From: Art Cancro <ajc@citadel.org>
Date: Tue, 19 Jun 2007 15:10:50 +0000 (+0000)
Subject: Added 'chkpw.c' utility for manually checking passwords.
X-Git-Tag: v7.86~3297
X-Git-Url: https://code.citadel.org/?a=commitdiff_plain;h=dba163badaa9fae3f922f84e371593ae33e994d9;p=citadel.git

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
index 000000000..ac3f779ca
--- /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);
+}