9 /* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */
12 * try skey authentication,
13 * return 1 on success, 0 on failure, -1 if skey is not available
17 auth_skey_password(struct passwd * pw, const char *password)
19 if (strncasecmp(password, "s/key", 5) == 0) {
20 char *skeyinfo = skey_keyinfo(pw->pw_name);
21 if (skeyinfo == NULL) {
22 debug("generating fake skeyinfo for %.100s.",
24 skeyinfo = skey_fake_keyinfo(pw->pw_name);
27 packet_send_debug(skeyinfo);
30 } else if (skey_haskey(pw->pw_name) == 0 &&
31 skey_passcheck(pw->pw_name, (char *) password) != -1) {
32 /* Authentication succeeded. */
35 /* Fall back to ordinary passwd authentication. */
39 /* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */
41 #define ROUND(x) (((x)[0] << 24) + (((x)[1]) << 16) + (((x)[2]) << 8) + \
54 if ((strlen(s) % sizeof(u_int32_t)) == 0)
55 target = strlen(s); /* Multiple of 4 */
57 target = strlen(s) - (strlen(s) % sizeof(u_int32_t));
59 for (i = 0, len = 0; len < target; len += 4)
66 skey_fake_keyinfo(char *username)
70 u_char hseed[SKEY_MAX_SEED_LEN], flg = 1, *up;
71 char pbuf[SKEY_MAX_PW_LEN+1];
72 static char skeyprompt[SKEY_MAX_CHALLENGE+1];
77 char md[SHA_DIGEST_LENGTH];
80 * Base first 4 chars of seed on hostname.
81 * Add some filler for short hostnames if necessary.
83 if (gethostname(pbuf, sizeof(pbuf)) == -1)
86 for (p = pbuf; *p && isalnum(*p); p++)
87 if (isalpha(*p) && isupper(*p))
89 if (*p && pbuf - p < 4)
90 (void)strncpy(p, "asjd", 4 - (pbuf - p));
93 /* Hash the username if possible */
94 up = malloc(SHA_DIGEST_LENGTH);
101 SHA1_Update(&ctx, username, strlen(username));
104 /* Collapse the hash */
105 ptr = hash_collapse(up);
106 memset(up, 0, strlen(up));
108 /* See if the random file's there, else use ctime */
109 if ((fd = open(_SKEY_RAND_FILE_PATH_, O_RDONLY)) != -1
110 && fstat(fd, &sb) == 0 &&
111 sb.st_size > (off_t)SKEY_MAX_SEED_LEN &&
112 lseek(fd, ptr % (sb.st_size - SKEY_MAX_SEED_LEN),
113 SEEK_SET) != -1 && read(fd, hseed,
114 SKEY_MAX_SEED_LEN) == SKEY_MAX_SEED_LEN) {
118 secretlen = SKEY_MAX_SEED_LEN;
120 } else if (!stat(_PATH_MEM, &sb) || !stat("/", &sb)) {
123 secretlen = strlen(secret);
130 /* Put that in your pipe and smoke it */
132 /* Hash secret value with username */
134 SHA1_Update(&ctx, secret, secretlen);
135 SHA1_Update(&ctx, username, strlen(username));
139 memset(secret, 0, secretlen);
141 /* Now hash the hash */
143 SHA1_Update(&ctx, up, strlen(up));
146 ptr = hash_collapse(up + 4);
148 for (i = 4; i < 9; i++) {
149 pbuf[i] = (ptr % 10) + '0';
154 /* Sequence number */
155 ptr = ((up[2] + up[3]) % 99) + 1;
157 memset(up, 0, SHA_DIGEST_LENGTH); /* SHA1 specific */
160 (void)snprintf(skeyprompt, sizeof skeyprompt,
162 SKEY_MAX_HASHNAME_LEN,
163 skey_get_algorithm(),
164 ptr, SKEY_MAX_SEED_LEN,
167 /* Base last 8 chars of seed on username */
173 /* Pad remainder with zeros */
179 *p++ = (*u++ % 10) + '0';
183 (void)snprintf(skeyprompt, sizeof skeyprompt,
185 SKEY_MAX_HASHNAME_LEN,
186 skey_get_algorithm(),
187 99, SKEY_MAX_SEED_LEN, pbuf);