1 | /* |
2 | * Copyright 1999-2017 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at |
7 | * https://www.openssl.org/source/license.html |
8 | */ |
9 | |
10 | #include <stdio.h> |
11 | #include "crypto/ctype.h" |
12 | #include "internal/cryptlib.h" |
13 | #include <openssl/asn1.h> |
14 | |
15 | static int traverse_string(const unsigned char *p, int len, int inform, |
16 | int (*rfunc) (unsigned long value, void *in), |
17 | void *arg); |
18 | static int in_utf8(unsigned long value, void *arg); |
19 | static int out_utf8(unsigned long value, void *arg); |
20 | static int type_str(unsigned long value, void *arg); |
21 | static int cpy_asc(unsigned long value, void *arg); |
22 | static int cpy_bmp(unsigned long value, void *arg); |
23 | static int cpy_univ(unsigned long value, void *arg); |
24 | static int cpy_utf8(unsigned long value, void *arg); |
25 | |
26 | /* |
27 | * These functions take a string in UTF8, ASCII or multibyte form and a mask |
28 | * of permissible ASN1 string types. It then works out the minimal type |
29 | * (using the order Numeric < Printable < IA5 < T61 < BMP < Universal < UTF8) |
30 | * and creates a string of the correct type with the supplied data. Yes this is |
31 | * horrible: it has to be :-( The 'ncopy' form checks minimum and maximum |
32 | * size limits too. |
33 | */ |
34 | |
35 | int ASN1_mbstring_copy(ASN1_STRING **out, const unsigned char *in, int len, |
36 | int inform, unsigned long mask) |
37 | { |
38 | return ASN1_mbstring_ncopy(out, in, len, inform, mask, 0, 0); |
39 | } |
40 | |
41 | int ASN1_mbstring_ncopy(ASN1_STRING **out, const unsigned char *in, int len, |
42 | int inform, unsigned long mask, |
43 | long minsize, long maxsize) |
44 | { |
45 | int str_type; |
46 | int ret; |
47 | char free_out; |
48 | int outform, outlen = 0; |
49 | ASN1_STRING *dest; |
50 | unsigned char *p; |
51 | int nchar; |
52 | char strbuf[32]; |
53 | int (*cpyfunc) (unsigned long, void *) = NULL; |
54 | if (len == -1) |
55 | len = strlen((const char *)in); |
56 | if (!mask) |
57 | mask = DIRSTRING_TYPE; |
58 | |
59 | /* First do a string check and work out the number of characters */ |
60 | switch (inform) { |
61 | |
62 | case MBSTRING_BMP: |
63 | if (len & 1) { |
64 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, |
65 | ASN1_R_INVALID_BMPSTRING_LENGTH); |
66 | return -1; |
67 | } |
68 | nchar = len >> 1; |
69 | break; |
70 | |
71 | case MBSTRING_UNIV: |
72 | if (len & 3) { |
73 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, |
74 | ASN1_R_INVALID_UNIVERSALSTRING_LENGTH); |
75 | return -1; |
76 | } |
77 | nchar = len >> 2; |
78 | break; |
79 | |
80 | case MBSTRING_UTF8: |
81 | nchar = 0; |
82 | /* This counts the characters and does utf8 syntax checking */ |
83 | ret = traverse_string(in, len, MBSTRING_UTF8, in_utf8, &nchar); |
84 | if (ret < 0) { |
85 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_INVALID_UTF8STRING); |
86 | return -1; |
87 | } |
88 | break; |
89 | |
90 | case MBSTRING_ASC: |
91 | nchar = len; |
92 | break; |
93 | |
94 | default: |
95 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_UNKNOWN_FORMAT); |
96 | return -1; |
97 | } |
98 | |
99 | if ((minsize > 0) && (nchar < minsize)) { |
100 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_STRING_TOO_SHORT); |
101 | BIO_snprintf(strbuf, sizeof(strbuf), "%ld" , minsize); |
102 | ERR_add_error_data(2, "minsize=" , strbuf); |
103 | return -1; |
104 | } |
105 | |
106 | if ((maxsize > 0) && (nchar > maxsize)) { |
107 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_STRING_TOO_LONG); |
108 | BIO_snprintf(strbuf, sizeof(strbuf), "%ld" , maxsize); |
109 | ERR_add_error_data(2, "maxsize=" , strbuf); |
110 | return -1; |
111 | } |
112 | |
113 | /* Now work out minimal type (if any) */ |
114 | if (traverse_string(in, len, inform, type_str, &mask) < 0) { |
115 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_ILLEGAL_CHARACTERS); |
116 | return -1; |
117 | } |
118 | |
119 | /* Now work out output format and string type */ |
120 | outform = MBSTRING_ASC; |
121 | if (mask & B_ASN1_NUMERICSTRING) |
122 | str_type = V_ASN1_NUMERICSTRING; |
123 | else if (mask & B_ASN1_PRINTABLESTRING) |
124 | str_type = V_ASN1_PRINTABLESTRING; |
125 | else if (mask & B_ASN1_IA5STRING) |
126 | str_type = V_ASN1_IA5STRING; |
127 | else if (mask & B_ASN1_T61STRING) |
128 | str_type = V_ASN1_T61STRING; |
129 | else if (mask & B_ASN1_BMPSTRING) { |
130 | str_type = V_ASN1_BMPSTRING; |
131 | outform = MBSTRING_BMP; |
132 | } else if (mask & B_ASN1_UNIVERSALSTRING) { |
133 | str_type = V_ASN1_UNIVERSALSTRING; |
134 | outform = MBSTRING_UNIV; |
135 | } else { |
136 | str_type = V_ASN1_UTF8STRING; |
137 | outform = MBSTRING_UTF8; |
138 | } |
139 | if (!out) |
140 | return str_type; |
141 | if (*out) { |
142 | free_out = 0; |
143 | dest = *out; |
144 | OPENSSL_free(dest->data); |
145 | dest->data = NULL; |
146 | dest->length = 0; |
147 | dest->type = str_type; |
148 | } else { |
149 | free_out = 1; |
150 | dest = ASN1_STRING_type_new(str_type); |
151 | if (dest == NULL) { |
152 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ERR_R_MALLOC_FAILURE); |
153 | return -1; |
154 | } |
155 | *out = dest; |
156 | } |
157 | /* If both the same type just copy across */ |
158 | if (inform == outform) { |
159 | if (!ASN1_STRING_set(dest, in, len)) { |
160 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ERR_R_MALLOC_FAILURE); |
161 | return -1; |
162 | } |
163 | return str_type; |
164 | } |
165 | |
166 | /* Work out how much space the destination will need */ |
167 | switch (outform) { |
168 | case MBSTRING_ASC: |
169 | outlen = nchar; |
170 | cpyfunc = cpy_asc; |
171 | break; |
172 | |
173 | case MBSTRING_BMP: |
174 | outlen = nchar << 1; |
175 | cpyfunc = cpy_bmp; |
176 | break; |
177 | |
178 | case MBSTRING_UNIV: |
179 | outlen = nchar << 2; |
180 | cpyfunc = cpy_univ; |
181 | break; |
182 | |
183 | case MBSTRING_UTF8: |
184 | outlen = 0; |
185 | traverse_string(in, len, inform, out_utf8, &outlen); |
186 | cpyfunc = cpy_utf8; |
187 | break; |
188 | } |
189 | if ((p = OPENSSL_malloc(outlen + 1)) == NULL) { |
190 | if (free_out) |
191 | ASN1_STRING_free(dest); |
192 | ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ERR_R_MALLOC_FAILURE); |
193 | return -1; |
194 | } |
195 | dest->length = outlen; |
196 | dest->data = p; |
197 | p[outlen] = 0; |
198 | traverse_string(in, len, inform, cpyfunc, &p); |
199 | return str_type; |
200 | } |
201 | |
202 | /* |
203 | * This function traverses a string and passes the value of each character to |
204 | * an optional function along with a void * argument. |
205 | */ |
206 | |
207 | static int traverse_string(const unsigned char *p, int len, int inform, |
208 | int (*rfunc) (unsigned long value, void *in), |
209 | void *arg) |
210 | { |
211 | unsigned long value; |
212 | int ret; |
213 | while (len) { |
214 | if (inform == MBSTRING_ASC) { |
215 | value = *p++; |
216 | len--; |
217 | } else if (inform == MBSTRING_BMP) { |
218 | value = *p++ << 8; |
219 | value |= *p++; |
220 | len -= 2; |
221 | } else if (inform == MBSTRING_UNIV) { |
222 | value = ((unsigned long)*p++) << 24; |
223 | value |= ((unsigned long)*p++) << 16; |
224 | value |= *p++ << 8; |
225 | value |= *p++; |
226 | len -= 4; |
227 | } else { |
228 | ret = UTF8_getc(p, len, &value); |
229 | if (ret < 0) |
230 | return -1; |
231 | len -= ret; |
232 | p += ret; |
233 | } |
234 | if (rfunc) { |
235 | ret = rfunc(value, arg); |
236 | if (ret <= 0) |
237 | return ret; |
238 | } |
239 | } |
240 | return 1; |
241 | } |
242 | |
243 | /* Various utility functions for traverse_string */ |
244 | |
245 | /* Just count number of characters */ |
246 | |
247 | static int in_utf8(unsigned long value, void *arg) |
248 | { |
249 | int *nchar; |
250 | nchar = arg; |
251 | (*nchar)++; |
252 | return 1; |
253 | } |
254 | |
255 | /* Determine size of output as a UTF8 String */ |
256 | |
257 | static int out_utf8(unsigned long value, void *arg) |
258 | { |
259 | int *outlen; |
260 | outlen = arg; |
261 | *outlen += UTF8_putc(NULL, -1, value); |
262 | return 1; |
263 | } |
264 | |
265 | /* |
266 | * Determine the "type" of a string: check each character against a supplied |
267 | * "mask". |
268 | */ |
269 | |
270 | static int type_str(unsigned long value, void *arg) |
271 | { |
272 | unsigned long types = *((unsigned long *)arg); |
273 | const int native = value > INT_MAX ? INT_MAX : ossl_fromascii(value); |
274 | |
275 | if ((types & B_ASN1_NUMERICSTRING) && !(ossl_isdigit(native) |
276 | || native == ' ')) |
277 | types &= ~B_ASN1_NUMERICSTRING; |
278 | if ((types & B_ASN1_PRINTABLESTRING) && !ossl_isasn1print(native)) |
279 | types &= ~B_ASN1_PRINTABLESTRING; |
280 | if ((types & B_ASN1_IA5STRING) && !ossl_isascii(native)) |
281 | types &= ~B_ASN1_IA5STRING; |
282 | if ((types & B_ASN1_T61STRING) && (value > 0xff)) |
283 | types &= ~B_ASN1_T61STRING; |
284 | if ((types & B_ASN1_BMPSTRING) && (value > 0xffff)) |
285 | types &= ~B_ASN1_BMPSTRING; |
286 | if (!types) |
287 | return -1; |
288 | *((unsigned long *)arg) = types; |
289 | return 1; |
290 | } |
291 | |
292 | /* Copy one byte per character ASCII like strings */ |
293 | |
294 | static int cpy_asc(unsigned long value, void *arg) |
295 | { |
296 | unsigned char **p, *q; |
297 | p = arg; |
298 | q = *p; |
299 | *q = (unsigned char)value; |
300 | (*p)++; |
301 | return 1; |
302 | } |
303 | |
304 | /* Copy two byte per character BMPStrings */ |
305 | |
306 | static int cpy_bmp(unsigned long value, void *arg) |
307 | { |
308 | unsigned char **p, *q; |
309 | p = arg; |
310 | q = *p; |
311 | *q++ = (unsigned char)((value >> 8) & 0xff); |
312 | *q = (unsigned char)(value & 0xff); |
313 | *p += 2; |
314 | return 1; |
315 | } |
316 | |
317 | /* Copy four byte per character UniversalStrings */ |
318 | |
319 | static int cpy_univ(unsigned long value, void *arg) |
320 | { |
321 | unsigned char **p, *q; |
322 | p = arg; |
323 | q = *p; |
324 | *q++ = (unsigned char)((value >> 24) & 0xff); |
325 | *q++ = (unsigned char)((value >> 16) & 0xff); |
326 | *q++ = (unsigned char)((value >> 8) & 0xff); |
327 | *q = (unsigned char)(value & 0xff); |
328 | *p += 4; |
329 | return 1; |
330 | } |
331 | |
332 | /* Copy to a UTF8String */ |
333 | |
334 | static int cpy_utf8(unsigned long value, void *arg) |
335 | { |
336 | unsigned char **p; |
337 | int ret; |
338 | p = arg; |
339 | /* We already know there is enough room so pass 0xff as the length */ |
340 | ret = UTF8_putc(*p, 0xff, value); |
341 | *p += ret; |
342 | return 1; |
343 | } |
344 | |