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From c8d517bacd47f3d5c706a53561924ac20d0b3321 Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Fri, 7 Sep 2018 22:19:26 +0200
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Subject: [PATCH 20/21] getsockopt_wrapper: add support for PAM clients
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PAM clients expect that the private socket of the PAM responder is
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handled by root. With this patch getsockopt_wrapper can return the
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expected UID and GID to PAM clients.
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Related to https://pagure.io/SSSD/sssd/issue/3500
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Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
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(cherry picked with fixes from commit d332c8a0e7a4c7f0b3ee1b2110145a23cbd61c2a)
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---
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src/tests/intg/getsockopt_wrapper.c | 35 +++++++++++++++++++++++++++++
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1 file changed, 35 insertions(+)
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diff --git a/src/tests/intg/getsockopt_wrapper.c b/src/tests/intg/getsockopt_wrapper.c
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index 77c832329..eb8fa56dd 100644
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--- a/src/tests/intg/getsockopt_wrapper.c
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+++ b/src/tests/intg/getsockopt_wrapper.c
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@@ -9,6 +9,7 @@
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <dlfcn.h>
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+#include <stdlib.h>
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static bool is_dbus_socket(int fd)
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{
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@@ -27,6 +28,38 @@ static bool is_dbus_socket(int fd)
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return NULL != strstr(unix_socket->sun_path, "system_bus_socket");
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}
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+static bool peer_is_private_pam(int fd)
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+{
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+ int ret;
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+ struct sockaddr_storage addr = { 0 };
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+ socklen_t addrlen = sizeof(addr);
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+ struct sockaddr_un *unix_socket;
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+
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+ ret = getpeername(fd, (struct sockaddr *)&addr, &addrlen);
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+ if (ret != 0) return false;
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+
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+ if (addr.ss_family != AF_UNIX) return false;
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+
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+ unix_socket = (struct sockaddr_un *)&addr;
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+
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+ return NULL != strstr(unix_socket->sun_path, "private/pam");
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+}
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+
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+static void fake_peer_uid_gid(uid_t *uid, gid_t *gid)
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+{
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+ char *val;
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+
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+ val = getenv("SSSD_INTG_PEER_UID");
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+ if (val != NULL) {
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+ *uid = atoi(val);
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+ }
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+
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+ val = getenv("SSSD_INTG_PEER_GID");
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+ if (val != NULL) {
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+ *gid = atoi(val);
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+ }
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+}
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+
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typedef typeof(getsockopt) getsockopt_fn_t;
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static getsockopt_fn_t *orig_getsockopt = NULL;
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@@ -52,6 +85,8 @@ int getsockopt(int sockfd, int level, int optname,
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cr = optval;
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if (cr->uid != 0 && is_dbus_socket(sockfd)) {
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cr->uid = 0;
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+ } else if (peer_is_private_pam(sockfd)) {
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+ fake_peer_uid_gid(&cr->uid, &cr->gid);
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}
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}
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--
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2.19.1
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