Annotation of src/usr.bin/ssh/ssh-pkcs11-client.c, Revision 1.8
1.8 ! tb 1: /* $OpenBSD: ssh-pkcs11-client.c,v 1.7 2017/05/30 08:52:19 markus 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: {
1.8 ! tb 96: if (fd >= 0)
! 97: close(fd);
1.1 markus 98: }
99:
100: static int
101: pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
102: int padding)
103: {
1.7 markus 104: struct sshkey key; /* XXX */
1.1 markus 105: u_char *blob, *signature = NULL;
106: u_int blen, slen = 0;
107: int ret = -1;
108: Buffer msg;
109:
110: if (padding != RSA_PKCS1_PADDING)
111: return (-1);
112: key.type = KEY_RSA;
113: key.rsa = rsa;
114: if (key_to_blob(&key, &blob, &blen) == 0)
115: return -1;
116: buffer_init(&msg);
117: buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
118: buffer_put_string(&msg, blob, blen);
119: buffer_put_string(&msg, from, flen);
120: buffer_put_int(&msg, 0);
1.4 djm 121: free(blob);
1.1 markus 122: send_msg(&msg);
1.3 miod 123: buffer_clear(&msg);
1.1 markus 124:
125: if (recv_msg(&msg) == SSH2_AGENT_SIGN_RESPONSE) {
126: signature = buffer_get_string(&msg, &slen);
127: if (slen <= (u_int)RSA_size(rsa)) {
128: memcpy(to, signature, slen);
129: ret = slen;
130: }
1.4 djm 131: free(signature);
1.1 markus 132: }
1.3 miod 133: buffer_free(&msg);
1.1 markus 134: return (ret);
135: }
136:
137: /* redirect the private key encrypt operation to the ssh-pkcs11-helper */
138: static int
139: wrap_key(RSA *rsa)
140: {
141: static RSA_METHOD helper_rsa;
142:
143: memcpy(&helper_rsa, RSA_get_default_method(), sizeof(helper_rsa));
144: helper_rsa.name = "ssh-pkcs11-helper";
145: helper_rsa.rsa_priv_enc = pkcs11_rsa_private_encrypt;
146: RSA_set_method(rsa, &helper_rsa);
147: return (0);
148: }
149:
150: static int
151: pkcs11_start_helper(void)
152: {
153: int pair[2];
154:
155: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) {
156: error("socketpair: %s", strerror(errno));
157: return (-1);
158: }
159: if ((pid = fork()) == -1) {
160: error("fork: %s", strerror(errno));
161: return (-1);
162: } else if (pid == 0) {
163: if ((dup2(pair[1], STDIN_FILENO) == -1) ||
164: (dup2(pair[1], STDOUT_FILENO) == -1)) {
165: fprintf(stderr, "dup2: %s\n", strerror(errno));
166: _exit(1);
167: }
168: close(pair[0]);
169: close(pair[1]);
170: execlp(_PATH_SSH_PKCS11_HELPER, _PATH_SSH_PKCS11_HELPER,
1.6 mmcc 171: (char *)NULL);
1.1 markus 172: fprintf(stderr, "exec: %s: %s\n", _PATH_SSH_PKCS11_HELPER,
173: strerror(errno));
174: _exit(1);
175: }
176: close(pair[1]);
177: fd = pair[0];
178: return (0);
179: }
180:
181: int
182: pkcs11_add_provider(char *name, char *pin, Key ***keysp)
183: {
1.7 markus 184: struct sshkey *k;
1.1 markus 185: int i, nkeys;
186: u_char *blob;
187: u_int blen;
188: Buffer msg;
189:
190: if (fd < 0 && pkcs11_start_helper() < 0)
191: return (-1);
192:
193: buffer_init(&msg);
194: buffer_put_char(&msg, SSH_AGENTC_ADD_SMARTCARD_KEY);
195: buffer_put_cstring(&msg, name);
196: buffer_put_cstring(&msg, pin);
197: send_msg(&msg);
198: buffer_clear(&msg);
199:
200: if (recv_msg(&msg) == SSH2_AGENT_IDENTITIES_ANSWER) {
201: nkeys = buffer_get_int(&msg);
202: *keysp = xcalloc(nkeys, sizeof(Key *));
203: for (i = 0; i < nkeys; i++) {
204: blob = buffer_get_string(&msg, &blen);
1.4 djm 205: free(buffer_get_string(&msg, NULL));
1.1 markus 206: k = key_from_blob(blob, blen);
207: wrap_key(k->rsa);
208: (*keysp)[i] = k;
1.4 djm 209: free(blob);
1.1 markus 210: }
211: } else {
212: nkeys = -1;
213: }
214: buffer_free(&msg);
215: return (nkeys);
216: }
217:
218: int
219: pkcs11_del_provider(char *name)
220: {
221: int ret = -1;
222: Buffer msg;
223:
224: buffer_init(&msg);
225: buffer_put_char(&msg, SSH_AGENTC_REMOVE_SMARTCARD_KEY);
226: buffer_put_cstring(&msg, name);
227: buffer_put_cstring(&msg, "");
228: send_msg(&msg);
229: buffer_clear(&msg);
230:
231: if (recv_msg(&msg) == SSH_AGENT_SUCCESS)
232: ret = 0;
233: buffer_free(&msg);
234: return (ret);
235: }
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