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-rw-r--r--usr.bin/ssh/sshconnect.c76
1 files changed, 42 insertions, 34 deletions
diff --git a/usr.bin/ssh/sshconnect.c b/usr.bin/ssh/sshconnect.c
index c8db7a8121c..950cfe2c375 100644
--- a/usr.bin/ssh/sshconnect.c
+++ b/usr.bin/ssh/sshconnect.c
@@ -13,7 +13,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: sshconnect.c,v 1.87 2000/12/28 14:25:03 markus Exp $");
+RCSID("$OpenBSD: sshconnect.c,v 1.88 2001/01/02 20:50:56 markus Exp $");
#include <openssl/bn.h>
#include <openssl/dsa.h>
@@ -413,7 +413,7 @@ read_yes_or_no(const char *prompt, int defval)
FILE *f;
int retval = -1;
- if (isatty(0))
+ if (isatty(STDIN_FILENO))
f = stdin;
else
f = fopen("/dev/tty", "rw");
@@ -467,7 +467,7 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
HostStatus ip_status;
int local = 0, host_ip_differ = 0;
char ntop[NI_MAXHOST];
- int host_line = -1, ip_line = -1;
+ int host_line, ip_line;
const char *host_file = NULL, *ip_file = NULL;
/*
@@ -490,23 +490,16 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
local = 0;
break;
}
- if (local) {
- if (options.host_key_alias == NULL) {
- debug("Forcing accepting of host key for "
- "loopback/localhost.");
- return;
- }
- if (options.check_host_ip)
- options.check_host_ip = 0;
+ if (local && options.host_key_alias == NULL) {
+ debug("Forcing accepting of host key for "
+ "loopback/localhost.");
+ return;
}
/*
- * Turn off check_host_ip for proxy connects, since
- * we don't have the remote ip-address
+ * We don't have the remote ip-address for connections
+ * using a proxy command
*/
- if (options.proxy_command != NULL && options.check_host_ip)
- options.check_host_ip = 0;
-
if (options.proxy_command == NULL) {
if (getnameinfo(hostaddr, hostaddr->sa_len, ntop, sizeof(ntop),
NULL, 0, NI_NUMERICHOST) != 0)
@@ -515,6 +508,13 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
} else {
ip = xstrdup("<no hostip for proxy command>");
}
+ /*
+ * Turn off check_host_ip if the connection is to localhost, via proxy
+ * command or if we don't have a hostname to compare with
+ */
+ if (options.check_host_ip &&
+ (local || strcmp(host, ip) == 0 || options.proxy_command != NULL))
+ options.check_host_ip = 0;
/*
* Allow the user to record the key under a different name. This is
@@ -546,7 +546,7 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
* Also perform check for the ip address, skip the check if we are
* localhost or the hostname was an ip address to begin with
*/
- if (options.check_host_ip && !local && strcmp(host, ip)) {
+ if (options.check_host_ip) {
Key *ip_key = key_new(host_key->type);
ip_file = user_hostfile;
@@ -571,21 +571,13 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
debug("Host '%.200s' is known and matches the %s host key.",
host, type);
debug("Found key in %s:%d", host_file, host_line);
- if (options.check_host_ip) {
- if (ip_status == HOST_NEW) {
- if (!add_host_to_hostfile(user_hostfile, ip, host_key))
- log("Failed to add the %s host key for IP address '%.30s' to the list of known hosts (%.30s).",
- type, ip, user_hostfile);
- else
- log("Warning: Permanently added the %s host key for IP address '%.30s' to the list of known hosts.",
- type, ip);
- } else if (ip_status != HOST_OK) {
- log("Warning: the %s host key for '%.200s' differs from the key for the IP address '%.30s'",
- type, host, ip);
- log("Found key in %s:%d", host_file, host_line);
- if (ip_line != -1)
- log("Offending key for IP in %s:%d", ip_file, ip_line);
- }
+ if (options.check_host_ip && ip_status == HOST_NEW) {
+ if (!add_host_to_hostfile(user_hostfile, ip, host_key))
+ log("Failed to add the %s host key for IP address '%.30s' to the list of known hosts (%.30s).",
+ type, ip, user_hostfile);
+ else
+ log("Warning: Permanently added the %s host key for IP address '%.30s' to the list of known hosts.",
+ type, ip);
}
break;
case HOST_NEW:
@@ -605,7 +597,7 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
if (!read_yes_or_no(prompt, -1))
fatal("Aborted by user!\n");
}
- if (options.check_host_ip && ip_status == HOST_NEW && strcmp(host, ip)) {
+ if (options.check_host_ip && ip_status == HOST_NEW) {
snprintf(hostline, sizeof(hostline), "%s,%s", host, ip);
hostp = hostline;
} else
@@ -636,7 +628,7 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
error("%s. This could either mean that", msg);
error("DNS SPOOFING is happening or the IP address for the host");
error("and its host key have changed at the same time.");
- if (ip_line != -1)
+ if (ip_status != HOST_NEW)
error("Offending key for IP in %s:%d", ip_file, ip_line);
}
/* The host key has changed. */
@@ -691,6 +683,22 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
break;
}
+ if (options.check_host_ip && host_status != HOST_CHANGED &&
+ ip_status == HOST_CHANGED) {
+ log("Warning: the %s host key for '%.200s' "
+ "differs from the key for the IP address '%.30s'",
+ type, host, ip);
+ if (host_status == HOST_OK)
+ log("Matching host key in %s:%d", host_file, host_line);
+ log("Offending key for IP in %s:%d", ip_file, ip_line);
+ if (options.strict_host_key_checking == 1) {
+ fatal("Exiting, you have requested strict checking.");
+ } else if (options.strict_host_key_checking == 2) {
+ if (!read_yes_or_no("Continue?", -1))
+ fatal("Aborted by user!\n");
+ }
+ }
+
xfree(ip);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-21 05:22:06 +0000