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From 08c49b78942d40c99fae8c40e7668aa73e1bd695 Mon Sep 17 00:00:00 2001
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From: Martin Sehnoutka <msehnout@redhat.com>
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Date: Tue, 6 Sep 2016 15:01:23 +0200
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Subject: [PATCH 05/59] Use hostname when calling PAM authentication module.
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Currently the vsftpd passes all logins as IP addresses
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into PAM. This prevents administrators from setting up
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ACLs based on domain (e.g. .example.com). This patch
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enables reverse host lookup and use hostname instead
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of address if there is one.
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---
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sysdeputil.c | 19 ++++++++++++++++---
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1 file changed, 16 insertions(+), 3 deletions(-)
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diff --git a/sysdeputil.c b/sysdeputil.c
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index 06f01f4..b2782da 100644
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--- a/sysdeputil.c
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+++ b/sysdeputil.c
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@@ -16,6 +16,10 @@
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#include "tunables.h"
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#include "builddefs.h"
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+/* For gethostbyaddr, inet_addr */
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+#include <netdb.h>
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+#include <arpa/inet.h>
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+
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/* For Linux, this adds nothing :-) */
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#include "port/porting_junk.h"
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@@ -323,6 +327,10 @@ vsf_sysdep_check_auth(struct mystr* p_user_str,
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const struct mystr* p_remote_host)
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{
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int retval = -1;
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+#ifdef PAM_RHOST
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+ struct sockaddr_in sin;
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+ struct hostent *host;
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+#endif
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pam_item_t item;
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const char* pam_user_name = 0;
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struct pam_conv the_conv =
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@@ -346,7 +354,12 @@ 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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- retval = pam_set_item(s_pamh, PAM_RHOST, str_getbuf(p_remote_host));
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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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if (retval != PAM_SUCCESS)
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{
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(void) pam_end(s_pamh, retval);
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@@ -559,7 +572,7 @@ vsf_sysdep_has_capabilities(void)
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}
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return s_runtime_has_caps;
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}
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-
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+
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#ifndef VSF_SYSDEP_HAVE_LIBCAP
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static int
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do_checkcap(void)
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@@ -1081,7 +1094,7 @@ vsf_sysutil_recv_fd(const int sock_fd)
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msg.msg_flags = 0;
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/* In case something goes wrong, set the fd to -1 before the syscall */
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p_fd = (int*)CMSG_DATA(CMSG_FIRSTHDR(&msg));
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- *p_fd = -1;
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+ *p_fd = -1;
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retval = recvmsg(sock_fd, &msg, 0);
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if (retval != 1)
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{
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--
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2.14.4
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