Attachment 2000 Details for Bug 1213 – openssh-5.8p1 - patch for ssh-keyscan

[patch] openssh-5.8p1 - patch for ssh-keyscan

difs5.8 (text/plain), 8.40 KB, created by aab on 2011-02-24 04:40:19 AEDT

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Creator: aab

Created: 2011-02-24 04:40:19 AEDT

Size: 8.40 KB

patch

obsolete

>diff -u openssh-5.8p1/kex.c.orig openssh-5.8p1/kex.c
>--- openssh-5.8p1/kex.c.orig	2010-09-24 08:11:14.000000000 -0400
>+++ openssh-5.8p1/kex.c	2011-02-11 18:14:03.396688000 -0500
>@@ -49,6 +49,7 @@
> #include "dispatch.h"
> #include "monitor.h"
> #include "roaming.h"
>+#include "canohost.h"
> 
> #if OPENSSL_VERSION_NUMBER >= 0x00907000L
> # if defined(HAVE_EVP_SHA256)
>@@ -367,10 +368,10 @@
> {
> 	char *hostkeyalg = match_list(client, server, NULL);
> 	if (hostkeyalg == NULL)
>-		fatal("no hostkey alg");
>+		fatal("no '%.100s' hostkey alg(s) for %.200s", client, get_remote_ipaddr());
> 	k->hostkey_type = key_type_from_name(hostkeyalg);
> 	if (k->hostkey_type == KEY_UNSPEC)
>-		fatal("bad hostkey alg '%s'", hostkeyalg);
>+		fatal("bad hostkey alg '%s' for %.200s", hostkeyalg, get_remote_ipaddr());
> 	xfree(hostkeyalg);
> }
> 
>diff -u openssh-5.8p1/packet.c.orig openssh-5.8p1/packet.c
>--- openssh-5.8p1/packet.c.orig	2010-11-23 18:46:37.000000000 -0500
>+++ openssh-5.8p1/packet.c	2011-02-08 20:06:41.478474000 -0500
>@@ -1025,6 +1025,10 @@
>  * be used during the interactive session.
>  */
> 
>+int connclosed = 0;	/* = 1 if connection closed by remote server */
>+			/*     prior to necessary data being read    */
>+			/* currently used in ssh-keyscan.c           */
>+
> int
> packet_read_seqnr(u_int32_t *seqnr_p)
> {
>@@ -1035,6 +1039,8 @@
> 
> 	DBG(debug("packet_read()"));
> 
>+	connclosed = 0;
>+
> 	setp = (fd_set *)xcalloc(howmany(active_state->connection_in + 1,
> 	    NFDBITS), sizeof(fd_mask));
> 
>@@ -1100,11 +1106,12 @@
> 			    sizeof(buf), &cont);
> 		} while (len == 0 && cont);
> 		if (len == 0) {
>+			connclosed = 1;	/* if anybody wants to know  */
> 			logit("Connection closed by %.200s", get_remote_ipaddr());
> 			cleanup_exit(255);
> 		}
> 		if (len < 0)
>-			fatal("Read from socket failed: %.100s", strerror(errno));
>+			fatal("Read from %.200s failed: %.100s", get_remote_ipaddr(), strerror(errno));
> 		/* Append it to the buffer. */
> 		packet_process_incoming(buf, len);
> 	}
>diff -u openssh-5.8p1/ssh-keyscan.c.orig openssh-5.8p1/ssh-keyscan.c
>--- openssh-5.8p1/ssh-keyscan.c.orig	2011-01-06 06:44:45.000000000 -0500
>+++ openssh-5.8p1/ssh-keyscan.c	2011-02-13 14:57:40.136425000 -0500
>@@ -45,6 +45,7 @@
> #include "atomicio.h"
> #include "misc.h"
> #include "hostfile.h"
>+#include "canohost.h"
> 
> /* Flag indicating whether IPv4 or IPv6.  This can be set on the command line.
>    Default value is AF_UNSPEC means both IPv4 and IPv6. */
>@@ -70,6 +71,7 @@
> #define MAXCON (maxfd - 10)
> 
> extern char *__progname;
>+extern int  connclosed;
> fd_set *read_wait;
> size_t read_wait_nfdset;
> int ncon;
>@@ -92,6 +94,7 @@
> 	int c_len;		/* Total bytes which must be read. */
> 	int c_off;		/* Length of data read so far. */
> 	int c_keytype;		/* Only one of KT_RSA1, KT_DSA, or KT_RSA */
>+	int c_connclosed;	/* = 1 if previous closed connection */
> 	char *c_namebase;	/* Address to free for c_name and c_namelist */
> 	char *c_name;		/* Hostname of connection for errors */
> 	char *c_namelist;	/* Pointer to other possible addresses */
>@@ -243,6 +246,15 @@
> {
> 	int j;
> 
>+/*
>+ * New fd and socket.  Clear the possibly cached IP-address of the
>+ * remote host (kex.c:canonical_host_ip) of the previous socket.  Also
>+ * ensure that the packet_read_seqnr():Connection closed ..." flag is
>+ * clear (called by dispatch_run()).
>+ */
>+	clear_cached_addr();
>+	connclosed = 0;
>+
> 	packet_set_connection(c->c_fd, c->c_fd);
> 	enable_compat20();
> 	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
>@@ -296,8 +308,11 @@
> 	memset(&hints, 0, sizeof(hints));
> 	hints.ai_family = IPv4or6;
> 	hints.ai_socktype = SOCK_STREAM;
>-	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
>-		fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
>+	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
>+		error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
>+		s = -1;
>+		return s;
>+	}
> 	for (ai = aitop; ai; ai = ai->ai_next) {
> 		s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
> 		if (s < 0) {
>@@ -349,6 +364,7 @@
> 	fdcon[s].c_len = 4;
> 	fdcon[s].c_off = 0;
> 	fdcon[s].c_keytype = keytype;
>+	fdcon[s].c_connclosed = 0;
> 	gettimeofday(&fdcon[s].c_tv, NULL);
> 	fdcon[s].c_tv.tv_sec += timeout;
> 	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
>@@ -388,9 +404,23 @@
> {
> 	con *c = &fdcon[s];
> 	int ret;
>+	char *name;
> 
>-	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
>+/*
>+ * If "connclosed" isn't set, do the next host from c->c_namelist. Else,
>+ * restore the original string in c->c_namebase and redo the current
>+ * host.
>+ */
>+	name = c->c_namelist;		/* do next in list ??        */
>+	if (connclosed != 0) {
>+	    if (name && *name != '\0')	/* restore separator, if any */
>+		*(--name) = ',';
>+	    name = c->c_namebase;	/* redo current              */
>+	}
>+	ret = conalloc(name, c->c_output_name, c->c_keytype);
> 	confree(s);
>+	if (ret >= 0 && connclosed == s)
>+		fdcon[ret].c_connclosed = 1;	/* flag once         */
> 	return (ret);
> }
> 
>@@ -466,13 +496,42 @@
> 		confree(s);
> 		return;
> 	}
>-	if (c->c_keytype != KT_RSA1) {
>-		keyprint(c, keygrab_ssh2(c));
>-		confree(s);
>+	if (c->c_keytype == KT_RSA1) {
>+		c->c_status = CS_SIZE;
>+		contouch(s);
> 		return;
> 	}
>-	c->c_status = CS_SIZE;
>-	contouch(s);
>+/*
>+ * Read and print one of the ssh2 keys for this host.
>+ */
>+	keyprint(c, keygrab_ssh2(c));
>+
>+/*
>+ * We're done with this host if the `packet_read_seqnr()' function was
>+ * able to complete its data read.
>+ */
>+	if (connclosed == 0) {
>+		confree(s);
>+	}
>+/*
>+ * We're also done with this host if the `packet.c:packet_read_seqnr()'
>+ * function received an EOF while attempting to read data (probably
>+ * caused by the LoginGraceTime being exceeded on the host) and if this
>+ * is the second time this has occurred for this host.
>+ */
>+	else if (c->c_connclosed) {
>+		confree(s);
>+		connclosed = -1;  /* conrecycle other active sockets */
>+	}
>+/*
>+ * Else, give this host one and only one more chance with this key.  We
>+ * don't know if this timeout was caused because of slow responses by
>+ * previous hosts or the host itself (or both (:@{)).  This host and all
>+ * other hosts that currently have open sockets will be `conrecycled()'.
>+ */
>+	else {
>+		connclosed = s;
>+	}
> }
> 
> static void
>@@ -550,20 +609,48 @@
> 		if (FD_ISSET(i, e)) {
> 			error("%s: exception!", fdcon[i].c_name);
> 			confree(i);
>-		} else if (FD_ISSET(i, r))
>+		} else if (FD_ISSET(i, r)) {
> 			conread(i);
>+/*
>+ * Break if the read attempt in the `packet_read_seqnr()' function
>+ * failed because the remote host closed the connection before the
>+ * packet data read was complete.  The closure probably occurred because
>+ * the LoginGraceTime was exceeded on the remote `sshd' server.  All
>+ * hosts that currently have a viable "fdcon[s]" entry will be recycled
>+ * below to negate the time used waiting for the current "fdcon[i]"th
>+ * host to respond.  This is really a kludgy way to do this.
>+ */
>+			if (connclosed)
>+				break;
>+		}
> 	}
> 	xfree(r);
> 	xfree(e);
> 
> 	c = TAILQ_FIRST(&tq);
>-	while (c && (c->c_tv.tv_sec < now.tv_sec ||
>-	    (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
>+	i = -1;
>+	while (c && (connclosed ||
>+		     (c->c_tv.tv_sec < now.tv_sec ||
>+		      (c->c_tv.tv_sec == now.tv_sec &&
>+		       c->c_tv.tv_usec < now.tv_usec)))) {
> 		int s = c->c_fd;
> 
>+/*
>+ * If i >= 0, fdcon[i] should be the first of any new allocations that
>+ * were made as a result of the call(s) to conrecycle().
>+ */
>+		if (s == i)
>+			break;
> 		c = TAILQ_NEXT(c, c_link);
>-		conrecycle(s);
>+		s = conrecycle(s);
>+/*
>+ * Save fd of first new allocation.  If we encounter it again, we'll
>+ * know that we've cycled through all of the original queue.
>+ */
>+		if (i < 0)
>+			i = s;
> 	}
>+	connclosed = 0;
> }
> 
> static void
>@@ -583,6 +670,19 @@
> 	}
> }
> 
>+/*
>+ * Convert general remote aborts to continues for ssh-keyscan while
>+ * executing the `dispatch_run()' function.
>+ */
>+void
>+cleanup_exit(int i)
>+{
>+	if (nonfatal_fatal)
>+		longjmp(kexjmp, -1);
>+	else
>+		exit(i);
>+}
>+
> void
> fatal(const char *fmt,...)
> {
>@@ -715,7 +815,7 @@
> 		fdlim_set(maxfd);
> 	fdcon = xcalloc(maxfd, sizeof(con));
> 
>-	read_wait_nfdset = howmany(maxfd, NFDBITS);
>+	read_wait_nfdset = howmany(maxfd + 1, NFDBITS);
> 	read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
> 
> 	for (j = 0; j < fopt_count; j++) {

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