Hi!
Currently openvpn-auth-pam plugin does not set PAM_RHOST(requesting
host) variable. This is needed when for example pam_access.so plugin
is used and based on OpenVPN client network, different authentication
methods are desired. Proof of concept patch for PAM_RHOST is
following:
--- /var/tmp/auth-pam.c.orig 2018-01-24 21:26:06.262178266 +0200
+++ auth-pam.c 2018-01-25 01:23:14.669019911 +0200
@@ -110,6 +110,8 @@
char username[128];
char password[128];
+ char untrusted_ip[128];
+ char untrusted_ip6[128];
char common_name[128];
const struct name_value_list *name_value_list;
@@ -451,6 +453,8 @@
/* get username/password from envp string array */
const char *username = get_env("username", envp);
const char *password = get_env("password", envp);
+ const char *untrusted_ip = get_env ("untrusted_ip", envp) ?
get_env("untrusted_ip", envp) : "";
+ const char *untrusted_ip6 = get_env ("untrusted_ip6", envp) ?
get_env("untrusted_ip6", envp) : "";
const char *common_name = get_env("common_name", envp) ?
get_env("common_name", envp) : "";
if (username && strlen(username) > 0 && password)
@@ -458,6 +462,8 @@
if (send_control(context->foreground_fd, COMMAND_VERIFY) == -1
|| send_string(context->foreground_fd, username) == -1
|| send_string(context->foreground_fd, password) == -1
+ || send_string(context->foreground_fd, untrusted_ip) == -1
+ || send_string(context->foreground_fd, untrusted_ip6) == -1
|| send_string(context->foreground_fd, common_name) == -1)
{
fprintf(stderr, "AUTH-PAM: Error sending auth info to
background process\n");
@@ -681,6 +687,16 @@
status = pam_start(service, name_value_list_provided ? NULL :
up->username, &conv, &pamh);
if (status == PAM_SUCCESS)
{
+
+ if (strlen(up->untrusted_ip) > 0)
+ {
+ pam_set_item(pamh, PAM_RHOST, up->untrusted_ip);
+ }
+ else
+ {
+ pam_set_item(pamh, PAM_RHOST, up->untrusted_ip6);
+ }
+
/* Call PAM to verify username/password */
status = pam_authenticate(pamh, 0);
if (status == PAM_SUCCESS)
@@ -770,6 +786,8 @@
case COMMAND_VERIFY:
if (recv_string(fd, up.username, sizeof(up.username)) == -1
|| recv_string(fd, up.password, sizeof(up.password)) == -1
+ || recv_string(fd, up.untrusted_ip,
sizeof(up.untrusted_ip)) == -1
+ || recv_string(fd, up.untrusted_ip6,
sizeof(up.untrusted_ip6)) == -1
|| recv_string(fd, up.common_name,
sizeof(up.common_name)) == -1)
{
fprintf(stderr, "AUTH-PAM: BACKGROUND: read error
on command channel: code=%d, exiting\n",
WBR,
Martin
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