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- Committer: Teddy Hogeborn
- Date: 2008-09-06 15:34:21 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906153421-605ydhwyo404krh9
* initramfs-tools-hook: Use long options where available. Use only
one "test" invocation instead of several.
* mandos-keygen: Use only one "test" invocation instead of several.
Use long options where available. Strip newline from
entered password.
* plugin-runner.c (print_out_password): Do not strip trailing newline.
(fallback): Strip trailing newline from getpass().
* plugin-runner.xml (PLUGINS): Plugins should not print trailing
newlines.
* plugins.d/password-prompt.c (main): Strip trailing newline.
* plugins.d/password-request.c (main): Bug fix: Read "pubkey.txt", not
"pupkey.txt".
one "test" invocation instead of several.
* mandos-keygen: Use only one "test" invocation instead of several.
Use long options where available. Strip newline from
entered password.
* plugin-runner.c (print_out_password): Do not strip trailing newline.
(fallback): Strip trailing newline from getpass().
* plugin-runner.xml (PLUGINS): Plugins should not print trailing
newlines.
* plugins.d/password-prompt.c (main): Strip trailing newline.
* plugins.d/password-request.c (main): Bug fix: Read "pubkey.txt", not
"pupkey.txt".
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
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> /* strtok, strlen(), strcpy(),
55
strcat() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
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
struct process;
70
71
typedef struct process{
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";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
72
86
pid_t pid;
73
87
int fd;
74
88
char *buffer;
75
89
size_t buffer_size;
76
90
size_t buffer_length;
77
91
bool eof;
78
bool completed;
79
int status;
80
struct process *next;
81
} process;
82
83
typedef struct plugin{
84
char *name; /* can be NULL or any plugin name */
85
char **argv;
86
int argc;
87
bool disabled;
92
volatile bool completed;
93
volatile int status;
88
94
struct plugin *next;
89
95
} plugin;
90
96
91
static plugin *getplugin(char *name, plugin **plugin_list){
92
for (plugin *p = *plugin_list; p != NULL; p = p->next){
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){
93
104
if ((p->name == name)
94
105
or (p->name and name and (strcmp(p->name, name) == 0))){
95
106
return p;
98
109
/* Create a new plugin */
99
110
plugin *new_plugin = malloc(sizeof(plugin));
100
111
if (new_plugin == NULL){
101
perror("malloc");
102
exit(EXIT_FAILURE);
103
}
104
new_plugin->name = name;
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
105
127
new_plugin->argv = malloc(sizeof(char *) * 2);
106
128
if (new_plugin->argv == NULL){
107
perror("malloc");
108
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
109
132
}
110
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
111
134
new_plugin->argv[1] = NULL;
112
new_plugin->argc = 1;
113
new_plugin->disabled = false;
114
new_plugin->next = *plugin_list;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
115
145
/* Append the new plugin to the list */
116
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
117
147
return new_plugin;
118
148
}
119
149
120
static void addargument(plugin *p, char *arg){
121
p->argv[p->argc] = arg;
122
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
123
if (p->argv == NULL){
124
perror("malloc");
125
exit(EXIT_FAILURE);
126
}
127
p->argc++;
128
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
129
204
}
130
205
131
206
/*
144
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
145
220
}
146
221
147
const char *argp_program_version = "plugbasedclient 0.9";
148
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
222
223
/* Mark processes as completed when they exit, and save their exit
153
224
status. */
154
225
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;
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
for(size_t written = 0; written < length; written += (size_t)ret){
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
length - written));
261
if(ret < 0){
262
return false;
263
}
264
}
265
return true;
266
}
267
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
171
302
}
172
303
173
304
int main(int argc, char *argv[]){
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
175
308
size_t d_name_len;
176
309
DIR *dir = NULL;
177
310
struct dirent *dirst;
185
318
struct sigaction old_sigchld_action;
186
319
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
187
320
.sa_flags = SA_NOCLDSTOP };
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
321
char **custom_argv = NULL;
322
int custom_argc = 0;
190
323
191
324
/* Establish a signal handler */
192
325
sigemptyset(&sigchld_action.sa_mask);
193
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
194
if(ret < 0){
327
if(ret == -1){
195
328
perror("sigaddset");
196
exit(EXIT_FAILURE);
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
197
331
}
198
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
199
if(ret < 0){
333
if(ret == -1){
200
334
perror("sigaction");
201
exit(EXIT_FAILURE);
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
202
337
}
203
338
204
339
/* The options we understand. */
206
341
{ .name = "global-options", .key = 'g',
207
342
.arg = "OPTION[,OPTION[,...]]",
208
343
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
345
.arg = "VAR=value",
346
.doc = "Environment variable passed to all plugins" },
209
347
{ .name = "options-for", .key = 'o',
210
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
211
349
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
212
353
{ .name = "disable", .key = 'd',
213
354
.arg = "PLUGIN",
214
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
215
359
{ .name = "plugin-dir", .key = 128,
216
360
.arg = "DIRECTORY",
217
361
.doc = "Specify a different plugin directory", .group = 2 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
226
373
{ .name = NULL }
227
374
};
228
375
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
233
378
switch (key) {
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
379
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
390
}
391
}
392
break;
393
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
425
}
426
}
427
}
428
break;
429
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
{
434
char *envdef = strchr(arg, ':');
435
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
442
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
445
}
446
}
447
break;
448
case 'd': /* --disable */
449
if (arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = true;
455
}
456
break;
457
case 'e': /* --enable */
458
if (arg != NULL){
459
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
462
}
463
p->disabled = false;
464
}
465
break;
466
case 128: /* --plugin-dir */
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
break;
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
474
break;
475
case 130: /* --userid */
265
476
uid = (uid_t)strtol(arg, NULL, 10);
266
477
break;
267
case 130:
478
case 131: /* --groupid */
268
479
gid = (gid_t)strtol(arg, NULL, 10);
269
480
break;
270
case 131:
481
case 132: /* --debug */
271
482
debug = true;
272
483
break;
273
484
case ARGP_KEY_ARG:
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
489
default:
490
return ARGP_ERR_UNKNOWN;
491
}
492
return 0;
493
}
494
495
/* This option parser is the same as parse_opt() above, except it
496
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
501
case 'g': /* --global-options */
502
case 'G': /* --global-env */
503
case 'o': /* --options-for */
504
case 'E': /* --env-for */
505
case 'd': /* --disable */
506
case 'e': /* --enable */
507
case 128: /* --plugin-dir */
508
break;
509
case 129: /* --config-file */
510
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
276
513
}
277
plus_options = arg;
278
break;
514
break;
515
case 130: /* --userid */
516
case 131: /* --groupid */
517
case 132: /* --debug */
518
case ARGP_KEY_ARG:
279
519
case ARGP_KEY_END:
280
520
break;
281
521
default:
284
524
return 0;
285
525
}
286
526
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
529
.args_doc = "",
291
530
.doc = "Mandos plugin runner -- Run plugins" };
292
531
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
532
/* Parse using the parse_opt_config_file in order to get the custom
533
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
294
535
if (ret == ARGP_ERR_UNKNOWN){
295
fprintf(stderr, "Unkown error while parsing arguments\n");
536
fprintf(stderr, "Unknown error while parsing arguments\n");
296
537
exitstatus = EXIT_FAILURE;
297
goto end;
538
goto fallback;
298
539
}
299
540
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
543
544
/* Open the configfile if available */
545
if (argfile == NULL){
546
conffp = fopen(AFILE, "r");
547
} else {
548
conffp = fopen(argfile, "r");
549
}
550
if(conffp != NULL){
551
char *org_line = NULL;
552
char *p, *arg, *new_arg, *line;
553
size_t size = 0;
554
ssize_t sret;
555
const char whitespace_delims[] = " \r\t\f\v\n";
556
const char comment_delim[] = "#";
557
558
custom_argc = 1;
559
custom_argv = malloc(sizeof(char*) * 2);
560
if(custom_argv == NULL){
310
561
perror("malloc");
311
562
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
563
goto fallback;
564
}
565
custom_argv[0] = argv[0];
566
custom_argv[1] = NULL;
567
568
/* for each line in the config file, strip whitespace and ignore
569
commented text */
570
while(true){
571
sret = getline(&org_line, &size, conffp);
572
if(sret == -1){
573
break;
574
}
575
576
line = org_line;
577
arg = strsep(&line, comment_delim);
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
579
if(p[0] == '\0'){
580
continue;
581
}
582
new_arg = strdup(p);
583
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
586
free(org_line);
587
goto fallback;
588
}
589
590
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
598
}
599
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
601
}
602
}
603
free(org_line);
604
} else {
605
/* Check for harmful errors and go to fallback. Other errors might
606
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
610
goto fallback;
611
}
612
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
615
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
331
618
if (ret == ARGP_ERR_UNKNOWN){
332
fprintf(stderr, "Unkown error while parsing arguments\n");
619
fprintf(stderr, "Unknown error while parsing arguments\n");
333
620
exitstatus = EXIT_FAILURE;
334
goto end;
621
goto fallback;
335
622
}
336
623
}
337
624
625
/* Parse actual command line arguments, to let them override the
626
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
632
}
633
338
634
if(debug){
339
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
340
636
fprintf(stderr, "Plugin: %s has %d arguments\n",
342
638
for(char **a = p->argv; *a != NULL; a++){
343
639
fprintf(stderr, "\tArg: %s\n", *a);
344
640
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
642
for(char **a = p->environ; *a != NULL; a++){
643
fprintf(stderr, "\t%s\n", *a);
644
}
345
645
}
346
646
}
347
647
648
/* Strip permissions down to nobody */
348
649
ret = setuid(uid);
349
650
if (ret == -1){
350
651
perror("setuid");
351
}
352
652
}
353
653
setgid(gid);
354
654
if (ret == -1){
355
655
perror("setgid");
356
656
}
357
657
358
dir = opendir(plugindir);
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
359
664
if(dir == NULL){
360
665
perror("Could not open plugin dir");
361
666
exitstatus = EXIT_FAILURE;
362
goto end;
667
goto fallback;
363
668
}
364
669
365
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
370
675
if(ret < 0){
371
676
perror("set_cloexec_flag");
372
677
exitstatus = EXIT_FAILURE;
373
goto end;
678
goto fallback;
374
679
}
375
680
}
376
681
}
377
682
378
683
FD_ZERO(&rfds_all);
379
684
685
/* Read and execute any executable in the plugin directory*/
380
686
while(true){
381
687
dirst = readdir(dir);
382
688
383
// All directory entries have been processed
689
/* All directory entries have been processed */
384
690
if(dirst == NULL){
385
691
if (errno == EBADF){
386
692
perror("readdir");
387
693
exitstatus = EXIT_FAILURE;
388
goto end;
694
goto fallback;
389
695
}
390
696
break;
391
697
}
392
698
393
699
d_name_len = strlen(dirst->d_name);
394
700
395
// Ignore dotfiles, backup files and other junk
701
/* Ignore dotfiles, backup files and other junk */
396
702
{
397
703
bool bad_name = false;
398
704
413
719
break;
414
720
}
415
721
}
416
417
722
if(bad_name){
418
723
continue;
419
724
}
420
421
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
422
726
size_t suf_len = strlen(*suf);
423
727
if((d_name_len >= suf_len)
436
740
continue;
437
741
}
438
742
}
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
743
744
char *filename;
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
if(ret < 0){
747
perror("asprintf");
748
continue;
445
749
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
449
750
450
751
ret = stat(filename, &st);
451
752
if (ret == -1){
452
753
perror("stat");
453
exitstatus = EXIT_FAILURE;
454
goto end;
754
free(filename);
755
continue;
455
756
}
456
757
758
/* Ignore non-executable files */
457
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
458
760
if(debug){
459
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
462
764
free(filename);
463
765
continue;
464
766
}
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
767
768
plugin *p = getplugin(dirst->d_name);
769
if(p == NULL){
770
perror("getplugin");
771
free(filename);
772
continue;
773
}
774
if(p->disabled){
466
775
if(debug){
467
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
468
777
dirst->d_name);
470
779
free(filename);
471
780
continue;
472
781
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
474
782
{
475
783
/* Add global arguments to argument list for this plugin */
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
784
plugin *g = getplugin(NULL);
785
if(g != NULL){
786
for(char **a = g->argv + 1; *a != NULL; a++){
787
if(not add_argument(p, *a)){
788
perror("add_argument");
789
}
790
}
791
/* Add global environment variables */
792
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
794
perror("add_environment");
795
}
796
}
797
}
798
}
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
802
if(p->environ[0] != NULL){
803
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
805
perror("add_environment");
806
}
807
}
808
}
809
810
int pipefd[2];
482
811
ret = pipe(pipefd);
483
812
if (ret == -1){
484
813
perror("pipe");
485
814
exitstatus = EXIT_FAILURE;
486
goto end;
815
goto fallback;
487
816
}
817
/* Ask OS to automatic close the pipe on exec */
488
818
ret = set_cloexec_flag(pipefd[0]);
489
819
if(ret < 0){
490
820
perror("set_cloexec_flag");
491
821
exitstatus = EXIT_FAILURE;
492
goto end;
822
goto fallback;
493
823
}
494
824
ret = set_cloexec_flag(pipefd[1]);
495
825
if(ret < 0){
496
826
perror("set_cloexec_flag");
497
827
exitstatus = EXIT_FAILURE;
498
goto end;
828
goto fallback;
499
829
}
500
830
/* Block SIGCHLD until process is safely in process list */
501
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
502
832
if(ret < 0){
503
833
perror("sigprocmask");
504
834
exitstatus = EXIT_FAILURE;
505
goto end;
835
goto fallback;
506
836
}
507
// Starting a new process to be watched
837
/* Starting a new process to be watched */
508
838
pid_t pid = fork();
839
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
842
goto fallback;
843
}
509
844
if(pid == 0){
510
845
/* this is the child process */
511
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
530
865
above and must now close it manually here. */
531
866
closedir(dir);
532
867
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
536
878
}
537
879
/* no return */
538
880
}
539
/* parent process */
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
540
883
free(filename);
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
545
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
546
888
if(ret < 0){
547
perror("sigprocmask");
889
perror("sigprocmask");
548
890
}
549
891
exitstatus = EXIT_FAILURE;
550
goto end;
892
goto fallback;
551
893
}
552
894
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
558
898
/* Unblock SIGCHLD so signal handler can be run if this process
559
899
has already completed */
560
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
561
901
if(ret < 0){
562
902
perror("sigprocmask");
563
903
exitstatus = EXIT_FAILURE;
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
904
goto fallback;
905
}
906
907
FD_SET(new_plugin->fd, &rfds_all);
908
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
911
}
912
580
913
}
581
914
582
915
closedir(dir);
583
916
dir = NULL;
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
917
918
for(plugin *p = plugin_list; p != NULL; p = p->next){
919
if(p->pid != 0){
920
break;
921
}
922
if(p->next == NULL){
923
fprintf(stderr, "No plugin processes started. Incorrect plugin"
924
" directory?\n");
925
free_plugin_list();
926
}
589
927
}
590
while(process_list){
928
929
/* Main loop while running plugins exist */
930
while(plugin_list){
591
931
fd_set rfds = rfds_all;
592
932
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
593
933
if (select_ret == -1){
594
934
perror("select");
595
935
exitstatus = EXIT_FAILURE;
596
goto end;
936
goto fallback;
597
937
}
598
938
/* OK, now either a process completed, or something can be read
599
939
from one of them */
600
for(process *proc = process_list; proc ; proc = proc->next){
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
601
941
/* Is this process completely done? */
602
942
if(proc->eof and proc->completed){
603
943
/* Only accept the plugin output if it exited cleanly */
604
944
if(not WIFEXITED(proc->status)
605
945
or WEXITSTATUS(proc->status) != 0){
606
946
/* Bad exit by plugin */
947
607
948
if(debug){
608
949
if(WIFEXITED(proc->status)){
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
950
fprintf(stderr, "Plugin %u exited with status %d\n",
951
(unsigned int) (proc->pid),
952
WEXITSTATUS(proc->status));
611
953
} else if(WIFSIGNALED(proc->status)) {
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
954
fprintf(stderr, "Plugin %u killed by signal %d\n",
955
(unsigned int) (proc->pid),
956
WTERMSIG(proc->status));
614
957
} else if(WCOREDUMP(proc->status)){
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
958
fprintf(stderr, "Plugin %d dumped core\n",
959
(unsigned int) (proc->pid));
616
960
}
617
961
}
962
618
963
/* Remove the plugin */
619
964
FD_CLR(proc->fd, &rfds_all);
965
620
966
/* Block signal while modifying process_list */
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
622
968
if(ret < 0){
623
969
perror("sigprocmask");
624
970
exitstatus = EXIT_FAILURE;
625
goto end;
626
}
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
631
} else {
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
634
if(p->next == proc){
635
p->next = proc->next;
636
break;
637
}
638
}
639
}
971
goto fallback;
972
}
973
free_plugin(proc);
640
974
/* We are done modifying process list, so unblock signal */
641
975
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
642
976
NULL);
643
977
if(ret < 0){
644
978
perror("sigprocmask");
645
}
646
free(proc->buffer);
647
free(proc);
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
650
the process list */
651
break;
979
exitstatus = EXIT_FAILURE;
980
goto fallback;
981
}
982
983
if(plugin_list == NULL){
984
break;
985
}
986
continue;
652
987
}
988
653
989
/* This process exited nicely, so print its buffer */
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
658
proc->buffer_length
659
- written));
660
if(ret < 0){
661
perror("write");
662
exitstatus = EXIT_FAILURE;
663
goto end;
664
}
990
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
993
if(not bret){
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;
665
996
}
666
goto end;
997
goto fallback;
667
998
}
999
668
1000
/* This process has not completed. Does it have any output? */
669
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
670
1002
/* This process had nothing to say at this time */
677
1009
if (proc->buffer == NULL){
678
1010
perror("malloc");
679
1011
exitstatus = EXIT_FAILURE;
680
goto end;
1012
goto fallback;
681
1013
}
682
1014
proc->buffer_size += BUFFER_SIZE;
683
1015
}
696
1028
}
697
1029
}
698
1030
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
1031
1032
1033
fallback:
1034
1035
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1036
/* Fallback if all plugins failed, none are found or an error
1037
occured */
1038
bool bret;
1039
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1040
char *passwordbuffer = getpass("Password: ");
1041
size_t len = strlen(passwordbuffer);
1042
/* Strip trailing newline */
1043
if(len > 0 and passwordbuffer[len-1] == '\n'){
1044
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1045
len--;
1046
}
1047
bret = print_out_password(passwordbuffer, len);
1048
if(not bret){
1049
perror("print_out_password");
1050
exitstatus = EXIT_FAILURE;
1051
}
702
1052
}
703
1053
704
end:
705
1054
/* Restore old signal handler */
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
707
708
free(plus_argv);
709
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
714
free(plugin_list);
1055
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1056
if(ret == -1){
1057
perror("sigaction");
1058
exitstatus = EXIT_FAILURE;
1059
}
1060
1061
if(custom_argv != NULL){
1062
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1063
free(*arg);
1064
}
1065
free(custom_argv);
715
1066
}
716
1067
717
1068
if(dir != NULL){
719
1070
}
720
1071
721
1072
/* Free the process list and kill the processes */
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
728
perror("kill");
1073
for(plugin *p = plugin_list; p != NULL; p = p->next){
1074
if(p->pid != 0){
1075
close(p->fd);
1076
ret = kill(p->pid, SIGTERM);
1077
if(ret == -1 and errno != ESRCH){
1078
/* Set-uid proccesses might not get closed */
1079
perror("kill");
1080
}
729
1081
}
730
free(process_list->buffer);
731
free(process_list);
732
1082
}
733
1083
734
1084
/* Wait for any remaining child processes to terminate */
738
1088
if(errno != ECHILD){
739
1089
perror("wait");
740
1090
}
1091
1092
free_plugin_list();
1093
1094
free(plugindir);
1095
free(argfile);
741
1096
742
1097
return exitstatus;
743
1098
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0