1 |
lefcha |
1.1 |
#include <stdio.h> |
2 |
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#include <string.h> |
3 |
lefcha |
1.2 |
#include <stdlib.h> |
4 |
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#include <limits.h> |
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lefcha |
1.1 |
|
6 |
lefcha |
1.2 |
#include "config.h" |
7 |
lefcha |
1.1 |
#include "imapfilter.h" |
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9 |
lefcha |
1.2 |
#ifdef ENCRYPTED_PASSWORDS |
10 |
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#include <openssl/evp.h> |
11 |
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#endif |
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lefcha |
1.1 |
|
13 |
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14 |
lefcha |
1.5 |
extern unsigned int flags; |
15 |
lefcha |
1.2 |
extern account_t *accounts; |
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17 |
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#ifdef ENCRYPTED_PASSWORDS |
18 |
lefcha |
1.3 |
extern char *passphr; |
19 |
lefcha |
1.2 |
#endif |
20 |
lefcha |
1.1 |
|
21 |
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/* |
22 |
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* Get password from user interactively. |
23 |
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*/ |
24 |
lefcha |
1.9 |
void |
25 |
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get_password(char *passwd, size_t pwlen) |
26 |
lefcha |
1.1 |
{ |
27 |
lefcha |
1.9 |
char *c; |
28 |
lefcha |
1.2 |
|
29 |
lefcha |
1.9 |
tty_disable_echo(); |
30 |
lefcha |
1.8 |
|
31 |
lefcha |
1.9 |
if (fgets(passwd, pwlen, stdin)) |
32 |
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if ((c = strchr(passwd, '\n'))) |
33 |
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*c = '\0'; |
34 |
lefcha |
1.2 |
|
35 |
lefcha |
1.9 |
tty_restore(); |
36 |
lefcha |
1.1 |
|
37 |
lefcha |
1.9 |
putchar('\n'); |
38 |
lefcha |
1.1 |
} |
39 |
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40 |
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41 |
lefcha |
1.2 |
#ifdef ENCRYPTED_PASSWORDS |
42 |
lefcha |
1.1 |
/* |
43 |
lefcha |
1.9 |
* Encrypt and Base64 encode passwords. Append the MD5 checksum of the |
44 |
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* passwords before encrypting them. |
45 |
lefcha |
1.1 |
*/ |
46 |
lefcha |
1.9 |
int |
47 |
lefcha |
1.12 |
encrypt_passwords(FILE * fd, account_t ** accts) |
48 |
lefcha |
1.1 |
{ |
49 |
lefcha |
1.13 |
int i, n; |
50 |
lefcha |
1.9 |
unsigned char iv[EVP_MAX_IV_LENGTH]; |
51 |
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unsigned char *key; |
52 |
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unsigned char buf[ENCRYPTION_BUF]; |
53 |
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unsigned char ebuf[ENCRYPTION_BUF]; |
54 |
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unsigned char bbuf[ENCRYPTION_BUF]; |
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unsigned char mdv[EVP_MAX_MD_SIZE]; |
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int mdl, ebufl, bbufl; |
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EVP_CIPHER_CTX ctx; |
58 |
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EVP_MD_CTX mdctx; |
59 |
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EVP_ENCODE_CTX bctx; |
60 |
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61 |
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key = (unsigned char *)smalloc(EVP_MAX_KEY_LENGTH); |
62 |
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63 |
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srandom(time(NULL)); |
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/* Initialization vector. */ |
66 |
lefcha |
1.13 |
n = 1 + random() % 100000000, 10; |
67 |
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snprintf(iv, EVP_MAX_IV_LENGTH, "%08d", n); |
68 |
lefcha |
1.11 |
fprintf(fd, "%s\n", iv); |
69 |
lefcha |
1.9 |
|
70 |
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EVP_CIPHER_CTX_init(&ctx); |
71 |
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|
72 |
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EVP_BytesToKey(EVP_bf_cbc(), EVP_md5(), NULL, passphr, strlen(passphr), 1, |
73 |
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key, NULL); |
74 |
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75 |
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EVP_DigestInit(&mdctx, EVP_md5()); |
76 |
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EVP_EncryptInit(&ctx, EVP_bf_cbc(), key, iv); |
77 |
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EVP_EncodeInit(&bctx); |
78 |
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79 |
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for (i = 0; accts[i] != NULL; i++) { |
80 |
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snprintf(buf, ENCRYPTION_BUF, "%s %s %s\n", accts[i]->server, |
81 |
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accts[i]->username, accts[i]->password); |
82 |
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EVP_DigestUpdate(&mdctx, buf, strlen(buf)); |
83 |
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EVP_EncryptUpdate(&ctx, ebuf, &ebufl, buf, strlen(buf)); |
84 |
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EVP_EncodeUpdate(&bctx, bbuf, &bbufl, ebuf, ebufl); |
85 |
lefcha |
1.2 |
|
86 |
lefcha |
1.9 |
fwrite(bbuf, sizeof(char), bbufl, fd); |
87 |
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} |
88 |
lefcha |
1.6 |
|
89 |
lefcha |
1.9 |
EVP_DigestFinal(&mdctx, mdv, &mdl); |
90 |
lefcha |
1.2 |
|
91 |
lefcha |
1.9 |
xstrncpy(buf, ".\n", ENCRYPTION_BUF - 1); |
92 |
lefcha |
1.8 |
|
93 |
lefcha |
1.9 |
/* MD5 checksum of data. */ |
94 |
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for (i = 0; i < mdl; i++) |
95 |
lefcha |
1.11 |
snprintf(2 + buf + i * 2, ENCRYPTION_BUF - 3 - i * 2, "%02x", |
96 |
lefcha |
1.9 |
mdv[i]); |
97 |
lefcha |
1.8 |
|
98 |
lefcha |
1.9 |
EVP_EncryptUpdate(&ctx, ebuf, &ebufl, buf, strlen(buf)); |
99 |
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EVP_EncodeUpdate(&bctx, bbuf, &bbufl, ebuf, ebufl); |
100 |
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fwrite(bbuf, sizeof(char), bbufl, fd); |
101 |
lefcha |
1.8 |
|
102 |
lefcha |
1.9 |
EVP_EncryptFinal(&ctx, ebuf, &ebufl); |
103 |
lefcha |
1.11 |
|
104 |
lefcha |
1.9 |
EVP_EncodeUpdate(&bctx, bbuf, &bbufl, ebuf, ebufl); |
105 |
lefcha |
1.11 |
fwrite(bbuf, sizeof(char), bbufl, fd); |
106 |
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107 |
lefcha |
1.9 |
EVP_EncodeFinal(&bctx, bbuf, &bbufl); |
108 |
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fwrite(bbuf, sizeof(char), bbufl, fd); |
109 |
lefcha |
1.8 |
|
110 |
lefcha |
1.9 |
EVP_CIPHER_CTX_cleanup(&ctx); |
111 |
lefcha |
1.2 |
|
112 |
lefcha |
1.9 |
return 0; |
113 |
lefcha |
1.1 |
} |
114 |
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116 |
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/* |
117 |
lefcha |
1.3 |
* Decode (Base64) passwords, decrypt them and verify the MD5 checksum. |
118 |
lefcha |
1.1 |
*/ |
119 |
lefcha |
1.9 |
int |
120 |
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decrypt_passwords(unsigned char **buf, FILE * fd) |
121 |
lefcha |
1.1 |
{ |
122 |
lefcha |
1.9 |
int i, j; |
123 |
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unsigned char iv[EVP_MAX_IV_LENGTH]; |
124 |
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unsigned char *key; |
125 |
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unsigned char *c; |
126 |
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unsigned char ebuf[LINE_MAX]; |
127 |
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unsigned char bbuf[LINE_MAX]; |
128 |
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unsigned char mdv[EVP_MAX_MD_SIZE]; |
129 |
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unsigned char mdc[EVP_MAX_MD_SIZE * 2 + 1]; |
130 |
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int mdl, bufl, ebufl; |
131 |
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EVP_CIPHER_CTX *ctx; |
132 |
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EVP_MD_CTX mdctx; |
133 |
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EVP_ENCODE_CTX bctx; |
134 |
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135 |
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j = 1; |
136 |
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137 |
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c = *buf = (unsigned char *)smalloc(DECRYPTION_BUF * sizeof(char)); |
138 |
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key = (unsigned char *)smalloc(EVP_MAX_KEY_LENGTH); |
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ctx = (EVP_CIPHER_CTX *) smalloc(sizeof(EVP_CIPHER_CTX)); |
140 |
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141 |
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fgets(bbuf, LINE_MAX, fd); |
142 |
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143 |
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memcpy(iv, bbuf, EVP_MAX_IV_LENGTH); |
144 |
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145 |
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EVP_CIPHER_CTX_init(ctx); |
146 |
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147 |
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EVP_BytesToKey(EVP_bf_cbc(), EVP_md5(), NULL, passphr, strlen(passphr), |
148 |
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1, key, NULL); |
149 |
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150 |
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EVP_DecryptInit(ctx, EVP_bf_cbc(), key, iv); |
151 |
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EVP_DecodeInit(&bctx); |
152 |
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153 |
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while (fgets(bbuf, LINE_MAX, fd)) { |
154 |
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EVP_DecodeUpdate(&bctx, ebuf, &ebufl, bbuf, strlen(bbuf)); |
155 |
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if (!EVP_DecryptUpdate(ctx, c, &bufl, ebuf, ebufl)) |
156 |
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goto fail; |
157 |
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158 |
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c += bufl; |
159 |
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*c = '\0'; |
160 |
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161 |
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if (c - *buf > DECRYPTION_BUF * j - 64) { |
162 |
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i = c - *buf; |
163 |
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*buf = (char *)srealloc(*buf, DECRYPTION_BUF * ++j); |
164 |
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c = *buf + i; |
165 |
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*c = '\0'; |
166 |
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} |
167 |
lefcha |
1.6 |
} |
168 |
lefcha |
1.8 |
|
169 |
lefcha |
1.9 |
EVP_DecodeFinal(&bctx, ebuf, &ebufl); |
170 |
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if (!EVP_DecryptFinal(ctx, c, &bufl)) |
171 |
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goto fail; |
172 |
lefcha |
1.2 |
|
173 |
lefcha |
1.9 |
c += bufl; |
174 |
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*c = '\0'; |
175 |
lefcha |
1.6 |
|
176 |
lefcha |
1.9 |
/* Calculate the MD5 checksum and check if it is correct. */ |
177 |
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if (!(c = strstr(*buf, "\n.\n"))) |
178 |
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goto fail; |
179 |
lefcha |
1.6 |
|
180 |
lefcha |
1.9 |
EVP_DigestInit(&mdctx, EVP_md5()); |
181 |
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EVP_DigestUpdate(&mdctx, *buf, c - *buf + 1); |
182 |
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EVP_DigestFinal(&mdctx, mdv, &mdl); |
183 |
lefcha |
1.8 |
|
184 |
lefcha |
1.9 |
for (i = 0; i < mdl; i++) |
185 |
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snprintf(mdc + i * 2, EVP_MAX_MD_SIZE * 2 + 1 - i * 2, "%02x", |
186 |
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mdv[i]); |
187 |
lefcha |
1.8 |
|
188 |
lefcha |
1.9 |
c += 3; |
189 |
lefcha |
1.6 |
|
190 |
lefcha |
1.9 |
if (strncmp(c, mdc, 32)) |
191 |
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goto fail; |
192 |
lefcha |
1.2 |
|
193 |
lefcha |
1.9 |
EVP_CIPHER_CTX_cleanup(ctx); |
194 |
lefcha |
1.8 |
|
195 |
lefcha |
1.9 |
sfree(key); |
196 |
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sfree(ctx); |
197 |
lefcha |
1.8 |
|
198 |
lefcha |
1.9 |
return 0; |
199 |
lefcha |
1.6 |
|
200 |
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fail: |
201 |
lefcha |
1.9 |
error("Wrong master passphrase.\n"); |
202 |
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EVP_CIPHER_CTX_cleanup(ctx); |
203 |
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sfree(*buf); |
204 |
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sfree(key); |
205 |
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sfree(ctx); |
206 |
lefcha |
1.8 |
|
207 |
lefcha |
1.9 |
return ERROR_DECRYPT; |
208 |
lefcha |
1.2 |
} |
209 |
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210 |
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211 |
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/* |
212 |
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* Interactive encrypted passwords editor. |
213 |
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*/ |
214 |
lefcha |
1.9 |
void |
215 |
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password_editor(void) |
216 |
lefcha |
1.2 |
{ |
217 |
lefcha |
1.12 |
int i, q, n, pn; |
218 |
lefcha |
1.9 |
char buf[LINE_MAX]; |
219 |
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char *c; |
220 |
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char *p[2]; |
221 |
lefcha |
1.12 |
account_t *a, **accts; |
222 |
lefcha |
1.9 |
|
223 |
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if (!(flags & FLAG_BLANK_PASSWORD)) { |
224 |
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error("no candidate passwords for encryption found\n"); |
225 |
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return; |
226 |
lefcha |
1.2 |
} |
227 |
lefcha |
1.12 |
q = pn = 0; |
228 |
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229 |
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for (a = accounts; a != NULL; a = a->next) |
230 |
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if (a->passwdattr == PASSWORD_NONE || |
231 |
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a->passwdattr == PASSWORD_ENCRYPTED) |
232 |
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pn++; |
233 |
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234 |
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accts = (account_t **) xmalloc((pn + 1) * sizeof(account_t *)); |
235 |
lefcha |
1.9 |
|
236 |
lefcha |
1.12 |
memset(accts, 0, (pn + 1) * sizeof(account_t *)); |
237 |
lefcha |
1.9 |
|
238 |
lefcha |
1.12 |
for (i = 0, a = accounts; a != NULL; a = a->next) { |
239 |
lefcha |
1.9 |
if (a->passwdattr == PASSWORD_NONE || |
240 |
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a->passwdattr == PASSWORD_ENCRYPTED) |
241 |
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accts[i++] = a; |
242 |
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} |
243 |
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244 |
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do { |
245 |
lefcha |
1.10 |
printf("cmd: "); |
246 |
lefcha |
1.9 |
fgets(buf, LINE_MAX, stdin); |
247 |
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c = buf; |
248 |
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for (;; c++) { |
249 |
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if (*c == ' ' || *c == '\t') |
250 |
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continue; |
251 |
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else if (*c == '?' || *c == 'h') |
252 |
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printf("c\tclear a password entry\n" |
253 |
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"e\tedit a password entry\n" |
254 |
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"h\thelp\n" |
255 |
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"l\tlist entries\n" |
256 |
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"p\tchange master password\n" |
257 |
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"q\tquit without saving\n" |
258 |
lefcha |
1.12 |
"w\tsave changes\n" |
259 |
lefcha |
1.9 |
"x\tsave and exit\n"); |
260 |
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else if (*c == 'q') |
261 |
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q = 1; |
262 |
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else if (*c == 'l') |
263 |
lefcha |
1.12 |
for (i = 0; i < pn; i++) |
264 |
lefcha |
1.9 |
printf("%d %s %s %s\n", i + 1, |
265 |
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accts[i]->server, |
266 |
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accts[i]->username, |
267 |
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accts[i]->password); |
268 |
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else if (*c == 'e') { |
269 |
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n = atoi(++c); |
270 |
lefcha |
1.11 |
if (n == 0 || n < 1 || |
271 |
lefcha |
1.12 |
n > pn || |
272 |
lefcha |
1.9 |
accts[n - 1] == NULL) |
273 |
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break; |
274 |
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accts[n - 1]->password[0] = '\0'; |
275 |
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printf("Enter new password: "); |
276 |
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if (fgets(accts[n - 1]->password, PASSWORD_LEN, |
277 |
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stdin) && |
278 |
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(c = strchr(accts[n - 1]->password, '\n'))) |
279 |
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*c = '\0'; |
280 |
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} else if (*c == 'c') { |
281 |
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n = atoi(++c); |
282 |
lefcha |
1.11 |
if (n == 0 || n < 1 || |
283 |
lefcha |
1.12 |
n > pn || |
284 |
lefcha |
1.9 |
accts[n - 1] == NULL) |
285 |
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break; |
286 |
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accts[n - 1]->password[0] = '\0'; |
287 |
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} else if (*c == 'p') { |
288 |
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p[0] = (char *)smalloc(PASSPHRASE_LEN); |
289 |
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p[1] = (char *)smalloc(PASSPHRASE_LEN); |
290 |
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do { |
291 |
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for (i = 0; i < 2; i++) { |
292 |
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printf("Enter %snew master " |
293 |
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"password: ", |
294 |
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i ? "again " : ""); |
295 |
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get_password(p[i], |
296 |
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PASSPHRASE_LEN); |
297 |
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} |
298 |
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} while (strcmp(p[0], p[1])); |
299 |
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xstrncpy(passphr, p[0], PASSPHRASE_LEN - 1); |
300 |
|
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sfree(p[0]); |
301 |
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sfree(p[1]); |
302 |
lefcha |
1.12 |
} else if (*c == 'w' || *c == 's') { |
303 |
lefcha |
1.9 |
store_passwords(accts); |
304 |
|
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} else if (*c == 'x') { |
305 |
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store_passwords(accts); |
306 |
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q = 1; |
307 |
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} else |
308 |
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break; |
309 |
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} |
310 |
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} while (!q); |
311 |
lefcha |
1.1 |
} |
312 |
lefcha |
1.9 |
#endif /* ENCRYPTED_PASSWORDS */ |