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- Committer: Björn Påhlsson
- Date: 2008-08-10 20:22:27 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 63.
- Revision ID: belorn@braxen-20080810202227-nz1a4g8pxfm6051l
Added fallback to mandos-client
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- 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
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
53
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#define BUFFER_SIZE 256
70
68
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
69
const char *argp_program_version = "mandos-client 1.0";
75
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
71
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;
72
struct process;
84
73
85
/* Variables used for running processes*/
74
typedef struct process{
86
75
pid_t pid;
87
76
int fd;
88
77
char *buffer;
89
78
size_t buffer_size;
90
79
size_t buffer_length;
91
80
bool eof;
92
volatile sig_atomic_t completed;
81
bool completed;
93
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;
94
91
struct plugin *next;
95
92
} plugin;
96
93
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
106
98
return p;
107
99
}
108
100
}
109
101
/* Create a new plugin */
110
102
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
free(new_plugin);
119
return NULL;
120
}
121
}
122
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
127
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
128
108
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
131
free(new_plugin);
132
return NULL;
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
133
112
}
134
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
135
114
new_plugin->argv[1] = NULL;
136
137
new_plugin->environ = malloc(sizeof(char *));
138
if(new_plugin->environ == NULL){
139
free(copy_name);
140
free(new_plugin->argv);
141
free(new_plugin);
142
return NULL;
143
}
144
new_plugin->environ[0] = NULL;
145
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
146
118
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
148
120
return new_plugin;
149
121
}
150
122
151
/* Helper function for add_argument and add_environment */
152
static bool add_to_char_array(const char *new, char ***array,
153
int *len){
154
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
157
/* Malloc check */
158
if(*array == NULL){
159
return false;
160
}
161
/* Make a copy of the new string */
162
char *copy = strdup(new);
163
if(copy == NULL){
164
return false;
165
}
166
/* Insert the copy */
167
(*array)[*len] = copy;
168
(*len)++;
169
/* Add a new terminating NULL pointer to the last element */
170
(*array)[*len] = NULL;
171
return true;
172
}
173
174
/* Add to a plugin's argument vector */
175
static bool add_argument(plugin *p, const char *arg){
176
if(p == NULL){
177
return false;
178
}
179
return add_to_char_array(arg, &(p->argv), &(p->argc));
180
}
181
182
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
184
if(p == NULL){
185
return false;
186
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
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;
205
132
}
206
133
207
134
/*
209
136
* Descriptor Flags".
210
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
138
*/
212
static int set_cloexec_flag(int fd){
139
static int set_cloexec_flag(int fd)
140
{
213
141
int ret = fcntl(fd, F_GETFD, 0);
214
142
/* If reading the flags failed, return error indication now. */
215
143
if(ret < 0){
219
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
148
}
221
149
150
process *process_list = NULL;
222
151
223
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
224
153
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
227
while(true){
228
plugin *proc = plugin_list;
229
int status;
230
pid_t pid = waitpid(-1, &status, WNOHANG);
231
if(pid == 0){
232
/* Only still running child processes */
233
break;
234
}
235
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
239
}
240
perror("waitpid");
241
}
242
243
/* A child exited, find it in process_list */
244
while(proc != NULL and proc->pid != pid){
245
proc = proc->next;
246
}
247
if(proc == NULL){
248
/* Process not found in process list */
249
continue;
250
}
251
proc->status = status;
252
proc->completed = 1;
253
}
254
errno = old_errno;
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;
255
171
}
256
172
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
259
ssize_t ret;
260
for(size_t written = 0; written < length; written += (size_t)ret){
173
bool print_out_password(const char *buffer, size_t length){
174
size_t ret;
175
for(size_t written = 0; written < length; written += ret){
261
176
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
177
length - written));
263
178
if(ret < 0){
267
182
return true;
268
183
}
269
184
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
294
}
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
303
}
304
}
305
306
185
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
309
FILE *conffp;
186
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
310
187
size_t d_name_len;
311
188
DIR *dir = NULL;
312
189
struct dirent *dirst;
313
190
struct stat st;
314
191
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
192
int ret, maxfd = 0;
318
193
uid_t uid = 65534;
319
194
gid_t gid = 65534;
320
195
bool debug = false;
322
197
struct sigaction old_sigchld_action;
323
198
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
324
199
.sa_flags = SA_NOCLDSTOP };
325
char **custom_argv = NULL;
326
int custom_argc = 0;
200
char *plus_options = NULL;
201
char **plus_argv = NULL;
327
202
328
203
/* Establish a signal handler */
329
204
sigemptyset(&sigchld_action.sa_mask);
330
205
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
if(ret == -1){
206
if(ret < 0){
332
207
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
334
goto fallback;
208
exit(EXIT_FAILURE);
335
209
}
336
210
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
if(ret == -1){
211
if(ret < 0){
338
212
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
340
goto fallback;
213
exit(EXIT_FAILURE);
341
214
}
342
215
343
216
/* The options we understand. */
345
218
{ .name = "global-options", .key = 'g',
346
219
.arg = "OPTION[,OPTION[,...]]",
347
220
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
349
.arg = "VAR=value",
350
.doc = "Environment variable passed to all plugins" },
351
221
{ .name = "options-for", .key = 'o',
352
222
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
223
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
355
.arg = "PLUGIN:ENV=value",
356
.doc = "Environment variable passed to specified plugin" },
357
224
{ .name = "disable", .key = 'd',
358
225
.arg = "PLUGIN",
359
226
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
227
{ .name = "plugin-dir", .key = 128,
364
228
.arg = "DIRECTORY",
365
229
.doc = "Specify a different plugin directory", .group = 2 },
366
{ .name = "config-file", .key = 129,
367
.arg = "FILE",
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
230
{ .name = "userid", .key = 129,
231
.arg = "ID", .flags = 0,
232
.doc = "User ID the plugins will run as", .group = 2 },
233
{ .name = "groupid", .key = 130,
234
.arg = "ID", .flags = 0,
235
.doc = "Group ID the plugins will run as", .group = 2 },
236
{ .name = "debug", .key = 131,
237
.doc = "Debug mode", .group = 3 },
377
238
{ .name = NULL }
378
239
};
379
240
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
393
}
394
}
395
}
396
break;
397
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
403
}
404
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
423
}
424
}
425
}
426
break;
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
{
432
char *envdef = strchr(arg, ':');
433
if(envdef == NULL){
434
break;
435
}
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
439
}
440
}
441
break;
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
447
}
448
p->disabled = true;
449
}
450
break;
451
case 'e': /* --enable */
452
if(arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = false;
458
}
459
break;
460
case 128: /* --plugin-dir */
461
free(plugindir);
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
469
break;
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
478
}
479
break;
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
488
}
489
break;
490
case 132: /* --debug */
241
error_t parse_opt (int key, char *arg, struct argp_state *state) {
242
/* Get the INPUT argument from `argp_parse', which we know is a
243
pointer to our plugin list pointer. */
244
plugin **plugins = state->input;
245
switch (key) {
246
case 'g':
247
if (arg != NULL){
248
char *p = strtok(arg, ",");
249
do{
250
addargument(getplugin(NULL, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
break;
255
case 'o':
256
if (arg != NULL){
257
char *name = strtok(arg, ":");
258
char *p = strtok(NULL, ":");
259
if(p != NULL){
260
p = strtok(p, ",");
261
do{
262
addargument(getplugin(name, plugins), p);
263
p = strtok(NULL, ",");
264
} while (p != NULL);
265
}
266
}
267
break;
268
case 'd':
269
if (arg != NULL){
270
getplugin(arg, plugins)->disabled = true;
271
}
272
break;
273
case 128:
274
plugindir = arg;
275
break;
276
case 129:
277
uid = (uid_t)strtol(arg, NULL, 10);
278
break;
279
case 130:
280
gid = (gid_t)strtol(arg, NULL, 10);
281
break;
282
case 131:
491
283
debug = true;
492
284
break;
493
/*
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
496
*/
497
case ARGP_KEY_ARG:
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
default:
508
return ARGP_ERR_UNKNOWN;
509
}
510
return 0;
511
}
512
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
518
switch(key){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
526
break;
527
case 129: /* --config-file */
528
free(argfile);
529
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
break;
540
default:
541
return ARGP_ERR_UNKNOWN;
542
}
543
return 0;
544
}
545
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
548
.args_doc = "",
285
case ARGP_KEY_ARG:
286
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
287
argp_usage (state);
288
}
289
plus_options = arg;
290
break;
291
case ARGP_KEY_END:
292
break;
293
default:
294
return ARGP_ERR_UNKNOWN;
295
}
296
return 0;
297
}
298
299
plugin *plugin_list = NULL;
300
301
struct argp argp = { .options = options, .parser = parse_opt,
302
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
549
303
.doc = "Mandos plugin runner -- Run plugins" };
550
304
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
305
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
306
if (ret == ARGP_ERR_UNKNOWN){
307
fprintf(stderr, "Unkown error while parsing arguments\n");
556
308
exitstatus = EXIT_FAILURE;
557
goto fallback;
309
goto end;
558
310
}
559
311
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
562
563
/* Open the configfile if available */
564
if(argfile == NULL){
565
conffp = fopen(AFILE, "r");
566
} else {
567
conffp = fopen(argfile, "r");
568
}
569
if(conffp != NULL){
570
char *org_line = NULL;
571
char *p, *arg, *new_arg, *line;
572
size_t size = 0;
573
const char whitespace_delims[] = " \r\t\f\v\n";
574
const char comment_delim[] = "#";
575
576
custom_argc = 1;
577
custom_argv = malloc(sizeof(char*) * 2);
578
if(custom_argv == NULL){
312
if(plus_options){
313
/* This is a mangled argument in the form of
314
"+--option+--other-option=parameter+--yet-another-option", etc */
315
/* Make new argc and argv vars, and call argp_parse() again. */
316
plus_options++; /* skip the first '+' character */
317
const char delims[] = "+";
318
char *arg;
319
int new_argc = 1;
320
plus_argv = malloc(sizeof(char*) * 2);
321
if(plus_argv == NULL){
579
322
perror("malloc");
580
323
exitstatus = EXIT_FAILURE;
581
goto fallback;
582
}
583
custom_argv[0] = argv[0];
584
custom_argv[1] = NULL;
585
586
/* for each line in the config file, strip whitespace and ignore
587
commented text */
588
while(true){
589
sret = getline(&org_line, &size, conffp);
590
if(sret == -1){
591
break;
592
}
593
594
line = org_line;
595
arg = strsep(&line, comment_delim);
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
if(p[0] == '\0'){
598
continue;
599
}
600
new_arg = strdup(p);
601
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
604
free(org_line);
605
goto fallback;
606
}
607
608
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
616
}
617
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
619
}
620
}
621
free(org_line);
622
} else {
623
/* Check for harmful errors and go to fallback. Other errors might
624
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
629
}
630
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
633
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
639
goto fallback;
640
}
641
}
642
643
/* Parse actual command line arguments, to let them override the
644
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
324
goto end;
325
}
326
plus_argv[0] = argv[0];
327
plus_argv[1] = NULL;
328
arg = strtok(plus_options, delims); /* Get first argument */
329
while(arg != NULL){
330
new_argc++;
331
plus_argv = realloc(plus_argv, sizeof(char *)
332
* ((unsigned int) new_argc + 1));
333
if(plus_argv == NULL){
334
perror("realloc");
335
exitstatus = EXIT_FAILURE;
336
goto end;
337
}
338
plus_argv[new_argc-1] = arg;
339
plus_argv[new_argc] = NULL;
340
arg = strtok(NULL, delims); /* Get next argument */
341
}
342
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
343
if (ret == ARGP_ERR_UNKNOWN){
344
fprintf(stderr, "Unkown error while parsing arguments\n");
345
exitstatus = EXIT_FAILURE;
346
goto end;
347
}
650
348
}
651
349
652
350
if(debug){
656
354
for(char **a = p->argv; *a != NULL; a++){
657
355
fprintf(stderr, "\tArg: %s\n", *a);
658
356
}
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
660
for(char **a = p->environ; *a != NULL; a++){
661
fprintf(stderr, "\t%s\n", *a);
662
}
663
357
}
664
358
}
665
359
666
/* Strip permissions down to nobody */
360
ret = setuid(uid);
361
if (ret == -1){
362
perror("setuid");
363
}
364
667
365
setgid(gid);
668
if(ret == -1){
366
if (ret == -1){
669
367
perror("setgid");
670
368
}
671
ret = setuid(uid);
672
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
369
370
dir = opendir(plugindir);
682
371
if(dir == NULL){
683
372
perror("Could not open plugin dir");
684
373
exitstatus = EXIT_FAILURE;
685
goto fallback;
374
goto end;
686
375
}
687
376
688
377
/* Set the FD_CLOEXEC flag on the directory, if possible */
693
382
if(ret < 0){
694
383
perror("set_cloexec_flag");
695
384
exitstatus = EXIT_FAILURE;
696
goto fallback;
385
goto end;
697
386
}
698
387
}
699
388
}
700
389
701
390
FD_ZERO(&rfds_all);
702
391
703
/* Read and execute any executable in the plugin directory*/
704
392
while(true){
705
393
dirst = readdir(dir);
706
394
707
/* All directory entries have been processed */
395
// All directory entries have been processed
708
396
if(dirst == NULL){
709
if(errno == EBADF){
397
if (errno == EBADF){
710
398
perror("readdir");
711
399
exitstatus = EXIT_FAILURE;
712
goto fallback;
400
goto end;
713
401
}
714
402
break;
715
403
}
716
404
717
405
d_name_len = strlen(dirst->d_name);
718
406
719
/* Ignore dotfiles, backup files and other junk */
407
// Ignore dotfiles, backup files and other junk
720
408
{
721
409
bool bad_name = false;
722
410
724
412
725
413
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
414
".dpkg-old",
727
".dpkg-bak",
728
415
".dpkg-divert", NULL };
729
416
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
417
size_t pre_len = strlen(*pre);
738
425
break;
739
426
}
740
427
}
428
741
429
if(bad_name){
742
430
continue;
743
431
}
432
744
433
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
434
size_t suf_len = strlen(*suf);
746
435
if((d_name_len >= suf_len)
759
448
continue;
760
449
}
761
450
}
762
763
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
769
if(ret < 0){
770
perror("asprintf");
771
continue;
772
}
451
452
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
453
if (filename == NULL){
454
perror("malloc");
455
exitstatus = EXIT_FAILURE;
456
goto end;
457
}
458
strcpy(filename, plugindir); /* Spurious warning */
459
strcat(filename, "/"); /* Spurious warning */
460
strcat(filename, dirst->d_name); /* Spurious warning */
773
461
774
462
ret = stat(filename, &st);
775
if(ret == -1){
463
if (ret == -1){
776
464
perror("stat");
777
free(filename);
778
continue;
465
exitstatus = EXIT_FAILURE;
466
goto end;
779
467
}
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
468
469
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
783
470
if(debug){
784
471
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
472
" with bad type or mode\n", filename);
787
474
free(filename);
788
475
continue;
789
476
}
790
791
plugin *p = getplugin(dirst->d_name);
792
if(p == NULL){
793
perror("getplugin");
794
free(filename);
795
continue;
796
}
797
if(p->disabled){
477
if(getplugin(dirst->d_name, &plugin_list)->disabled){
798
478
if(debug){
799
479
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
800
480
dirst->d_name);
802
482
free(filename);
803
483
continue;
804
484
}
485
plugin *p = getplugin(dirst->d_name, &plugin_list);
805
486
{
806
487
/* Add global arguments to argument list for this plugin */
807
plugin *g = getplugin(NULL);
808
if(g != NULL){
809
for(char **a = g->argv + 1; *a != NULL; a++){
810
if(not add_argument(p, *a)){
811
perror("add_argument");
812
}
813
}
814
/* Add global environment variables */
815
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
817
perror("add_environment");
818
}
819
}
820
}
821
}
822
/* If this plugin has any environment variables, we will call
823
using execve and need to duplicate the environment from this
824
process, too. */
825
if(p->environ[0] != NULL){
826
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
828
perror("add_environment");
829
}
830
}
831
}
832
833
int pipefd[2];
488
plugin *g = getplugin(NULL, &plugin_list);
489
for(char **a = g->argv + 1; *a != NULL; a++){
490
addargument(p, *a);
491
}
492
}
493
int pipefd[2];
834
494
ret = pipe(pipefd);
835
if(ret == -1){
495
if (ret == -1){
836
496
perror("pipe");
837
497
exitstatus = EXIT_FAILURE;
838
goto fallback;
498
goto end;
839
499
}
840
/* Ask OS to automatic close the pipe on exec */
841
500
ret = set_cloexec_flag(pipefd[0]);
842
501
if(ret < 0){
843
502
perror("set_cloexec_flag");
844
503
exitstatus = EXIT_FAILURE;
845
goto fallback;
504
goto end;
846
505
}
847
506
ret = set_cloexec_flag(pipefd[1]);
848
507
if(ret < 0){
849
508
perror("set_cloexec_flag");
850
509
exitstatus = EXIT_FAILURE;
851
goto fallback;
510
goto end;
852
511
}
853
512
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
513
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
855
514
if(ret < 0){
856
515
perror("sigprocmask");
857
516
exitstatus = EXIT_FAILURE;
858
goto fallback;
517
goto end;
859
518
}
860
/* Starting a new process to be watched */
519
// Starting a new process to be watched
861
520
pid_t pid = fork();
862
if(pid == -1){
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
865
goto fallback;
866
}
867
521
if(pid == 0){
868
522
/* this is the child process */
869
523
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
871
525
perror("sigaction");
872
526
_exit(EXIT_FAILURE);
873
527
}
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
528
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
529
if(ret < 0){
876
530
perror("sigprocmask");
877
531
_exit(EXIT_FAILURE);
878
532
}
879
533
880
534
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
535
if(ret == -1){
882
536
perror("dup2");
888
542
above and must now close it manually here. */
889
543
closedir(dir);
890
544
}
891
if(p->environ[0] == NULL){
892
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
895
}
896
} else {
897
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
900
}
545
if(execv(filename, p->argv) < 0){
546
perror("execv");
547
_exit(EXIT_FAILURE);
901
548
}
902
549
/* no return */
903
550
}
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
551
/* parent process */
906
552
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
553
close(pipefd[1]); /* close unused write end of pipe */
554
process *new_process = malloc(sizeof(process));
555
if (new_process == NULL){
556
perror("malloc");
557
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
558
if(ret < 0){
912
perror("sigprocmask");
559
perror("sigprocmask");
913
560
}
914
561
exitstatus = EXIT_FAILURE;
915
goto fallback;
562
goto end;
916
563
}
917
564
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
565
*new_process = (struct process){ .pid = pid,
566
.fd = pipefd[0],
567
.next = process_list };
568
// List handling
569
process_list = new_process;
921
570
/* Unblock SIGCHLD so signal handler can be run if this process
922
571
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
572
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
924
573
if(ret < 0){
925
574
perror("sigprocmask");
926
575
exitstatus = EXIT_FAILURE;
927
goto fallback;
928
}
929
930
FD_SET(new_plugin->fd, &rfds_all);
931
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
934
}
576
goto end;
577
}
578
579
FD_SET(new_process->fd, &rfds_all);
580
581
if (maxfd < new_process->fd){
582
maxfd = new_process->fd;
583
}
584
585
}
586
587
/* Free the plugin list */
588
for(plugin *next; plugin_list != NULL; plugin_list = next){
589
next = plugin_list->next;
590
free(plugin_list->argv);
591
free(plugin_list);
935
592
}
936
593
937
594
closedir(dir);
938
595
dir = NULL;
939
free_plugin(getplugin(NULL));
940
941
for(plugin *p = plugin_list; p != NULL; p = p->next){
942
if(p->pid != 0){
943
break;
944
}
945
if(p->next == NULL){
946
fprintf(stderr, "No plugin processes started. Incorrect plugin"
947
" directory?\n");
948
free_plugin_list();
949
}
596
597
if (process_list == NULL){
598
fprintf(stderr, "No plugin processes started. Incorrect plugin"
599
" directory?\n");
600
process_list = NULL;
950
601
}
951
952
/* Main loop while running plugins exist */
953
while(plugin_list){
602
while(process_list){
954
603
fd_set rfds = rfds_all;
955
604
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
956
if(select_ret == -1){
605
if (select_ret == -1){
957
606
perror("select");
958
607
exitstatus = EXIT_FAILURE;
959
goto fallback;
608
goto end;
960
609
}
961
610
/* OK, now either a process completed, or something can be read
962
611
from one of them */
963
for(plugin *proc = plugin_list; proc != NULL;){
612
for(process *proc = process_list; proc ; proc = proc->next){
964
613
/* Is this process completely done? */
965
if(proc->completed and proc->eof){
614
if(proc->eof and proc->completed){
966
615
/* Only accept the plugin output if it exited cleanly */
967
616
if(not WIFEXITED(proc->status)
968
617
or WEXITSTATUS(proc->status) != 0){
969
618
/* Bad exit by plugin */
970
971
619
if(debug){
972
620
if(WIFEXITED(proc->status)){
973
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
974
" status %d\n", proc->name,
975
(intmax_t) (proc->pid),
621
fprintf(stderr, "Plugin %u exited with status %d\n",
622
(unsigned int) (proc->pid),
976
623
WEXITSTATUS(proc->status));
977
} else if(WIFSIGNALED(proc->status)){
978
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
979
" signal %d\n", proc->name,
980
(intmax_t) (proc->pid),
624
} else if(WIFSIGNALED(proc->status)) {
625
fprintf(stderr, "Plugin %u killed by signal %d\n",
626
(unsigned int) (proc->pid),
981
627
WTERMSIG(proc->status));
982
628
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
629
fprintf(stderr, "Plugin %d dumped core\n",
630
(unsigned int) (proc->pid));
985
631
}
986
632
}
987
988
633
/* Remove the plugin */
989
634
FD_CLR(proc->fd, &rfds_all);
990
991
635
/* Block signal while modifying process_list */
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
636
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
637
if(ret < 0){
994
638
perror("sigprocmask");
995
639
exitstatus = EXIT_FAILURE;
996
goto fallback;
997
}
998
999
plugin *next_plugin = proc->next;
1000
free_plugin(proc);
1001
proc = next_plugin;
1002
640
goto end;
641
}
642
/* Delete this process entry from the list */
643
if(process_list == proc){
644
/* First one - simple */
645
process_list = proc->next;
646
} else {
647
/* Second one or later */
648
for(process *p = process_list; p != NULL; p = p->next){
649
if(p->next == proc){
650
p->next = proc->next;
651
break;
652
}
653
}
654
}
1003
655
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
656
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
657
NULL);
1006
658
if(ret < 0){
1007
659
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1009
goto fallback;
1010
}
1011
1012
if(plugin_list == NULL){
1013
break;
1014
}
1015
1016
continue;
660
}
661
free(proc->buffer);
662
free(proc);
663
/* We deleted this process from the list, so we can't go
664
proc->next. Therefore, start over from the beginning of
665
the process list */
666
break;
1017
667
}
1018
1019
668
/* This process exited nicely, so print its buffer */
1020
1021
bool bret = print_out_password(proc->buffer,
1022
proc->buffer_length);
669
670
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1023
671
if(not bret){
1024
672
perror("print_out_password");
1025
673
exitstatus = EXIT_FAILURE;
1026
674
}
1027
goto fallback;
675
goto end;
1028
676
}
1029
1030
677
/* This process has not completed. Does it have any output? */
1031
678
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1032
679
/* This process had nothing to say at this time */
1033
proc = proc->next;
1034
680
continue;
1035
681
}
1036
682
/* Before reading, make the process' data buffer large enough */
1037
683
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1038
684
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
685
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
686
if (proc->buffer == NULL){
1041
687
perror("malloc");
1042
688
exitstatus = EXIT_FAILURE;
1043
goto fallback;
689
goto end;
1044
690
}
1045
691
proc->buffer_size += BUFFER_SIZE;
1046
692
}
1047
693
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1050
if(sret < 0){
694
ret = read(proc->fd, proc->buffer + proc->buffer_length,
695
BUFFER_SIZE);
696
if(ret < 0){
1051
697
/* Read error from this process; ignore the error */
1052
proc = proc->next;
1053
698
continue;
1054
699
}
1055
if(sret == 0){
700
if(ret == 0){
1056
701
/* got EOF */
1057
702
proc->eof = true;
1058
703
} else {
1059
proc->buffer_length += (size_t) sret;
704
proc->buffer_length += (size_t) ret;
1060
705
}
1061
706
}
1062
707
}
1063
1064
1065
fallback:
1066
708
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1068
/* Fallback if all plugins failed, none are found or an error
1069
occured */
709
if(process_list == NULL){
1070
710
bool bret;
1071
711
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1072
712
char *passwordbuffer = getpass("Password: ");
1073
size_t len = strlen(passwordbuffer);
1074
/* Strip trailing newline */
1075
if(len > 0 and passwordbuffer[len-1] == '\n'){
1076
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1077
len--;
713
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
714
if(not bret){
715
perror("print_out_password");
716
exitstatus = EXIT_FAILURE;
717
goto end;
1078
718
}
1079
bret = print_out_password(passwordbuffer, len);
719
bret = print_out_password("\n", 1);
1080
720
if(not bret){
1081
721
perror("print_out_password");
1082
722
exitstatus = EXIT_FAILURE;
1083
723
}
1084
724
}
725
726
end:
1085
727
1086
728
/* Restore old signal handler */
1087
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1088
if(ret == -1){
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1091
}
1092
1093
if(custom_argv != NULL){
1094
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1095
free(*arg);
1096
}
1097
free(custom_argv);
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
1098
738
}
1099
739
1100
740
if(dir != NULL){
1101
741
closedir(dir);
1102
742
}
1103
743
1104
/* Kill the processes */
1105
for(plugin *p = plugin_list; p != NULL; p = p->next){
1106
if(p->pid != 0){
1107
close(p->fd);
1108
ret = kill(p->pid, SIGTERM);
1109
if(ret == -1 and errno != ESRCH){
1110
/* Set-uid proccesses might not get closed */
1111
perror("kill");
1112
}
744
/* Free the process list and kill the processes */
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
1113
752
}
753
free(process_list->buffer);
754
free(process_list);
1114
755
}
1115
756
1116
757
/* Wait for any remaining child processes to terminate */
1121
762
perror("wait");
1122
763
}
1123
764
1124
free_plugin_list();
1125
1126
free(plugindir);
1127
free(argfile);
1128
1129
765
return exitstatus;
1130
766
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0