32
31
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
33
32
#include <iso646.h> /* and, or, not*/
34
33
#include <errno.h> /* errno, EINTR */
35
35
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
37
37
#include <stddef.h> /* NULL */
38
#include <string.h> /* strlen(), memcmp() */
39
#include <stdio.h> /* asprintf(), perror() */
38
#include <string.h> /* strlen(), memcmp(), strerror() */
39
#include <stdio.h> /* asprintf(), vasprintf(), vprintf(), fprintf() */
40
40
#include <unistd.h> /* close(), write(), readlink(),
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read(), STDOUT_FILENO, sleep(),
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fork(), setuid(), geteuid(),
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setsid(), chdir(), dup2(),
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STDERR_FILENO, execv() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
46
realloc(), EXIT_SUCCESS, malloc(),
48
#include <stdlib.h> /* getenv() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
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EXIT_SUCCESS, malloc(), _exit(),
49
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#include <dirent.h> /* opendir(), readdir(), closedir() */
49
#include <inttypes.h> /* intmax_t, strtoimax() */
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#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
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#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
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#include <argz.h> /* argz_count(), argz_extract() */
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#include <stdarg.h> /* va_list, va_start(), ... */
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sig_atomic_t interrupted_by_signal = 0;
54
static void termination_handler(__attribute__((unused))int signum){
57
const char usplash_name[] = "/sbin/usplash";
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/* Function to use when printing errors */
60
void error_plus(int status, int errnum, const char *formatstring, ...){
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va_start(ap, formatstring);
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ret = vasprintf(&text, formatstring, ap);
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fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
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vfprintf(stderr, formatstring, ap);
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fprintf(stderr, ": ");
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fprintf(stderr, "%s\n", strerror(errnum));
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error(status, errno, "vasprintf while printing error");
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fprintf(stderr, "Mandos plugin ");
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error(status, errnum, "%s", text);
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static void termination_handler(int signum){
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if(interrupted_by_signal){
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84
interrupted_by_signal = 1;
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signal_received = signum;
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static bool usplash_write(const char *cmd, const char *arg){
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static bool usplash_write(int *fifo_fd_r,
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const char *cmd, const char *arg){
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* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
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* usplash_write("PULSATE", NULL) will write "PULSATE\0"
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* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
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* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
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fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
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if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
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ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
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}while(fifo_fd == -1);
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105
const char *cmd_line;
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106
size_t cmd_line_len;
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107
char *cmd_line_alloc = NULL;
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cmd_line_len = strlen(cmd);
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cmd_line_len = strlen(cmd) + 1;
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ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
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if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
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TEMP_FAILURE_RETRY(close(*fifo_fd_r));
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cmd_line = cmd_line_alloc;
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cmd_line_len = (size_t)ret + 1;
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size_t written = 0;
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while(not interrupted_by_signal and written < cmd_line_len){
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ret = write(fifo_fd, cmd_line + written,
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cmd_line_len - written);
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if(errno != EINTR or interrupted_by_signal){
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free(cmd_line_alloc);
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while(written < cmd_line_len){
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sret = write(*fifo_fd_r, cmd_line + written,
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cmd_line_len - written);
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TEMP_FAILURE_RETRY(close(*fifo_fd_r));
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free(cmd_line_alloc);
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written += (size_t)ret;
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written += (size_t)sret;
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139
free(cmd_line_alloc);
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ret = close(fifo_fd);
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if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
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if(interrupted_by_signal){
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/* Create prompt string */
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char *makeprompt(void){
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const char *const cryptsource = getenv("cryptsource");
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const char *const crypttarget = getenv("crypttarget");
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const char prompt_start[] = "Enter passphrase to unlock the disk";
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if(cryptsource == NULL){
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if(crypttarget == NULL){
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ret = asprintf(&prompt, "%s: ", prompt_start);
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ret = asprintf(&prompt, "%s (%s): ", prompt_start,
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if(crypttarget == NULL){
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ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
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ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
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cryptsource, crypttarget);
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pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
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char *cmdline = NULL;
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size_t cmdline_len = 0;
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DIR *proc_dir = opendir("/proc");
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if(proc_dir == NULL){
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error_plus(0, errno, "opendir");
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for(struct dirent *proc_ent = readdir(proc_dir);
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proc_ent = readdir(proc_dir)){
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tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
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if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
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or tmpmax != (pid_t)tmpmax){
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/* Find the executable name by doing readlink() on the
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/proc/<pid>/exe link */
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char exe_target[sizeof(usplash_name)];
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/* create file name string */
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ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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error_plus(0, errno, "asprintf");
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goto fail_find_usplash;
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/* Check that it refers to a symlink owned by root:root */
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struct stat exe_stat;
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ret = lstat(exe_link, &exe_stat);
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error_plus(0, errno, "lstat");
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goto fail_find_usplash;
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if(not S_ISLNK(exe_stat.st_mode)
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or exe_stat.st_uid != 0
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or exe_stat.st_gid != 0){
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sret = readlink(exe_link, exe_target, sizeof(exe_target));
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/* Compare executable name */
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if((sret != ((ssize_t)sizeof(exe_target)-1))
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or (memcmp(usplash_name, exe_target,
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sizeof(exe_target)-1) != 0)){
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/* Read and save the command line of usplash in "cmdline" */
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/* Open /proc/<pid>/cmdline */
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char *cmdline_filename;
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ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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error_plus(0, errno, "asprintf");
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goto fail_find_usplash;
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cl_fd = open(cmdline_filename, O_RDONLY);
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free(cmdline_filename);
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error_plus(0, errno, "open");
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goto fail_find_usplash;
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size_t cmdline_allocated = 0;
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const size_t blocksize = 1024;
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/* Allocate more space? */
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if(cmdline_len + blocksize > cmdline_allocated){
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tmp = realloc(cmdline, cmdline_allocated + blocksize);
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error_plus(0, errno, "realloc");
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goto fail_find_usplash;
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cmdline_allocated += blocksize;
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sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
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error_plus(0, errno, "read");
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goto fail_find_usplash;
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cmdline_len += (size_t)sret;
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error_plus(0, errno, "close");
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goto fail_find_usplash;
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/* Close directory */
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ret = closedir(proc_dir);
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error_plus(0, errno, "closedir");
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goto fail_find_usplash;
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*cmdline_r = cmdline;
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*cmdline_len_r = cmdline_len;
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if(proc_dir != NULL){
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int main(__attribute__((unused))int argc,
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__attribute__((unused))char **argv){
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bool an_error_occured = false;
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pid_t usplash_pid = -1;
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bool usplash_accessed = false;
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int status = EXIT_FAILURE; /* Default failure exit status */
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/* Create prompt string */
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const char *const cryptsource = getenv("cryptsource");
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const char *const crypttarget = getenv("crypttarget");
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const char prompt_start[] = "Enter passphrase to unlock the disk";
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if(cryptsource == NULL){
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if(crypttarget == NULL){
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ret = asprintf(&prompt, "%s: ", prompt_start);
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ret = asprintf(&prompt, "%s (%s): ", prompt_start,
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if(crypttarget == NULL){
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ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
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ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
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cryptsource, crypttarget);
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char *prompt = makeprompt();
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/* Find usplash process */
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pid_t usplash_pid = 0;
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char *cmdline = NULL;
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size_t cmdline_len = 0;
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const char usplash_name[] = "/sbin/usplash";
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DIR *proc_dir = opendir("/proc");
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if(proc_dir == NULL){
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for(struct dirent *proc_ent = readdir(proc_dir);
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proc_ent = readdir(proc_dir)){
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pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
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/* Find the executable name by doing readlink() on the
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/proc/<pid>/exe link */
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char exe_target[sizeof(usplash_name)];
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/* create file name string */
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ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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/* Check that it refers to a symlink owned by root:root */
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struct stat exe_stat;
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ret = lstat(exe_link, &exe_stat);
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if(not S_ISLNK(exe_stat.st_mode)
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or exe_stat.st_uid != 0
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or exe_stat.st_gid != 0){
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sret = readlink(exe_link, exe_target, sizeof(exe_target));
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if((sret == ((ssize_t)sizeof(exe_target)-1))
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and (memcmp(usplash_name, exe_target,
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sizeof(exe_target)-1) == 0)){
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/* Read and save the command line of usplash in "cmdline" */
220
/* Open /proc/<pid>/cmdline */
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char *cmdline_filename;
224
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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cl_fd = open(cmdline_filename, O_RDONLY);
235
free(cmdline_filename);
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free(cmdline_filename);
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size_t cmdline_allocated = 0;
244
const size_t blocksize = 1024;
246
if(cmdline_len + blocksize > cmdline_allocated){
247
tmp = realloc(cmdline, cmdline_allocated + blocksize);
256
cmdline_allocated += blocksize;
258
sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
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cmdline_len += (size_t)sret;
336
usplash_pid = find_usplash(&cmdline, &cmdline_len);
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337
if(usplash_pid == 0){
338
status = EX_UNAVAILABLE;
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342
/* Set up the signal handler */
284
345
new_action = { .sa_handler = termination_handler,
286
347
sigemptyset(&new_action.sa_mask);
287
sigaddset(&new_action.sa_mask, SIGINT);
288
sigaddset(&new_action.sa_mask, SIGHUP);
289
sigaddset(&new_action.sa_mask, SIGTERM);
348
ret = sigaddset(&new_action.sa_mask, SIGINT);
350
error_plus(0, errno, "sigaddset");
354
ret = sigaddset(&new_action.sa_mask, SIGHUP);
356
error_plus(0, errno, "sigaddset");
360
ret = sigaddset(&new_action.sa_mask, SIGTERM);
362
error_plus(0, errno, "sigaddset");
290
366
ret = sigaction(SIGINT, NULL, &old_action);
369
error_plus(0, errno, "sigaction");
296
374
if(old_action.sa_handler != SIG_IGN){
297
375
ret = sigaction(SIGINT, &new_action, NULL);
378
error_plus(0, errno, "sigaction");
304
384
ret = sigaction(SIGHUP, NULL, &old_action);
387
error_plus(0, errno, "sigaction");
310
392
if(old_action.sa_handler != SIG_IGN){
311
393
ret = sigaction(SIGHUP, &new_action, NULL);
396
error_plus(0, errno, "sigaction");
318
402
ret = sigaction(SIGTERM, NULL, &old_action);
405
error_plus(0, errno, "sigaction");
324
410
if(old_action.sa_handler != SIG_IGN){
325
411
ret = sigaction(SIGTERM, &new_action, NULL);
414
error_plus(0, errno, "sigaction");
422
usplash_accessed = true;
334
423
/* Write command to FIFO */
335
if(not interrupted_by_signal){
336
if(not usplash_write("TIMEOUT", "0")
337
and (errno != EINTR)){
338
perror("usplash_write");
339
an_error_occured = true;
342
if(not interrupted_by_signal and not an_error_occured){
343
if(not usplash_write("INPUTQUIET", prompt)
344
and (errno != EINTR)){
345
perror("usplash_write");
346
an_error_occured = true;
424
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
426
error_plus(0, errno, "usplash_write");
432
if(interrupted_by_signal){
436
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
438
error_plus(0, errno, "usplash_write");
444
if(interrupted_by_signal){
351
/* This is not really a loop; while() is used to be able to "break"
352
out of it; those breaks are marked "Big" */
353
while(not interrupted_by_signal and not an_error_occured){
360
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
364
an_error_occured = true;
367
if(interrupted_by_signal){
371
}while(fifo_fd == -1);
372
if(interrupted_by_signal or an_error_occured){
377
size_t buf_allocated = 0;
378
const size_t blocksize = 1024;
380
if(buf_len + blocksize > buf_allocated){
381
char *tmp = realloc(buf, buf_allocated + blocksize);
384
an_error_occured = true;
388
buf_allocated += blocksize;
391
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
395
an_error_occured = true;
398
if(interrupted_by_signal){
403
if(interrupted_by_signal or an_error_occured){
407
buf_len += (size_t)sret;
410
if(interrupted_by_signal or an_error_occured){
414
if(not usplash_write("TIMEOUT", "15")
415
and (errno != EINTR)){
416
perror("usplash_write");
417
an_error_occured = true;
419
if(interrupted_by_signal or an_error_occured){
423
/* Print password to stdout */
425
while(written < buf_len){
427
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
431
an_error_occured = true;
434
if(interrupted_by_signal){
439
if(interrupted_by_signal or an_error_occured){
442
written += (size_t)sret;
445
if(not interrupted_by_signal and not an_error_occured){
450
} /* end of non-loop while() */
452
/* If we got here, an error or interrupt must have happened */
454
/* Create argc and argv for new usplash*/
455
int cmdline_argc = 0;
456
char **cmdline_argv = malloc(sizeof(char *));
459
while(position < cmdline_len){
460
char **tmp = realloc(cmdline_argv,
462
* (size_t)(cmdline_argc + 2)));
451
/* Read reply from usplash */
453
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
454
if(outfifo_fd == -1){
456
error_plus(0, errno, "open");
462
if(interrupted_by_signal){
467
size_t buf_allocated = 0;
468
const size_t blocksize = 1024;
470
/* Allocate more space */
471
if(buf_len + blocksize > buf_allocated){
472
char *tmp = realloc(buf, buf_allocated + blocksize);
469
cmdline_argv[cmdline_argc] = cmdline + position;
471
position += strlen(cmdline + position) + 1;
473
cmdline_argv[cmdline_argc] = NULL;
475
error_plus(0, errno, "realloc");
481
buf_allocated += blocksize;
483
sret = read(outfifo_fd, buf + buf_len,
484
buf_allocated - buf_len);
487
error_plus(0, errno, "read");
490
TEMP_FAILURE_RETRY(close(outfifo_fd));
493
if(interrupted_by_signal){
497
buf_len += (size_t)sret;
499
ret = close(outfifo_fd);
502
error_plus(0, errno, "close");
509
if(interrupted_by_signal){
513
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
515
error_plus(0, errno, "usplash_write");
521
if(interrupted_by_signal){
525
ret = close(fifo_fd);
528
error_plus(0, errno, "close");
535
/* Print password to stdout */
537
while(written < buf_len){
539
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
542
error_plus(0, errno, "write");
549
if(interrupted_by_signal){
552
written += (size_t)sret;
557
if(interrupted_by_signal){
570
/* If usplash was never accessed, we can stop now */
571
if(not usplash_accessed){
577
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
578
if(ret == -1 and errno != EINTR){
579
error_plus(0, errno, "close");
584
/* Close output FIFO */
585
if(outfifo_fd != -1){
586
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
588
error_plus(0, errno, "close");
592
/* Create argv for new usplash*/
593
char **cmdline_argv = malloc((argz_count(cmdline, cmdline_len) + 1)
594
* sizeof(char *)); /* Count args */
595
if(cmdline_argv == NULL){
596
error_plus(0, errno, "malloc");
599
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
475
601
/* Kill old usplash */
476
602
kill(usplash_pid, SIGTERM);