Add tests to support the GTP driver.

Read the selinux-testsuite/tests/gtp/GTP-README for setup details.

Notes: 1) The kernel does not pass back errors on delete link. Need to check audit log for deny gtp { del }. 2) The kernel or the libgtpnl library does not pass back errors on gtp { get }. Seems to be bug or as designed !!. Check audit log for deny.

Signed-off-by: Richard Haines richard_c_haines@btinternet.com --- defconfig | 4 + policy/Makefile | 5 + policy/test_gtp.cil | 18 + policy/test_gtp.te | 96 +++++ tests/Makefile | 4 + tests/gtp/.gitignore | 2 + tests/gtp/GTP-README | 123 ++++++ tests/gtp/Makefile | 8 + ...tpnl-for-SELinux-testsuite-GTP-tests.patch | 366 ++++++++++++++++++ tests/gtp/gtp-link.c | 134 +++++++ tests/gtp/gtp-tunnel.c | 263 +++++++++++++ tests/gtp/test | 169 ++++++++ 12 files changed, 1192 insertions(+) create mode 100644 policy/test_gtp.cil create mode 100644 policy/test_gtp.te create mode 100644 tests/gtp/.gitignore create mode 100644 tests/gtp/GTP-README create mode 100644 tests/gtp/Makefile create mode 100644 tests/gtp/Update-libgtpnl-for-SELinux-testsuite-GTP-tests.patch create mode 100644 tests/gtp/gtp-link.c create mode 100644 tests/gtp/gtp-tunnel.c create mode 100755 tests/gtp/test

diff --git a/defconfig b/defconfig index 46eb673..7b82f19 100644 --- a/defconfig +++ b/defconfig @@ -117,3 +117,7 @@ CONFIG_VFAT_FS=m # They are not required for SELinux operation itself. CONFIG_WATCH_QUEUE=y CONFIG_KEY_NOTIFICATIONS=y + +# GTP module. +# This is not required for SELinux operation itself. +CONFIG_GTP=y diff --git a/policy/Makefile b/policy/Makefile index 6c49091..01aa63f 100644 --- a/policy/Makefile +++ b/policy/Makefile @@ -144,6 +144,11 @@ endif endif endif

+ifeq ($(shell test -e /usr/local/include/libgtpnl/gtpnl.h && echo true),true) +TARGETS += test_gtp.te +CIL_TARGETS += test_gtp.cil +endif + ifeq (x$(DISTRO),$(filter x$(DISTRO),xRHEL4 xRHEL5 xRHEL6)) TARGETS:=$(filter-out test_overlayfs.te test_mqueue.te test_ibpkey.te, $(TARGETS)) endif diff --git a/policy/test_gtp.cil b/policy/test_gtp.cil new file mode 100644 index 0000000..057bcf2 --- /dev/null +++ b/policy/test_gtp.cil @@ -0,0 +1,18 @@ +(class gtp (add del get)) +(classorder (unordered gtp)) + +(allow test_gtp-1_t self (gtp(add del get))) +(allow test_gtp-2_t self (gtp(add del get))) +(allow test_gtp-3_t self (gtp(add del get))) + +(allow test_gtp_no_add_pdp_t test_gtp-1_t (gtp(del get))) +(allow test_gtp_no_del_pdp_t test_gtp-1_t (gtp(add get))) +(allow test_gtp_no_get_pdp_dump_t test_gtp-1_t (gtp(add del))) +(allow test_gtp_no_get_pdp_match_t test_gtp-1_t (gtp(add del))) + +;; Deny gtp for del_link +(allow test_gtp_no_del_link_t self (gtp (add))) +(allow test_gtp-1_t test_gtp_no_del_link_t (gtp (del))) + +;; Allow link to be deleted +(allow test_gtp_no_add_link_t self (gtp (del))) diff --git a/policy/test_gtp.te b/policy/test_gtp.te new file mode 100644 index 0000000..611d972 --- /dev/null +++ b/policy/test_gtp.te @@ -0,0 +1,96 @@ +# +########### Test GTP device driver support ############## +# +attribute gtpdomain; + +# For CONFIG_GTP=m +kernel_request_load_module(gtpdomain) + +################## Create gtp-1 domain ###################### +type test_gtp-1_t; +domain_type(test_gtp-1_t) +unconfined_runs_test(test_gtp-1_t) +typeattribute test_gtp-1_t testdomain; +typeattribute test_gtp-1_t gtpdomain; + +################## Create gtp-2 domain ###################### +type test_gtp-2_t; +domain_type(test_gtp-2_t) +unconfined_runs_test(test_gtp-2_t) +typeattribute test_gtp-2_t testdomain; +typeattribute test_gtp-2_t gtpdomain; + +################## Create gtp-3 domain ###################### +type test_gtp-3_t; +domain_type(test_gtp-3_t) +unconfined_runs_test(test_gtp-3_t) +typeattribute test_gtp-3_t testdomain; +typeattribute test_gtp-3_t gtpdomain; + +# Common gtp rules: +allow gtpdomain self:capability { net_admin }; +allow gtpdomain self:netlink_generic_socket *; +allow gtpdomain self:netlink_route_socket *; +allow gtpdomain self:udp_socket *; +allow gtpdomain test_file_t:dir read; +allow gtpdomain user_home_t:file { execute getattr open read }; +corecmd_check_exec_shell(gtpdomain) +corecmd_exec_bin(gtpdomain) +corecmd_mmap_bin_files(gtpdomain) +corecmd_shell_entry_type(gtpdomain) +corenet_udp_bind_generic_node(gtpdomain) +corenet_udp_bind_generic_port(gtpdomain) +kernel_read_network_state(gtpdomain) +miscfiles_exec_test_files(gtpdomain) +userdom_list_user_home_dirs(gtpdomain) +userdom_manage_user_home_content_dirs(gtpdomain) +userdom_map_user_home_files(gtpdomain) +userdom_read_user_home_content_symlinks(gtpdomain) + +####################### Deny gtp { add_link } ########################## +type test_gtp_no_add_link_t; +domain_type(test_gtp_no_add_link_t) +unconfined_runs_test(test_gtp_no_add_link_t) +typeattribute test_gtp_no_add_link_t testdomain; +typeattribute test_gtp_no_add_link_t gtpdomain; + +####################### Deny gtp { del_link } ########################## +type test_gtp_no_del_link_t; +domain_type(test_gtp_no_del_link_t) +unconfined_runs_test(test_gtp_no_del_link_t) +typeattribute test_gtp_no_del_link_t testdomain; +typeattribute test_gtp_no_del_link_t gtpdomain; + +################## Deny gtp { add_pdp } ######################## +type test_gtp_no_add_pdp_t; +domain_type(test_gtp_no_add_pdp_t) +unconfined_runs_test(test_gtp_no_add_pdp_t) +typeattribute test_gtp_no_add_pdp_t testdomain; +typeattribute test_gtp_no_add_pdp_t gtpdomain; + +################## Deny gtp { del_pdp } ######################## +type test_gtp_no_del_pdp_t; +domain_type(test_gtp_no_del_pdp_t) +unconfined_runs_test(test_gtp_no_del_pdp_t) +typeattribute test_gtp_no_del_pdp_t testdomain; +typeattribute test_gtp_no_del_pdp_t gtpdomain; + +################## Deny gtp { get_pdp } ######################## +type test_gtp_no_get_pdp_dump_t; +domain_type(test_gtp_no_get_pdp_dump_t) +unconfined_runs_test(test_gtp_no_get_pdp_dump_t) +typeattribute test_gtp_no_get_pdp_dump_t testdomain; +typeattribute test_gtp_no_get_pdp_dump_t gtpdomain; + +################## Deny gtp { get_pdp } ######################## +type test_gtp_no_get_pdp_match_t; +domain_type(test_gtp_no_get_pdp_match_t) +unconfined_runs_test(test_gtp_no_get_pdp_match_t) +typeattribute test_gtp_no_get_pdp_match_t testdomain; +typeattribute test_gtp_no_get_pdp_match_t gtpdomain; + +# +########### Allow these domains to be entered from sysadm domain ############ +# +miscfiles_domain_entry_test_files(gtpdomain) +userdom_sysadm_entry_spec_domtrans_to(gtpdomain) diff --git a/tests/Makefile b/tests/Makefile index 001639b..968f68a 100644 --- a/tests/Makefile +++ b/tests/Makefile @@ -129,6 +129,10 @@ SUBDIRS += watchkey endif endif

+ifeq ($(shell test -e /usr/local/include/libgtpnl/gtpnl.h && echo true),true) +SUBDIRS += gtp +endif + ifeq ($(DISTRO),RHEL4) SUBDIRS:=$(filter-out bounds dyntrace dyntrans inet_socket mmap nnp_nosuid overlay unix_socket, $(SUBDIRS)) endif diff --git a/tests/gtp/.gitignore b/tests/gtp/.gitignore new file mode 100644 index 0000000..decdf8a --- /dev/null +++ b/tests/gtp/.gitignore @@ -0,0 +1,2 @@ +gtp-link +gtp-tunnel diff --git a/tests/gtp/GTP-README b/tests/gtp/GTP-README new file mode 100644 index 0000000..35a4ace --- /dev/null +++ b/tests/gtp/GTP-README @@ -0,0 +1,123 @@ +Testing LSM/SELinux GTP Kernel Hooks +==================================== + +These tests were performed on Fedora 32 Workstation with the 'targeted' policy +using an updated kernel with the GTP RFC kernel patches. + +The basic process is: +1) Build kernel with RFC LSM/GTP/SELinux patches (use the + selinux-testsuite/defconfig file to set correct config if required). +2) Setup the selinux-testsuite and add the GTP test patch. +3) Build/install the libgtpnl library using a patch from the selinux-testsuite + as this will allow errors to be returned by the library functions. +4) Build/run selinux-testsuite for all SELinux tests (sets up the environment). +5) Run the GTP tests locally to see more info. +6) Remove the selinux-testsuite policy. + +# +#### Start ##### +# + +Build and install a kernel with the "Add LSM/SELinux support for GPRS +Tunneling Protocol (GTP)" patch set, [1] was used for these tests. + +NOTE: The selinux-testsuite/defconfig file contains kernel config info to +build a suitable kernel. See selinux-testsuite/README.md + +Make a test build directory e.g.: +mkdir /home/GTP-TEST + +# +#### Setup SELinux-testsuite ###### +# +cd /home/GTP-TEST +git clone https://github.com/SELinuxProject/selinux-testsuite.git +cd selinux-testsuite + +Install the testsuite RFC GTP Patch: "selinux-testsuite: Add GTP tests" + +This will add the GTP tests. There will be in selinux-testsuite/tests/gtp: +1) GTP-README - These install/build/run instructions. +2) Update-libgtpnl-for-SELinux-testsuite-GTP-tests.patch - This contains + changes required to return ERRNO and add gtp_match_tunnel function to + the libgtpnl library and tools. +3) gtp-link.c and gtp-tunnel.c - These are the modified files from + libgtpnl/tools as the local Makefile will build these. +4) test - A perl test script. + +# +##### Setup and build/install the libgtpnl library ###### +# +Note: The install process will install the library and include files by +default in /usr/local/..): +cd /home/GTP-TEST +git clone git://git.osmocom.org/libgtpnl.git +cd libgtpnl +patch -p1 < ../selinux-testsuite/tests/gtp/Update-libgtpnl-for-SELinux-testsuite-GTP-tests.patch +autoreconf -fi && ./configure && make && make install + +Now build and run the SELinux-testsuite: +cd /home/GTP-TEST/selinux-testsuite +setenforce 1 +make test + +If there is a build error it is most likely to be the 'module_load' test that +requires the kernel version devel to be installed. If it is not then comment +out the test in tests/Makefile. + +All other tests should run correctly. The GTP test will be last and there +should be one error reported: + +# Failed test 'FIXME: Fails gtp_list_tunnel() as no callback error. +Audit log should have: allow test_gtp_no_get_pdp_dump_t test_gtp_t:gtp get;' +# at gtp/test line 76. + +This happens because the kernel/netlink does not return an error when +'gtp-tunnel list' is called and the permission is denied, however the audit.log +indicates the denial. Any idea for a fix ??. Tried various kernel/netlink +changes to no avail. Netlink documentation seems to imply that it should work. + +To run the GTP tests locally and see more information: + +cd tests/gtp +# Clear audit log file: +> /var/log/audit/audit.log +# Run tests showing extra info: +./test +# Check audit log for denials: +audit2allow -p /etc/selinux/targeted/policy/policy.32 < /var/log/audit/audit.log + +The output should consist of the following entries: +#============= test_gtp-2_t ============== +allow test_gtp-2_t test_gtp-1_t:gtp { del get }; + +#============= test_gtp_no_add_link_t ============== +allow test_gtp_no_add_link_t self:gtp add; + +#============= test_gtp_no_add_pdp_t ============== +allow test_gtp_no_add_pdp_t test_gtp-1_t:gtp add; + +#============= test_gtp_no_del_link_t ============== +allow test_gtp_no_del_link_t self:gtp del; + +#============= test_gtp_no_del_pdp_t ============== +allow test_gtp_no_del_pdp_t test_gtp-1_t:gtp del; + +#============= test_gtp_no_get_pdp_dump_t ============== +allow test_gtp_no_get_pdp_dump_t test_gtp-1_t:gtp get; + +#============= test_gtp_no_get_pdp_match_t ============== +allow test_gtp_no_get_pdp_match_t test_gtp-1_t:gtp get; + + +IMPORTANT: Remove the selinux-testsuite test policy when finished as it will +stop any libgtpnl functions from working in other SELinux domains: + +cd /home/GTP-TEST/selinux-testsuite +make -C policy unload + +libgtpnl functions should now work in any domain. + +The End + +[1] https://github.com/SELinuxProject/selinux-kernel diff --git a/tests/gtp/Makefile b/tests/gtp/Makefile new file mode 100644 index 0000000..5adc426 --- /dev/null +++ b/tests/gtp/Makefile @@ -0,0 +1,8 @@ +TARGETS = gtp-link gtp-tunnel +CFLAGS ?= -Wall +LDLIBS += -l mnl -lgtpnl + +all: $(TARGETS) + +clean: + rm -f $(TARGETS) diff --git a/tests/gtp/Update-libgtpnl-for-SELinux-testsuite-GTP-tests.patch b/tests/gtp/Update-libgtpnl-for-SELinux-testsuite-GTP-tests.patch new file mode 100644 index 0000000..3baef1c --- /dev/null +++ b/tests/gtp/Update-libgtpnl-for-SELinux-testsuite-GTP-tests.patch @@ -0,0 +1,366 @@ +libgtpnl: Allow SELinux-testsuite to run tests on GTP + +This allows the GTP functions to return errno when running +test so that EACCES can be detected. + +Added 'gtp-tunnel match <device> <ver> <tid>' for testing +permissions. + +Added to gtp-link options to pass port numbers when adding device in +the same namespace. + +NOTE: gtp_list_tunnel() does not return an error when pdp_get denied. +Could not find reason for this. gtp_match_tunnel() does return error +when pdp_get denied. + +--- + include/libgtpnl/gtpnl.h | 1 + + src/gtp-genl.c | 47 +++++++++++++++++++++++++---- + src/libgtpnl.map | 1 + + tools/gtp-link.c | 37 ++++++++++++++++++----- + tools/gtp-tunnel.c | 64 +++++++++++++++++++++++++++++++++++----- + 5 files changed, 130 insertions(+), 20 deletions(-) + +diff --git a/include/libgtpnl/gtpnl.h b/include/libgtpnl/gtpnl.h +index 6cd9f46..1bc427d 100644 +--- a/include/libgtpnl/gtpnl.h ++++ b/include/libgtpnl/gtpnl.h +@@ -27,5 +27,6 @@ struct gtp_tunnel; + int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t); + int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t); + int gtp_list_tunnel(int genl_id, struct mnl_socket *nl); ++int gtp_match_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t); + + #endif +diff --git a/src/gtp-genl.c b/src/gtp-genl.c +index f12f872..fe24625 100644 +--- a/src/gtp-genl.c ++++ b/src/gtp-genl.c +@@ -25,6 +25,7 @@ + #include <string.h> + #include <unistd.h> + #include <time.h> ++#include <errno.h> + #include <arpa/inet.h> + #include <sys/socket.h> + #include <netinet/in.h> +@@ -66,6 +67,7 @@ int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t) + struct nlmsghdr *nlh; + char buf[MNL_SOCKET_BUFFER_SIZE]; + uint32_t seq = time(NULL); ++ int ret; + + if (t->gtp_version > GTP_V1) { + fprintf(stderr, "wrong GTP version %u, use v0 or v1\n", +@@ -77,8 +79,12 @@ int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t) + GTP_CMD_NEWPDP); + gtp_build_payload(nlh, t); + +- if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0) ++ ret = genl_socket_talk(nl, nlh, seq, NULL, NULL); ++ if (ret < 0) { ++ ret = errno; + perror("genl_socket_talk"); ++ return ret; ++ } + + return 0; + } +@@ -89,13 +95,19 @@ int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t) + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + uint32_t seq = time(NULL); ++ int ret; + + nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_ACK, ++seq, + GTP_CMD_DELPDP); + gtp_build_payload(nlh, t); + +- if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0) ++ ret = genl_socket_talk(nl, nlh, seq, NULL, NULL); ++ /* Kernel void gtp_dellink() does not pass errors back to userspace */ ++ if (ret < 0) { ++ ret = errno; + perror("genl_socket_talk"); ++ return ret; ++ } + + return 0; + } +@@ -194,15 +206,40 @@ int gtp_list_tunnel(int genl_id, struct mnl_socket *nl) + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + uint32_t seq = time(NULL); ++ int ret; + +- nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_DUMP, 0, ++ nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_DUMP | NLM_F_ACK, ++seq, + GTP_CMD_GETPDP); + +- if (genl_socket_talk(nl, nlh, seq, genl_gtp_attr_cb, NULL) < 0) { ++ ret = genl_socket_talk(nl, nlh, seq, genl_gtp_attr_cb, NULL); ++ if (ret < 0) { ++ ret = errno; + perror("genl_socket_talk"); +- return 0; ++ return ret; + } + + return 0; + } + EXPORT_SYMBOL(gtp_list_tunnel); ++ ++int gtp_match_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t) ++{ ++ char buf[MNL_SOCKET_BUFFER_SIZE]; ++ struct nlmsghdr *nlh; ++ uint32_t seq = time(NULL); ++ int ret; ++ ++ nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_MATCH | NLM_F_ACK, ++seq, ++ GTP_CMD_GETPDP); ++ gtp_build_payload(nlh, t); ++ ++ ret = genl_socket_talk(nl, nlh, seq, genl_gtp_attr_cb, NULL); ++ if (ret < 0) { ++ ret = errno; ++ perror("genl_socket_talk"); ++ return ret; ++ } ++ ++ return 0; ++} ++EXPORT_SYMBOL(gtp_match_tunnel); +diff --git a/src/libgtpnl.map b/src/libgtpnl.map +index 804f8b3..4556758 100644 +--- a/src/libgtpnl.map ++++ b/src/libgtpnl.map +@@ -14,6 +14,7 @@ global: + gtp_add_tunnel; + gtp_del_tunnel; + gtp_list_tunnel; ++ gtp_match_tunnel; + + gtp_tunnel_alloc; + gtp_tunnel_free; +diff --git a/tools/gtp-link.c b/tools/gtp-link.c +index 8367c6e..e88e349 100644 +--- a/tools/gtp-link.c ++++ b/tools/gtp-link.c +@@ -27,6 +27,7 @@ + #include <unistd.h> + #include <string.h> + #include <time.h> ++#include <errno.h> + #include <netinet/in.h> + #include <arpa/inet.h> + +@@ -44,35 +45,53 @@ int main(int argc, char *argv[]) + { + char buf[MNL_SOCKET_BUFFER_SIZE]; + int ret, sgsn_mode = 0; ++ int port1, port2; + + if (argc < 3) { +- printf("Usage: %s <add|del> <device>\n", argv[0]); ++ printf("Usage: %s <add|del> <device> [--sgsn] [port1] [port2]\n", ++ argv[0]); + exit(EXIT_FAILURE); + } + + if (!strcmp(argv[1], "del")) { + printf("destroying gtp interface...\n"); +- if (gtp_dev_destroy(argv[2]) < 0) ++ ++ ret = gtp_dev_destroy(argv[2]); ++ /* Kernel gtp_dellink() does not pass errors back to userspace */ ++ if (ret < 0) { ++ ret = errno; + perror("gtp_dev_destroy"); ++ } + +- return 0; ++ return ret; + } + +- if (argc > 3 && !strcmp(argv[3], "--sgsn")) ++ port1 = 3386; ++ port2 = 2152; ++ ++ if (argc > 3 && !strcmp(argv[3], "--sgsn")) { + sgsn_mode = 1; ++ if (argc == 6) { ++ port1 = atoi(argv[4]); ++ port2 = atoi(argv[5]); ++ } ++ } else if (argc == 5) { ++ port1 = atoi(argv[3]); ++ port2 = atoi(argv[4]); ++ } + + int fd1 = socket(AF_INET, SOCK_DGRAM, 0); + int fd2 = socket(AF_INET, SOCK_DGRAM, 0); + struct sockaddr_in sockaddr_fd1 = { + .sin_family = AF_INET, +- .sin_port = htons(3386), ++ .sin_port = htons(port1), + .sin_addr = { + .s_addr = INADDR_ANY, + }, + }; + struct sockaddr_in sockaddr_fd2 = { + .sin_family = AF_INET, +- .sin_port = htons(2152), ++ .sin_port = htons(port2), + .sin_addr = { + .s_addr = INADDR_ANY, + }, +@@ -94,13 +113,15 @@ int main(int argc, char *argv[]) + else + ret = gtp_dev_create(-1, argv[2], fd1, fd2); + if (ret < 0) { +- perror("cannot create GTP device\n"); +- exit(EXIT_FAILURE); ++ ret = errno; ++ perror("cannot create GTP device"); ++ return ret; + } + + fprintf(stderr, "WARNING: attaching dummy socket descriptors. Keep " + "this process running for testing purposes.\n"); + ++ + while (1) { + struct sockaddr_in addr; + socklen_t len = sizeof(addr); +diff --git a/tools/gtp-tunnel.c b/tools/gtp-tunnel.c +index 513ff4a..8fb7fa2 100644 +--- a/tools/gtp-tunnel.c ++++ b/tools/gtp-tunnel.c +@@ -27,6 +27,7 @@ + #include <string.h> + #include <unistd.h> + #include <time.h> ++ + #include <arpa/inet.h> + #include <sys/socket.h> + #include <netinet/in.h> +@@ -56,7 +57,7 @@ add_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) + uint32_t gtp_ifidx; + struct in_addr ms, sgsn; + uint32_t gtp_version; +- int optidx; ++ int optidx, ret; + + if (argc < 7 || argc > 8) { + add_usage(argv[0]); +@@ -107,10 +108,11 @@ add_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) + } + gtp_tunnel_set_sgsn_ip4(t, &sgsn); + +- gtp_add_tunnel(genl_id, nl, t); ++ /* Returns 0 or errno */ ++ ret = gtp_add_tunnel(genl_id, nl, t); + + gtp_tunnel_free(t); +- return 0; ++ return ret; + } + + static int +@@ -118,6 +120,7 @@ del_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) + { + struct gtp_tunnel *t; + uint32_t gtp_ifidx; ++ int ret; + + if (argc != 5) { + printf("%s add <gtp device> <version> <tid>\n", +@@ -146,10 +149,11 @@ del_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) + return EXIT_FAILURE; + } + +- gtp_del_tunnel(genl_id, nl, t); ++ /* Returns 0 or errno */ ++ ret = gtp_del_tunnel(genl_id, nl, t); + + gtp_tunnel_free(t); +- return 0; ++ return ret; + } + + struct gtp_pdp { +@@ -170,7 +174,51 @@ struct gtp_pdp { + static int + list_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) + { +- return gtp_list_tunnel(genl_id, nl); ++ int ret; ++ ++ ret = gtp_list_tunnel(genl_id, nl); ++ return ret; ++} ++ ++static int ++match_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) ++{ ++ struct gtp_tunnel *t; ++ uint32_t gtp_ifidx; ++ int ret; ++ ++ if (argc != 5) { ++ printf("%s match <gtp device> <version> <tid>\n", ++ argv[0]); ++ return EXIT_FAILURE; ++ } ++ ++ t = gtp_tunnel_alloc(); ++ ++ gtp_ifidx = if_nametoindex(argv[2]); ++ if (gtp_ifidx == 0) { ++ fprintf(stderr, "wrong GTP interface %s\n", argv[2]); ++ return EXIT_FAILURE; ++ } ++ gtp_tunnel_set_ifidx(t, gtp_ifidx); ++ ++ if (strcmp(argv[3], "v0") == 0) { ++ gtp_tunnel_set_version(t, GTP_V0); ++ gtp_tunnel_set_tid(t, atoi(argv[4])); ++ } else if (strcmp(argv[3], "v1") == 0) { ++ gtp_tunnel_set_version(t, GTP_V1); ++ gtp_tunnel_set_i_tei(t, atoi(argv[4])); ++ } else { ++ fprintf(stderr, "wrong GTP version %s, use v0 or v1\n", ++ argv[3]); ++ return EXIT_FAILURE; ++ } ++ ++ /* Returns 0 or errno */ ++ ret = gtp_match_tunnel(genl_id, nl, t); ++ ++ gtp_tunnel_free(t); ++ return ret; + } + + int main(int argc, char *argv[]) +@@ -180,7 +228,7 @@ int main(int argc, char *argv[]) + int ret; + + if (argc < 2) { +- printf("%s <add|delete|list> [<options,...>]\n", argv[0]); ++ printf("%s <add|delete|list|match> [<options,...>]\n", argv[0]); + exit(EXIT_FAILURE); + } + +@@ -202,6 +250,8 @@ int main(int argc, char *argv[]) + ret = del_tunnel(argc, argv, genl_id, nl); + else if (strncmp(argv[1], "list", strlen(argv[1])) == 0) + ret = list_tunnel(argc, argv, genl_id, nl); ++ else if (strncmp(argv[1], "match", strlen(argv[1])) == 0) ++ ret = match_tunnel(argc, argv, genl_id, nl); + else { + printf("Unknown command `%s'\n", argv[1]); + exit(EXIT_FAILURE); +-- +2.26.2 + diff --git a/tests/gtp/gtp-link.c b/tests/gtp/gtp-link.c new file mode 100644 index 0000000..c94a75b --- /dev/null +++ b/tests/gtp/gtp-link.c @@ -0,0 +1,134 @@ +/* Command line utility to create GTP link */ + +/* (C) 2014 by sysmocom - s.f.m.c. GmbH + * (C) 2016 by Pablo Neira Ayuso pablo@netfilter.org + * + * Author: Pablo Neira Ayuso pablo@gnumonks.org + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see http://www.gnu.org/licenses/. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <time.h> +#include <errno.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <libmnl/libmnl.h> +#include <linux/if.h> +#include <linux/if_link.h> +#include <linux/rtnetlink.h> + +#include <linux/gtp.h> +#include <linux/if_link.h> + +#include <libgtpnl/gtpnl.h> + +int main(int argc, char *argv[]) +{ + char buf[MNL_SOCKET_BUFFER_SIZE]; + int ret, sgsn_mode = 0; + int port1, port2; + + if (argc < 3) { + printf("Usage: %s <add|del> <device> [--sgsn] [port1] [port2]\n", + argv[0]); + exit(EXIT_FAILURE); + } + + if (!strcmp(argv[1], "del")) { + printf("destroying gtp interface...\n"); + + ret = gtp_dev_destroy(argv[2]); + /* Kernel gtp_dellink() does not pass errors back to userspace */ + if (ret < 0) { + ret = errno; + perror("gtp_dev_destroy"); + } + + return ret; + } + + port1 = 3386; + port2 = 2152; + + if (argc > 3 && !strcmp(argv[3], "--sgsn")) { + sgsn_mode = 1; + if (argc == 6) { + port1 = atoi(argv[4]); + port2 = atoi(argv[5]); + } + } else if (argc == 5) { + port1 = atoi(argv[3]); + port2 = atoi(argv[4]); + } + + int fd1 = socket(AF_INET, SOCK_DGRAM, 0); + int fd2 = socket(AF_INET, SOCK_DGRAM, 0); + struct sockaddr_in sockaddr_fd1 = { + .sin_family = AF_INET, + .sin_port = htons(port1), + .sin_addr = { + .s_addr = INADDR_ANY, + }, + }; + struct sockaddr_in sockaddr_fd2 = { + .sin_family = AF_INET, + .sin_port = htons(port2), + .sin_addr = { + .s_addr = INADDR_ANY, + }, + }; + + if (bind(fd1, (struct sockaddr *) &sockaddr_fd1, + sizeof(sockaddr_fd1)) < 0) { + perror("bind"); + exit(EXIT_FAILURE); + } + if (bind(fd2, (struct sockaddr *) &sockaddr_fd2, + sizeof(sockaddr_fd2)) < 0) { + perror("bind"); + exit(EXIT_FAILURE); + } + + if (sgsn_mode) + ret = gtp_dev_create_sgsn(-1, argv[2], fd1, fd2); + else + ret = gtp_dev_create(-1, argv[2], fd1, fd2); + if (ret < 0) { + ret = errno; + perror("cannot create GTP device"); + return ret; + } + + fprintf(stderr, "WARNING: attaching dummy socket descriptors. Keep " + "this process running for testing purposes.\n"); + + while (1) { + struct sockaddr_in addr; + socklen_t len = sizeof(addr); + + ret = recvfrom(fd1, buf, sizeof(buf), 0, + (struct sockaddr *)&addr, &len); + printf("received %d bytes via UDP socket\n", ret); + } + + return 0; +} diff --git a/tests/gtp/gtp-tunnel.c b/tests/gtp/gtp-tunnel.c new file mode 100644 index 0000000..6079028 --- /dev/null +++ b/tests/gtp/gtp-tunnel.c @@ -0,0 +1,263 @@ +/* Command line utility to create GTP tunnels (PDP contexts) */ + +/* (C) 2014 by sysmocom - s.f.m.c. GmbH + * (C) 2016 by Pablo Neira Ayuso pablo@netfilter.org + * + * Author: Pablo Neira Ayuso pablo@gnumonks.org + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see http://www.gnu.org/licenses/. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <time.h> + +#include <arpa/inet.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <net/if.h> +#include <inttypes.h> + +#include <libmnl/libmnl.h> +#include <linux/genetlink.h> + +#include <linux/gtp.h> +#include <linux/if_link.h> +#include <libgtpnl/gtp.h> +#include <libgtpnl/gtpnl.h> + +static void add_usage(const char *name) +{ + printf("%s add <gtp device> <v0> <tid> <ms-addr> <sgsn-addr>\n", + name); + printf("%s add <gtp device> <v1> <i_tei> <o_tei> <ms-addr> <sgsn-addr>\n", + name); +} + +static int +add_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) +{ + struct gtp_tunnel *t; + uint32_t gtp_ifidx; + struct in_addr ms, sgsn; + uint32_t gtp_version; + int optidx, ret; + + if (argc < 7 || argc > 8) { + add_usage(argv[0]); + return EXIT_FAILURE; + } + + t = gtp_tunnel_alloc(); + optidx = 2; + + gtp_ifidx = if_nametoindex(argv[optidx]); + if (gtp_ifidx == 0) { + fprintf(stderr, "wrong GTP interface %s\n", argv[optidx]); + return EXIT_FAILURE; + } + gtp_tunnel_set_ifidx(t, gtp_ifidx); + + optidx++; + + if (strcmp(argv[optidx], "v0") == 0) + gtp_version = GTP_V0; + else if (strcmp(argv[optidx], "v1") == 0) + gtp_version = GTP_V1; + else { + fprintf(stderr, "wrong GTP version %s, use v0 or v1\n", + argv[optidx]); + return EXIT_FAILURE; + } + gtp_tunnel_set_version(t, gtp_version); + + optidx++; + + if (gtp_version == GTP_V0) + gtp_tunnel_set_tid(t, atoi(argv[optidx++])); + else if (gtp_version == GTP_V1) { + gtp_tunnel_set_i_tei(t, atoi(argv[optidx++])); + gtp_tunnel_set_o_tei(t, atoi(argv[optidx++])); + } + + if (inet_aton(argv[optidx++], &ms) < 0) { + perror("bad address for ms"); + exit(EXIT_FAILURE); + } + gtp_tunnel_set_ms_ip4(t, &ms); + + if (inet_aton(argv[optidx++], &sgsn) < 0) { + perror("bad address for sgsn"); + exit(EXIT_FAILURE); + } + gtp_tunnel_set_sgsn_ip4(t, &sgsn); + + /* Returns 0 or errno */ + ret = gtp_add_tunnel(genl_id, nl, t); + + gtp_tunnel_free(t); + return ret; +} + +static int +del_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) +{ + struct gtp_tunnel *t; + uint32_t gtp_ifidx; + int ret; + + if (argc != 5) { + printf("%s add <gtp device> <version> <tid>\n", + argv[0]); + return EXIT_FAILURE; + } + + t = gtp_tunnel_alloc(); + + gtp_ifidx = if_nametoindex(argv[2]); + if (gtp_ifidx == 0) { + fprintf(stderr, "wrong GTP interface %s\n", argv[2]); + return EXIT_FAILURE; + } + gtp_tunnel_set_ifidx(t, gtp_ifidx); + + if (strcmp(argv[3], "v0") == 0) { + gtp_tunnel_set_version(t, GTP_V0); + gtp_tunnel_set_tid(t, atoi(argv[4])); + } else if (strcmp(argv[3], "v1") == 0) { + gtp_tunnel_set_version(t, GTP_V1); + gtp_tunnel_set_i_tei(t, atoi(argv[4])); + } else { + fprintf(stderr, "wrong GTP version %s, use v0 or v1\n", + argv[3]); + return EXIT_FAILURE; + } + + /* Returns 0 or errno */ + ret = gtp_del_tunnel(genl_id, nl, t); + + gtp_tunnel_free(t); + return ret; +} + +struct gtp_pdp { + uint32_t version; + union { + struct { + uint64_t tid; + } v0; + struct { + uint32_t i_tei; + uint32_t o_tei; + } v1; + } u; + struct in_addr sgsn_addr; + struct in_addr ms_addr; +}; + +static int +list_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) +{ + int ret; + + ret = gtp_list_tunnel(genl_id, nl); + return ret; +} + +static int +match_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl) +{ + struct gtp_tunnel *t; + uint32_t gtp_ifidx; + int ret; + + if (argc != 5) { + printf("%s match <gtp device> <version> <tid>\n", + argv[0]); + return EXIT_FAILURE; + } + + t = gtp_tunnel_alloc(); + + gtp_ifidx = if_nametoindex(argv[2]); + if (gtp_ifidx == 0) { + fprintf(stderr, "wrong GTP interface %s\n", argv[2]); + return EXIT_FAILURE; + } + gtp_tunnel_set_ifidx(t, gtp_ifidx); + + if (strcmp(argv[3], "v0") == 0) { + gtp_tunnel_set_version(t, GTP_V0); + gtp_tunnel_set_tid(t, atoi(argv[4])); + } else if (strcmp(argv[3], "v1") == 0) { + gtp_tunnel_set_version(t, GTP_V1); + gtp_tunnel_set_i_tei(t, atoi(argv[4])); + } else { + fprintf(stderr, "wrong GTP version %s, use v0 or v1\n", + argv[3]); + return EXIT_FAILURE; + } + + /* Returns 0 or errno */ + ret = gtp_match_tunnel(genl_id, nl, t); + + gtp_tunnel_free(t); + return ret; +} + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + int32_t genl_id; + int ret; + + if (argc < 2) { + printf("%s <add|delete|list|match> [<options,...>]\n", argv[0]); + exit(EXIT_FAILURE); + } + + nl = genl_socket_open(); + if (nl == NULL) { + perror("mnl_socket_open"); + exit(EXIT_FAILURE); + } + + genl_id = genl_lookup_family(nl, "gtp"); + if (genl_id < 0) { + printf("not found gtp genl family\n"); + exit(EXIT_FAILURE); + } + + if (strncmp(argv[1], "add", strlen(argv[1])) == 0) + ret = add_tunnel(argc, argv, genl_id, nl); + else if (strncmp(argv[1], "delete", strlen(argv[1])) == 0) + ret = del_tunnel(argc, argv, genl_id, nl); + else if (strncmp(argv[1], "list", strlen(argv[1])) == 0) + ret = list_tunnel(argc, argv, genl_id, nl); + else if (strncmp(argv[1], "match", strlen(argv[1])) == 0) + ret = match_tunnel(argc, argv, genl_id, nl); + else { + printf("Unknown command `%s'\n", argv[1]); + exit(EXIT_FAILURE); + } + + mnl_socket_close(nl); + + return ret; +} diff --git a/tests/gtp/test b/tests/gtp/test new file mode 100755 index 0000000..cff8eab --- /dev/null +++ b/tests/gtp/test @@ -0,0 +1,169 @@ +#!/usr/bin/perl +use Test::More; + +BEGIN { + $basedir = $0; + $basedir =~ s|(.*)/[^/]*|$1|; + + plan tests => 20; +} + +sub add_link { + my ( $runcon_args, $args ) = @_; + my $pid; + + if ( ( $pid = fork() ) == 0 ) { + exec "runcon $runcon_args $basedir/gtp-link $args"; + } + + # Wait for it to initialize. + sleep 1; + return $pid; +} + +sub del_link { + my ($pid) = @_; + + kill KILL, $pid; + waitpid $pid, 0; +} + +############ Basic tests for GTP ############# +print "Test GTP device driver support\n"; +$pid = add_link( "-t test_gtp-1_t", "add gtp-1 2>&1" ); + +print "Test GTP device driver support\n"; +$result = system +"runcon -t test_gtp-1_t $basedir/gtp-tunnel add gtp-1 v1 100 200 127.0.0.1 127.0.0.1"; +ok( $result eq 0 ); + +$result = system +"runcon -t test_gtp-1_t $basedir/gtp-tunnel add gtp-1 v1 200 300 127.0.0.2 127.0.0.2"; +ok( $result eq 0 ); + +$result = system +"runcon -t test_gtp-1_t $basedir/gtp-tunnel add gtp-1 v0 300 127.0.0.3 127.0.0.3"; +ok( $result eq 0 ); + +$result = system "runcon -t test_gtp-1_t $basedir/gtp-tunnel list"; +ok( $result eq 0 ); + +$result = + system "runcon -t test_gtp-1_t $basedir/gtp-tunnel match gtp-1 v1 200"; +ok( $result eq 0 ); + +########### Test Deny permissions #################### +print "Test Deny permissions\n"; + +# Deny gtp { add } - EACCES +$result = system +"runcon -t test_gtp_no_add_pdp_t $basedir/gtp-tunnel add gtp-1 v0 400 127.0.0.4 127.0.0.4 2>&1"; +ok( $result >> 8 eq 13 ); + +# Deny gtp { del } - EACCES +$result = system +"runcon -t test_gtp_no_del_pdp_t $basedir/gtp-tunnel delete gtp-1 v1 100 2>&1"; +ok( $result >> 8 eq 13 ); + +# Deny gtp { get } (gtp-tunnel list) - EACCES +# Test returns 0 not EACCES as gtp_list_tunnel() with NLM_F_DUMP does +# not pass errors back via the gtp-genl.c genl_gtp_attr_cb() callback. +# The documentation found suggests that it should !!!! +# The audit log will show the denial: +# allow test_gtp_no_get_pdp_dump_t test_gtp-1_t:gtp get; +$result = + system "runcon -t test_gtp_no_get_pdp_dump_t $basedir/gtp-tunnel list 2>&1"; +ok( + $result >> 8 eq 13, +"FIXME: Fails gtp_list_tunnel() as no callback error. Audit log should have: allow test_gtp_no_get_pdp_dump_t test_gtp-1_t:gtp get;" +); + +print "Deny gtp { get } (gtp-tunnel match) - EACCES\n"; +$result = + system +"runcon -t test_gtp_no_get_pdp_match_t $basedir/gtp-tunnel match gtp-1 v0 300 2>&1"; +ok( $result >> 8 eq 13 ); + +# Kill the link. +$result = system "runcon -t test_gtp-1_t $basedir/gtp-link del gtp-1"; +ok( $result eq 0 ); +del_link($pid); + +# Add link to test deny gtp delete link +$pid = add_link( "-t test_gtp_no_del_link_t", "add gtp-1 2>&1" ); + +# Test returns 0 not EACCES as kernel void gtp_dellink() does not +# pass errors back to userspace. The audit log should show +# allow test_gtp_no_del_link_t self:gtp del; +$result = + system "runcon -t test_gtp_no_del_link_t $basedir/gtp-link del gtp-1 2>&1"; +ok( + $result eq 0, +"PASS: Kernel void gtp_dellink() does not pass errors back. Audit log should have: allow test_gtp_no_del_link_t self:gtp del;" +); + +# Kill the link. +$result = system "runcon -t test_gtp-1_t $basedir/gtp-link del gtp-1"; +del_link($pid); + +# Deny gtp { add } - EACCES +$result = + system "runcon -t test_gtp_no_add_link_t $basedir/gtp-link add gtp-2 2>&1"; +ok( $result >> 8 eq 13 ); + +# +print +"Create three GTP devices with different security contexts in same namespace\n"; +# +$port1 = "3386"; +$port2 = "2152"; + +$pid1 = add_link( "-t test_gtp-1_t", "add gtp-1 $port1 $port2 2>&1" ); + +$result = system +"runcon -t test_gtp-1_t $basedir/gtp-tunnel add gtp-1 v1 200 100 172.99.0.1 172.0.0.1"; +ok( $result eq 0 ); + +$port1++; +$port2++; +$pid2 = add_link( "-t test_gtp-2_t", "add gtp-2 $port1 $port2 2>&1" ); +$result = system +"runcon -t test_gtp-2_t $basedir/gtp-tunnel add gtp-2 v1 200 100 172.99.0.2 172.0.0.2"; +ok( $result eq 0 ); + +$result = system +"runcon -t test_gtp-2_t $basedir/gtp-tunnel list gtp-2 v1 200 100 172.99.0.2 172.0.0.2"; +ok( $result eq 0 ); + +$result = + system "runcon -t test_gtp-2_t $basedir/gtp-tunnel match gtp-1 v1 200 2>&1"; +ok( $result >> 8 eq 13 ); + +$port1++; +$port2++; +$pid3 = add_link( "-t test_gtp-3_t", "add gtp-3 $port1 $port2 2>&1" ); + +# Use test_gtp-2_t to kill link 1. +$result = system "runcon -t test_gtp-2_t $basedir/gtp-link del gtp-1"; +ok( + $result eq 0, +"PASS: Kernel void gtp_dellink() does not pass errors back. Audit log should have: allow test_gtp-2_t test_gtp-1_t:gtp del;" +); +del_link($pid1); + +# Kill link 1. +$result = system "runcon -t test_gtp-1_t $basedir/gtp-link del gtp-1"; +ok( $result eq 0 ); +del_link($pid1); + +# Kill link 2. +$result = system "runcon -t test_gtp-2_t $basedir/gtp-link del gtp-2"; +ok( $result eq 0 ); +del_link($pid2); + +# Kill link 3. +$result = system "runcon -t test_gtp-3_t $basedir/gtp-link del gtp-3"; +ok( $result eq 0 ); +del_link($pid3); + +exit;