Annotation of src/usr.bin/ssh/ssh-pkcs11-client.c, Revision 1.6
1.6 ! mmcc 1: /* $OpenBSD: ssh-pkcs11-client.c,v 1.5 2014/06/24 01:13:21 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2010 Markus Friedl. All rights reserved.
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: #include <sys/types.h>
19: #include <sys/time.h>
20: #include <sys/socket.h>
21:
22: #include <stdarg.h>
23: #include <string.h>
24: #include <unistd.h>
25: #include <errno.h>
1.5 djm 26:
27: #include <openssl/rsa.h>
1.1 markus 28:
29: #include "pathnames.h"
30: #include "xmalloc.h"
31: #include "buffer.h"
32: #include "log.h"
33: #include "misc.h"
34: #include "key.h"
35: #include "authfd.h"
36: #include "atomicio.h"
37: #include "ssh-pkcs11.h"
38:
39: /* borrows code from sftp-server and ssh-agent */
40:
41: int fd = -1;
42: pid_t pid = -1;
43:
44: static void
45: send_msg(Buffer *m)
46: {
47: u_char buf[4];
48: int mlen = buffer_len(m);
49:
50: put_u32(buf, mlen);
51: if (atomicio(vwrite, fd, buf, 4) != 4 ||
52: atomicio(vwrite, fd, buffer_ptr(m),
53: buffer_len(m)) != buffer_len(m))
54: error("write to helper failed");
55: buffer_consume(m, mlen);
56: }
57:
58: static int
59: recv_msg(Buffer *m)
60: {
61: u_int l, len;
62: u_char buf[1024];
63:
64: if ((len = atomicio(read, fd, buf, 4)) != 4) {
65: error("read from helper failed: %u", len);
66: return (0); /* XXX */
67: }
68: len = get_u32(buf);
69: if (len > 256 * 1024)
70: fatal("response too long: %u", len);
71: /* read len bytes into m */
72: buffer_clear(m);
73: while (len > 0) {
74: l = len;
75: if (l > sizeof(buf))
76: l = sizeof(buf);
77: if (atomicio(read, fd, buf, l) != l) {
78: error("response from helper failed.");
79: return (0); /* XXX */
80: }
81: buffer_append(m, buf, l);
82: len -= l;
83: }
84: return (buffer_get_char(m));
85: }
86:
87: int
88: pkcs11_init(int interactive)
89: {
90: return (0);
91: }
92:
93: void
94: pkcs11_terminate(void)
95: {
96: close(fd);
97: }
98:
99: static int
100: pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
101: int padding)
102: {
103: Key key;
104: u_char *blob, *signature = NULL;
105: u_int blen, slen = 0;
106: int ret = -1;
107: Buffer msg;
108:
109: if (padding != RSA_PKCS1_PADDING)
110: return (-1);
111: key.type = KEY_RSA;
112: key.rsa = rsa;
113: if (key_to_blob(&key, &blob, &blen) == 0)
114: return -1;
115: buffer_init(&msg);
116: buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
117: buffer_put_string(&msg, blob, blen);
118: buffer_put_string(&msg, from, flen);
119: buffer_put_int(&msg, 0);
1.4 djm 120: free(blob);
1.1 markus 121: send_msg(&msg);
1.3 miod 122: buffer_clear(&msg);
1.1 markus 123:
124: if (recv_msg(&msg) == SSH2_AGENT_SIGN_RESPONSE) {
125: signature = buffer_get_string(&msg, &slen);
126: if (slen <= (u_int)RSA_size(rsa)) {
127: memcpy(to, signature, slen);
128: ret = slen;
129: }
1.4 djm 130: free(signature);
1.1 markus 131: }
1.3 miod 132: buffer_free(&msg);
1.1 markus 133: return (ret);
134: }
135:
136: /* redirect the private key encrypt operation to the ssh-pkcs11-helper */
137: static int
138: wrap_key(RSA *rsa)
139: {
140: static RSA_METHOD helper_rsa;
141:
142: memcpy(&helper_rsa, RSA_get_default_method(), sizeof(helper_rsa));
143: helper_rsa.name = "ssh-pkcs11-helper";
144: helper_rsa.rsa_priv_enc = pkcs11_rsa_private_encrypt;
145: RSA_set_method(rsa, &helper_rsa);
146: return (0);
147: }
148:
149: static int
150: pkcs11_start_helper(void)
151: {
152: int pair[2];
153:
154: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) {
155: error("socketpair: %s", strerror(errno));
156: return (-1);
157: }
158: if ((pid = fork()) == -1) {
159: error("fork: %s", strerror(errno));
160: return (-1);
161: } else if (pid == 0) {
162: if ((dup2(pair[1], STDIN_FILENO) == -1) ||
163: (dup2(pair[1], STDOUT_FILENO) == -1)) {
164: fprintf(stderr, "dup2: %s\n", strerror(errno));
165: _exit(1);
166: }
167: close(pair[0]);
168: close(pair[1]);
169: execlp(_PATH_SSH_PKCS11_HELPER, _PATH_SSH_PKCS11_HELPER,
1.6 ! mmcc 170: (char *)NULL);
1.1 markus 171: fprintf(stderr, "exec: %s: %s\n", _PATH_SSH_PKCS11_HELPER,
172: strerror(errno));
173: _exit(1);
174: }
175: close(pair[1]);
176: fd = pair[0];
177: return (0);
178: }
179:
180: int
181: pkcs11_add_provider(char *name, char *pin, Key ***keysp)
182: {
183: Key *k;
184: int i, nkeys;
185: u_char *blob;
186: u_int blen;
187: Buffer msg;
188:
189: if (fd < 0 && pkcs11_start_helper() < 0)
190: return (-1);
191:
192: buffer_init(&msg);
193: buffer_put_char(&msg, SSH_AGENTC_ADD_SMARTCARD_KEY);
194: buffer_put_cstring(&msg, name);
195: buffer_put_cstring(&msg, pin);
196: send_msg(&msg);
197: buffer_clear(&msg);
198:
199: if (recv_msg(&msg) == SSH2_AGENT_IDENTITIES_ANSWER) {
200: nkeys = buffer_get_int(&msg);
201: *keysp = xcalloc(nkeys, sizeof(Key *));
202: for (i = 0; i < nkeys; i++) {
203: blob = buffer_get_string(&msg, &blen);
1.4 djm 204: free(buffer_get_string(&msg, NULL));
1.1 markus 205: k = key_from_blob(blob, blen);
206: wrap_key(k->rsa);
207: (*keysp)[i] = k;
1.4 djm 208: free(blob);
1.1 markus 209: }
210: } else {
211: nkeys = -1;
212: }
213: buffer_free(&msg);
214: return (nkeys);
215: }
216:
217: int
218: pkcs11_del_provider(char *name)
219: {
220: int ret = -1;
221: Buffer msg;
222:
223: buffer_init(&msg);
224: buffer_put_char(&msg, SSH_AGENTC_REMOVE_SMARTCARD_KEY);
225: buffer_put_cstring(&msg, name);
226: buffer_put_cstring(&msg, "");
227: send_msg(&msg);
228: buffer_clear(&msg);
229:
230: if (recv_msg(&msg) == SSH_AGENT_SUCCESS)
231: ret = 0;
232: buffer_free(&msg);
233: return (ret);
234: }
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