From d0986e46b74de3b131fccbf79bd00de5ff054f71 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Sat, 6 Jun 2015 18:59:27 -0400 Subject: [PATCH] sd-bus: do not use per-datagram auxiliary information SELinux information cannot be retrieved this way, since we are using stream unix sockets and SCM_SECURITY does not work for them. SCM_CREDENTIALS use dropped to be consistent. We also should get this information at connection time. https://bugzilla.redhat.com/show_bug.cgi?id=1224211 "SCM_SECURITY was only added for datagram sockets." Cherry-picked from: d868f2a Related: #1230190 --- src/libsystemd/sd-bus/bus-socket.c | 70 +++++------------------------- 1 file changed, 12 insertions(+), 58 deletions(-) diff --git a/src/libsystemd/sd-bus/bus-socket.c b/src/libsystemd/sd-bus/bus-socket.c index 52883fa8c..abd9ece01 100644 --- a/src/libsystemd/sd-bus/bus-socket.c +++ b/src/libsystemd/sd-bus/bus-socket.c @@ -501,9 +501,7 @@ static int bus_socket_read_auth(sd_bus *b) { void *p; union { struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX) + - CMSG_SPACE(sizeof(struct ucred)) + - CMSG_SPACE(NAME_MAX)]; /*selinux label */ + uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; } control; struct cmsghdr *cmsg; bool handle_cmsg = false; @@ -556,8 +554,8 @@ static int bus_socket_read_auth(sd_bus *b) { b->rbuffer_size += k; - if (handle_cmsg) { - for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) { + if (handle_cmsg) + for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { int j; @@ -568,31 +566,9 @@ static int bus_socket_read_auth(sd_bus *b) { j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); close_many((int*) CMSG_DATA(cmsg), j); return -EIO; - - } else if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_CREDENTIALS && - cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { - - /* Ignore bogus data, which we might - * get on socketpair() sockets */ - if (((struct ucred*) CMSG_DATA(cmsg))->pid != 0) { - memcpy(&b->ucred, CMSG_DATA(cmsg), sizeof(struct ucred)); - b->ucred_valid = true; - } - - } else if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_SECURITY) { - - size_t l; - - l = cmsg->cmsg_len - CMSG_LEN(0); - if (l > 0) { - memcpy(&b->label, CMSG_DATA(cmsg), l); - b->label[l] = 0; - } - } - } - } + } else + log_debug("Got unexpected auxiliary data with level=%d and type=%d", + cmsg->cmsg_level, cmsg->cmsg_type); r = bus_socket_auth_verify(b); if (r != 0) @@ -945,9 +921,7 @@ int bus_socket_read_message(sd_bus *bus) { void *b; union { struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX) + - CMSG_SPACE(sizeof(struct ucred)) + - CMSG_SPACE(NAME_MAX)]; /*selinux label */ + uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; } control; struct cmsghdr *cmsg; bool handle_cmsg = false; @@ -995,8 +969,8 @@ int bus_socket_read_message(sd_bus *bus) { bus->rbuffer_size += k; - if (handle_cmsg) { - for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) { + if (handle_cmsg) + for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { int n, *f; @@ -1021,29 +995,9 @@ int bus_socket_read_message(sd_bus *bus) { memcpy(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int)); bus->fds = f; bus->n_fds += n; - } else if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_CREDENTIALS && - cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { - - /* Ignore bogus data, which we might - * get on socketpair() sockets */ - if (((struct ucred*) CMSG_DATA(cmsg))->pid != 0) { - memcpy(&bus->ucred, CMSG_DATA(cmsg), sizeof(struct ucred)); - bus->ucred_valid = true; - } - - } else if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_SECURITY) { - - size_t l; - l = cmsg->cmsg_len - CMSG_LEN(0); - if (l > 0) { - memcpy(&bus->label, CMSG_DATA(cmsg), l); - bus->label[l] = 0; - } - } - } - } + } else + log_debug("Got unexpected auxiliary data with level=%d and type=%d", + cmsg->cmsg_level, cmsg->cmsg_type); r = bus_socket_read_message_need(bus, &need); if (r < 0)