mirror of
https://github.com/ossrs/srs.git
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343 lines
9.5 KiB
C
343 lines
9.5 KiB
C
/*
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* Copyright 1999-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "crypto/ctype.h"
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#include "internal/cryptlib.h"
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#include <openssl/asn1.h>
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static int traverse_string(const unsigned char *p, int len, int inform,
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int (*rfunc) (unsigned long value, void *in),
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void *arg);
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static int in_utf8(unsigned long value, void *arg);
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static int out_utf8(unsigned long value, void *arg);
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static int type_str(unsigned long value, void *arg);
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static int cpy_asc(unsigned long value, void *arg);
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static int cpy_bmp(unsigned long value, void *arg);
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static int cpy_univ(unsigned long value, void *arg);
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static int cpy_utf8(unsigned long value, void *arg);
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/*
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* These functions take a string in UTF8, ASCII or multibyte form and a mask
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* of permissible ASN1 string types. It then works out the minimal type
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* (using the order Numeric < Printable < IA5 < T61 < BMP < Universal < UTF8)
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* and creates a string of the correct type with the supplied data. Yes this is
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* horrible: it has to be :-( The 'ncopy' form checks minimum and maximum
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* size limits too.
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*/
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int ASN1_mbstring_copy(ASN1_STRING **out, const unsigned char *in, int len,
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int inform, unsigned long mask)
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{
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return ASN1_mbstring_ncopy(out, in, len, inform, mask, 0, 0);
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}
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int ASN1_mbstring_ncopy(ASN1_STRING **out, const unsigned char *in, int len,
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int inform, unsigned long mask,
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long minsize, long maxsize)
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{
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int str_type;
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int ret;
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char free_out;
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int outform, outlen = 0;
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ASN1_STRING *dest;
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unsigned char *p;
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int nchar;
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char strbuf[32];
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int (*cpyfunc) (unsigned long, void *) = NULL;
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if (len == -1)
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len = strlen((const char *)in);
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if (!mask)
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mask = DIRSTRING_TYPE;
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/* First do a string check and work out the number of characters */
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switch (inform) {
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case MBSTRING_BMP:
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if (len & 1) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY,
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ASN1_R_INVALID_BMPSTRING_LENGTH);
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return -1;
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}
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nchar = len >> 1;
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break;
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case MBSTRING_UNIV:
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if (len & 3) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY,
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ASN1_R_INVALID_UNIVERSALSTRING_LENGTH);
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return -1;
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}
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nchar = len >> 2;
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break;
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case MBSTRING_UTF8:
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nchar = 0;
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/* This counts the characters and does utf8 syntax checking */
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ret = traverse_string(in, len, MBSTRING_UTF8, in_utf8, &nchar);
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if (ret < 0) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_INVALID_UTF8STRING);
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return -1;
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}
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break;
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case MBSTRING_ASC:
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nchar = len;
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break;
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default:
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_UNKNOWN_FORMAT);
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return -1;
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}
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if ((minsize > 0) && (nchar < minsize)) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_STRING_TOO_SHORT);
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BIO_snprintf(strbuf, sizeof(strbuf), "%ld", minsize);
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ERR_add_error_data(2, "minsize=", strbuf);
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return -1;
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}
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if ((maxsize > 0) && (nchar > maxsize)) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_STRING_TOO_LONG);
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BIO_snprintf(strbuf, sizeof(strbuf), "%ld", maxsize);
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ERR_add_error_data(2, "maxsize=", strbuf);
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return -1;
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}
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/* Now work out minimal type (if any) */
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if (traverse_string(in, len, inform, type_str, &mask) < 0) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ASN1_R_ILLEGAL_CHARACTERS);
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return -1;
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}
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/* Now work out output format and string type */
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outform = MBSTRING_ASC;
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if (mask & B_ASN1_NUMERICSTRING)
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str_type = V_ASN1_NUMERICSTRING;
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else if (mask & B_ASN1_PRINTABLESTRING)
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str_type = V_ASN1_PRINTABLESTRING;
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else if (mask & B_ASN1_IA5STRING)
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str_type = V_ASN1_IA5STRING;
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else if (mask & B_ASN1_T61STRING)
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str_type = V_ASN1_T61STRING;
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else if (mask & B_ASN1_BMPSTRING) {
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str_type = V_ASN1_BMPSTRING;
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outform = MBSTRING_BMP;
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} else if (mask & B_ASN1_UNIVERSALSTRING) {
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str_type = V_ASN1_UNIVERSALSTRING;
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outform = MBSTRING_UNIV;
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} else {
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str_type = V_ASN1_UTF8STRING;
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outform = MBSTRING_UTF8;
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}
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if (!out)
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return str_type;
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if (*out) {
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free_out = 0;
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dest = *out;
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OPENSSL_free(dest->data);
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dest->data = NULL;
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dest->length = 0;
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dest->type = str_type;
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} else {
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free_out = 1;
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dest = ASN1_STRING_type_new(str_type);
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if (dest == NULL) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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*out = dest;
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}
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/* If both the same type just copy across */
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if (inform == outform) {
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if (!ASN1_STRING_set(dest, in, len)) {
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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return str_type;
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}
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/* Work out how much space the destination will need */
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switch (outform) {
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case MBSTRING_ASC:
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outlen = nchar;
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cpyfunc = cpy_asc;
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break;
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case MBSTRING_BMP:
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outlen = nchar << 1;
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cpyfunc = cpy_bmp;
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break;
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case MBSTRING_UNIV:
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outlen = nchar << 2;
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cpyfunc = cpy_univ;
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break;
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case MBSTRING_UTF8:
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outlen = 0;
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traverse_string(in, len, inform, out_utf8, &outlen);
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cpyfunc = cpy_utf8;
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break;
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}
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if ((p = OPENSSL_malloc(outlen + 1)) == NULL) {
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if (free_out)
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ASN1_STRING_free(dest);
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ASN1err(ASN1_F_ASN1_MBSTRING_NCOPY, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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dest->length = outlen;
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dest->data = p;
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p[outlen] = 0;
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traverse_string(in, len, inform, cpyfunc, &p);
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return str_type;
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}
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/*
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* This function traverses a string and passes the value of each character to
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* an optional function along with a void * argument.
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*/
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static int traverse_string(const unsigned char *p, int len, int inform,
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int (*rfunc) (unsigned long value, void *in),
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void *arg)
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{
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unsigned long value;
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int ret;
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while (len) {
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if (inform == MBSTRING_ASC) {
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value = *p++;
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len--;
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} else if (inform == MBSTRING_BMP) {
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value = *p++ << 8;
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value |= *p++;
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len -= 2;
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} else if (inform == MBSTRING_UNIV) {
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value = ((unsigned long)*p++) << 24;
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value |= ((unsigned long)*p++) << 16;
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value |= *p++ << 8;
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value |= *p++;
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len -= 4;
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} else {
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ret = UTF8_getc(p, len, &value);
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if (ret < 0)
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return -1;
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len -= ret;
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p += ret;
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}
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if (rfunc) {
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ret = rfunc(value, arg);
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if (ret <= 0)
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return ret;
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}
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}
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return 1;
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}
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/* Various utility functions for traverse_string */
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/* Just count number of characters */
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static int in_utf8(unsigned long value, void *arg)
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{
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int *nchar;
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nchar = arg;
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(*nchar)++;
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return 1;
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}
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/* Determine size of output as a UTF8 String */
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static int out_utf8(unsigned long value, void *arg)
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{
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int *outlen;
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outlen = arg;
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*outlen += UTF8_putc(NULL, -1, value);
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return 1;
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}
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/*
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* Determine the "type" of a string: check each character against a supplied
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* "mask".
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*/
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static int type_str(unsigned long value, void *arg)
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{
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unsigned long types = *((unsigned long *)arg);
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const int native = value > INT_MAX ? INT_MAX : ossl_fromascii(value);
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if ((types & B_ASN1_NUMERICSTRING) && !(ossl_isdigit(native)
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|| native == ' '))
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types &= ~B_ASN1_NUMERICSTRING;
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if ((types & B_ASN1_PRINTABLESTRING) && !ossl_isasn1print(native))
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types &= ~B_ASN1_PRINTABLESTRING;
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if ((types & B_ASN1_IA5STRING) && !ossl_isascii(native))
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types &= ~B_ASN1_IA5STRING;
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if ((types & B_ASN1_T61STRING) && (value > 0xff))
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types &= ~B_ASN1_T61STRING;
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if ((types & B_ASN1_BMPSTRING) && (value > 0xffff))
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types &= ~B_ASN1_BMPSTRING;
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if (!types)
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return -1;
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*((unsigned long *)arg) = types;
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return 1;
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}
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/* Copy one byte per character ASCII like strings */
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static int cpy_asc(unsigned long value, void *arg)
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{
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unsigned char **p, *q;
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p = arg;
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q = *p;
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*q = (unsigned char)value;
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(*p)++;
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return 1;
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}
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/* Copy two byte per character BMPStrings */
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static int cpy_bmp(unsigned long value, void *arg)
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{
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unsigned char **p, *q;
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p = arg;
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q = *p;
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*q++ = (unsigned char)((value >> 8) & 0xff);
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*q = (unsigned char)(value & 0xff);
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*p += 2;
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return 1;
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}
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/* Copy four byte per character UniversalStrings */
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static int cpy_univ(unsigned long value, void *arg)
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{
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unsigned char **p, *q;
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p = arg;
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q = *p;
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*q++ = (unsigned char)((value >> 24) & 0xff);
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*q++ = (unsigned char)((value >> 16) & 0xff);
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*q++ = (unsigned char)((value >> 8) & 0xff);
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*q = (unsigned char)(value & 0xff);
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*p += 4;
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return 1;
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}
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/* Copy to a UTF8String */
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static int cpy_utf8(unsigned long value, void *arg)
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{
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unsigned char **p;
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int ret;
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p = arg;
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/* We already know there is enough room so pass 0xff as the length */
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ret = UTF8_putc(*p, 0xff, value);
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*p += ret;
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return 1;
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}
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