asn1_gen.c revision 284285 
1/* asn1_gen.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 2002.
5 */
6/* ====================================================================
7 * Copyright (c) 2002 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include "cryptlib.h"
61#include <openssl/asn1.h>
62#include <openssl/x509v3.h>
63
64#define ASN1_GEN_FLAG           0x10000
65#define ASN1_GEN_FLAG_IMP       (ASN1_GEN_FLAG|1)
66#define ASN1_GEN_FLAG_EXP       (ASN1_GEN_FLAG|2)
67#define ASN1_GEN_FLAG_TAG       (ASN1_GEN_FLAG|3)
68#define ASN1_GEN_FLAG_BITWRAP   (ASN1_GEN_FLAG|4)
69#define ASN1_GEN_FLAG_OCTWRAP   (ASN1_GEN_FLAG|5)
70#define ASN1_GEN_FLAG_SEQWRAP   (ASN1_GEN_FLAG|6)
71#define ASN1_GEN_FLAG_SETWRAP   (ASN1_GEN_FLAG|7)
72#define ASN1_GEN_FLAG_FORMAT    (ASN1_GEN_FLAG|8)
73
74#define ASN1_GEN_STR(str,val)   {str, sizeof(str) - 1, val}
75
76#define ASN1_FLAG_EXP_MAX       20
77/* Maximum number of nested sequences */
78#define ASN1_GEN_SEQ_MAX_DEPTH  50
79
80/* Input formats */
81
82/* ASCII: default */
83#define ASN1_GEN_FORMAT_ASCII   1
84/* UTF8 */
85#define ASN1_GEN_FORMAT_UTF8    2
86/* Hex */
87#define ASN1_GEN_FORMAT_HEX     3
88/* List of bits */
89#define ASN1_GEN_FORMAT_BITLIST 4
90
91struct tag_name_st {
92    const char *strnam;
93    int len;
94    int tag;
95};
96
97typedef struct {
98    int exp_tag;
99    int exp_class;
100    int exp_constructed;
101    int exp_pad;
102    long exp_len;
103} tag_exp_type;
104
105typedef struct {
106    int imp_tag;
107    int imp_class;
108    int utype;
109    int format;
110    const char *str;
111    tag_exp_type exp_list[ASN1_FLAG_EXP_MAX];
112    int exp_count;
113} tag_exp_arg;
114
115static ASN1_TYPE *generate_v3(char *str, X509V3_CTX *cnf, int depth,
116                              int *perr);
117static int bitstr_cb(const char *elem, int len, void *bitstr);
118static int asn1_cb(const char *elem, int len, void *bitstr);
119static int append_exp(tag_exp_arg *arg, int exp_tag, int exp_class,
120                      int exp_constructed, int exp_pad, int imp_ok);
121static int parse_tagging(const char *vstart, int vlen, int *ptag,
122                         int *pclass);
123static ASN1_TYPE *asn1_multi(int utype, const char *section, X509V3_CTX *cnf,
124                             int depth, int *perr);
125static ASN1_TYPE *asn1_str2type(const char *str, int format, int utype);
126static int asn1_str2tag(const char *tagstr, int len);
127
128ASN1_TYPE *ASN1_generate_nconf(char *str, CONF *nconf)
129{
130    X509V3_CTX cnf;
131
132    if (!nconf)
133        return ASN1_generate_v3(str, NULL);
134
135    X509V3_set_nconf(&cnf, nconf);
136    return ASN1_generate_v3(str, &cnf);
137}
138
139ASN1_TYPE *ASN1_generate_v3(char *str, X509V3_CTX *cnf)
140{
141    int err = 0;
142    ASN1_TYPE *ret = generate_v3(str, cnf, 0, &err);
143    if (err)
144        ASN1err(ASN1_F_ASN1_GENERATE_V3, err);
145    return ret;
146}
147
148static ASN1_TYPE *generate_v3(char *str, X509V3_CTX *cnf, int depth,
149                              int *perr)
150{
151    ASN1_TYPE *ret;
152    tag_exp_arg asn1_tags;
153    tag_exp_type *etmp;
154
155    int i, len;
156
157    unsigned char *orig_der = NULL, *new_der = NULL;
158    const unsigned char *cpy_start;
159    unsigned char *p;
160    const unsigned char *cp;
161    int cpy_len;
162    long hdr_len;
163    int hdr_constructed = 0, hdr_tag, hdr_class;
164    int r;
165
166    asn1_tags.imp_tag = -1;
167    asn1_tags.imp_class = -1;
168    asn1_tags.format = ASN1_GEN_FORMAT_ASCII;
169    asn1_tags.exp_count = 0;
170    if (CONF_parse_list(str, ',', 1, asn1_cb, &asn1_tags) != 0) {
171        *perr = ASN1_R_UNKNOWN_TAG;
172        return NULL;
173    }
174
175    if ((asn1_tags.utype == V_ASN1_SEQUENCE)
176        || (asn1_tags.utype == V_ASN1_SET)) {
177        if (!cnf) {
178            *perr = ASN1_R_SEQUENCE_OR_SET_NEEDS_CONFIG;
179            return NULL;
180        }
181        if (depth >= ASN1_GEN_SEQ_MAX_DEPTH) {
182            *perr = ASN1_R_ILLEGAL_NESTED_TAGGING;
183            return NULL;
184        }
185        ret = asn1_multi(asn1_tags.utype, asn1_tags.str, cnf, depth, perr);
186    } else
187        ret = asn1_str2type(asn1_tags.str, asn1_tags.format, asn1_tags.utype);
188
189    if (!ret)
190        return NULL;
191
192    /* If no tagging return base type */
193    if ((asn1_tags.imp_tag == -1) && (asn1_tags.exp_count == 0))
194        return ret;
195
196    /* Generate the encoding */
197    cpy_len = i2d_ASN1_TYPE(ret, &orig_der);
198    ASN1_TYPE_free(ret);
199    ret = NULL;
200    /* Set point to start copying for modified encoding */
201    cpy_start = orig_der;
202
203    /* Do we need IMPLICIT tagging? */
204    if (asn1_tags.imp_tag != -1) {
205        /* If IMPLICIT we will replace the underlying tag */
206        /* Skip existing tag+len */
207        r = ASN1_get_object(&cpy_start, &hdr_len, &hdr_tag, &hdr_class,
208                            cpy_len);
209        if (r & 0x80)
210            goto err;
211        /* Update copy length */
212        cpy_len -= cpy_start - orig_der;
213        /*
214         * For IMPLICIT tagging the length should match the original length
215         * and constructed flag should be consistent.
216         */
217        if (r & 0x1) {
218            /* Indefinite length constructed */
219            hdr_constructed = 2;
220            hdr_len = 0;
221        } else
222            /* Just retain constructed flag */
223            hdr_constructed = r & V_ASN1_CONSTRUCTED;
224        /*
225         * Work out new length with IMPLICIT tag: ignore constructed because
226         * it will mess up if indefinite length
227         */
228        len = ASN1_object_size(0, hdr_len, asn1_tags.imp_tag);
229    } else
230        len = cpy_len;
231
232    /* Work out length in any EXPLICIT, starting from end */
233
234    for (i = 0, etmp = asn1_tags.exp_list + asn1_tags.exp_count - 1;
235         i < asn1_tags.exp_count; i++, etmp--) {
236        /* Content length: number of content octets + any padding */
237        len += etmp->exp_pad;
238        etmp->exp_len = len;
239        /* Total object length: length including new header */
240        len = ASN1_object_size(0, len, etmp->exp_tag);
241    }
242
243    /* Allocate buffer for new encoding */
244
245    new_der = OPENSSL_malloc(len);
246    if (!new_der)
247        goto err;
248
249    /* Generate tagged encoding */
250
251    p = new_der;
252
253    /* Output explicit tags first */
254
255    for (i = 0, etmp = asn1_tags.exp_list; i < asn1_tags.exp_count;
256         i++, etmp++) {
257        ASN1_put_object(&p, etmp->exp_constructed, etmp->exp_len,
258                        etmp->exp_tag, etmp->exp_class);
259        if (etmp->exp_pad)
260            *p++ = 0;
261    }
262
263    /* If IMPLICIT, output tag */
264
265    if (asn1_tags.imp_tag != -1) {
266        if (asn1_tags.imp_class == V_ASN1_UNIVERSAL
267            && (asn1_tags.imp_tag == V_ASN1_SEQUENCE
268                || asn1_tags.imp_tag == V_ASN1_SET))
269            hdr_constructed = V_ASN1_CONSTRUCTED;
270        ASN1_put_object(&p, hdr_constructed, hdr_len,
271                        asn1_tags.imp_tag, asn1_tags.imp_class);
272    }
273
274    /* Copy across original encoding */
275    memcpy(p, cpy_start, cpy_len);
276
277    cp = new_der;
278
279    /* Obtain new ASN1_TYPE structure */
280    ret = d2i_ASN1_TYPE(NULL, &cp, len);
281
282 err:
283    if (orig_der)
284        OPENSSL_free(orig_der);
285    if (new_der)
286        OPENSSL_free(new_der);
287
288    return ret;
289
290}
291
292static int asn1_cb(const char *elem, int len, void *bitstr)
293{
294    tag_exp_arg *arg = bitstr;
295    int i;
296    int utype;
297    int vlen = 0;
298    const char *p, *vstart = NULL;
299
300    int tmp_tag, tmp_class;
301
302    if (elem == NULL)
303        return -1;
304
305    for (i = 0, p = elem; i < len; p++, i++) {
306        /* Look for the ':' in name value pairs */
307        if (*p == ':') {
308            vstart = p + 1;
309            vlen = len - (vstart - elem);
310            len = p - elem;
311            break;
312        }
313    }
314
315    utype = asn1_str2tag(elem, len);
316
317    if (utype == -1) {
318        ASN1err(ASN1_F_ASN1_CB, ASN1_R_UNKNOWN_TAG);
319        ERR_add_error_data(2, "tag=", elem);
320        return -1;
321    }
322
323    /* If this is not a modifier mark end of string and exit */
324    if (!(utype & ASN1_GEN_FLAG)) {
325        arg->utype = utype;
326        arg->str = vstart;
327        /* If no value and not end of string, error */
328        if (!vstart && elem[len]) {
329            ASN1err(ASN1_F_ASN1_CB, ASN1_R_MISSING_VALUE);
330            return -1;
331        }
332        return 0;
333    }
334
335    switch (utype) {
336
337    case ASN1_GEN_FLAG_IMP:
338        /* Check for illegal multiple IMPLICIT tagging */
339        if (arg->imp_tag != -1) {
340            ASN1err(ASN1_F_ASN1_CB, ASN1_R_ILLEGAL_NESTED_TAGGING);
341            return -1;
342        }
343        if (!parse_tagging(vstart, vlen, &arg->imp_tag, &arg->imp_class))
344            return -1;
345        break;
346
347    case ASN1_GEN_FLAG_EXP:
348
349        if (!parse_tagging(vstart, vlen, &tmp_tag, &tmp_class))
350            return -1;
351        if (!append_exp(arg, tmp_tag, tmp_class, 1, 0, 0))
352            return -1;
353        break;
354
355    case ASN1_GEN_FLAG_SEQWRAP:
356        if (!append_exp(arg, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL, 1, 0, 1))
357            return -1;
358        break;
359
360    case ASN1_GEN_FLAG_SETWRAP:
361        if (!append_exp(arg, V_ASN1_SET, V_ASN1_UNIVERSAL, 1, 0, 1))
362            return -1;
363        break;
364
365    case ASN1_GEN_FLAG_BITWRAP:
366        if (!append_exp(arg, V_ASN1_BIT_STRING, V_ASN1_UNIVERSAL, 0, 1, 1))
367            return -1;
368        break;
369
370    case ASN1_GEN_FLAG_OCTWRAP:
371        if (!append_exp(arg, V_ASN1_OCTET_STRING, V_ASN1_UNIVERSAL, 0, 0, 1))
372            return -1;
373        break;
374
375    case ASN1_GEN_FLAG_FORMAT:
376        if (!vstart) {
377            ASN1err(ASN1_F_ASN1_CB, ASN1_R_UNKNOWN_FORMAT);
378            return -1;
379        }
380        if (!strncmp(vstart, "ASCII", 5))
381            arg->format = ASN1_GEN_FORMAT_ASCII;
382        else if (!strncmp(vstart, "UTF8", 4))
383            arg->format = ASN1_GEN_FORMAT_UTF8;
384        else if (!strncmp(vstart, "HEX", 3))
385            arg->format = ASN1_GEN_FORMAT_HEX;
386        else if (!strncmp(vstart, "BITLIST", 7))
387            arg->format = ASN1_GEN_FORMAT_BITLIST;
388        else {
389            ASN1err(ASN1_F_ASN1_CB, ASN1_R_UNKOWN_FORMAT);
390            return -1;
391        }
392        break;
393
394    }
395
396    return 1;
397
398}
399
400static int parse_tagging(const char *vstart, int vlen, int *ptag, int *pclass)
401{
402    char erch[2];
403    long tag_num;
404    char *eptr;
405    if (!vstart)
406        return 0;
407    tag_num = strtoul(vstart, &eptr, 10);
408    /* Check we haven't gone past max length: should be impossible */
409    if (eptr && *eptr && (eptr > vstart + vlen))
410        return 0;
411    if (tag_num < 0) {
412        ASN1err(ASN1_F_PARSE_TAGGING, ASN1_R_INVALID_NUMBER);
413        return 0;
414    }
415    *ptag = tag_num;
416    /* If we have non numeric characters, parse them */
417    if (eptr)
418        vlen -= eptr - vstart;
419    else
420        vlen = 0;
421    if (vlen) {
422        switch (*eptr) {
423
424        case 'U':
425            *pclass = V_ASN1_UNIVERSAL;
426            break;
427
428        case 'A':
429            *pclass = V_ASN1_APPLICATION;
430            break;
431
432        case 'P':
433            *pclass = V_ASN1_PRIVATE;
434            break;
435
436        case 'C':
437            *pclass = V_ASN1_CONTEXT_SPECIFIC;
438            break;
439
440        default:
441            erch[0] = *eptr;
442            erch[1] = 0;
443            ASN1err(ASN1_F_PARSE_TAGGING, ASN1_R_INVALID_MODIFIER);
444            ERR_add_error_data(2, "Char=", erch);
445            return 0;
446            break;
447
448        }
449    } else
450        *pclass = V_ASN1_CONTEXT_SPECIFIC;
451
452    return 1;
453
454}
455
456/* Handle multiple types: SET and SEQUENCE */
457
458static ASN1_TYPE *asn1_multi(int utype, const char *section, X509V3_CTX *cnf,
459                             int depth, int *perr)
460{
461    ASN1_TYPE *ret = NULL;
462    STACK_OF(ASN1_TYPE) *sk = NULL;
463    STACK_OF(CONF_VALUE) *sect = NULL;
464    unsigned char *der = NULL;
465    int derlen;
466    int i;
467    sk = sk_ASN1_TYPE_new_null();
468    if (!sk)
469        goto bad;
470    if (section) {
471        if (!cnf)
472            goto bad;
473        sect = X509V3_get_section(cnf, (char *)section);
474        if (!sect)
475            goto bad;
476        for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
477            ASN1_TYPE *typ =
478                generate_v3(sk_CONF_VALUE_value(sect, i)->value, cnf,
479                            depth + 1, perr);
480            if (!typ)
481                goto bad;
482            if (!sk_ASN1_TYPE_push(sk, typ))
483                goto bad;
484        }
485    }
486
487    /*
488     * Now we has a STACK of the components, convert to the correct form
489     */
490
491    if (utype == V_ASN1_SET)
492        derlen = i2d_ASN1_SET_ANY(sk, &der);
493    else
494        derlen = i2d_ASN1_SEQUENCE_ANY(sk, &der);
495
496    if (derlen < 0)
497        goto bad;
498
499    if (!(ret = ASN1_TYPE_new()))
500        goto bad;
501
502    if (!(ret->value.asn1_string = ASN1_STRING_type_new(utype)))
503        goto bad;
504
505    ret->type = utype;
506
507    ret->value.asn1_string->data = der;
508    ret->value.asn1_string->length = derlen;
509
510    der = NULL;
511
512 bad:
513
514    if (der)
515        OPENSSL_free(der);
516
517    if (sk)
518        sk_ASN1_TYPE_pop_free(sk, ASN1_TYPE_free);
519    if (sect)
520        X509V3_section_free(cnf, sect);
521
522    return ret;
523}
524
525static int append_exp(tag_exp_arg *arg, int exp_tag, int exp_class,
526                      int exp_constructed, int exp_pad, int imp_ok)
527{
528    tag_exp_type *exp_tmp;
529    /* Can only have IMPLICIT if permitted */
530    if ((arg->imp_tag != -1) && !imp_ok) {
531        ASN1err(ASN1_F_APPEND_EXP, ASN1_R_ILLEGAL_IMPLICIT_TAG);
532        return 0;
533    }
534
535    if (arg->exp_count == ASN1_FLAG_EXP_MAX) {
536        ASN1err(ASN1_F_APPEND_EXP, ASN1_R_DEPTH_EXCEEDED);
537        return 0;
538    }
539
540    exp_tmp = &arg->exp_list[arg->exp_count++];
541
542    /*
543     * If IMPLICIT set tag to implicit value then reset implicit tag since it
544     * has been used.
545     */
546    if (arg->imp_tag != -1) {
547        exp_tmp->exp_tag = arg->imp_tag;
548        exp_tmp->exp_class = arg->imp_class;
549        arg->imp_tag = -1;
550        arg->imp_class = -1;
551    } else {
552        exp_tmp->exp_tag = exp_tag;
553        exp_tmp->exp_class = exp_class;
554    }
555    exp_tmp->exp_constructed = exp_constructed;
556    exp_tmp->exp_pad = exp_pad;
557
558    return 1;
559}
560
561static int asn1_str2tag(const char *tagstr, int len)
562{
563    unsigned int i;
564    static const struct tag_name_st *tntmp, tnst[] = {
565        ASN1_GEN_STR("BOOL", V_ASN1_BOOLEAN),
566        ASN1_GEN_STR("BOOLEAN", V_ASN1_BOOLEAN),
567        ASN1_GEN_STR("NULL", V_ASN1_NULL),
568        ASN1_GEN_STR("INT", V_ASN1_INTEGER),
569        ASN1_GEN_STR("INTEGER", V_ASN1_INTEGER),
570        ASN1_GEN_STR("ENUM", V_ASN1_ENUMERATED),
571        ASN1_GEN_STR("ENUMERATED", V_ASN1_ENUMERATED),
572        ASN1_GEN_STR("OID", V_ASN1_OBJECT),
573        ASN1_GEN_STR("OBJECT", V_ASN1_OBJECT),
574        ASN1_GEN_STR("UTCTIME", V_ASN1_UTCTIME),
575        ASN1_GEN_STR("UTC", V_ASN1_UTCTIME),
576        ASN1_GEN_STR("GENERALIZEDTIME", V_ASN1_GENERALIZEDTIME),
577        ASN1_GEN_STR("GENTIME", V_ASN1_GENERALIZEDTIME),
578        ASN1_GEN_STR("OCT", V_ASN1_OCTET_STRING),
579        ASN1_GEN_STR("OCTETSTRING", V_ASN1_OCTET_STRING),
580        ASN1_GEN_STR("BITSTR", V_ASN1_BIT_STRING),
581        ASN1_GEN_STR("BITSTRING", V_ASN1_BIT_STRING),
582        ASN1_GEN_STR("UNIVERSALSTRING", V_ASN1_UNIVERSALSTRING),
583        ASN1_GEN_STR("UNIV", V_ASN1_UNIVERSALSTRING),
584        ASN1_GEN_STR("IA5", V_ASN1_IA5STRING),
585        ASN1_GEN_STR("IA5STRING", V_ASN1_IA5STRING),
586        ASN1_GEN_STR("UTF8", V_ASN1_UTF8STRING),
587        ASN1_GEN_STR("UTF8String", V_ASN1_UTF8STRING),
588        ASN1_GEN_STR("BMP", V_ASN1_BMPSTRING),
589        ASN1_GEN_STR("BMPSTRING", V_ASN1_BMPSTRING),
590        ASN1_GEN_STR("VISIBLESTRING", V_ASN1_VISIBLESTRING),
591        ASN1_GEN_STR("VISIBLE", V_ASN1_VISIBLESTRING),
592        ASN1_GEN_STR("PRINTABLESTRING", V_ASN1_PRINTABLESTRING),
593        ASN1_GEN_STR("PRINTABLE", V_ASN1_PRINTABLESTRING),
594        ASN1_GEN_STR("T61", V_ASN1_T61STRING),
595        ASN1_GEN_STR("T61STRING", V_ASN1_T61STRING),
596        ASN1_GEN_STR("TELETEXSTRING", V_ASN1_T61STRING),
597        ASN1_GEN_STR("GeneralString", V_ASN1_GENERALSTRING),
598        ASN1_GEN_STR("GENSTR", V_ASN1_GENERALSTRING),
599        ASN1_GEN_STR("NUMERIC", V_ASN1_NUMERICSTRING),
600        ASN1_GEN_STR("NUMERICSTRING", V_ASN1_NUMERICSTRING),
601
602        /* Special cases */
603        ASN1_GEN_STR("SEQUENCE", V_ASN1_SEQUENCE),
604        ASN1_GEN_STR("SEQ", V_ASN1_SEQUENCE),
605        ASN1_GEN_STR("SET", V_ASN1_SET),
606        /* type modifiers */
607        /* Explicit tag */
608        ASN1_GEN_STR("EXP", ASN1_GEN_FLAG_EXP),
609        ASN1_GEN_STR("EXPLICIT", ASN1_GEN_FLAG_EXP),
610        /* Implicit tag */
611        ASN1_GEN_STR("IMP", ASN1_GEN_FLAG_IMP),
612        ASN1_GEN_STR("IMPLICIT", ASN1_GEN_FLAG_IMP),
613        /* OCTET STRING wrapper */
614        ASN1_GEN_STR("OCTWRAP", ASN1_GEN_FLAG_OCTWRAP),
615        /* SEQUENCE wrapper */
616        ASN1_GEN_STR("SEQWRAP", ASN1_GEN_FLAG_SEQWRAP),
617        /* SET wrapper */
618        ASN1_GEN_STR("SETWRAP", ASN1_GEN_FLAG_SETWRAP),
619        /* BIT STRING wrapper */
620        ASN1_GEN_STR("BITWRAP", ASN1_GEN_FLAG_BITWRAP),
621        ASN1_GEN_STR("FORM", ASN1_GEN_FLAG_FORMAT),
622        ASN1_GEN_STR("FORMAT", ASN1_GEN_FLAG_FORMAT),
623    };
624
625    if (len == -1)
626        len = strlen(tagstr);
627
628    tntmp = tnst;
629    for (i = 0; i < sizeof(tnst) / sizeof(struct tag_name_st); i++, tntmp++) {
630        if ((len == tntmp->len) && !strncmp(tntmp->strnam, tagstr, len))
631            return tntmp->tag;
632    }
633
634    return -1;
635}
636
637static ASN1_TYPE *asn1_str2type(const char *str, int format, int utype)
638{
639    ASN1_TYPE *atmp = NULL;
640
641    CONF_VALUE vtmp;
642
643    unsigned char *rdata;
644    long rdlen;
645
646    int no_unused = 1;
647
648    if (!(atmp = ASN1_TYPE_new())) {
649        ASN1err(ASN1_F_ASN1_STR2TYPE, ERR_R_MALLOC_FAILURE);
650        return NULL;
651    }
652
653    if (!str)
654        str = "";
655
656    switch (utype) {
657
658    case V_ASN1_NULL:
659        if (str && *str) {
660            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_NULL_VALUE);
661            goto bad_form;
662        }
663        break;
664
665    case V_ASN1_BOOLEAN:
666        if (format != ASN1_GEN_FORMAT_ASCII) {
667            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_NOT_ASCII_FORMAT);
668            goto bad_form;
669        }
670        vtmp.name = NULL;
671        vtmp.section = NULL;
672        vtmp.value = (char *)str;
673        if (!X509V3_get_value_bool(&vtmp, &atmp->value.boolean)) {
674            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_BOOLEAN);
675            goto bad_str;
676        }
677        break;
678
679    case V_ASN1_INTEGER:
680    case V_ASN1_ENUMERATED:
681        if (format != ASN1_GEN_FORMAT_ASCII) {
682            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_INTEGER_NOT_ASCII_FORMAT);
683            goto bad_form;
684        }
685        if (!(atmp->value.integer = s2i_ASN1_INTEGER(NULL, (char *)str))) {
686            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_INTEGER);
687            goto bad_str;
688        }
689        break;
690
691    case V_ASN1_OBJECT:
692        if (format != ASN1_GEN_FORMAT_ASCII) {
693            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_OBJECT_NOT_ASCII_FORMAT);
694            goto bad_form;
695        }
696        if (!(atmp->value.object = OBJ_txt2obj(str, 0))) {
697            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_OBJECT);
698            goto bad_str;
699        }
700        break;
701
702    case V_ASN1_UTCTIME:
703    case V_ASN1_GENERALIZEDTIME:
704        if (format != ASN1_GEN_FORMAT_ASCII) {
705            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_TIME_NOT_ASCII_FORMAT);
706            goto bad_form;
707        }
708        if (!(atmp->value.asn1_string = ASN1_STRING_new())) {
709            ASN1err(ASN1_F_ASN1_STR2TYPE, ERR_R_MALLOC_FAILURE);
710            goto bad_str;
711        }
712        if (!ASN1_STRING_set(atmp->value.asn1_string, str, -1)) {
713            ASN1err(ASN1_F_ASN1_STR2TYPE, ERR_R_MALLOC_FAILURE);
714            goto bad_str;
715        }
716        atmp->value.asn1_string->type = utype;
717        if (!ASN1_TIME_check(atmp->value.asn1_string)) {
718            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_TIME_VALUE);
719            goto bad_str;
720        }
721
722        break;
723
724    case V_ASN1_BMPSTRING:
725    case V_ASN1_PRINTABLESTRING:
726    case V_ASN1_IA5STRING:
727    case V_ASN1_T61STRING:
728    case V_ASN1_UTF8STRING:
729    case V_ASN1_VISIBLESTRING:
730    case V_ASN1_UNIVERSALSTRING:
731    case V_ASN1_GENERALSTRING:
732    case V_ASN1_NUMERICSTRING:
733
734        if (format == ASN1_GEN_FORMAT_ASCII)
735            format = MBSTRING_ASC;
736        else if (format == ASN1_GEN_FORMAT_UTF8)
737            format = MBSTRING_UTF8;
738        else {
739            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_FORMAT);
740            goto bad_form;
741        }
742
743        if (ASN1_mbstring_copy(&atmp->value.asn1_string, (unsigned char *)str,
744                               -1, format, ASN1_tag2bit(utype)) <= 0) {
745            ASN1err(ASN1_F_ASN1_STR2TYPE, ERR_R_MALLOC_FAILURE);
746            goto bad_str;
747        }
748
749        break;
750
751    case V_ASN1_BIT_STRING:
752
753    case V_ASN1_OCTET_STRING:
754
755        if (!(atmp->value.asn1_string = ASN1_STRING_new())) {
756            ASN1err(ASN1_F_ASN1_STR2TYPE, ERR_R_MALLOC_FAILURE);
757            goto bad_form;
758        }
759
760        if (format == ASN1_GEN_FORMAT_HEX) {
761
762            if (!(rdata = string_to_hex((char *)str, &rdlen))) {
763                ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_HEX);
764                goto bad_str;
765            }
766
767            atmp->value.asn1_string->data = rdata;
768            atmp->value.asn1_string->length = rdlen;
769            atmp->value.asn1_string->type = utype;
770
771        } else if (format == ASN1_GEN_FORMAT_ASCII)
772            ASN1_STRING_set(atmp->value.asn1_string, str, -1);
773        else if ((format == ASN1_GEN_FORMAT_BITLIST)
774                 && (utype == V_ASN1_BIT_STRING)) {
775            if (!CONF_parse_list
776                (str, ',', 1, bitstr_cb, atmp->value.bit_string)) {
777                ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_LIST_ERROR);
778                goto bad_str;
779            }
780            no_unused = 0;
781
782        } else {
783            ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_ILLEGAL_BITSTRING_FORMAT);
784            goto bad_form;
785        }
786
787        if ((utype == V_ASN1_BIT_STRING) && no_unused) {
788            atmp->value.asn1_string->flags
789                &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
790            atmp->value.asn1_string->flags |= ASN1_STRING_FLAG_BITS_LEFT;
791        }
792
793        break;
794
795    default:
796        ASN1err(ASN1_F_ASN1_STR2TYPE, ASN1_R_UNSUPPORTED_TYPE);
797        goto bad_str;
798        break;
799    }
800
801    atmp->type = utype;
802    return atmp;
803
804 bad_str:
805    ERR_add_error_data(2, "string=", str);
806 bad_form:
807
808    ASN1_TYPE_free(atmp);
809    return NULL;
810
811}
812
813static int bitstr_cb(const char *elem, int len, void *bitstr)
814{
815    long bitnum;
816    char *eptr;
817    if (!elem)
818        return 0;
819    bitnum = strtoul(elem, &eptr, 10);
820    if (eptr && *eptr && (eptr != elem + len))
821        return 0;
822    if (bitnum < 0) {
823        ASN1err(ASN1_F_BITSTR_CB, ASN1_R_INVALID_NUMBER);
824        return 0;
825    }
826    if (!ASN1_BIT_STRING_set_bit(bitstr, bitnum, 1)) {
827        ASN1err(ASN1_F_BITSTR_CB, ERR_R_MALLOC_FAILURE);
828        return 0;
829    }
830    return 1;
831}
832