_name_len = strlen(dirst->d_name);
694
411
695
/* Ignore dotfiles, backup files and other junk */
412
// Ignore dotfiles, backup files and other junk
696
413
{
697
414
bool bad_name = false;
698
415
713
430
break;
714
431
}
715
432
}
433
716
434
if(bad_name){
717
435
continue;
718
436
}
437
719
438
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
439
size_t suf_len = strlen(*suf);
721
440
if((d_name_len >= suf_len)
734
453
continue;
735
454
}
736
455
}
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");
456
457
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
458
if (filename == NULL){
459
perror("malloc");
746
460
continue;
747
461
}
462
strcpy(filename, plugindir); /* Spurious warning */
463
strcat(filename, "/"); /* Spurious warning */
464
strcat(filename, dirst->d_name); /* Spurious warning */
748
465
749
466
ret = stat(filename, &st);
750
467
if (ret == -1){
752
469
free(filename);
753
470
continue;
754
471
}
755
756
/* Ignore non-executable files */
472
757
473
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
474
if(debug){
759
475
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
478
free(filename);
763
479
continue;
764
480
}
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){
481
if(getplugin(dirst->d_name, &plugin_list)->disabled){
773
482
if(debug){
774
483
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
775
484
dirst->d_name);
777
486
free(filename);
778
487
continue;
779
488
}
489
plugin *p = getplugin(dirst->d_name, &plugin_list);
780
490
{
781
491
/* 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];
492
plugin *g = getplugin(NULL, &plugin_list);
493
for(char **a = g->argv + 1; *a != NULL; a++){
494
addargument(p, *a);
495
}
496
}
497
int pipefd[2];
809
498
ret = pipe(pipefd);
810
499
if (ret == -1){
811
500
perror("pipe");
812
501
exitstatus = EXIT_FAILURE;
813
goto fallback;
502
goto end;
814
503
}
815
/* Ask OS to automatic close the pipe on exec */
816
504
ret = set_cloexec_flag(pipefd[0]);
817
505
if(ret < 0){
818
506
perror("set_cloexec_flag");
819
507
exitstatus = EXIT_FAILURE;
820
goto fallback;
508
goto end;
821
509
}
822
510
ret = set_cloexec_flag(pipefd[1]);
823
511
if(ret < 0){
824
512
perror("set_cloexec_flag");
825
513
exitstatus = EXIT_FAILURE;
826
goto fallback;
514
goto end;
827
515
}
828
516
/* Block SIGCHLD until process is safely in process list */
829
517
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
830
518
if(ret < 0){
831
519
perror("sigprocmask");
832
520
exitstatus = EXIT_FAILURE;
833
goto fallback;
521
goto end;
834
522
}
835
/* Starting a new process to be watched */
523
// Starting a new process to be watched
836
524
pid_t pid = fork();
837
525
if(pid == -1){
838
526
perror("fork");
839
527
exitstatus = EXIT_FAILURE;
840
goto fallback;
528
goto end;
841
529
}
842
530
if(pid == 0){
843
531
/* this is the child process */
863
551
above and must now close it manually here. */
864
552
closedir(dir);
865
553
}
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
}
554
if(execv(filename, p->argv) < 0){
555
perror("execv");
556
_exit(EXIT_FAILURE);
876
557
}
877
558
/* no return */
878
559
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
560
/* parent process */
881
561
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
562
close(pipefd[1]); /* close unused write end of pipe */
563
process *new_process = malloc(sizeof(process));
564
if (new_process == NULL){
565
perror("malloc");
885
566
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
567
if(ret < 0){
887
perror("sigprocmask");
568
perror("sigprocmask");
888
569
}
889
570
exitstatus = EXIT_FAILURE;
890
goto fallback;
571
goto end;
891
572
}
892
573
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
574
*new_process = (struct process){ .pid = pid,
575
.fd = pipefd[0],
576
.next = process_list };
577
// List handling
578
process_list = new_process;
896
579
/* Unblock SIGCHLD so signal handler can be run if this process
897
580
has already completed */
898
581
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
899
582
if(ret < 0){
900
583
perror("sigprocmask");
901
584
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
585
goto end;
586
}
587
588
FD_SET(new_process->fd, &rfds_all);
589
590
if (maxfd < new_process->fd){
591
maxfd = new_process->fd;
592
}
593
594
}
595
596
/* Free the plugin list */
597
for(plugin *next; plugin_list != NULL; plugin_list = next){
598
next = plugin_list->next;
599
free(plugin_list->argv);
600
free(plugin_list);
911
601
}
912
602
913
603
closedir(dir);
914
604
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
}
605
606
if (process_list == NULL){
607
fprintf(stderr, "No plugin processes started. Incorrect plugin"
608
" directory?\n");
609
process_list = NULL;
925
610
}
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
611
while(process_list){
929
612
fd_set rfds = rfds_all;
930
613
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
614
if (select_ret == -1){
932
615
perror("select");
933
616
exitstatus = EXIT_FAILURE;
934
goto fallback;
617
goto end;
935
618
}
936
619
/* OK, now either a process completed, or something can be read
937
620
from one of them */
938
for(plugin *proc = plugin_list; proc != NULL;){
621
for(process *proc = process_list; proc ; proc = proc->next){
939
622
/* Is this process completely done? */
940
623
if(proc->eof and proc->completed){
941
624
/* Only accept the plugin output if it exited cleanly */
942
625
if(not WIFEXITED(proc->status)
943
626
or WEXITSTATUS(proc->status) != 0){
944
627
/* Bad exit by plugin */
945
946
628
if(debug){
947
629
if(WIFEXITED(proc->status)){
948
630
fprintf(stderr, "Plugin %u exited with status %d\n",
957
639
(unsigned int) (proc->pid));
958
640
}
959
641
}
960
961
642
/* Remove the plugin */
962
643
FD_CLR(proc->fd, &rfds_all);
963
964
644
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
645
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
646
if(ret < 0){
967
647
perror("sigprocmask");
968
648
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
649
goto end;
650
}
651
/* Delete this process entry from the list */
652
if(process_list == proc){
653
/* First one - simple */
654
process_list = proc->next;
655
} else {
656
/* Second one or later */
657
for(process *p = process_list; p != NULL; p = p->next){
658
if(p->next == proc){
659
p->next = proc->next;
660
break;
661
}
662
}
663
}
972
664
/* We are done modifying process list, so unblock signal */
973
665
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
666
NULL);
975
667
if(ret < 0){
976
668
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;
669
}
670
free(proc->buffer);
671
free(proc);
672
/* We deleted this process from the list, so we can't go
673
proc->next. Therefore, start over from the beginning of
674
the process list */
675
break;
989
676
}
990
991
677
/* This process exited nicely, so print its buffer */
992
678
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
679
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
680
if(not bret){
996
681
perror("print_out_password");
997
682
exitstatus = EXIT_FAILURE;
998
683
}
999
goto fallback;
684
goto end;
1000
685
}
1001
1002
686
/* This process has not completed. Does it have any output? */
1003
687
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
688
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
689
continue;
1007
690
}
1008
691
/* Before reading, make the process' data buffer large enough */
1012
695
if (proc->buffer == NULL){
1013
696
perror("malloc");
1014
697
exitstatus = EXIT_FAILURE;
1015
goto fallback;
698
goto end;
1016
699
}
1017
700
proc->buffer_size += BUFFER_SIZE;
1018
701
}
1021
704
BUFFER_SIZE);
1022
705
if(ret < 0){
1023
706
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
707
continue;
1026
708
}
1027
709
if(ret == 0){
1034
716
}
1035
717
1036
718
1037
fallback:
719
end:
1038
720
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
721
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
722
/* Fallback if all plugins failed, none are found or an error occured */
1042
723
bool bret;
1043
724
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
725
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);
726
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
727
if(not bret){
1053
728
perror("print_out_password");
1054
729
exitstatus = EXIT_FAILURE;
730
goto end;
1055
731
}
1056
732
}
1057
733
1058
734
/* 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);
735
sigaction(SIGCHLD, &old_sigchld_action, NULL);
736
737
free(plus_argv);
738
739
/* Free the plugin list */
740
for(plugin *next; plugin_list != NULL; plugin_list = next){
741
next = plugin_list->next;
742
free(plugin_list->argv);
743
free(plugin_list);
1070
744
}
1071
745
1072
746
if(dir != NULL){
1074
748
}
1075
749
1076
750
/* 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
}
751
for(process *next; process_list != NULL; process_list = next){
752
next = process_list->next;
753
close(process_list->fd);
754
ret = kill(process_list->pid, SIGTERM);
755
if(ret == -1 and errno != ESRCH){
756
/* set-uid proccesses migth not get closed */
757
perror("kill");
1085
758
}
759
free(process_list->buffer);
760
free(process_list);
1086
761
}
1087
762
1088
763
/* Wait for any remaining child processes to terminate */
1092
767
if(errno != ECHILD){
1093
768
perror("wait");
1094
769
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
770
1101
771
return exitstatus;
1102
772
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0