djm@openbsd.org | 59d01f1 | 2020-01-25 23:13:09 +0000 | [diff] [blame] | 1 | /* $OpenBSD: ssh-sk-helper.c,v 1.9 2020/01/25 23:13:09 djm Exp $ */ |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2019 Google LLC |
| 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 | /* |
| 19 | * This is a tiny program used to isolate the address space used for |
| 20 | * security key middleware signing operations from ssh-agent. It is similar |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 21 | * to ssh-pkcs11-helper.c but considerably simpler as the operations for |
| 22 | * security keys are stateless. |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 23 | * |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 24 | * Please crank SSH_SK_HELPER_VERSION in sshkey.h for any incompatible |
| 25 | * protocol changes. |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 26 | */ |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 27 | |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 28 | #include "includes.h" |
| 29 | |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 30 | #include <limits.h> |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 31 | #include <stdarg.h> |
| 32 | #include <stdio.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <string.h> |
| 35 | #include <unistd.h> |
| 36 | #include <errno.h> |
| 37 | |
| 38 | #include "xmalloc.h" |
| 39 | #include "log.h" |
| 40 | #include "sshkey.h" |
| 41 | #include "authfd.h" |
| 42 | #include "misc.h" |
| 43 | #include "sshbuf.h" |
| 44 | #include "msg.h" |
| 45 | #include "uidswap.h" |
| 46 | #include "sshkey.h" |
| 47 | #include "ssherr.h" |
| 48 | #include "ssh-sk.h" |
| 49 | |
Damien Miller | 764d51e | 2019-11-01 13:34:49 +1100 | [diff] [blame] | 50 | #ifdef ENABLE_SK |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 51 | extern char *__progname; |
| 52 | |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 53 | static struct sshbuf *reply_error(int r, char *fmt, ...) |
| 54 | __attribute__((__format__ (printf, 2, 3))); |
| 55 | |
| 56 | static struct sshbuf * |
| 57 | reply_error(int r, char *fmt, ...) |
| 58 | { |
| 59 | char *msg; |
| 60 | va_list ap; |
| 61 | struct sshbuf *resp; |
| 62 | |
| 63 | va_start(ap, fmt); |
| 64 | xvasprintf(&msg, fmt, ap); |
| 65 | va_end(ap); |
djm@openbsd.org | 59d01f1 | 2020-01-25 23:13:09 +0000 | [diff] [blame] | 66 | debug("%s: %s", __progname, msg); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 67 | free(msg); |
| 68 | |
| 69 | if (r >= 0) |
| 70 | fatal("%s: invalid error code %d", __func__, r); |
| 71 | |
| 72 | if ((resp = sshbuf_new()) == NULL) |
| 73 | fatal("%s: sshbuf_new failed", __progname); |
| 74 | if (sshbuf_put_u32(resp, SSH_SK_HELPER_ERROR) != 0 || |
| 75 | sshbuf_put_u32(resp, (u_int)-r) != 0) |
| 76 | fatal("%s: buffer error", __progname); |
| 77 | return resp; |
| 78 | } |
| 79 | |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 80 | /* If the specified string is zero length, then free it and replace with NULL */ |
| 81 | static void |
| 82 | null_empty(char **s) |
| 83 | { |
| 84 | if (s == NULL || *s == NULL || **s != '\0') |
| 85 | return; |
| 86 | |
| 87 | free(*s); |
| 88 | *s = NULL; |
| 89 | } |
| 90 | |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 91 | static struct sshbuf * |
| 92 | process_sign(struct sshbuf *req) |
| 93 | { |
| 94 | int r = SSH_ERR_INTERNAL_ERROR; |
| 95 | struct sshbuf *resp, *kbuf; |
| 96 | struct sshkey *key; |
| 97 | uint32_t compat; |
| 98 | const u_char *message; |
| 99 | u_char *sig; |
| 100 | size_t msglen, siglen; |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 101 | char *provider, *pin; |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 102 | |
| 103 | if ((r = sshbuf_froms(req, &kbuf)) != 0 || |
| 104 | (r = sshbuf_get_cstring(req, &provider, NULL)) != 0 || |
| 105 | (r = sshbuf_get_string_direct(req, &message, &msglen)) != 0 || |
| 106 | (r = sshbuf_get_cstring(req, NULL, NULL)) != 0 || /* alg */ |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 107 | (r = sshbuf_get_u32(req, &compat)) != 0 || |
| 108 | (r = sshbuf_get_cstring(req, &pin, NULL)) != 0) |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 109 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
| 110 | if (sshbuf_len(req) != 0) |
| 111 | fatal("%s: trailing data in request", __progname); |
| 112 | |
| 113 | if ((r = sshkey_private_deserialize(kbuf, &key)) != 0) |
| 114 | fatal("Unable to parse private key: %s", ssh_err(r)); |
| 115 | if (!sshkey_is_sk(key)) |
| 116 | fatal("Unsupported key type %s", sshkey_ssh_name(key)); |
| 117 | |
| 118 | debug("%s: ready to sign with key %s, provider %s: " |
| 119 | "msg len %zu, compat 0x%lx", __progname, sshkey_type(key), |
| 120 | provider, msglen, (u_long)compat); |
| 121 | |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 122 | null_empty(&pin); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 123 | |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 124 | if ((r = sshsk_sign(provider, key, &sig, &siglen, |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 125 | message, msglen, compat, pin)) != 0) { |
| 126 | resp = reply_error(r, "Signing failed: %s", ssh_err(r)); |
| 127 | goto out; |
| 128 | } |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 129 | |
| 130 | if ((resp = sshbuf_new()) == NULL) |
| 131 | fatal("%s: sshbuf_new failed", __progname); |
| 132 | |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 133 | if ((r = sshbuf_put_u32(resp, SSH_SK_HELPER_SIGN)) != 0 || |
| 134 | (r = sshbuf_put_string(resp, sig, siglen)) != 0) |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 135 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 136 | out: |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 137 | sshbuf_free(kbuf); |
| 138 | free(provider); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 139 | if (pin != NULL) |
| 140 | freezero(pin, strlen(pin)); |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 141 | return resp; |
| 142 | } |
| 143 | |
| 144 | static struct sshbuf * |
| 145 | process_enroll(struct sshbuf *req) |
| 146 | { |
| 147 | int r; |
| 148 | u_int type; |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 149 | char *provider, *application, *pin, *device, *userid; |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 150 | uint8_t flags; |
| 151 | struct sshbuf *challenge, *attest, *kbuf, *resp; |
| 152 | struct sshkey *key; |
| 153 | |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 154 | if ((attest = sshbuf_new()) == NULL || |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 155 | (kbuf = sshbuf_new()) == NULL) |
| 156 | fatal("%s: sshbuf_new failed", __progname); |
| 157 | |
| 158 | if ((r = sshbuf_get_u32(req, &type)) != 0 || |
| 159 | (r = sshbuf_get_cstring(req, &provider, NULL)) != 0 || |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 160 | (r = sshbuf_get_cstring(req, &device, NULL)) != 0 || |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 161 | (r = sshbuf_get_cstring(req, &application, NULL)) != 0 || |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 162 | (r = sshbuf_get_cstring(req, &userid, NULL)) != 0 || |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 163 | (r = sshbuf_get_u8(req, &flags)) != 0 || |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 164 | (r = sshbuf_get_cstring(req, &pin, NULL)) != 0 || |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 165 | (r = sshbuf_froms(req, &challenge)) != 0) |
| 166 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
| 167 | if (sshbuf_len(req) != 0) |
| 168 | fatal("%s: trailing data in request", __progname); |
| 169 | |
| 170 | if (type > INT_MAX) |
| 171 | fatal("%s: bad type %u", __progname, type); |
| 172 | if (sshbuf_len(challenge) == 0) { |
| 173 | sshbuf_free(challenge); |
| 174 | challenge = NULL; |
| 175 | } |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 176 | null_empty(&device); |
| 177 | null_empty(&userid); |
| 178 | null_empty(&pin); |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 179 | |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 180 | if ((r = sshsk_enroll((int)type, provider, device, application, userid, |
| 181 | flags, pin, challenge, &key, attest)) != 0) { |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 182 | resp = reply_error(r, "Enrollment failed: %s", ssh_err(r)); |
| 183 | goto out; |
| 184 | } |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 185 | |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 186 | if ((resp = sshbuf_new()) == NULL) |
| 187 | fatal("%s: sshbuf_new failed", __progname); |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 188 | if ((r = sshkey_private_serialize(key, kbuf)) != 0) |
| 189 | fatal("%s: serialize private key: %s", __progname, ssh_err(r)); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 190 | if ((r = sshbuf_put_u32(resp, SSH_SK_HELPER_ENROLL)) != 0 || |
| 191 | (r = sshbuf_put_stringb(resp, kbuf)) != 0 || |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 192 | (r = sshbuf_put_stringb(resp, attest)) != 0) |
| 193 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
| 194 | |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 195 | out: |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 196 | sshkey_free(key); |
| 197 | sshbuf_free(kbuf); |
| 198 | sshbuf_free(attest); |
| 199 | sshbuf_free(challenge); |
| 200 | free(provider); |
| 201 | free(application); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 202 | if (pin != NULL) |
| 203 | freezero(pin, strlen(pin)); |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 204 | |
| 205 | return resp; |
| 206 | } |
| 207 | |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 208 | static struct sshbuf * |
| 209 | process_load_resident(struct sshbuf *req) |
| 210 | { |
| 211 | int r; |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 212 | char *provider, *pin, *device; |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 213 | struct sshbuf *kbuf, *resp; |
| 214 | struct sshkey **keys = NULL; |
| 215 | size_t nkeys = 0, i; |
| 216 | |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 217 | if ((kbuf = sshbuf_new()) == NULL) |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 218 | fatal("%s: sshbuf_new failed", __progname); |
| 219 | |
| 220 | if ((r = sshbuf_get_cstring(req, &provider, NULL)) != 0 || |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 221 | (r = sshbuf_get_cstring(req, &device, NULL)) != 0 || |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 222 | (r = sshbuf_get_cstring(req, &pin, NULL)) != 0) |
| 223 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
| 224 | if (sshbuf_len(req) != 0) |
| 225 | fatal("%s: trailing data in request", __progname); |
| 226 | |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 227 | null_empty(&device); |
| 228 | null_empty(&pin); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 229 | |
djm@openbsd.org | c312ca0 | 2020-01-06 02:00:46 +0000 | [diff] [blame] | 230 | if ((r = sshsk_load_resident(provider, device, pin, |
| 231 | &keys, &nkeys)) != 0) { |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 232 | resp = reply_error(r, " sshsk_load_resident failed: %s", |
| 233 | ssh_err(r)); |
| 234 | goto out; |
| 235 | } |
| 236 | |
| 237 | if ((resp = sshbuf_new()) == NULL) |
| 238 | fatal("%s: sshbuf_new failed", __progname); |
| 239 | |
| 240 | if ((r = sshbuf_put_u32(resp, SSH_SK_HELPER_LOAD_RESIDENT)) != 0) |
| 241 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 242 | |
| 243 | for (i = 0; i < nkeys; i++) { |
| 244 | debug("%s: key %zu %s %s", __func__, i, |
| 245 | sshkey_type(keys[i]), keys[i]->sk_application); |
| 246 | sshbuf_reset(kbuf); |
| 247 | if ((r = sshkey_private_serialize(keys[i], kbuf)) != 0) |
| 248 | fatal("%s: serialize private key: %s", |
| 249 | __progname, ssh_err(r)); |
| 250 | if ((r = sshbuf_put_stringb(resp, kbuf)) != 0 || |
| 251 | (r = sshbuf_put_cstring(resp, "")) != 0) /* comment */ |
| 252 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
| 253 | } |
| 254 | |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 255 | out: |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 256 | for (i = 0; i < nkeys; i++) |
| 257 | sshkey_free(keys[i]); |
| 258 | free(keys); |
| 259 | sshbuf_free(kbuf); |
| 260 | free(provider); |
djm@openbsd.org | c54cd18 | 2019-12-30 09:23:28 +0000 | [diff] [blame] | 261 | if (pin != NULL) |
| 262 | freezero(pin, strlen(pin)); |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 263 | return resp; |
| 264 | } |
| 265 | |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 266 | int |
| 267 | main(int argc, char **argv) |
| 268 | { |
| 269 | SyslogFacility log_facility = SYSLOG_FACILITY_AUTH; |
| 270 | LogLevel log_level = SYSLOG_LEVEL_ERROR; |
Damien Miller | f45f3a8 | 2019-12-14 07:53:11 +1100 | [diff] [blame] | 271 | struct sshbuf *req, *resp; |
djm@openbsd.org | 57b181e | 2020-01-10 23:43:26 +0000 | [diff] [blame] | 272 | int in, out, ch, r, vflag = 0; |
| 273 | u_int rtype, ll = 0; |
| 274 | uint8_t version, log_stderr = 0; |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 275 | |
| 276 | sanitise_stdfd(); |
| 277 | log_init(__progname, log_level, log_facility, log_stderr); |
| 278 | |
| 279 | while ((ch = getopt(argc, argv, "v")) != -1) { |
| 280 | switch (ch) { |
| 281 | case 'v': |
djm@openbsd.org | 57b181e | 2020-01-10 23:43:26 +0000 | [diff] [blame] | 282 | vflag = 1; |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 283 | if (log_level == SYSLOG_LEVEL_ERROR) |
| 284 | log_level = SYSLOG_LEVEL_DEBUG1; |
| 285 | else if (log_level < SYSLOG_LEVEL_DEBUG3) |
| 286 | log_level++; |
| 287 | break; |
| 288 | default: |
| 289 | fprintf(stderr, "usage: %s [-v]\n", __progname); |
| 290 | exit(1); |
| 291 | } |
| 292 | } |
djm@openbsd.org | 57b181e | 2020-01-10 23:43:26 +0000 | [diff] [blame] | 293 | log_init(__progname, log_level, log_facility, vflag); |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 294 | |
| 295 | /* |
| 296 | * Rearrange our file descriptors a little; we don't trust the |
| 297 | * providers not to fiddle with stdin/out. |
| 298 | */ |
| 299 | closefrom(STDERR_FILENO + 1); |
| 300 | if ((in = dup(STDIN_FILENO)) == -1 || (out = dup(STDOUT_FILENO)) == -1) |
| 301 | fatal("%s: dup: %s", __progname, strerror(errno)); |
| 302 | close(STDIN_FILENO); |
| 303 | close(STDOUT_FILENO); |
| 304 | sanitise_stdfd(); /* resets to /dev/null */ |
| 305 | |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 306 | if ((req = sshbuf_new()) == NULL) |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 307 | fatal("%s: sshbuf_new failed", __progname); |
| 308 | if (ssh_msg_recv(in, req) < 0) |
| 309 | fatal("ssh_msg_recv failed"); |
| 310 | close(in); |
| 311 | debug("%s: received message len %zu", __progname, sshbuf_len(req)); |
| 312 | |
| 313 | if ((r = sshbuf_get_u8(req, &version)) != 0) |
| 314 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
| 315 | if (version != SSH_SK_HELPER_VERSION) { |
| 316 | fatal("unsupported version: received %d, expected %d", |
| 317 | version, SSH_SK_HELPER_VERSION); |
| 318 | } |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 319 | |
djm@openbsd.org | 57b181e | 2020-01-10 23:43:26 +0000 | [diff] [blame] | 320 | if ((r = sshbuf_get_u32(req, &rtype)) != 0 || |
| 321 | (r = sshbuf_get_u8(req, &log_stderr)) != 0 || |
| 322 | (r = sshbuf_get_u32(req, &ll)) != 0) |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 323 | fatal("%s: buffer error: %s", __progname, ssh_err(r)); |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 324 | |
djm@openbsd.org | 57b181e | 2020-01-10 23:43:26 +0000 | [diff] [blame] | 325 | if (!vflag && log_level_name((LogLevel)ll) != NULL) |
| 326 | log_init(__progname, (LogLevel)ll, log_facility, log_stderr); |
| 327 | |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 328 | switch (rtype) { |
| 329 | case SSH_SK_HELPER_SIGN: |
| 330 | resp = process_sign(req); |
| 331 | break; |
| 332 | case SSH_SK_HELPER_ENROLL: |
| 333 | resp = process_enroll(req); |
| 334 | break; |
djm@openbsd.org | 27753a8 | 2019-12-30 09:21:59 +0000 | [diff] [blame] | 335 | case SSH_SK_HELPER_LOAD_RESIDENT: |
| 336 | resp = process_load_resident(req); |
| 337 | break; |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 338 | default: |
| 339 | fatal("%s: unsupported request type %u", __progname, rtype); |
| 340 | } |
| 341 | sshbuf_free(req); |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 342 | debug("%s: reply len %zu", __progname, sshbuf_len(resp)); |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 343 | |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 344 | if (ssh_msg_send(out, SSH_SK_HELPER_VERSION, resp) == -1) |
| 345 | fatal("ssh_msg_send failed"); |
djm@openbsd.org | 611073f | 2019-12-13 19:11:14 +0000 | [diff] [blame] | 346 | sshbuf_free(resp); |
djm@openbsd.org | 07da39f | 2019-10-31 21:22:01 +0000 | [diff] [blame] | 347 | close(out); |
| 348 | |
| 349 | return (0); |
| 350 | } |
Damien Miller | 764d51e | 2019-11-01 13:34:49 +1100 | [diff] [blame] | 351 | #else /* ENABLE_SK */ |
| 352 | #include <stdio.h> |
| 353 | |
| 354 | int |
| 355 | main(int argc, char **argv) |
| 356 | { |
| 357 | fprintf(stderr, "ssh-sk-helper: disabled at compile time\n"); |
| 358 | return -1; |
| 359 | } |
| 360 | #endif /* ENABLE_SK */ |