21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
#include <stdio.h> /* popen, fileno */
25
#include <iso646.h> /* and, or, not */
26
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
27
WIFEXITED, WEXITSTATUS, wait */
28
#include <sys/wait.h> /* wait */
29
#include <dirent.h> /* DIR, opendir */
30
#include <sys/stat.h> /* stat, struct stat */
31
#include <unistd.h> /* stat, struct stat, chdir */
32
#include <stdlib.h> /* EXIT_FAILURE */
33
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
35
#include <string.h> /* strlen, strcpy, strcat */
36
#include <stdbool.h> /* true */
37
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
38
#include <errno.h> /* errno */
39
#include <argp.h> /* argp */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
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(),
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(),
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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(),
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strtok, strlen(), strcpy(),
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, 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 */
67
#define BUFFER_SIZE 256
69
const char *argp_program_version = "mandos-client 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
95
131
p->argv[p->argc] = NULL;
98
#define BUFFER_SIZE 256
100
const char *argp_program_version =
101
"plugbasedclient 0.9";
102
const char *argp_program_bug_address =
103
"<mandos@fukt.bsnet.se>";
105
"Mandos plugin runner -- Run Mandos plugins";
106
/* A description of the arguments we accept. */
107
static char args_doc[] = "";
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
139
static int set_cloexec_flag(int fd)
141
int ret = fcntl(fd, F_GETFD, 0);
142
/* If reading the flags failed, return error indication now. */
146
/* Store modified flag word in the descriptor. */
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
150
process *process_list = NULL;
152
/* Mark a process as completed when it exits, and save its exit
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
157
pid_t pid = wait(&status);
162
while(proc != NULL and proc->pid != pid){
166
/* Process not found in process list */
169
proc->status = status;
170
proc->completed = true;
173
bool print_out_password(const char *buffer, size_t length){
175
if(length>0 and buffer[length-1] == '\n'){
178
for(size_t written = 0; written < length; written += (size_t)ret){
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
109
188
int main(int argc, char *argv[]){
110
char plugindir[] = "plugins.d";
111
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
113
192
struct dirent *dirst;
116
195
int ret, maxfd = 0;
117
process *process_list = NULL;
199
int exitstatus = EXIT_SUCCESS;
200
struct sigaction old_sigchld_action;
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
206
/* Establish a signal handler */
207
sigemptyset(&sigchld_action.sa_mask);
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
119
219
/* The options we understand. */
120
220
struct argp_option options[] = {
121
221
{ .name = "global-options", .key = 'g',
122
.arg = "option[,option[,...]]", .flags = 0,
123
.doc = "Options effecting all plugins" },
222
.arg = "OPTION[,OPTION[,...]]",
223
.doc = "Options passed to all plugins" },
124
224
{ .name = "options-for", .key = 'o',
125
.arg = "plugin:option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting only specified plugins" },
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
.doc = "Options passed only to specified plugin" },
227
{ .name = "disable", .key = 'd',
229
.doc = "Disable a specific plugin", .group = 1 },
230
{ .name = "plugin-dir", .key = 128,
232
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
130
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
131
/* Get the INPUT argument from `argp_parse', which we
132
know is a pointer to our arguments structure. */
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
133
247
plugin **plugins = state->input;
136
250
if (arg != NULL){
137
251
char *p = strtok(arg, ",");
139
addarguments(getplugin(NULL, plugins), p);
253
addargument(getplugin(NULL, plugins), p);
140
254
p = strtok(NULL, ",");
145
259
if (arg != NULL){
146
260
char *name = strtok(arg, ":");
147
261
char *p = strtok(NULL, ":");
150
addarguments(getplugin(name, plugins), p);
151
p = strtok(NULL, ",");
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
273
getplugin(arg, plugins)->disabled = true;
280
uid = (uid_t)strtol(arg, NULL, 10);
283
gid = (gid_t)strtol(arg, NULL, 10);
155
288
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
158
294
case ARGP_KEY_END:
166
302
plugin *plugin_list = NULL;
168
304
struct argp argp = { .options = options, .parser = parse_opt,
169
.args_doc = args_doc, .doc = doc };
171
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
173
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
174
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
175
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
176
/* fprintf(stderr, "\tArg: %s\n", *a); */
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
306
.doc = "Mandos plugin runner -- Run plugins" };
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
310
fprintf(stderr, "Unknown error while parsing arguments\n");
311
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){
326
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);
346
if (ret == ARGP_ERR_UNKNOWN){
347
fprintf(stderr, "Unknown error while parsing arguments\n");
348
exitstatus = EXIT_FAILURE;
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
356
p->name ? p->name : "Global", p->argc - 1);
357
for(char **a = p->argv; *a != NULL; a++){
358
fprintf(stderr, "\tArg: %s\n", *a);
182
373
dir = opendir(plugindir);
185
fprintf(stderr, "Can not open directory\n");
375
perror("Could not open plugin dir");
376
exitstatus = EXIT_FAILURE;
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
382
int dir_fd = dirfd(dir);
384
ret = set_cloexec_flag(dir_fd);
386
perror("set_cloexec_flag");
387
exitstatus = EXIT_FAILURE;
192
396
dirst = readdir(dir);
194
398
// All directory entries have been processed
195
399
if(dirst == NULL){
402
exitstatus = EXIT_FAILURE;
199
408
d_name_len = strlen(dirst->d_name);
201
// Ignore dotfiles and backup files
202
if (dirst->d_name[0] == '.'
203
or dirst->d_name[d_name_len - 1] == '~'){
207
char *filename = malloc(d_name_len + plugindir_len + 2);
208
strcpy(filename, plugindir);
209
strcat(filename, "/");
210
strcat(filename, dirst->d_name);
214
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
215
// Starting a new process to be watched
216
process *new_process = malloc(sizeof(process));
223
new_process->pid = fork();
224
if(new_process->pid == 0){
225
/* this is the child process */
410
// Ignore dotfiles, backup files and other junk
412
bool bad_name = false;
414
const char const *bad_prefixes[] = { ".", "#", NULL };
416
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
418
".dpkg-divert", NULL };
419
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
size_t pre_len = strlen(*pre);
421
if((d_name_len >= pre_len)
422
and strncmp((dirst->d_name), *pre, pre_len) == 0){
424
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
425
" with bad prefix %s\n", dirst->d_name, *pre);
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
size_t suf_len = strlen(*suf);
438
if((d_name_len >= suf_len)
439
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
442
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
443
" with bad suffix %s\n", dirst->d_name, *suf);
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
458
exitstatus = EXIT_FAILURE;
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
465
ret = stat(filename, &st);
468
exitstatus = EXIT_FAILURE;
472
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
474
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
475
" with bad type or mode\n", filename);
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
482
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
490
/* Add global arguments to argument list for this plugin */
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
500
exitstatus = EXIT_FAILURE;
503
ret = set_cloexec_flag(pipefd[0]);
505
perror("set_cloexec_flag");
506
exitstatus = EXIT_FAILURE;
509
ret = set_cloexec_flag(pipefd[1]);
511
perror("set_cloexec_flag");
512
exitstatus = EXIT_FAILURE;
515
/* Block SIGCHLD until process is safely in process list */
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
518
perror("sigprocmask");
519
exitstatus = EXIT_FAILURE;
522
// Starting a new process to be watched
525
/* this is the child process */
526
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
531
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
533
perror("sigprocmask");
537
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
544
/* If dir has no file descriptor, we could not set FD_CLOEXEC
545
above and must now close it manually here. */
227
close(pipefd[0]); /* close unused read end of pipe */
228
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
230
basename = strrchr(filename, '/');
231
if (basename == NULL){
236
plugin *p = getplugin(basename, &plugin_list);
238
plugin *g = getplugin(NULL, &plugin_list);
239
for(char **a = g->argv + 1; *a != NULL; a++){
242
if(execv(filename, p->argv) < 0){
249
close(pipefd[1]); /* close unused write end of pipe */
250
new_process->fd = pipefd[0];
251
new_process->buffer = malloc(BUFFER_SIZE);
252
if (new_process->buffer == NULL){
256
new_process->buffer_size = BUFFER_SIZE;
257
new_process->buffer_length = 0;
258
FD_SET(new_process->fd, &rfds_orig);
260
if (maxfd < new_process->fd){
261
maxfd = new_process->fd;
265
new_process->next = process_list;
266
process_list = new_process;
548
if(execv(filename, p->argv) < 0){
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
562
perror("sigprocmask");
564
exitstatus = EXIT_FAILURE;
568
*new_process = (struct process){ .pid = pid,
570
.next = process_list };
572
process_list = new_process;
573
/* Unblock SIGCHLD so signal handler can be run if this process
574
has already completed */
575
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
577
perror("sigprocmask");
578
exitstatus = EXIT_FAILURE;
582
FD_SET(new_process->fd, &rfds_all);
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
272
if (process_list != NULL){
274
fd_set rfds = rfds_orig;
275
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
276
if (select_ret == -1){
280
for(process *process_itr = process_list; process_itr != NULL;
281
process_itr = process_itr->next){
282
if(FD_ISSET(process_itr->fd, &rfds)){
283
if(process_itr->buffer_length + BUFFER_SIZE
284
> process_itr->buffer_size){
285
process_itr->buffer = realloc(process_itr->buffer,
286
process_itr->buffer_size
287
+ (size_t) BUFFER_SIZE);
288
if (process_itr->buffer == NULL){
292
process_itr->buffer_size += BUFFER_SIZE;
294
ret = read(process_itr->fd, process_itr->buffer
295
+ process_itr->buffer_length, BUFFER_SIZE);
297
/* Read error from this process; ignore it */
300
process_itr->buffer_length += (size_t) ret;
303
/* wait for process exit */
305
waitpid(process_itr->pid, &status, 0);
306
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
307
for(size_t written = 0;
308
written < process_itr->buffer_length;){
309
ret = write(STDOUT_FILENO,
310
process_itr->buffer + written,
311
process_itr->buffer_length - written);
316
written += (size_t)ret;
320
FD_CLR(process_itr->fd, &rfds_orig);
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
fd_set rfds = rfds_all;
607
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
608
if (select_ret == -1){
610
exitstatus = EXIT_FAILURE;
613
/* OK, now either a process completed, or something can be read
615
for(process *proc = process_list; proc ; proc = proc->next){
616
/* Is this process completely done? */
617
if(proc->eof and proc->completed){
618
/* Only accept the plugin output if it exited cleanly */
619
if(not WIFEXITED(proc->status)
620
or WEXITSTATUS(proc->status) != 0){
621
/* Bad exit by plugin */
623
if(WIFEXITED(proc->status)){
624
fprintf(stderr, "Plugin %u exited with status %d\n",
625
(unsigned int) (proc->pid),
626
WEXITSTATUS(proc->status));
627
} else if(WIFSIGNALED(proc->status)) {
628
fprintf(stderr, "Plugin %u killed by signal %d\n",
629
(unsigned int) (proc->pid),
630
WTERMSIG(proc->status));
631
} else if(WCOREDUMP(proc->status)){
632
fprintf(stderr, "Plugin %d dumped core\n",
633
(unsigned int) (proc->pid));
636
/* Remove the plugin */
637
FD_CLR(proc->fd, &rfds_all);
638
/* Block signal while modifying process_list */
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
641
perror("sigprocmask");
642
exitstatus = EXIT_FAILURE;
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
653
p->next = proc->next;
658
/* We are done modifying process list, so unblock signal */
659
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
662
perror("sigprocmask");
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
671
/* This process exited nicely, so print its buffer */
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
675
perror("print_out_password");
676
exitstatus = EXIT_FAILURE;
680
/* This process has not completed. Does it have any output? */
681
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
682
/* This process had nothing to say at this time */
685
/* Before reading, make the process' data buffer large enough */
686
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
687
proc->buffer = realloc(proc->buffer, proc->buffer_size
688
+ (size_t) BUFFER_SIZE);
689
if (proc->buffer == NULL){
691
exitstatus = EXIT_FAILURE;
694
proc->buffer_size += BUFFER_SIZE;
696
/* Read from the process */
697
ret = read(proc->fd, proc->buffer + proc->buffer_length,
700
/* Read error from this process; ignore the error */
707
proc->buffer_length += (size_t) ret;
330
for(process *process_itr = process_list; process_itr != NULL;
331
process_itr = process_itr->next){
332
close(process_itr->fd);
333
kill(process_itr->pid, SIGTERM);
334
free(process_itr->buffer);
715
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
716
/* Fallback if all plugins failed or an error occured */
718
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
719
char *passwordbuffer = getpass("Password: ");
720
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
722
perror("print_out_password");
723
exitstatus = EXIT_FAILURE;
728
/* Restore old signal handler */
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
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);
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 */
753
free(process_list->buffer);
757
/* Wait for any remaining child processes to terminate */