34 lines
1.3 KiB
Diff
34 lines
1.3 KiB
Diff
From f5c89caec93130da905a95602cf36a4e25f2303e Mon Sep 17 00:00:00 2001
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From: Daan De Meyer <daan.j.demeyer@gmail.com>
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Date: Mon, 20 Mar 2023 20:22:14 +0100
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Subject: Only set PAM_RHOST if the remote host is not "UNKNOWN"
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When using sshd's -i option with stdio that is not a AF_INET/AF_INET6
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socket, auth_get_canonical_hostname() returns "UNKNOWN" which is then
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set as the value of PAM_RHOST, causing pam to try to do a reverse DNS
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query of "UNKNOWN", which times out multiple times, causing a
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substantial slowdown when logging in.
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To fix this, let's only set PAM_RHOST if the hostname is not "UNKNOWN".
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Author: Daan De Meyer <daan.j.demeyer@gmail.com>
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Last-Update: 2024-04-03
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Patch-Name: pam-avoid-unknown-host.patch
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---
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auth-pam.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/auth-pam.c b/auth-pam.c
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index 13c0a792e..b22883b95 100644
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--- a/auth-pam.c
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+++ b/auth-pam.c
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@@ -735,7 +735,7 @@ sshpam_init(struct ssh *ssh, Authctxt *authctxt)
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sshpam_laddr = get_local_ipaddr(
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ssh_packet_get_connection_in(ssh));
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}
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- if (sshpam_rhost != NULL) {
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+ if (sshpam_rhost != NULL && strcmp(sshpam_rhost, "UNKNOWN") != 0) {
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debug("PAM: setting PAM_RHOST to \"%s\"", sshpam_rhost);
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sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST,
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sshpam_rhost);
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