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- Committer: Teddy Hogeborn
- Date: 2008-09-02 06:03:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902060308-8uhgsfjiwixuvz6j
* plugin-runner.c (main/parse_opt): Removed code for "--config-file".
(main/parse_opt_config_file): New function only for "--config-file".
(main): Parse options first using "parse_opt_config_file", then from
the config file, and lastly from the command line.
(main/parse_opt_config_file): New function only for "--config-file".
(main): Parse options first using "parse_opt_config_file", then from
the config file, and lastly from the command line.
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- 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
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
52
66
53
67
#define BUFFER_SIZE 256
54
68
55
struct process;
56
57
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*/
58
86
pid_t pid;
59
87
int fd;
60
88
char *buffer;
61
89
size_t buffer_size;
62
90
size_t buffer_length;
63
91
bool eof;
64
bool completed;
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
92
volatile bool completed;
93
volatile int status;
74
94
struct plugin *next;
75
95
} plugin;
76
96
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets a 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){
79
104
if ((p->name == name)
80
105
or (p->name and name and (strcmp(p->name, name) == 0))){
81
106
return p;
84
109
/* Create a new plugin */
85
110
plugin *new_plugin = malloc(sizeof(plugin));
86
111
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
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
91
127
new_plugin->argv = malloc(sizeof(char *) * 2);
92
128
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
95
132
}
96
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
97
134
new_plugin->argv[1] = NULL;
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
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
101
145
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
103
147
return new_plugin;
104
148
}
105
149
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
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));
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));
115
204
}
116
205
117
206
/*
130
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
220
}
132
221
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* 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
139
224
status. */
140
225
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
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
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
270
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
153
305
}
154
306
155
307
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
157
311
size_t d_name_len;
158
312
DIR *dir = NULL;
159
313
struct dirent *dirst;
167
321
struct sigaction old_sigchld_action;
168
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
323
.sa_flags = SA_NOCLDSTOP };
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
324
char **custom_argv = NULL;
325
int custom_argc = 0;
172
326
173
327
/* Establish a signal handler */
174
328
sigemptyset(&sigchld_action.sa_mask);
175
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
176
if(ret < 0){
330
if(ret == -1){
177
331
perror("sigaddset");
178
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
179
334
}
180
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
181
if(ret < 0){
336
if(ret == -1){
182
337
perror("sigaction");
183
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
184
340
}
185
341
186
342
/* The options we understand. */
188
344
{ .name = "global-options", .key = 'g',
189
345
.arg = "OPTION[,OPTION[,...]]",
190
346
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
191
350
{ .name = "options-for", .key = 'o',
192
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
352
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
194
356
{ .name = "disable", .key = 'd',
195
357
.arg = "PLUGIN",
196
358
.doc = "Disable a specific plugin", .group = 1 },
197
359
{ .name = "plugin-dir", .key = 128,
198
360
.arg = "DIRECTORY",
199
361
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.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 },
208
373
{ .name = NULL }
209
374
};
210
375
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
215
378
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
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 'e': /* --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'){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0'){
415
break;
416
}
417
if(opt != NULL){
418
char *p;
419
while((p = strsep(&opt, ",")) != NULL){
420
if(p[0] == '\0'){
421
continue;
422
}
423
if(not add_argument(getplugin(p_name), p)){
424
perror("add_argument");
425
return ARGP_ERR_UNKNOWN;
426
}
427
}
428
}
429
}
430
break;
431
case 'f': /* --env-for */
432
if(arg == NULL){
433
break;
434
}
435
{
436
char *envdef = strchr(arg, ':');
437
if(envdef == NULL){
438
break;
439
}
440
char *p_name = strndup(arg, (size_t) (envdef-arg));
441
if(p_name == NULL){
442
break;
443
}
444
envdef++;
445
if(not add_environment(getplugin(p_name), envdef, true)){
446
perror("add_environment");
447
}
448
}
449
break;
450
case 'd': /* --disable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = true;
457
}
458
break;
459
case 128: /* --plugin-dir */
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
247
469
uid = (uid_t)strtol(arg, NULL, 10);
248
470
break;
249
case 130:
471
case 131: /* --groupid */
250
472
gid = (gid_t)strtol(arg, NULL, 10);
251
473
break;
252
case 131:
474
case 132: /* --debug */
253
475
debug = true;
254
476
break;
255
477
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
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 'e': /* --global-env */
496
case 'o': /* --options-for */
497
case 'f': /* --env-for */
498
case 'd': /* --disable */
499
case 128: /* --plugin-dir */
500
break;
501
case 129: /* --config-file */
502
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
258
505
}
259
plus_options = arg;
260
break;
506
break;
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
510
case ARGP_KEY_ARG:
261
511
case ARGP_KEY_END:
262
512
break;
263
513
default:
266
516
return 0;
267
517
}
268
518
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
521
.args_doc = "",
273
522
.doc = "Mandos plugin runner -- Run plugins" };
274
523
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
524
/* Parse using the parse_opt_config_file in order to get the custom
525
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
530
goto fallback;
531
}
532
533
/* Reset to the normal argument parser */
534
argp.parser = parse_opt;
535
536
/* Open the configfile if available */
537
if (argfile == NULL){
538
conffp = fopen(AFILE, "r");
539
} else {
540
conffp = fopen(argfile, "r");
541
}
542
if(conffp != NULL){
543
char *org_line = NULL;
544
char *p, *arg, *new_arg, *line;
545
size_t size = 0;
546
ssize_t sret;
547
const char whitespace_delims[] = " \r\t\f\v\n";
548
const char comment_delim[] = "#";
549
550
custom_argc = 1;
551
custom_argv = malloc(sizeof(char*) * 2);
552
if(custom_argv == NULL){
287
553
perror("malloc");
288
554
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
555
goto fallback;
556
}
557
custom_argv[0] = argv[0];
558
custom_argv[1] = NULL;
559
560
/* for each line in the config file, strip whitespace and ignore
561
commented text */
562
while(true){
563
sret = getline(&org_line, &size, conffp);
564
if(sret == -1){
565
break;
566
}
567
568
line = org_line;
569
arg = strsep(&line, comment_delim);
570
while((p = strsep(&arg, whitespace_delims)) != NULL){
571
if(p[0] == '\0'){
572
continue;
573
}
574
new_arg = strdup(p);
575
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
578
free(org_line);
579
goto fallback;
580
}
581
582
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
590
}
591
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
593
}
594
}
595
free(org_line);
596
} else {
597
/* Check for harmful errors and go to fallback. Other errors might
598
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
607
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
613
goto fallback;
614
}
615
}
616
617
/* Parse actual command line arguments, to let them override the
618
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
308
624
}
309
625
310
626
if(debug){
314
630
for(char **a = p->argv; *a != NULL; a++){
315
631
fprintf(stderr, "\tArg: %s\n", *a);
316
632
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
634
for(char **a = p->environ; *a != NULL; a++){
635
fprintf(stderr, "\t%s\n", *a);
636
}
317
637
}
318
638
}
319
639
640
/* Strip permissions down to nobody */
320
641
ret = setuid(uid);
321
642
if (ret == -1){
322
643
perror("setuid");
323
}
324
644
}
325
645
setgid(gid);
326
646
if (ret == -1){
327
647
perror("setgid");
328
648
}
329
649
330
dir = opendir(plugindir);
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
331
656
if(dir == NULL){
332
657
perror("Could not open plugin dir");
333
658
exitstatus = EXIT_FAILURE;
334
goto end;
659
goto fallback;
335
660
}
336
661
337
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
342
667
if(ret < 0){
343
668
perror("set_cloexec_flag");
344
669
exitstatus = EXIT_FAILURE;
345
goto end;
670
goto fallback;
346
671
}
347
672
}
348
673
}
349
674
350
675
FD_ZERO(&rfds_all);
351
676
677
/* Read and execute any executable in the plugin directory*/
352
678
while(true){
353
679
dirst = readdir(dir);
354
680
355
// All directory entries have been processed
681
/* All directory entries have been processed */
356
682
if(dirst == NULL){
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
686
goto fallback;
687
}
357
688
break;
358
689
}
359
690
360
691
d_name_len = strlen(dirst->d_name);
361
692
362
// Ignore dotfiles, backup files and other junk
693
/* Ignore dotfiles, backup files and other junk */
363
694
{
364
695
bool bad_name = false;
365
696
380
711
break;
381
712
}
382
713
}
383
384
714
if(bad_name){
385
715
continue;
386
716
}
387
388
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
718
size_t suf_len = strlen(*suf);
390
719
if((d_name_len >= suf_len)
403
732
continue;
404
733
}
405
734
}
406
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
735
736
char *filename;
737
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
738
if(ret < 0){
739
perror("asprintf");
740
continue;
741
}
742
743
ret = stat(filename, &st);
744
if (ret == -1){
745
perror("stat");
746
free(filename);
747
continue;
748
}
749
750
/* Ignore non-executable files */
419
751
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
420
752
if(debug){
421
753
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
424
756
free(filename);
425
757
continue;
426
758
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
759
760
plugin *p = getplugin(dirst->d_name);
761
if(p == NULL){
762
perror("getplugin");
763
free(filename);
764
continue;
765
}
766
if(p->disabled){
428
767
if(debug){
429
768
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
430
769
dirst->d_name);
432
771
free(filename);
433
772
continue;
434
773
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
436
774
{
437
775
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
776
plugin *g = getplugin(NULL);
777
if(g != NULL){
778
for(char **a = g->argv + 1; *a != NULL; a++){
779
if(not add_argument(p, *a)){
780
perror("add_argument");
781
}
782
}
783
/* Add global environment variables */
784
for(char **e = g->environ; *e != NULL; e++){
785
if(not add_environment(p, *e, false)){
786
perror("add_environment");
787
}
788
}
789
}
790
}
791
/* If this plugin has any environment variables, we will call
792
using execve and need to duplicate the environment from this
793
process, too. */
794
if(p->environ[0] != NULL){
795
for(char **e = environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
797
perror("add_environment");
798
}
799
}
800
}
801
802
int pipefd[2];
444
803
ret = pipe(pipefd);
445
804
if (ret == -1){
446
805
perror("pipe");
447
806
exitstatus = EXIT_FAILURE;
448
goto end;
807
goto fallback;
449
808
}
809
/* Ask OS to automatic close the pipe on exec */
450
810
ret = set_cloexec_flag(pipefd[0]);
451
811
if(ret < 0){
452
812
perror("set_cloexec_flag");
453
813
exitstatus = EXIT_FAILURE;
454
goto end;
814
goto fallback;
455
815
}
456
816
ret = set_cloexec_flag(pipefd[1]);
457
817
if(ret < 0){
458
818
perror("set_cloexec_flag");
459
819
exitstatus = EXIT_FAILURE;
460
goto end;
820
goto fallback;
461
821
}
462
822
/* Block SIGCHLD until process is safely in process list */
463
823
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
464
824
if(ret < 0){
465
825
perror("sigprocmask");
466
826
exitstatus = EXIT_FAILURE;
467
goto end;
827
goto fallback;
468
828
}
469
// Starting a new process to be watched
829
/* Starting a new process to be watched */
470
830
pid_t pid = fork();
831
if(pid == -1){
832
perror("fork");
833
exitstatus = EXIT_FAILURE;
834
goto fallback;
835
}
471
836
if(pid == 0){
472
837
/* this is the child process */
473
838
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
480
845
perror("sigprocmask");
481
846
_exit(EXIT_FAILURE);
482
847
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
848
849
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
850
if(ret == -1){
851
perror("dup2");
852
_exit(EXIT_FAILURE);
853
}
484
854
485
855
if(dirfd(dir) < 0){
486
856
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
857
above and must now close it manually here. */
488
858
closedir(dir);
489
859
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
860
if(p->environ[0] == NULL){
861
if(execv(filename, p->argv) < 0){
862
perror("execv");
863
_exit(EXIT_FAILURE);
864
}
865
} else {
866
if(execve(filename, p->argv, p->environ) < 0){
867
perror("execve");
868
_exit(EXIT_FAILURE);
869
}
493
870
}
494
871
/* no return */
495
872
}
496
/* parent process */
873
/* Parent process */
874
close(pipefd[1]); /* Close unused write end of pipe */
497
875
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
876
plugin *new_plugin = getplugin(dirst->d_name);
877
if (new_plugin == NULL){
878
perror("getplugin");
502
879
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
503
880
if(ret < 0){
504
perror("sigprocmask");
881
perror("sigprocmask");
505
882
}
506
883
exitstatus = EXIT_FAILURE;
507
goto end;
884
goto fallback;
508
885
}
509
886
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
887
new_plugin->pid = pid;
888
new_plugin->fd = pipefd[0];
889
515
890
/* Unblock SIGCHLD so signal handler can be run if this process
516
891
has already completed */
517
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
893
if(ret < 0){
519
894
perror("sigprocmask");
520
895
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
896
goto fallback;
897
}
898
899
FD_SET(new_plugin->fd, &rfds_all);
900
901
if (maxfd < new_plugin->fd){
902
maxfd = new_plugin->fd;
903
}
904
537
905
}
538
906
539
907
closedir(dir);
540
908
dir = NULL;
541
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
909
910
for(plugin *p = plugin_list; p != NULL; p = p->next){
911
if(p->pid != 0){
912
break;
913
}
914
if(p->next == NULL){
915
fprintf(stderr, "No plugin processes started. Incorrect plugin"
916
" directory?\n");
917
free_plugin_list();
918
}
546
919
}
547
while(process_list){
920
921
/* Main loop while running plugins exist */
922
while(plugin_list){
548
923
fd_set rfds = rfds_all;
549
924
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
925
if (select_ret == -1){
551
926
perror("select");
552
927
exitstatus = EXIT_FAILURE;
553
goto end;
928
goto fallback;
554
929
}
555
930
/* OK, now either a process completed, or something can be read
556
931
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
932
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
558
933
/* Is this process completely done? */
559
934
if(proc->eof and proc->completed){
560
935
/* Only accept the plugin output if it exited cleanly */
561
936
if(not WIFEXITED(proc->status)
562
937
or WEXITSTATUS(proc->status) != 0){
563
938
/* Bad exit by plugin */
939
564
940
if(debug){
565
941
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
942
fprintf(stderr, "Plugin %u exited with status %d\n",
943
(unsigned int) (proc->pid),
944
WEXITSTATUS(proc->status));
568
945
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
946
fprintf(stderr, "Plugin %u killed by signal %d\n",
947
(unsigned int) (proc->pid),
948
WTERMSIG(proc->status));
571
949
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
950
fprintf(stderr, "Plugin %d dumped core\n",
951
(unsigned int) (proc->pid));
573
952
}
574
953
}
954
575
955
/* Remove the plugin */
576
956
FD_CLR(proc->fd, &rfds_all);
957
577
958
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
959
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
579
960
if(ret < 0){
580
961
perror("sigprocmask");
581
962
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
963
goto fallback;
964
}
965
free_plugin(proc);
597
966
/* We are done modifying process list, so unblock signal */
598
967
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
968
NULL);
600
969
if(ret < 0){
601
970
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
if(plugin_list == NULL){
976
break;
977
}
978
continue;
609
979
}
980
610
981
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
982
983
bool bret = print_out_password(proc->buffer,
984
proc->buffer_length);
985
if(not bret){
986
perror("print_out_password");
987
exitstatus = EXIT_FAILURE;
622
988
}
623
goto end;
989
goto fallback;
624
990
}
991
625
992
/* This process has not completed. Does it have any output? */
626
993
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
994
/* This process had nothing to say at this time */
634
1001
if (proc->buffer == NULL){
635
1002
perror("malloc");
636
1003
exitstatus = EXIT_FAILURE;
637
goto end;
1004
goto fallback;
638
1005
}
639
1006
proc->buffer_size += BUFFER_SIZE;
640
1007
}
653
1020
}
654
1021
}
655
1022
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1023
1024
1025
fallback:
1026
1027
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1028
/* Fallback if all plugins failed, none are found or an error
1029
occured */
1030
bool bret;
1031
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1032
char *passwordbuffer = getpass("Password: ");
1033
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1034
if(not bret){
1035
perror("print_out_password");
1036
exitstatus = EXIT_FAILURE;
1037
}
659
1038
}
660
1039
661
end:
662
1040
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1041
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1042
if(ret == -1){
1043
perror("sigaction");
1044
exitstatus = EXIT_FAILURE;
1045
}
1046
1047
if(custom_argv != NULL){
1048
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1049
free(*arg);
1050
}
1051
free(custom_argv);
672
1052
}
673
1053
674
1054
if(dir != NULL){
676
1056
}
677
1057
678
1058
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1059
for(plugin *p = plugin_list; p != NULL; p = p->next){
1060
if(p->pid != 0){
1061
close(p->fd);
1062
ret = kill(p->pid, SIGTERM);
1063
if(ret == -1 and errno != ESRCH){
1064
/* Set-uid proccesses might not get closed */
1065
perror("kill");
1066
}
1067
}
685
1068
}
686
1069
687
1070
/* Wait for any remaining child processes to terminate */
691
1074
if(errno != ECHILD){
692
1075
perror("wait");
693
1076
}
1077
1078
free_plugin_list();
1079
1080
free(plugindir);
1081
free(argfile);
694
1082
695
1083
return exitstatus;
696
1084
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0