1 |
#include <stdio.h> |
2 |
#include <string.h> |
3 |
#include <stdlib.h> |
4 |
#include <limits.h> |
5 |
|
6 |
#include "config.h" |
7 |
#include "imapfilter.h" |
8 |
#include "data.h" |
9 |
|
10 |
#ifdef ENCRYPTED_PASSWORDS |
11 |
#include <openssl/evp.h> |
12 |
#endif |
13 |
|
14 |
|
15 |
extern unsigned int flags; |
16 |
extern account_t *accounts; |
17 |
|
18 |
#ifdef ENCRYPTED_PASSWORDS |
19 |
extern char *passphr; |
20 |
#endif |
21 |
|
22 |
/* |
23 |
* Get password from user interactively. |
24 |
*/ |
25 |
void get_password(char *passwd, size_t pwlen) |
26 |
{ |
27 |
char *c; |
28 |
|
29 |
tty_disable_echo(); |
30 |
|
31 |
if (fgets(passwd, pwlen, stdin)) |
32 |
if ((c = strchr(passwd, '\n'))) |
33 |
*c = 0; |
34 |
|
35 |
tty_restore(); |
36 |
|
37 |
putchar('\n'); |
38 |
} |
39 |
|
40 |
|
41 |
#ifdef ENCRYPTED_PASSWORDS |
42 |
/* |
43 |
* Encrypt and Base64 encode passwords. Append the MD5 checksum of the passwords |
44 |
* before encrypting them. |
45 |
*/ |
46 |
int encrypt_passwords(FILE *fd, account_t *accts[]) |
47 |
{ |
48 |
int i; |
49 |
char *c; |
50 |
unsigned char iv[EVP_MAX_IV_LENGTH]; |
51 |
unsigned char *key; |
52 |
unsigned char buf[ENCRYPTION_BUF]; |
53 |
unsigned char ebuf[ENCRYPTION_BUF]; |
54 |
unsigned char bbuf[ENCRYPTION_BUF]; |
55 |
unsigned char mdv[EVP_MAX_MD_SIZE]; |
56 |
int mdl, ebufl, bbufl; |
57 |
EVP_CIPHER_CTX ctx; |
58 |
EVP_MD_CTX mdctx; |
59 |
EVP_ENCODE_CTX bctx; |
60 |
|
61 |
key = (unsigned char *) smalloc(EVP_MAX_KEY_LENGTH); |
62 |
|
63 |
srandom(time(NULL)); |
64 |
|
65 |
c = ultostr(1 + random() % 100000000, 10); |
66 |
memset(iv, '0', EVP_MAX_IV_LENGTH); |
67 |
memcpy(iv + 8 - strlen(c), c, min(8, strlen(c))); |
68 |
|
69 |
fprintf(fd, "%.8s\n", iv); |
70 |
|
71 |
EVP_CIPHER_CTX_init(&ctx); |
72 |
|
73 |
EVP_BytesToKey(EVP_bf_cbc(), EVP_md5(), NULL, passphr, strlen(passphr), 1, |
74 |
key, NULL); |
75 |
|
76 |
EVP_DigestInit(&mdctx, EVP_md5()); |
77 |
EVP_EncryptInit(&ctx, EVP_bf_cbc(), key, iv); |
78 |
EVP_EncodeInit(&bctx); |
79 |
|
80 |
for (i = 0; accts[i]; i++) { |
81 |
snprintf(buf, ENCRYPTION_BUF, "%s %s %s\n", accts[i]->server, accts[i]->username, |
82 |
accts[i]->password); |
83 |
|
84 |
EVP_DigestUpdate(&mdctx, buf, strlen(buf)); |
85 |
EVP_EncryptUpdate(&ctx, ebuf, &ebufl, buf, strlen(buf)); |
86 |
EVP_EncodeUpdate(&bctx, bbuf, &bbufl, ebuf, ebufl); |
87 |
|
88 |
fwrite(bbuf, sizeof(char), bbufl, fd); |
89 |
} |
90 |
|
91 |
EVP_DigestFinal(&mdctx, mdv, &mdl); |
92 |
|
93 |
xstrncpy(buf, ".\n", ENCRYPTION_BUF - 1); |
94 |
|
95 |
for (i = 0; i < mdl; i++) |
96 |
snprintf(2 + buf + i * 2, ENCRYPTION_BUF - i * 2, "%02x", mdv[i]); |
97 |
|
98 |
EVP_EncryptUpdate(&ctx, ebuf, &ebufl, buf, strlen(buf)); |
99 |
EVP_EncodeUpdate(&bctx, bbuf, &bbufl, ebuf, ebufl); |
100 |
fwrite(bbuf, sizeof(char), bbufl, fd); |
101 |
|
102 |
EVP_EncryptFinal(&ctx, ebuf, &ebufl); |
103 |
EVP_EncodeUpdate(&bctx, bbuf, &bbufl, ebuf, ebufl); |
104 |
EVP_EncodeFinal(&bctx, bbuf, &bbufl); |
105 |
|
106 |
fwrite(bbuf, sizeof(char), bbufl, fd); |
107 |
|
108 |
EVP_CIPHER_CTX_cleanup(&ctx); |
109 |
|
110 |
return 0; |
111 |
} |
112 |
|
113 |
|
114 |
/* |
115 |
* Decode (Base64) passwords, decrypt them and verify the MD5 checksum. |
116 |
*/ |
117 |
int decrypt_passwords(unsigned char **buf, FILE *fd) |
118 |
{ |
119 |
int i, j = 1; |
120 |
unsigned char iv[EVP_MAX_IV_LENGTH]; |
121 |
unsigned char *key; |
122 |
unsigned char *c; |
123 |
unsigned char ebuf[LINE_MAX]; |
124 |
unsigned char bbuf[LINE_MAX]; |
125 |
unsigned char mdv[EVP_MAX_MD_SIZE]; |
126 |
unsigned char mdc[EVP_MAX_MD_SIZE * 2 + 1]; |
127 |
int mdl, bufl, ebufl; |
128 |
EVP_CIPHER_CTX *ctx; |
129 |
EVP_MD_CTX mdctx; |
130 |
EVP_ENCODE_CTX bctx; |
131 |
|
132 |
c = *buf = (unsigned char *) smalloc(DECRYPTION_BUF * sizeof(char)); |
133 |
key = (unsigned char *) smalloc(EVP_MAX_KEY_LENGTH); |
134 |
ctx = (EVP_CIPHER_CTX *) smalloc(sizeof(EVP_CIPHER_CTX)); |
135 |
|
136 |
fgets(bbuf, LINE_MAX, fd); |
137 |
|
138 |
memcpy(iv, bbuf, EVP_MAX_IV_LENGTH); |
139 |
|
140 |
EVP_CIPHER_CTX_init(ctx); |
141 |
|
142 |
EVP_BytesToKey(EVP_bf_cbc(), EVP_md5(), NULL, passphr, strlen(passphr), |
143 |
1, key, NULL); |
144 |
|
145 |
EVP_DecryptInit(ctx, EVP_bf_cbc(), key, iv); |
146 |
EVP_DecodeInit(&bctx); |
147 |
|
148 |
while (fgets(bbuf, LINE_MAX, fd)) { |
149 |
EVP_DecodeUpdate(&bctx, ebuf, &ebufl, bbuf, strlen(bbuf)); |
150 |
if (!EVP_DecryptUpdate(ctx, c, &bufl, ebuf, ebufl)) { |
151 |
error("Wrong master passphrase.\n"); |
152 |
sfree(*buf); |
153 |
sfree(key); |
154 |
sfree(ctx); |
155 |
return 1; |
156 |
} |
157 |
|
158 |
c += bufl; |
159 |
*c = 0; |
160 |
|
161 |
if (c - *buf < DECRYPTION_BUF * j - 64) |
162 |
*buf = (char *) srealloc(*buf, DECRYPTION_BUF * ++j); |
163 |
} |
164 |
|
165 |
EVP_DecodeFinal(&bctx, ebuf, &ebufl); |
166 |
if (!EVP_DecryptFinal(ctx, c, &bufl)) { |
167 |
fprintf(stderr, "Wrong master passphrase.\n"); |
168 |
sfree(*buf); |
169 |
sfree(key); |
170 |
sfree(ctx); |
171 |
return 1; |
172 |
} |
173 |
|
174 |
c += bufl; |
175 |
*c = 0; |
176 |
|
177 |
if ((c = strstr(*buf, "\n.\n"))) { |
178 |
EVP_DigestInit(&mdctx, EVP_md5()); |
179 |
EVP_DigestUpdate(&mdctx, *buf, c - *buf + 1); |
180 |
EVP_DigestFinal(&mdctx, mdv, &mdl); |
181 |
|
182 |
for (i = 0; i < mdl; i++) |
183 |
snprintf(mdc + i * 2, EVP_MAX_MD_SIZE * 2 + 1 - i * 2, "%02x", mdv[i]); |
184 |
|
185 |
*c = 0; |
186 |
} else { |
187 |
sfree(*buf); |
188 |
sfree(key); |
189 |
sfree(ctx); |
190 |
return 1; |
191 |
} |
192 |
|
193 |
EVP_CIPHER_CTX_cleanup(ctx); |
194 |
|
195 |
sfree(key); |
196 |
sfree(ctx); |
197 |
|
198 |
return 0; |
199 |
} |
200 |
|
201 |
|
202 |
/* |
203 |
* Interactive encrypted passwords editor. |
204 |
*/ |
205 |
void password_editor(void) |
206 |
{ |
207 |
int i, q, n; |
208 |
char buf[LINE_MAX]; |
209 |
char *c; |
210 |
char *p[2]; |
211 |
account_t *a, *accts[EDITOR_PASSWORDS_MAX]; |
212 |
|
213 |
if (!(flags & FLAG_BLANK_PASSWORD)) { |
214 |
error("imapfilter: no candidate passwords for encryption found\n"); |
215 |
return; |
216 |
} |
217 |
|
218 |
q = 0; |
219 |
|
220 |
memset(accts, 0, EDITOR_PASSWORDS_MAX); |
221 |
|
222 |
for (i = 0, a = accounts; i < EDITOR_PASSWORDS_MAX - 1 && a; a = a->next) { |
223 |
if (a->passwdattr == PASSWORD_NONE || |
224 |
a->passwdattr == PASSWORD_ENCRYPTED) |
225 |
accts[i++] = a; |
226 |
} |
227 |
|
228 |
do { |
229 |
printf("command: "); |
230 |
fgets(buf, LINE_MAX, stdin); |
231 |
c = buf; |
232 |
for (;; c++) { |
233 |
if (*c == ' ' || *c == '\t') |
234 |
continue; |
235 |
else if (*c == '?' || *c == 'h') |
236 |
printf("c clear a password entry\n" |
237 |
"e edit a password entry\n" |
238 |
"h help\n" |
239 |
"l list entries\n" |
240 |
"p change master password\n" |
241 |
"q quit without saving\n" |
242 |
"x save and exit\n"); |
243 |
else if (*c == 'q') |
244 |
q = 1; |
245 |
else if (*c == 'l') |
246 |
for (i = 0; accts[i]; i++) |
247 |
printf("%d %s %s %s\n", i + 1, accts[i]->server, |
248 |
accts[i]->username, accts[i]->password); |
249 |
else if (*c == 'e') { |
250 |
n = atoi(++c); |
251 |
if (!n || n < 1 || n > 128 || !accts[n - 1]) |
252 |
break; |
253 |
accts[n - 1]->password[0] = 0; |
254 |
printf("Enter new password: "); |
255 |
if (fgets(accts[n - 1]->password, PASSWORD_LEN, stdin)) |
256 |
if ((c = strchr(accts[n - 1]->password, '\n'))) |
257 |
*c = 0; |
258 |
} else if (*c == 'c') { |
259 |
n = atoi(++c); |
260 |
if (!n || n < 1 || n > 128 || !accts[n - 1]) |
261 |
break; |
262 |
accts[n - 1]->password[0] = 0; |
263 |
} else if (*c == 'p') { |
264 |
p[0] = (char *) smalloc(PASSPHRASE_LEN); |
265 |
p[1] = (char *) smalloc(PASSPHRASE_LEN); |
266 |
do { |
267 |
for (i = 0; i < 2; i++) { |
268 |
printf("Enter %snew master password: ", |
269 |
i ? "again " : ""); |
270 |
get_password(p[i], PASSPHRASE_LEN); |
271 |
} |
272 |
} while (strcmp(p[0], p[1])); |
273 |
xstrncpy(passphr, p[0], PASSPHRASE_LEN - 1); |
274 |
sfree(p[0]); |
275 |
sfree(p[1]); |
276 |
} else if (*c == 'x') { |
277 |
store_passwords(accts); |
278 |
q = 1; |
279 |
} else |
280 |
break; |
281 |
} |
282 |
} while (!q); |
283 |
} |
284 |
#endif |