21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strtok, strlen(), strcpy(),
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,
101
103
/* Create a new plugin */
102
104
plugin *new_plugin = malloc(sizeof(plugin));
103
105
if (new_plugin == NULL){
107
new_plugin->name = name;
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
113
*new_plugin = (plugin) { .name = copy_name,
117
.next = *plugin_list };
108
119
new_plugin->argv = malloc(sizeof(char *) * 2);
109
120
if (new_plugin->argv == NULL){
113
new_plugin->argv[0] = name;
124
new_plugin->argv[0] = copy_name;
114
125
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
127
new_plugin->environ = malloc(sizeof(char *));
128
if(new_plugin->environ == NULL){
129
free(new_plugin->argv);
133
new_plugin->environ[0] = NULL;
118
134
/* Append the new plugin to the list */
119
135
*plugin_list = new_plugin;
120
136
return new_plugin;
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){
131
p->argv[p->argc] = NULL;
139
/* Helper function for add_argument and add_environment */
140
static bool add_to_char_array(const char *new, char ***array,
142
/* Resize the pointed-to array to hold one more pointer */
143
*array = realloc(*array, sizeof(char *)
144
* (size_t) ((*len) + 2));
149
/* Make a copy of the new string */
150
char *copy = strdup(new);
154
/* Insert the copy */
155
(*array)[*len] = copy;
157
/* Add a new terminating NULL pointer to the last element */
158
(*array)[*len] = NULL;
162
/* Add to a plugin's argument vector */
163
static bool add_argument(plugin *p, const char *arg){
167
return add_to_char_array(arg, &(p->argv), &(p->argc));
170
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
175
return add_to_char_array(def, &(p->environ), &(p->envc));
135
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
233
char **add_to_argv(char **argv, int *argc, char *arg){
236
argv = malloc(sizeof(char*) * 2);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
265
free(plugin_list->environ);
188
270
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
190
274
size_t d_name_len;
192
276
struct dirent *dirst;
200
284
struct sigaction old_sigchld_action;
201
285
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
286
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
287
char **custom_argv = NULL;
206
290
/* Establish a signal handler */
207
291
sigemptyset(&sigchld_action.sa_mask);
208
292
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
210
294
perror("sigaddset");
295
exitstatus = EXIT_FAILURE;
213
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
215
300
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
219
305
/* The options we understand. */
221
307
{ .name = "global-options", .key = 'g',
222
308
.arg = "OPTION[,OPTION[,...]]",
223
309
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
312
.doc = "Environment variable passed to all plugins" },
224
313
{ .name = "options-for", .key = 'o',
225
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
315
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
317
.arg = "PLUGIN:ENV=value",
318
.doc = "Environment variable passed to specified plugin" },
227
319
{ .name = "disable", .key = 'd',
229
321
.doc = "Disable a specific plugin", .group = 1 },
250
342
if (arg != NULL){
251
char *p = strtok(arg, ",");
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
344
while((p = strsep(&arg, ",")) != NULL){
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
360
char *envdef = strdup(arg);
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
259
370
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
375
char *opt = strsep(&arg, ":");
381
while((p = strsep(&opt, ",")) != NULL){
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
398
char *envdef = strchr(arg, ':');
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
272
413
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
414
plugin *p = getplugin(arg, plugins);
416
return ARGP_ERR_UNKNOWN;
309
451
if (ret == ARGP_ERR_UNKNOWN){
310
452
fprintf(stderr, "Unknown error while parsing arguments\n");
311
453
exitstatus = EXIT_FAILURE;
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
457
conffp = fopen(argfile, "r");
459
char *org_line = NULL;
460
char *p, *arg, *new_arg, *line;
463
const char whitespace_delims[] = " \r\t\f\v\n";
464
const char comment_delim[] = "#";
467
sret = getline(&org_line, &size, conffp);
473
arg = strsep(&line, comment_delim);
474
while((p = strsep(&arg, whitespace_delims)) != NULL){
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
489
/* Check for harmful errors and go to fallback. Other errors might
490
not affect opening plugins */
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
326
493
exitstatus = EXIT_FAILURE;
329
plus_argv[0] = argv[0];
331
arg = strtok(plus_options, delims); /* Get first argument */
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
338
exitstatus = EXIT_FAILURE;
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
498
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
346
501
if (ret == ARGP_ERR_UNKNOWN){
347
502
fprintf(stderr, "Unknown error while parsing arguments\n");
348
503
exitstatus = EXIT_FAILURE;
357
512
for(char **a = p->argv; *a != NULL; a++){
358
513
fprintf(stderr, "\tArg: %s\n", *a);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
516
for(char **a = p->environ; *a != NULL; a++){
517
fprintf(stderr, "\t%s\n", *a);
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
458
exitstatus = EXIT_FAILURE;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
465
621
ret = stat(filename, &st);
468
exitstatus = EXIT_FAILURE;
472
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
490
651
/* Add global arguments to argument list for this plugin */
491
652
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
654
for(char **a = g->argv + 1; *a != NULL; a++){
655
if(not add_argument(p, *a)){
656
perror("add_argument");
659
/* Add global environment variables */
660
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
662
perror("add_environment");
667
/* If this plugin has any environment variables, we will call
668
using execve and need to duplicate the environment from this
670
if(p->environ[0] != NULL){
671
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
677
if(not add_environment(p, copy)){
678
perror("add_environment");
497
684
ret = pipe(pipefd);
500
687
exitstatus = EXIT_FAILURE;
503
690
ret = set_cloexec_flag(pipefd[0]);
505
692
perror("set_cloexec_flag");
506
693
exitstatus = EXIT_FAILURE;
509
696
ret = set_cloexec_flag(pipefd[1]);
511
698
perror("set_cloexec_flag");
512
699
exitstatus = EXIT_FAILURE;
515
702
/* Block SIGCHLD until process is safely in process list */
516
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
518
705
perror("sigprocmask");
519
706
exitstatus = EXIT_FAILURE;
522
709
// Starting a new process to be watched
523
710
pid_t pid = fork();
713
exitstatus = EXIT_FAILURE;
525
717
/* this is the child process */
526
718
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
545
737
above and must now close it manually here. */
548
if(execv(filename, p->argv) < 0){
740
if(p->environ[0] == NULL){
741
if(execv(filename, p->argv) < 0){
746
if(execve(filename, p->argv, p->environ) < 0){
718
916
perror("print_out_password");
719
917
exitstatus = EXIT_FAILURE;
726
921
/* Restore old signal handler */
727
sigaction(SIGCHLD, &old_sigchld_action, NULL);
731
/* Free the plugin list */
732
for(plugin *next; plugin_list != NULL; plugin_list = next){
733
next = plugin_list->next;
734
free(plugin_list->argv);
922
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
925
exitstatus = EXIT_FAILURE;
928
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
934
free_plugin_list(plugin_list);