1 | /* |
2 | * Copyright (c) 2013-2021 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | |
29 | #include <sys/types.h> |
30 | #include <sys/malloc.h> |
31 | #include <sys/proc.h> |
32 | #include <sys/sysctl.h> |
33 | #include <sys/syslog.h> |
34 | |
35 | #include <net/if.h> |
36 | |
37 | #include <netinet/in.h> |
38 | #include <netinet6/in6_var.h> |
39 | #include <netinet/ip6.h> |
40 | #include <netinet6/ip6_var.h> |
41 | #include <netinet6/nd6.h> |
42 | |
43 | #if CONFIG_MACF |
44 | #include <sys/kauth.h> |
45 | #include <security/mac_framework.h> |
46 | #endif |
47 | |
48 | SYSCTL_DECL(_net_inet6); /* Note: Not in any common header. */ |
49 | |
50 | SYSCTL_NODE(_net_inet6, OID_AUTO, send, CTLFLAG_RW | CTLFLAG_LOCKED, 0, |
51 | "IPv6 Secure Neighbor Discovery" ); |
52 | |
53 | static int nd6_send_opmode = ND6_SEND_OPMODE_CGA_QUIET; |
54 | SYSCTL_INT(_net_inet6_send, OID_AUTO, opmode, CTLFLAG_RW | CTLFLAG_LOCKED, |
55 | &nd6_send_opmode, 0, "configured SEND operating mode" ); |
56 | |
57 | int nd6_send_opstate = ND6_SEND_OPMODE_DISABLED; |
58 | SYSCTL_INT(_net_inet6_send, OID_AUTO, opstate, CTLFLAG_RD | CTLFLAG_LOCKED, |
59 | &nd6_send_opstate, 0, "current SEND operating state" ); |
60 | |
61 | static int sysctl_cga_parameters SYSCTL_HANDLER_ARGS; |
62 | |
63 | SYSCTL_PROC(_net_inet6_send, OID_AUTO, cga_parameters, |
64 | CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, |
65 | sysctl_cga_parameters, "S,nd6_send_nodecfg" , "" ); |
66 | |
67 | /* |
68 | * The size of the buffer is sufficient to contain a public key, its size in |
69 | * machine binary type for the kernel, and the CGA precalc for the global |
70 | * scope. This interface is not a public API, so we don't anticipate that the |
71 | * userland and the kernel will be mismatched between ILP32 and LP64. |
72 | */ |
73 | #define SYSCTL_CGA_PARAMETERS_BUFFER_SIZE \ |
74 | (2 * (sizeof (u_int16_t) + IN6_CGA_KEY_MAXSIZE) + \ |
75 | sizeof (struct in6_cga_prepare)) |
76 | |
77 | static int |
78 | sysctl_cga_parameters SYSCTL_HANDLER_ARGS |
79 | { |
80 | #pragma unused(oidp, arg1) |
81 | u_int namelen; |
82 | char *oldp, *newp; |
83 | const char *fin; |
84 | struct in6_cga_nodecfg cfg; |
85 | struct iovec *iov; |
86 | int error; |
87 | char *buffer; |
88 | u_int16_t u16; |
89 | |
90 | namelen = arg2; |
91 | if (namelen != 0) { |
92 | log(LOG_ERR, "%s: name length err [len=%u]\n" , __func__, |
93 | namelen); |
94 | return EINVAL; |
95 | } |
96 | |
97 | if (req->newlen > SYSCTL_CGA_PARAMETERS_BUFFER_SIZE) { |
98 | log(LOG_ERR, "%s: input buffer size error [len=%zu]\n" , |
99 | __func__, req->newlen); |
100 | return EINVAL; |
101 | } |
102 | |
103 | #if CONFIG_MACF |
104 | error = mac_system_check_info(current_cached_proc_cred(req->p), |
105 | info_type: "net.inet6.send.cga_parameters" ); |
106 | if (error != 0) { |
107 | log(LOG_ERR, "%s: mac_system_check_info denied.\n" , __func__); |
108 | return EPERM; |
109 | } |
110 | #endif |
111 | |
112 | buffer = (char *)kalloc_data(SYSCTL_CGA_PARAMETERS_BUFFER_SIZE, |
113 | Z_WAITOK | Z_ZERO); |
114 | if (buffer == NULL) { |
115 | log(LOG_ERR, "%s: could not allocate marshaling buffer.\n" , |
116 | __func__); |
117 | return ENOMEM; |
118 | } |
119 | |
120 | in6_cga_node_lock(); |
121 | |
122 | if (req->oldptr != USER_ADDR_NULL && req->oldlen > 0) { |
123 | oldp = buffer; |
124 | fin = &buffer[SYSCTL_CGA_PARAMETERS_BUFFER_SIZE]; |
125 | if (req->oldlen < SYSCTL_CGA_PARAMETERS_BUFFER_SIZE) { |
126 | fin = &buffer[req->oldlen]; |
127 | } |
128 | |
129 | in6_cga_query(&cfg); |
130 | iov = &cfg.cga_pubkey; |
131 | if (iov->iov_len > 0) { |
132 | VERIFY(iov->iov_len < UINT16_MAX); |
133 | |
134 | if (&oldp[sizeof(cfg.cga_prepare)] <= fin) { |
135 | bcopy(src: &cfg.cga_prepare, dst: oldp, |
136 | n: sizeof(cfg.cga_prepare)); |
137 | } |
138 | oldp += sizeof(cfg.cga_prepare); |
139 | |
140 | if (&oldp[sizeof(u16)] < fin) { |
141 | u16 = (u_int16_t) iov->iov_len; |
142 | bcopy(src: &u16, dst: oldp, n: sizeof(u16)); |
143 | } |
144 | oldp += sizeof(u16); |
145 | |
146 | if (&oldp[iov->iov_len] < fin) { |
147 | bcopy(src: iov->iov_base, dst: oldp, n: iov->iov_len); |
148 | } |
149 | oldp += iov->iov_len; |
150 | |
151 | if (oldp > fin) { |
152 | req->oldlen = oldp - buffer; |
153 | log(LOG_ERR, "%s: marshalled data too large.\n" , |
154 | __func__); |
155 | error = ENOMEM; |
156 | goto done; |
157 | } |
158 | } |
159 | |
160 | error = SYSCTL_OUT(req, buffer, oldp - buffer); |
161 | if (error) { |
162 | goto done; |
163 | } |
164 | } |
165 | |
166 | if (req->newptr == USER_ADDR_NULL) { |
167 | goto done; |
168 | } |
169 | |
170 | error = proc_suser(p: current_proc()); |
171 | if (error) { |
172 | goto done; |
173 | } |
174 | |
175 | if (req->newlen == 0) { |
176 | in6_cga_stop(); |
177 | nd6_send_opstate = ND6_SEND_OPMODE_DISABLED; |
178 | goto done; |
179 | } |
180 | |
181 | error = SYSCTL_IN(req, buffer, req->newlen); |
182 | if (error) { |
183 | goto done; |
184 | } |
185 | |
186 | newp = buffer; |
187 | fin = &buffer[req->newlen]; |
188 | |
189 | bzero(s: &cfg, n: sizeof cfg); |
190 | |
191 | if (&newp[sizeof(cfg.cga_prepare)] <= fin) { |
192 | bcopy(src: newp, dst: &cfg.cga_prepare, n: sizeof(cfg.cga_prepare)); |
193 | } |
194 | newp += sizeof(cfg.cga_prepare); |
195 | |
196 | iov = &cfg.cga_privkey; |
197 | if (&newp[sizeof(u16)] < fin) { |
198 | bcopy(src: newp, dst: &u16, n: sizeof(u16)); |
199 | iov->iov_len = u16; |
200 | |
201 | if (iov->iov_len > IN6_CGA_KEY_MAXSIZE) { |
202 | error = EINVAL; |
203 | goto done; |
204 | } |
205 | } |
206 | newp += sizeof(u16); |
207 | |
208 | iov->iov_base = newp; |
209 | newp += iov->iov_len; |
210 | |
211 | iov = &cfg.cga_pubkey; |
212 | if (&newp[sizeof(u16)] < fin) { |
213 | bcopy(src: newp, dst: &u16, n: sizeof(u16)); |
214 | iov->iov_len = u16; |
215 | |
216 | if (iov->iov_len > IN6_CGA_KEY_MAXSIZE) { |
217 | error = EINVAL; |
218 | goto done; |
219 | } |
220 | } |
221 | newp += sizeof(u16); |
222 | |
223 | iov->iov_base = newp; |
224 | newp += iov->iov_len; |
225 | |
226 | if (newp > fin) { |
227 | log(LOG_ERR, "%s: input too large [octets=%ld].\n" , __func__, |
228 | newp - fin); |
229 | error = ENOMEM; |
230 | goto done; |
231 | } |
232 | |
233 | error = in6_cga_start(&cfg); |
234 | if (!error) { |
235 | nd6_send_opstate = nd6_send_opmode; |
236 | } else { |
237 | log(LOG_ERR, "%s: in6_cga_start error=%d.\n" , __func__, |
238 | error); |
239 | } |
240 | |
241 | done: |
242 | in6_cga_node_unlock(); |
243 | kfree_data(buffer, SYSCTL_CGA_PARAMETERS_BUFFER_SIZE); |
244 | return error; |
245 | } |
246 | |
247 | /* End of file */ |
248 | |