1 // Tests of SCTP functionality 2 // Requires: libsctp-dev package on Debian Linux, CONFIG_IP_SCTP in kernel config 3 #include <sys/types.h> 4 #include <sys/socket.h> 5 #include <netinet/in.h> 6 #include <netinet/sctp.h> 7 #include <arpa/inet.h> 8 #include <stdio.h> 9 10 #include "syscalls.h" 11 #include "capsicum.h" 12 #include "capsicum-test.h" 13 14 static cap_rights_t r_ro; 15 static cap_rights_t r_wo; 16 static cap_rights_t r_rw; 17 static cap_rights_t r_all; 18 static cap_rights_t r_all_nopeel; 19 #define DO_PEELOFF 0x1A 20 #define DO_TERM 0x1B 21 22 static int SctpClient(int port, unsigned char byte) { 23 // Create sockets 24 int sock = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP); 25 EXPECT_OK(sock); 26 if (sock < 0) return sock; 27 int cap_sock_ro = dup(sock); 28 EXPECT_OK(cap_sock_ro); 29 EXPECT_OK(cap_rights_limit(cap_sock_ro, &r_rw)); 30 int cap_sock_rw = dup(sock); 31 EXPECT_OK(cap_sock_rw); 32 EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw)); 33 int cap_sock_all = dup(sock); 34 EXPECT_OK(cap_sock_all); 35 EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all)); 36 close(sock); 37 38 // Send a message. Requires CAP_WRITE and CAP_CONNECT. 39 struct sockaddr_in serv_addr; 40 memset(&serv_addr, 0, sizeof(serv_addr)); 41 serv_addr.sin_family = AF_INET; 42 serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); 43 serv_addr.sin_port = htons(port); 44 45 EXPECT_NOTCAPABLE(sctp_sendmsg(cap_sock_ro, &byte, 1, 46 (struct sockaddr*)&serv_addr, sizeof(serv_addr), 47 0, 0, 1, 0, 0)); 48 EXPECT_NOTCAPABLE(sctp_sendmsg(cap_sock_rw, &byte, 1, 49 (struct sockaddr*)&serv_addr, sizeof(serv_addr), 50 0, 0, 1, 0, 0)); 51 if (verbose) fprintf(stderr, " [%d]sctp_sendmsg(%02x)\n", getpid_(), byte); 52 EXPECT_OK(sctp_sendmsg(cap_sock_all, &byte, 1, 53 (struct sockaddr*)&serv_addr, sizeof(serv_addr), 54 0, 0, 1, 0, 0)); 55 close(cap_sock_ro); 56 close(cap_sock_rw); 57 return cap_sock_all; 58 } 59 60 61 TEST(Sctp, Socket) { 62 int sock = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP); 63 if (sock == -1 && errno == EPROTONOSUPPORT) { 64 GTEST_SKIP() << "socket(..., IPPROTO_SCTP) -> EPROTONOSUPPORT"; 65 } 66 EXPECT_OK(sock); 67 if (sock < 0) return; 68 69 cap_rights_init(&r_ro, CAP_READ); 70 cap_rights_init(&r_wo, CAP_WRITE); 71 cap_rights_init(&r_rw, CAP_READ, CAP_WRITE); 72 cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER); 73 cap_rights_init(&r_all_nopeel, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER); 74 cap_rights_clear(&r_all_nopeel, CAP_PEELOFF); 75 76 int cap_sock_wo = dup(sock); 77 EXPECT_OK(cap_sock_wo); 78 EXPECT_OK(cap_rights_limit(cap_sock_wo, &r_wo)); 79 int cap_sock_rw = dup(sock); 80 EXPECT_OK(cap_sock_rw); 81 EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw)); 82 int cap_sock_all = dup(sock); 83 EXPECT_OK(cap_sock_all); 84 EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all)); 85 int cap_sock_all_nopeel = dup(sock); 86 EXPECT_OK(cap_sock_all_nopeel); 87 EXPECT_OK(cap_rights_limit(cap_sock_all_nopeel, &r_all_nopeel)); 88 close(sock); 89 90 struct sockaddr_in addr; 91 memset(&addr, 0, sizeof(addr)); 92 addr.sin_family = AF_INET; 93 addr.sin_port = htons(0); 94 addr.sin_addr.s_addr = htonl(INADDR_ANY); 95 socklen_t len = sizeof(addr); 96 97 // Can only bind the fully-capable socket. 98 EXPECT_NOTCAPABLE(bind(cap_sock_rw, (struct sockaddr *)&addr, len)); 99 EXPECT_OK(bind(cap_sock_all, (struct sockaddr *)&addr, len)); 100 101 EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr *)&addr, &len)); 102 int port = ntohs(addr.sin_port); 103 104 // Now we know the port involved, fork off children to run clients. 105 pid_t child1 = fork(); 106 if (child1 == 0) { 107 // Child process 1: wait for server setup 108 sleep(1); 109 // Send a message that triggers peeloff 110 int client_sock = SctpClient(port, DO_PEELOFF); 111 sleep(1); 112 close(client_sock); 113 exit(HasFailure()); 114 } 115 116 pid_t child2 = fork(); 117 if (child2 == 0) { 118 // Child process 2: wait for server setup 119 sleep(2); 120 // Send a message that triggers server exit 121 int client_sock = SctpClient(port, DO_TERM); 122 close(client_sock); 123 exit(HasFailure()); 124 } 125 126 // Can only listen on the fully-capable socket. 127 EXPECT_NOTCAPABLE(listen(cap_sock_rw, 3)); 128 EXPECT_OK(listen(cap_sock_all, 3)); 129 130 // Can only do socket operations on the fully-capable socket. 131 len = sizeof(addr); 132 EXPECT_NOTCAPABLE(getsockname(cap_sock_rw, (struct sockaddr*)&addr, &len)); 133 134 struct sctp_event_subscribe events; 135 memset(&events, 0, sizeof(events)); 136 events.sctp_association_event = 1; 137 events.sctp_data_io_event = 1; 138 EXPECT_NOTCAPABLE(setsockopt(cap_sock_rw, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events))); 139 len = sizeof(events); 140 EXPECT_NOTCAPABLE(getsockopt(cap_sock_rw, IPPROTO_SCTP, SCTP_EVENTS, &events, &len)); 141 memset(&events, 0, sizeof(events)); 142 events.sctp_association_event = 1; 143 events.sctp_data_io_event = 1; 144 EXPECT_OK(setsockopt(cap_sock_all, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events))); 145 len = sizeof(events); 146 EXPECT_OK(getsockopt(cap_sock_all, IPPROTO_SCTP, SCTP_EVENTS, &events, &len)); 147 148 len = sizeof(addr); 149 memset(&addr, 0, sizeof(addr)); 150 EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr*)&addr, &len)); 151 EXPECT_EQ(AF_INET, addr.sin_family); 152 EXPECT_EQ(htons(port), addr.sin_port); 153 154 struct sockaddr_in client_addr; 155 socklen_t addr_len = sizeof(client_addr); 156 unsigned char buffer[1024]; 157 struct sctp_sndrcvinfo sri; 158 memset(&sri, 0, sizeof(sri)); 159 int flags = 0; 160 EXPECT_NOTCAPABLE(sctp_recvmsg(cap_sock_wo, buffer, sizeof(buffer), 161 (struct sockaddr*)&client_addr, &addr_len, 162 &sri, &flags)); 163 while (true) { 164 retry: 165 memset(&sri, 0, sizeof(sri)); 166 int len = sctp_recvmsg(cap_sock_rw, buffer, sizeof(buffer), 167 (struct sockaddr*)&client_addr, &addr_len, 168 &sri, &flags); 169 if (len < 0 && errno == EAGAIN) goto retry; 170 EXPECT_OK(len); 171 if (len > 0) { 172 if (verbose) fprintf(stderr, "[%d]sctp_recvmsg(%02x..)", getpid_(), (unsigned)buffer[0]); 173 if (buffer[0] == DO_PEELOFF) { 174 if (verbose) fprintf(stderr, "..peeling off association %08lx\n", (long)sri.sinfo_assoc_id); 175 // Peel off the association. Needs CAP_PEELOFF. 176 int rc1 = sctp_peeloff(cap_sock_all_nopeel, sri.sinfo_assoc_id); 177 EXPECT_NOTCAPABLE(rc1); 178 int rc2 = sctp_peeloff(cap_sock_all, sri.sinfo_assoc_id); 179 EXPECT_OK(rc2); 180 int peeled = std::max(rc1, rc2); 181 if (peeled > 0) { 182 // Peeled off FD should have same rights as original socket. 183 cap_rights_t rights; 184 EXPECT_OK(cap_rights_get(peeled, &rights)); 185 EXPECT_RIGHTS_EQ(&r_all, &rights); 186 close(peeled); 187 } 188 } else if (buffer[0] == DO_TERM) { 189 if (verbose) fprintf(stderr, "..terminating server\n"); 190 break; 191 } 192 } else if (len < 0) { 193 break; 194 } 195 } 196 197 // Wait for the children. 198 int status; 199 int rc; 200 EXPECT_EQ(child1, waitpid(child1, &status, 0)); 201 rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1; 202 EXPECT_EQ(0, rc); 203 EXPECT_EQ(child2, waitpid(child2, &status, 0)); 204 rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1; 205 EXPECT_EQ(0, rc); 206 207 close(cap_sock_wo); 208 close(cap_sock_rw); 209 close(cap_sock_all); 210 close(cap_sock_all_nopeel); 211 } 212