| #include "includes.h" |
| |
| #ifdef SKEY |
| RCSID("$Id: auth-skey.c,v 1.4 1999/12/01 16:54:35 markus Exp $"); |
| |
| #include "ssh.h" |
| #include "packet.h" |
| |
| #ifdef HAVE_OPENSSL |
| #include <openssl/sha1.h> |
| #endif |
| #ifdef HAVE_SSL |
| #include <ssl/sha1.h> |
| #endif |
| |
| /* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */ |
| |
| /* |
| * try skey authentication, |
| * return 1 on success, 0 on failure, -1 if skey is not available |
| */ |
| |
| int |
| auth_skey_password(struct passwd * pw, const char *password) |
| { |
| if (strncasecmp(password, "s/key", 5) == 0) { |
| char *skeyinfo = skey_keyinfo(pw->pw_name); |
| if (skeyinfo == NULL) { |
| debug("generating fake skeyinfo for %.100s.", |
| pw->pw_name); |
| skeyinfo = skey_fake_keyinfo(pw->pw_name); |
| } |
| if (skeyinfo != NULL) |
| packet_send_debug(skeyinfo); |
| /* Try again. */ |
| return 0; |
| } else if (skey_haskey(pw->pw_name) == 0 && |
| skey_passcheck(pw->pw_name, (char *) password) != -1) { |
| /* Authentication succeeded. */ |
| return 1; |
| } |
| /* Fall back to ordinary passwd authentication. */ |
| return -1; |
| } |
| |
| + /* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */ |
| |
| #define ROUND(x) (((x)[0] << 24) + (((x)[1]) << 16) + (((x)[2]) << 8) + \ |
| ((x)[3])) |
| |
| /* |
| * hash_collapse() |
| */ |
| static u_int32_t |
| hash_collapse(s) |
| u_char *s; |
| { |
| int len, target; |
| u_int32_t i; |
| |
| if ((strlen(s) % sizeof(u_int32_t)) == 0) |
| target = strlen(s); /* Multiple of 4 */ |
| else |
| target = strlen(s) - (strlen(s) % sizeof(u_int32_t)); |
| |
| for (i = 0, len = 0; len < target; len += 4) |
| i ^= ROUND(s + len); |
| |
| return i; |
| } |
| |
| char * |
| skey_fake_keyinfo(char *username) |
| { |
| int i; |
| u_int ptr; |
| u_char hseed[SKEY_MAX_SEED_LEN], flg = 1, *up; |
| char pbuf[SKEY_MAX_PW_LEN+1]; |
| static char skeyprompt[SKEY_MAX_CHALLENGE+1]; |
| char *secret = NULL; |
| size_t secretlen = 0; |
| SHA1_CTX ctx; |
| char *p, *u; |
| |
| /* |
| * Base first 4 chars of seed on hostname. |
| * Add some filler for short hostnames if necessary. |
| */ |
| if (gethostname(pbuf, sizeof(pbuf)) == -1) |
| *(p = pbuf) = '.'; |
| else |
| for (p = pbuf; *p && isalnum(*p); p++) |
| if (isalpha(*p) && isupper(*p)) |
| *p = tolower(*p); |
| if (*p && pbuf - p < 4) |
| (void)strncpy(p, "asjd", 4 - (pbuf - p)); |
| pbuf[4] = '\0'; |
| |
| /* Hash the username if possible */ |
| if ((up = SHA1Data(username, strlen(username), NULL)) != NULL) { |
| struct stat sb; |
| time_t t; |
| int fd; |
| |
| /* Collapse the hash */ |
| ptr = hash_collapse(up); |
| memset(up, 0, strlen(up)); |
| |
| /* See if the random file's there, else use ctime */ |
| if ((fd = open(_SKEY_RAND_FILE_PATH_, O_RDONLY)) != -1 |
| && fstat(fd, &sb) == 0 && |
| sb.st_size > (off_t)SKEY_MAX_SEED_LEN && |
| lseek(fd, ptr % (sb.st_size - SKEY_MAX_SEED_LEN), |
| SEEK_SET) != -1 && read(fd, hseed, |
| SKEY_MAX_SEED_LEN) == SKEY_MAX_SEED_LEN) { |
| close(fd); |
| secret = hseed; |
| secretlen = SKEY_MAX_SEED_LEN; |
| flg = 0; |
| } else if (!stat(_PATH_MEM, &sb) || !stat("/", &sb)) { |
| t = sb.st_ctime; |
| secret = ctime(&t); |
| secretlen = strlen(secret); |
| flg = 0; |
| } |
| } |
| |
| /* Put that in your pipe and smoke it */ |
| if (flg == 0) { |
| /* Hash secret value with username */ |
| SHA1Init(&ctx); |
| SHA1Update(&ctx, secret, secretlen); |
| SHA1Update(&ctx, username, strlen(username)); |
| SHA1End(&ctx, up); |
| |
| /* Zero out */ |
| memset(secret, 0, secretlen); |
| |
| /* Now hash the hash */ |
| SHA1Init(&ctx); |
| SHA1Update(&ctx, up, strlen(up)); |
| SHA1End(&ctx, up); |
| |
| ptr = hash_collapse(up + 4); |
| |
| for (i = 4; i < 9; i++) { |
| pbuf[i] = (ptr % 10) + '0'; |
| ptr /= 10; |
| } |
| pbuf[i] = '\0'; |
| |
| /* Sequence number */ |
| ptr = ((up[2] + up[3]) % 99) + 1; |
| |
| memset(up, 0, 20); /* SHA1 specific */ |
| free(up); |
| |
| (void)snprintf(skeyprompt, sizeof skeyprompt, |
| "otp-%.*s %d %.*s", |
| SKEY_MAX_HASHNAME_LEN, |
| skey_get_algorithm(), |
| ptr, SKEY_MAX_SEED_LEN, |
| pbuf); |
| } else { |
| /* Base last 8 chars of seed on username */ |
| u = username; |
| i = 8; |
| p = &pbuf[4]; |
| do { |
| if (*u == 0) { |
| /* Pad remainder with zeros */ |
| while (--i >= 0) |
| *p++ = '0'; |
| break; |
| } |
| |
| *p++ = (*u++ % 10) + '0'; |
| } while (--i != 0); |
| pbuf[12] = '\0'; |
| |
| (void)snprintf(skeyprompt, sizeof skeyprompt, |
| "otp-%.*s %d %.*s", |
| SKEY_MAX_HASHNAME_LEN, |
| skey_get_algorithm(), |
| 99, SKEY_MAX_SEED_LEN, pbuf); |
| } |
| return skeyprompt; |
| } |
| |
| #endif /* SKEY */ |