From d9add7bc6646db3641d4e2b189be62ac8f63185e Mon Sep 17 00:00:00 2001
From: jacob <jacob@cda61777-01e9-0310-a592-d414129be87e>
Date: Tue, 5 Sep 2006 21:39:30 +0000
Subject: [PATCH] Slight change to password expiry UI for the benefit of Cisco
 servers, which are as usual slightly odd.

git-svn-id: svn://svn.tartarus.org/sgt/putty@6845 cda61777-01e9-0310-a592-d414129be87e
---
 ssh.c | 38 ++++++++++++++++++++++++++++++++++----
 1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/ssh.c b/ssh.c
index fc68bf95..808327d0 100644
--- a/ssh.c
+++ b/ssh.c
@@ -7497,6 +7497,21 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 		    s->cur_prompt->instruction =
 			dupprintf("%.*s", prompt_len, prompt);
 		    s->cur_prompt->instr_reqd = TRUE;
+		    /*
+		     * There's no explicit requirement in the protocol
+		     * for the "old" passwords in the original and
+		     * password-change messages to be the same, and
+		     * apparently some Cisco kit supports password change
+		     * by the user entering a blank password originally
+		     * and the real password subsequently, so,
+		     * reluctantly, we prompt for the old password again.
+		     *
+		     * (On the other hand, some servers don't even bother
+		     * to check this field.)
+		     */
+		    add_prompt(s->cur_prompt,
+			       dupstr("Current password (blank for previously entered password): "),
+			       FALSE, SSH_MAX_PASSWORD_LEN);
 		    add_prompt(s->cur_prompt, dupstr("Enter new password: "),
 			       FALSE, SSH_MAX_PASSWORD_LEN);
 		    add_prompt(s->cur_prompt, dupstr("Confirm new password: "),
@@ -7530,10 +7545,25 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 			}
 
 			/*
-			 * Check the two passwords match.
+			 * If the user specified a new original password
+			 * (IYSWIM), overwrite any previously specified
+			 * one.
+			 * (A side effect is that the user doesn't have to
+			 * re-enter it if they louse up the new password.)
+			 */
+			if (s->cur_prompt->prompts[0]->result[0]) {
+			    memset(s->password, 0, strlen(s->password));
+				/* burn the evidence */
+			    sfree(s->password);
+			    s->password =
+				dupstr(s->cur_prompt->prompts[0]->result);
+			}
+
+			/*
+			 * Check the two new passwords match.
 			 */
-			got_new = (strcmp(s->cur_prompt->prompts[0]->result,
-					  s->cur_prompt->prompts[1]->result)
+			got_new = (strcmp(s->cur_prompt->prompts[1]->result,
+					  s->cur_prompt->prompts[2]->result)
 				   == 0);
 			if (!got_new)
 			    /* They don't. Silly user. */
@@ -7555,7 +7585,7 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 		    dont_log_password(ssh, s->pktout, PKTLOG_BLANK);
 		    ssh2_pkt_addstring(s->pktout, s->password);
 		    ssh2_pkt_addstring(s->pktout,
-				       s->cur_prompt->prompts[0]->result);
+				       s->cur_prompt->prompts[1]->result);
 		    free_prompts(s->cur_prompt);
 		    end_log_omission(ssh, s->pktout);
 		    ssh2_pkt_send(ssh, s->pktout);
-- 
2.11.0