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110 lines
4.1 KiB
110 lines
4.1 KiB
3 years ago
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From 721de88621100f6ed33f1602415bc249f3ed3219 Mon Sep 17 00:00:00 2001
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From: Martin Sehnoutka <msehnout@redhat.com>
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Date: Thu, 17 Nov 2016 10:22:32 +0100
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Subject: [PATCH 19/59] Introduce reverse_lookup_enable option.
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vsftpd can transform IP address into hostname before
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PAM authentication. You can disable it to prevent
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performance issues.
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---
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parseconf.c | 1 +
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sysdeputil.c | 14 +++++++++-----
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tunables.c | 2 ++
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tunables.h | 1 +
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vsftpd.conf.5 | 9 +++++++++
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5 files changed, 22 insertions(+), 5 deletions(-)
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diff --git a/parseconf.c b/parseconf.c
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index 30df598..3e0dba4 100644
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--- a/parseconf.c
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+++ b/parseconf.c
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@@ -91,6 +91,7 @@ parseconf_bool_array[] =
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{ "mdtm_write", &tunable_mdtm_write },
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{ "lock_upload_files", &tunable_lock_upload_files },
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{ "pasv_addr_resolve", &tunable_pasv_addr_resolve },
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+ { "reverse_lookup_enable", &tunable_reverse_lookup_enable },
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{ "userlist_log", &tunable_userlist_log },
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{ "debug_ssl", &tunable_debug_ssl },
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{ "require_cert", &tunable_require_cert },
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diff --git a/sysdeputil.c b/sysdeputil.c
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index 3bbabaa..2063c87 100644
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--- a/sysdeputil.c
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+++ b/sysdeputil.c
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@@ -354,12 +354,16 @@ vsf_sysdep_check_auth(struct mystr* p_user_str,
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return 0;
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}
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#ifdef PAM_RHOST
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- sin.sin_addr.s_addr = inet_addr(str_getbuf(p_remote_host));
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- host = gethostbyaddr((char*)&sin.sin_addr.s_addr,sizeof(struct in_addr),AF_INET);
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- if (host != (struct hostent*)0)
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- retval = pam_set_item(s_pamh, PAM_RHOST, host->h_name);
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- else
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+ if (tunable_reverse_lookup_enable) {
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+ sin.sin_addr.s_addr = inet_addr(str_getbuf(p_remote_host));
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+ host = gethostbyaddr((char*)&sin.sin_addr.s_addr,sizeof(struct in_addr),AF_INET);
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+ if (host != (struct hostent*)0)
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+ retval = pam_set_item(s_pamh, PAM_RHOST, host->h_name);
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+ else
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+ retval = pam_set_item(s_pamh, PAM_RHOST, str_getbuf(p_remote_host));
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+ } else {
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retval = pam_set_item(s_pamh, PAM_RHOST, str_getbuf(p_remote_host));
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+ }
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if (retval != PAM_SUCCESS)
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{
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(void) pam_end(s_pamh, retval);
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diff --git a/tunables.c b/tunables.c
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index b30fca1..c737465 100644
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--- a/tunables.c
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+++ b/tunables.c
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@@ -72,6 +72,7 @@ int tunable_force_anon_data_ssl;
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int tunable_mdtm_write;
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int tunable_lock_upload_files;
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int tunable_pasv_addr_resolve;
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+int tunable_reverse_lookup_enable;
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int tunable_userlist_log;
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int tunable_debug_ssl;
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int tunable_require_cert;
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@@ -213,6 +214,7 @@ tunables_load_defaults()
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tunable_mdtm_write = 1;
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tunable_lock_upload_files = 1;
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tunable_pasv_addr_resolve = 0;
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+ tunable_reverse_lookup_enable = 1;
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tunable_userlist_log = 0;
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tunable_debug_ssl = 0;
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tunable_require_cert = 0;
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diff --git a/tunables.h b/tunables.h
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index e44d64c..9553038 100644
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--- a/tunables.h
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+++ b/tunables.h
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@@ -73,6 +73,7 @@ extern int tunable_force_anon_data_ssl; /* Require anon data uses SSL */
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extern int tunable_mdtm_write; /* Allow MDTM to set timestamps */
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extern int tunable_lock_upload_files; /* Lock uploading files */
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extern int tunable_pasv_addr_resolve; /* DNS resolve pasv_addr */
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+extern int tunable_reverse_lookup_enable; /* Get hostname before pam auth */
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extern int tunable_userlist_log; /* Log every failed login attempt */
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extern int tunable_debug_ssl; /* Verbose SSL logging */
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extern int tunable_require_cert; /* SSL client cert required */
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diff --git a/vsftpd.conf.5 b/vsftpd.conf.5
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index 72bb86f..fb6324e 100644
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--- a/vsftpd.conf.5
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+++ b/vsftpd.conf.5
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@@ -423,6 +423,15 @@ so you may want to disable it. For a discussion of the consequences, see
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http://scarybeastsecurity.blogspot.com/2009/02/vsftpd-210-released.html
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(Added in v2.1.0).
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+Default: YES
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+.TP
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+.B reverse_lookup_enable
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+Set to YES if you want vsftpd to transform the ip address into the hostname,
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+before pam authentication. This is useful if you use pam_access including the
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+hostname. If you want vsftpd to run on the environment where the reverse lookup
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+for some hostname is available and the name server doesn't respond for a while,
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+you should set this to NO to avoid a performance issue.
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+
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Default: YES
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.TP
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.B run_as_launching_user
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--
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2.14.4
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