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24.1.170
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: plugins.d/password-prompt.c
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- Committer: Björn Påhlsson
- Date: 2010-10-02 18:28:21 UTC
- mfrom: (237.4.6 mandos-release)
- mto: This revision was merged to the branch mainline in revision 453.
- Revision ID: belorn@fukt.bsnet.se-20101002182821-cazexo9y46o0g72o
Merge from release branch.
added
removed
plugins.d/password-prompt.c
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* Contact the authors at <mandos@fukt.bsnet.se>.
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*/
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#define _GNU_SOURCE /* getline(), asprintf() */
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#define _GNU_SOURCE /* getline() */
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#include <termios.h> /* struct termios, tcsetattr(),
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#include <termios.h> /* struct termios, tcsetattr(),
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TCSAFLUSH, tcgetattr(), ECHO */
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#include <unistd.h> /* struct termios, tcsetattr(),
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STDIN_FILENO, TCSAFLUSH,
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tcgetattr(), ECHO, readlink() */
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tcgetattr(), ECHO */
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#include <signal.h> /* sig_atomic_t, raise(), struct
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sigaction, sigemptyset(),
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sigaction(), sigaddset(), SIGINT,
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SIGQUIT, SIGHUP, SIGTERM,
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raise() */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
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ssize_t, open() */
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#include <sys/types.h> /* ssize_t */
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#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
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getenv(), free() */
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#include <dirent.h> /* scandir(), alphasort() */
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getenv() */
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#include <stdio.h> /* fprintf(), stderr, getline(),
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stdin, feof(), fputc(), vfprintf(),
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vasprintf() */
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stdin, feof(), fputc()
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*/
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#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
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EFAULT, EFBIG, EIO, ENOSPC, EINTR
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*/
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#include <error.h> /* error() */
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#include <iso646.h> /* or, not */
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#include <stdbool.h> /* bool, false, true */
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#include <inttypes.h> /* strtoumax() */
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#include <sys/stat.h> /* struct stat, lstat(), open() */
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#include <string.h> /* strlen, rindex, memcmp, strerror()
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*/
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#include <string.h> /* strlen, rindex */
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#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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argp_parse(), error_t,
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ARGP_ERR_UNKNOWN */
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#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
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EX_UNAVAILABLE, EX_IOERR, EX_OK */
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#include <fcntl.h> /* open() */
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#include <stdarg.h> /* va_list, va_start(), ... */
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volatile sig_atomic_t quit_now = 0;
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int signal_received;
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const char *argp_program_version = "password-prompt " VERSION;
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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/* Needed for conflict resolution */
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const char plymouth_name[] = "plymouthd";
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/* Function to use when printing errors */
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void error_plus(int status, int errnum, const char *formatstring,
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...){
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va_list ap;
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char *text;
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int ret;
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va_start(ap, formatstring);
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ret = vasprintf(&text, formatstring, ap);
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if (ret == -1){
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fprintf(stderr, "Mandos plugin %s: ",
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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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return;
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}
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fprintf(stderr, "Mandos plugin ");
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error(status, errnum, "%s", text);
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free(text);
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}
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static void termination_handler(int signum){
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if(quit_now){
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return;
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signal_received = signum;
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}
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bool conflict_detection(void){
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/* plymouth conflicts with password-prompt since both want to read
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from the terminal. Password-prompt will exit if it detects
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plymouth since plymouth performs the same functionality.
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*/
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int is_plymouth(const struct dirent *proc_entry){
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int ret;
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int cl_fd;
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{
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uintmax_t maxvalue;
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char *tmp;
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errno = 0;
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maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
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if(errno != 0 or *tmp != '\0'
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or maxvalue != (uintmax_t)((pid_t)maxvalue)){
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return 0;
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}
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}
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char *cmdline_filename;
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ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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proc_entry->d_name);
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if(ret == -1){
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error(0, errno, "asprintf");
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return 0;
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}
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/* Open /proc/<pid>/cmdline */
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cl_fd = open(cmdline_filename, O_RDONLY);
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free(cmdline_filename);
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if(cl_fd == -1){
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if(errno != ENOENT){
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error(0, errno, "open");
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}
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return 0;
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}
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char *cmdline = NULL;
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{
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size_t cmdline_len = 0;
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size_t cmdline_allocated = 0;
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char *tmp;
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const size_t blocksize = 1024;
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ssize_t sret;
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do {
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/* Allocate more space? */
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if(cmdline_len + blocksize + 1 > cmdline_allocated){
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tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
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if(tmp == NULL){
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error(0, errno, "realloc");
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free(cmdline);
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close(cl_fd);
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return 0;
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}
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cmdline = tmp;
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cmdline_allocated += blocksize;
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}
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/* Read data */
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sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
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if(sret == -1){
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error(0, errno, "read");
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free(cmdline);
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close(cl_fd);
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return 0;
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}
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cmdline_len += (size_t)sret;
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} while(sret != 0);
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ret = close(cl_fd);
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if(ret == -1){
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error(0, errno, "close");
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free(cmdline);
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return 0;
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}
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cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
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}
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/* we now have cmdline */
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/* get basename */
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char *cmdline_base = strrchr(cmdline, '/');
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if(cmdline_base != NULL){
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cmdline_base += 1; /* skip the slash */
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} else {
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cmdline_base = cmdline;
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}
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if(strcmp(cmdline_base, plymouth_name) != 0){
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if(debug){
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fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
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plymouth_name);
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}
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free(cmdline);
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return 0;
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}
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if(debug){
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fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
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plymouth_name);
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}
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free(cmdline);
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return 1;
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}
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struct dirent **direntries = NULL;
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int ret;
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ret = scandir("/proc", &direntries, is_plymouth, alphasort);
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if (ret == -1){
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error(1, errno, "scandir");
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}
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free(direntries);
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return ret > 0;
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}
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int main(int argc, char **argv){
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ssize_t sret;
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int ret;
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if(debug){
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fprintf(stderr, "Starting %s\n", argv[0]);
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}
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if (conflict_detection()){
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if(debug){
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fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
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}
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return EXIT_FAILURE;
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}
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if(debug){
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fprintf(stderr, "Storing current terminal attributes\n");
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}
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break;
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}
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}
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/* if(sret == 0), then the only sensible thing to do is to retry
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to read from stdin */
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/* if(sret == 0), then the only sensible thing to do is to retry to
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read from stdin */
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fputc('\n', stderr);
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if(debug and not quit_now){
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/* If quit_now is nonzero, we were interrupted by a signal, and
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