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 #ifdef HAVE_SCTP
15 static cap_rights_t r_ro;
16 static cap_rights_t r_wo;
17 static cap_rights_t r_rw;
18 static cap_rights_t r_all;
19 static cap_rights_t r_all_nopeel;
20 #define DO_PEELOFF 0x1A
21 #define DO_TERM 0x1B
22
SctpClient(int port,unsigned char byte)23 static int SctpClient(int port, unsigned char byte) {
24 // Create sockets
25 int sock = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
26 EXPECT_OK(sock);
27 if (sock < 0) return sock;
28 int cap_sock_ro = dup(sock);
29 EXPECT_OK(cap_sock_ro);
30 EXPECT_OK(cap_rights_limit(cap_sock_ro, &r_rw));
31 int cap_sock_rw = dup(sock);
32 EXPECT_OK(cap_sock_rw);
33 EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
34 int cap_sock_all = dup(sock);
35 EXPECT_OK(cap_sock_all);
36 EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
37 close(sock);
38
39 // Send a message. Requires CAP_WRITE and CAP_CONNECT.
40 struct sockaddr_in serv_addr;
41 memset(&serv_addr, 0, sizeof(serv_addr));
42 serv_addr.sin_family = AF_INET;
43 serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
44 serv_addr.sin_port = htons(port);
45
46 EXPECT_NOTCAPABLE(sctp_sendmsg(cap_sock_ro, &byte, 1,
47 (struct sockaddr*)&serv_addr, sizeof(serv_addr),
48 0, 0, 1, 0, 0));
49 EXPECT_NOTCAPABLE(sctp_sendmsg(cap_sock_rw, &byte, 1,
50 (struct sockaddr*)&serv_addr, sizeof(serv_addr),
51 0, 0, 1, 0, 0));
52 if (verbose) fprintf(stderr, " [%d]sctp_sendmsg(%02x)\n", getpid_(), byte);
53 EXPECT_OK(sctp_sendmsg(cap_sock_all, &byte, 1,
54 (struct sockaddr*)&serv_addr, sizeof(serv_addr),
55 0, 0, 1, 0, 0));
56 close(cap_sock_ro);
57 close(cap_sock_rw);
58 return cap_sock_all;
59 }
60
61
TEST(Sctp,Socket)62 TEST(Sctp, Socket) {
63 int sock = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
64 if (sock == -1 && errno == EPROTONOSUPPORT) {
65 GTEST_SKIP() << "socket(..., IPPROTO_SCTP) -> EPROTONOSUPPORT";
66 }
67 EXPECT_OK(sock);
68 if (sock < 0) return;
69
70 cap_rights_init(&r_ro, CAP_READ);
71 cap_rights_init(&r_wo, CAP_WRITE);
72 cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
73 cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER);
74 cap_rights_init(&r_all_nopeel, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER);
75 cap_rights_clear(&r_all_nopeel, CAP_PEELOFF);
76
77 int cap_sock_wo = dup(sock);
78 EXPECT_OK(cap_sock_wo);
79 EXPECT_OK(cap_rights_limit(cap_sock_wo, &r_wo));
80 int cap_sock_rw = dup(sock);
81 EXPECT_OK(cap_sock_rw);
82 EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
83 int cap_sock_all = dup(sock);
84 EXPECT_OK(cap_sock_all);
85 EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
86 int cap_sock_all_nopeel = dup(sock);
87 EXPECT_OK(cap_sock_all_nopeel);
88 EXPECT_OK(cap_rights_limit(cap_sock_all_nopeel, &r_all_nopeel));
89 close(sock);
90
91 struct sockaddr_in addr;
92 memset(&addr, 0, sizeof(addr));
93 addr.sin_family = AF_INET;
94 addr.sin_port = htons(0);
95 addr.sin_addr.s_addr = htonl(INADDR_ANY);
96 socklen_t len = sizeof(addr);
97
98 // Can only bind the fully-capable socket.
99 EXPECT_NOTCAPABLE(bind(cap_sock_rw, (struct sockaddr *)&addr, len));
100 EXPECT_OK(bind(cap_sock_all, (struct sockaddr *)&addr, len));
101
102 EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr *)&addr, &len));
103 int port = ntohs(addr.sin_port);
104
105 // Now we know the port involved, fork off children to run clients.
106 pid_t child1 = fork();
107 if (child1 == 0) {
108 // Child process 1: wait for server setup
109 sleep(1);
110 // Send a message that triggers peeloff
111 int client_sock = SctpClient(port, DO_PEELOFF);
112 sleep(1);
113 close(client_sock);
114 exit(HasFailure());
115 }
116
117 pid_t child2 = fork();
118 if (child2 == 0) {
119 // Child process 2: wait for server setup
120 sleep(2);
121 // Send a message that triggers server exit
122 int client_sock = SctpClient(port, DO_TERM);
123 close(client_sock);
124 exit(HasFailure());
125 }
126
127 // Can only listen on the fully-capable socket.
128 EXPECT_NOTCAPABLE(listen(cap_sock_rw, 3));
129 EXPECT_OK(listen(cap_sock_all, 3));
130
131 // Can only do socket operations on the fully-capable socket.
132 len = sizeof(addr);
133 EXPECT_NOTCAPABLE(getsockname(cap_sock_rw, (struct sockaddr*)&addr, &len));
134
135 struct sctp_event_subscribe events;
136 memset(&events, 0, sizeof(events));
137 events.sctp_association_event = 1;
138 events.sctp_data_io_event = 1;
139 EXPECT_NOTCAPABLE(setsockopt(cap_sock_rw, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events)));
140 len = sizeof(events);
141 EXPECT_NOTCAPABLE(getsockopt(cap_sock_rw, IPPROTO_SCTP, SCTP_EVENTS, &events, &len));
142 memset(&events, 0, sizeof(events));
143 events.sctp_association_event = 1;
144 events.sctp_data_io_event = 1;
145 EXPECT_OK(setsockopt(cap_sock_all, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events)));
146 len = sizeof(events);
147 EXPECT_OK(getsockopt(cap_sock_all, IPPROTO_SCTP, SCTP_EVENTS, &events, &len));
148
149 len = sizeof(addr);
150 memset(&addr, 0, sizeof(addr));
151 EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr*)&addr, &len));
152 EXPECT_EQ(AF_INET, addr.sin_family);
153 EXPECT_EQ(htons(port), addr.sin_port);
154
155 struct sockaddr_in client_addr;
156 socklen_t addr_len = sizeof(client_addr);
157 unsigned char buffer[1024];
158 struct sctp_sndrcvinfo sri;
159 memset(&sri, 0, sizeof(sri));
160 int flags = 0;
161 EXPECT_NOTCAPABLE(sctp_recvmsg(cap_sock_wo, buffer, sizeof(buffer),
162 (struct sockaddr*)&client_addr, &addr_len,
163 &sri, &flags));
164 while (true) {
165 retry:
166 memset(&sri, 0, sizeof(sri));
167 int len = sctp_recvmsg(cap_sock_rw, buffer, sizeof(buffer),
168 (struct sockaddr*)&client_addr, &addr_len,
169 &sri, &flags);
170 if (len < 0 && errno == EAGAIN) goto retry;
171 EXPECT_OK(len);
172 if (len > 0) {
173 if (verbose) fprintf(stderr, "[%d]sctp_recvmsg(%02x..)", getpid_(), (unsigned)buffer[0]);
174 if (buffer[0] == DO_PEELOFF) {
175 if (verbose) fprintf(stderr, "..peeling off association %08lx\n", (long)sri.sinfo_assoc_id);
176 // Peel off the association. Needs CAP_PEELOFF.
177 int rc1 = sctp_peeloff(cap_sock_all_nopeel, sri.sinfo_assoc_id);
178 EXPECT_NOTCAPABLE(rc1);
179 int rc2 = sctp_peeloff(cap_sock_all, sri.sinfo_assoc_id);
180 EXPECT_OK(rc2);
181 int peeled = std::max(rc1, rc2);
182 if (peeled > 0) {
183 #ifdef CAP_FROM_PEELOFF
184 // Peeled off FD should have same rights as original socket.
185 cap_rights_t rights;
186 EXPECT_OK(cap_rights_get(peeled, &rights));
187 EXPECT_RIGHTS_EQ(&r_all, &rights);
188 #endif
189 close(peeled);
190 }
191 } else if (buffer[0] == DO_TERM) {
192 if (verbose) fprintf(stderr, "..terminating server\n");
193 break;
194 }
195 } else if (len < 0) {
196 break;
197 }
198 }
199
200 // Wait for the children.
201 int status;
202 int rc;
203 EXPECT_EQ(child1, waitpid(child1, &status, 0));
204 rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
205 EXPECT_EQ(0, rc);
206 EXPECT_EQ(child2, waitpid(child2, &status, 0));
207 rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
208 EXPECT_EQ(0, rc);
209
210 close(cap_sock_wo);
211 close(cap_sock_rw);
212 close(cap_sock_all);
213 close(cap_sock_all_nopeel);
214 }
215 #endif
216