Added 'chkpw.c' utility for manually checking passwords.

This is not yet integrated into the build.

diff --git a/citadel/chkpw.c b/citadel/chkpw.c
new file mode 100644 (file)
index 0000000..ac3f779
--- /dev/null
+++ b/citadel/chkpw.c
@@ -0,0 +1,104 @@
+/* 
+ *
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <pwd.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <string.h>
+#include <limits.h>
+
+/* These pipes are used to talk to the chkpwd daemon, which is forked during startup */
+int chkpwd_write_pipe[2];
+int chkpwd_read_pipe[2];
+
+/*
+ * Validate a password on the host unix system by talking to the chkpwd daemon
+ */
+static int validpw(uid_t uid, const char *pass)
+{
+       char buf[256];
+
+       snprintf(buf, sizeof buf, "%016d", uid);
+       write(chkpwd_write_pipe[1], buf, 16);
+       write(chkpwd_write_pipe[1], pass, 256);
+       read(chkpwd_read_pipe[0], buf, 4);
+
+       if (!strncmp(buf, "PASS", 4)) {
+               printf("pass\n");
+               return(1);
+       }
+
+       printf("fail\n");
+       return 0;
+}
+
+/* 
+ * Start up the chkpwd daemon so validpw() has something to talk to
+ */
+void start_chkpwd_daemon(void) {
+       pid_t chkpwd_pid;
+       int i;
+
+       printf("Starting chkpwd daemon for host authentication mode\n");
+
+       if (pipe(chkpwd_write_pipe) != 0) {
+               printf("Unable to create pipe for chkpwd daemon: %s\n", strerror(errno));
+               abort();
+       }
+       if (pipe(chkpwd_read_pipe) != 0) {
+               printf("Unable to create pipe for chkpwd daemon: %s\n", strerror(errno));
+               abort();
+       }
+
+       chkpwd_pid = fork();
+       if (chkpwd_pid < 0) {
+               printf("Unable to fork chkpwd daemon: %s\n", strerror(errno));
+               abort();
+       }
+       if (chkpwd_pid == 0) {
+               dup2(chkpwd_write_pipe[0], 0);
+               dup2(chkpwd_read_pipe[1], 1);
+               for (i=2; i<256; ++i) close(i);
+               execl("./chkpwd", "chkpwd", NULL);
+               printf("Unable to exec chkpwd daemon: %s\n", strerror(errno));
+               abort();
+               exit(errno);
+       }
+}
+
+
+
+int main(int argc, char **argv) {
+       char buf[256];
+       struct passwd *p;
+       int uid;
+       
+       printf("\n\n ** host auth mode test utility **\n\n");
+       start_chkpwd_daemon();
+
+       while(1) {
+               printf("\n\nUsername: ");
+               gets(buf);
+               p = getpwnam(buf);
+               if (p == NULL) {
+                       printf("Not found\n");
+               }
+               else {
+                       uid = p->pw_uid;
+                       printf("     uid: %d\n", uid);
+                       printf("Password: ");
+                       gets(buf);
+                       validpw(uid, buf);
+               }
+       }
+
+       return(0);
+}