]>
Commit | Line | Data |
---|---|---|
5260325f | 1 | #include "includes.h" |
2 | ||
91b8065d | 3 | #ifdef SKEY |
8efc0c15 | 4 | RCSID("$Id$"); |
5 | ||
6 | #include "ssh.h" | |
57112b5a | 7 | #include "packet.h" |
8 | ||
aa3378df | 9 | #ifdef HAVE_OPENSSL |
2598df62 | 10 | #include <openssl/sha.h> |
aa3378df | 11 | #endif |
12 | #ifdef HAVE_SSL | |
2598df62 | 13 | #include <ssl/sha.h> |
aa3378df | 14 | #endif |
8efc0c15 | 15 | |
16 | /* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */ | |
17 | ||
57112b5a | 18 | /* |
19 | * try skey authentication, | |
20 | * return 1 on success, 0 on failure, -1 if skey is not available | |
21 | */ | |
22 | ||
23 | int | |
24 | auth_skey_password(struct passwd * pw, const char *password) | |
25 | { | |
26 | if (strncasecmp(password, "s/key", 5) == 0) { | |
27 | char *skeyinfo = skey_keyinfo(pw->pw_name); | |
28 | if (skeyinfo == NULL) { | |
29 | debug("generating fake skeyinfo for %.100s.", | |
30 | pw->pw_name); | |
31 | skeyinfo = skey_fake_keyinfo(pw->pw_name); | |
32 | } | |
33 | if (skeyinfo != NULL) | |
34 | packet_send_debug(skeyinfo); | |
35 | /* Try again. */ | |
36 | return 0; | |
37 | } else if (skey_haskey(pw->pw_name) == 0 && | |
38 | skey_passcheck(pw->pw_name, (char *) password) != -1) { | |
39 | /* Authentication succeeded. */ | |
40 | return 1; | |
41 | } | |
42 | /* Fall back to ordinary passwd authentication. */ | |
43 | return -1; | |
44 | } | |
59625cbb | 45 | |
46 | /* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */ | |
8efc0c15 | 47 | |
48 | #define ROUND(x) (((x)[0] << 24) + (((x)[1]) << 16) + (((x)[2]) << 8) + \ | |
49 | ((x)[3])) | |
50 | ||
51 | /* | |
52 | * hash_collapse() | |
53 | */ | |
54 | static u_int32_t | |
55 | hash_collapse(s) | |
56 | u_char *s; | |
57 | { | |
58 | int len, target; | |
59 | u_int32_t i; | |
60 | ||
61 | if ((strlen(s) % sizeof(u_int32_t)) == 0) | |
62 | target = strlen(s); /* Multiple of 4 */ | |
63 | else | |
64 | target = strlen(s) - (strlen(s) % sizeof(u_int32_t)); | |
65 | ||
66 | for (i = 0, len = 0; len < target; len += 4) | |
67 | i ^= ROUND(s + len); | |
68 | ||
69 | return i; | |
70 | } | |
5260325f | 71 | |
8efc0c15 | 72 | char * |
73 | skey_fake_keyinfo(char *username) | |
74 | { | |
75 | int i; | |
76 | u_int ptr; | |
77 | u_char hseed[SKEY_MAX_SEED_LEN], flg = 1, *up; | |
78 | char pbuf[SKEY_MAX_PW_LEN+1]; | |
79 | static char skeyprompt[SKEY_MAX_CHALLENGE+1]; | |
80 | char *secret = NULL; | |
81 | size_t secretlen = 0; | |
2598df62 | 82 | SHA_CTX ctx; |
8efc0c15 | 83 | char *p, *u; |
2598df62 | 84 | char md[SHA_DIGEST_LENGTH]; |
8efc0c15 | 85 | |
86 | /* | |
87 | * Base first 4 chars of seed on hostname. | |
88 | * Add some filler for short hostnames if necessary. | |
89 | */ | |
90 | if (gethostname(pbuf, sizeof(pbuf)) == -1) | |
91 | *(p = pbuf) = '.'; | |
92 | else | |
93 | for (p = pbuf; *p && isalnum(*p); p++) | |
94 | if (isalpha(*p) && isupper(*p)) | |
95 | *p = tolower(*p); | |
96 | if (*p && pbuf - p < 4) | |
97 | (void)strncpy(p, "asjd", 4 - (pbuf - p)); | |
98 | pbuf[4] = '\0'; | |
99 | ||
100 | /* Hash the username if possible */ | |
2598df62 | 101 | up = malloc(SHA_DIGEST_LENGTH); |
102 | if (up != NULL) { | |
8efc0c15 | 103 | struct stat sb; |
104 | time_t t; | |
105 | int fd; | |
106 | ||
2598df62 | 107 | SHA1_Init(&ctx); |
108 | SHA1_Update(&ctx, username, strlen(username)); | |
109 | SHA1_End(&ctx, up); | |
110 | ||
8efc0c15 | 111 | /* Collapse the hash */ |
112 | ptr = hash_collapse(up); | |
113 | memset(up, 0, strlen(up)); | |
114 | ||
115 | /* See if the random file's there, else use ctime */ | |
116 | if ((fd = open(_SKEY_RAND_FILE_PATH_, O_RDONLY)) != -1 | |
117 | && fstat(fd, &sb) == 0 && | |
118 | sb.st_size > (off_t)SKEY_MAX_SEED_LEN && | |
119 | lseek(fd, ptr % (sb.st_size - SKEY_MAX_SEED_LEN), | |
120 | SEEK_SET) != -1 && read(fd, hseed, | |
121 | SKEY_MAX_SEED_LEN) == SKEY_MAX_SEED_LEN) { | |
122 | close(fd); | |
a408af76 | 123 | fd = -1; |
8efc0c15 | 124 | secret = hseed; |
125 | secretlen = SKEY_MAX_SEED_LEN; | |
126 | flg = 0; | |
127 | } else if (!stat(_PATH_MEM, &sb) || !stat("/", &sb)) { | |
128 | t = sb.st_ctime; | |
129 | secret = ctime(&t); | |
130 | secretlen = strlen(secret); | |
131 | flg = 0; | |
132 | } | |
a408af76 | 133 | if (fd != -1) |
134 | close(fd); | |
8efc0c15 | 135 | } |
136 | ||
137 | /* Put that in your pipe and smoke it */ | |
138 | if (flg == 0) { | |
139 | /* Hash secret value with username */ | |
2598df62 | 140 | SHA1_Init(&ctx); |
141 | SHA1_Update(&ctx, secret, secretlen); | |
142 | SHA1_Update(&ctx, username, strlen(username)); | |
143 | SHA1_End(&ctx, up); | |
8efc0c15 | 144 | |
145 | /* Zero out */ | |
146 | memset(secret, 0, secretlen); | |
147 | ||
148 | /* Now hash the hash */ | |
2598df62 | 149 | SHA1_Init(&ctx); |
150 | SHA1_Update(&ctx, up, strlen(up)); | |
151 | SHA1_End(&ctx, up); | |
8efc0c15 | 152 | |
153 | ptr = hash_collapse(up + 4); | |
154 | ||
155 | for (i = 4; i < 9; i++) { | |
156 | pbuf[i] = (ptr % 10) + '0'; | |
157 | ptr /= 10; | |
158 | } | |
159 | pbuf[i] = '\0'; | |
160 | ||
161 | /* Sequence number */ | |
162 | ptr = ((up[2] + up[3]) % 99) + 1; | |
163 | ||
2598df62 | 164 | memset(up, 0, SHA_DIGEST_LENGTH); /* SHA1 specific */ |
8efc0c15 | 165 | free(up); |
166 | ||
167 | (void)snprintf(skeyprompt, sizeof skeyprompt, | |
168 | "otp-%.*s %d %.*s", | |
169 | SKEY_MAX_HASHNAME_LEN, | |
170 | skey_get_algorithm(), | |
171 | ptr, SKEY_MAX_SEED_LEN, | |
172 | pbuf); | |
173 | } else { | |
174 | /* Base last 8 chars of seed on username */ | |
175 | u = username; | |
176 | i = 8; | |
177 | p = &pbuf[4]; | |
178 | do { | |
179 | if (*u == 0) { | |
180 | /* Pad remainder with zeros */ | |
181 | while (--i >= 0) | |
182 | *p++ = '0'; | |
183 | break; | |
184 | } | |
185 | ||
186 | *p++ = (*u++ % 10) + '0'; | |
187 | } while (--i != 0); | |
188 | pbuf[12] = '\0'; | |
189 | ||
190 | (void)snprintf(skeyprompt, sizeof skeyprompt, | |
191 | "otp-%.*s %d %.*s", | |
192 | SKEY_MAX_HASHNAME_LEN, | |
193 | skey_get_algorithm(), | |
194 | 99, SKEY_MAX_SEED_LEN, pbuf); | |
195 | } | |
196 | return skeyprompt; | |
197 | } | |
91b8065d | 198 | |
5260325f | 199 | #endif /* SKEY */ |