v3_utl.c

开源的ssl算法openssl,版本0.9.8H

		else if ((cl >= 'a') && (cl <= 'f')) cl -= 'a' - 10;
		else goto badhex;

		*q++ = (ch << 4) | cl;
	}

	if(len) *len = q - hexbuf;

	return hexbuf;

	err:
	if(hexbuf) OPENSSL_free(hexbuf);
	X509V3err(X509V3_F_STRING_TO_HEX,ERR_R_MALLOC_FAILURE);
	return NULL;

	badhex:
	OPENSSL_free(hexbuf);
	X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ILLEGAL_HEX_DIGIT);
	return NULL;

}

/* V2I name comparison function: returns zero if 'name' matches
 * cmp or cmp.*
 */

int name_cmp(const char *name, const char *cmp)
{
	int len, ret;
	char c;
	len = strlen(cmp);
	if((ret = strncmp(name, cmp, len))) return ret;
	c = name[len];
	if(!c || (c=='.')) return 0;
	return 1;
}

static int sk_strcmp(const char * const *a, const char * const *b)
{
	return strcmp(*a, *b);
}

STACK *X509_get1_email(X509 *x)
{
	GENERAL_NAMES *gens;
	STACK *ret;
	gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
	ret = get_email(X509_get_subject_name(x), gens);
	sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
	return ret;
}

STACK *X509_REQ_get1_email(X509_REQ *x)
{
	GENERAL_NAMES *gens;
	STACK_OF(X509_EXTENSION) *exts;
	STACK *ret;
	exts = X509_REQ_get_extensions(x);
	gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
	ret = get_email(X509_REQ_get_subject_name(x), gens);
	sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
	sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
	return ret;
}


static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens)
{
	STACK *ret = NULL;
	X509_NAME_ENTRY *ne;
	ASN1_IA5STRING *email;
	GENERAL_NAME *gen;
	int i;
	/* Now add any email address(es) to STACK */
	i = -1;
	/* First supplied X509_NAME */
	while((i = X509_NAME_get_index_by_NID(name,
					 NID_pkcs9_emailAddress, i)) >= 0) {
		ne = X509_NAME_get_entry(name, i);
		email = X509_NAME_ENTRY_get_data(ne);
		if(!append_ia5(&ret, email)) return NULL;
	}
	for(i = 0; i < sk_GENERAL_NAME_num(gens); i++)
	{
		gen = sk_GENERAL_NAME_value(gens, i);
		if(gen->type != GEN_EMAIL) continue;
		if(!append_ia5(&ret, gen->d.ia5)) return NULL;
	}
	return ret;
}

static void str_free(void *str)
{
	OPENSSL_free(str);
}

static int append_ia5(STACK **sk, ASN1_IA5STRING *email)
{
	char *emtmp;
	/* First some sanity checks */
	if(email->type != V_ASN1_IA5STRING) return 1;
	if(!email->data || !email->length) return 1;
	if(!*sk) *sk = sk_new(sk_strcmp);
	if(!*sk) return 0;
	/* Don't add duplicates */
	if(sk_find(*sk, (char *)email->data) != -1) return 1;
	emtmp = BUF_strdup((char *)email->data);
	if(!emtmp || !sk_push(*sk, emtmp)) {
		X509_email_free(*sk);
		*sk = NULL;
		return 0;
	}
	return 1;
}

void X509_email_free(STACK *sk)
{
	sk_pop_free(sk, str_free);
}

/* Convert IP addresses both IPv4 and IPv6 into an 
 * OCTET STRING compatible with RFC3280.
 */

ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
	{
	unsigned char ipout[16];
	ASN1_OCTET_STRING *ret;
	int iplen;

	/* If string contains a ':' assume IPv6 */

	iplen = a2i_ipadd(ipout, ipasc);

	if (!iplen)
		return NULL;

	ret = ASN1_OCTET_STRING_new();
	if (!ret)
		return NULL;
	if (!ASN1_OCTET_STRING_set(ret, ipout, iplen))
		{
		ASN1_OCTET_STRING_free(ret);
		return NULL;
		}
	return ret;
	}

ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
	{
	ASN1_OCTET_STRING *ret = NULL;
	unsigned char ipout[32];
	char *iptmp = NULL, *p;
	int iplen1, iplen2;
	p = strchr(ipasc,'/');
	if (!p)
		return NULL;
	iptmp = BUF_strdup(ipasc);
	if (!iptmp)
		return NULL;
	p = iptmp + (p - ipasc);
	*p++ = 0;

	iplen1 = a2i_ipadd(ipout, iptmp);

	if (!iplen1)
		goto err;

	iplen2 = a2i_ipadd(ipout + iplen1, p);

	OPENSSL_free(iptmp);
	iptmp = NULL;

	if (!iplen2 || (iplen1 != iplen2))
		goto err;

	ret = ASN1_OCTET_STRING_new();
	if (!ret)
		goto err;
	if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
		goto err;

	return ret;

	err:
	if (iptmp)
		OPENSSL_free(iptmp);
	if (ret)
		ASN1_OCTET_STRING_free(ret);
	return NULL;
	}
	

int a2i_ipadd(unsigned char *ipout, const char *ipasc)
	{
	/* If string contains a ':' assume IPv6 */

	if (strchr(ipasc, ':'))
		{
		if (!ipv6_from_asc(ipout, ipasc))
			return 0;
		return 16;
		}
	else
		{
		if (!ipv4_from_asc(ipout, ipasc))
			return 0;
		return 4;
		}
	}

static int ipv4_from_asc(unsigned char *v4, const char *in)
	{
	int a0, a1, a2, a3;
	if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
		return 0;
	if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
		|| (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
		return 0;
	v4[0] = a0;
	v4[1] = a1;
	v4[2] = a2;
	v4[3] = a3;
	return 1;
	}

typedef struct {
		/* Temporary store for IPV6 output */
		unsigned char tmp[16];
		/* Total number of bytes in tmp */
		int total;
		/* The position of a zero (corresponding to '::') */
		int zero_pos;
		/* Number of zeroes */
		int zero_cnt;
	} IPV6_STAT;


static int ipv6_from_asc(unsigned char *v6, const char *in)
	{
	IPV6_STAT v6stat;
	v6stat.total = 0;
	v6stat.zero_pos = -1;
	v6stat.zero_cnt = 0;
	/* Treat the IPv6 representation as a list of values
	 * separated by ':'. The presence of a '::' will parse
 	 * as one, two or three zero length elements.
	 */
	if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
		return 0;

	/* Now for some sanity checks */

	if (v6stat.zero_pos == -1)
		{
		/* If no '::' must have exactly 16 bytes */
		if (v6stat.total != 16)
			return 0;
		}
	else 
		{
		/* If '::' must have less than 16 bytes */
		if (v6stat.total == 16)
			return 0;
		/* More than three zeroes is an error */
		if (v6stat.zero_cnt > 3)
			return 0;
		/* Can only have three zeroes if nothing else present */
		else if (v6stat.zero_cnt == 3)
			{
			if (v6stat.total > 0)
				return 0;
			}
		/* Can only have two zeroes if at start or end */
		else if (v6stat.zero_cnt == 2)
			{
			if ((v6stat.zero_pos != 0)
				&& (v6stat.zero_pos != v6stat.total))
				return 0;
			}
		else 
		/* Can only have one zero if *not* start or end */
			{
			if ((v6stat.zero_pos == 0)
				|| (v6stat.zero_pos == v6stat.total))
				return 0;
			}
		}

	/* Format result */

	/* Copy initial part */
	if (v6stat.zero_pos > 0)
		memcpy(v6, v6stat.tmp, v6stat.zero_pos);
	/* Zero middle */
	if (v6stat.total != 16)
		memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
	/* Copy final part */
	if (v6stat.total != v6stat.zero_pos)
		memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
			v6stat.tmp + v6stat.zero_pos,
			v6stat.total - v6stat.zero_pos);

	return 1;
	}

static int ipv6_cb(const char *elem, int len, void *usr)
	{
	IPV6_STAT *s = usr;
	/* Error if 16 bytes written */
	if (s->total == 16)
		return 0;
	if (len == 0)
		{
		/* Zero length element, corresponds to '::' */
		if (s->zero_pos == -1)
			s->zero_pos = s->total;
		/* If we've already got a :: its an error */
		else if (s->zero_pos != s->total)
			return 0;
		s->zero_cnt++;
		}
	else 
		{
		/* If more than 4 characters could be final a.b.c.d form */
		if (len > 4)
			{
			/* Need at least 4 bytes left */
			if (s->total > 12)
				return 0;
			/* Must be end of string */
			if (elem[len])
				return 0;
			if (!ipv4_from_asc(s->tmp + s->total, elem))
				return 0;
			s->total += 4;
			}
		else
			{
			if (!ipv6_hex(s->tmp + s->total, elem, len))
				return 0;
			s->total += 2;
			}
		}
	return 1;
	}

/* Convert a string of up to 4 hex digits into the corresponding
 * IPv6 form.
 */

static int ipv6_hex(unsigned char *out, const char *in, int inlen)
	{
	unsigned char c;
	unsigned int num = 0;
	if (inlen > 4)
		return 0;
	while(inlen--)
		{
		c = *in++;
		num <<= 4;
		if ((c >= '0') && (c <= '9'))
			num |= c - '0';
		else if ((c >= 'A') && (c <= 'F'))
			num |= c - 'A' + 10;
		else if ((c >= 'a') && (c <= 'f'))
			num |=  c - 'a' + 10;
		else
			return 0;
		}
	out[0] = num >> 8;
	out[1] = num & 0xff;
	return 1;
	}


int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE)*dn_sk,
						unsigned long chtype)
	{
	CONF_VALUE *v;
	int i, mval;
	char *p, *type;
	if (!nm)
		return 0;

	for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++)
		{
		v=sk_CONF_VALUE_value(dn_sk,i);
		type=v->name;
		/* Skip past any leading X. X: X, etc to allow for
		 * multiple instances 
		 */
		for(p = type; *p ; p++) 
#ifndef CHARSET_EBCDIC
			if ((*p == ':') || (*p == ',') || (*p == '.'))
#else
			if ((*p == os_toascii[':']) || (*p == os_toascii[',']) || (*p == os_toascii['.']))
#endif
				{
				p++;
				if(*p) type = p;
				break;
				}
#ifndef CHARSET_EBCDIC
		if (*type == '+')
#else
		if (*type == os_toascii['+'])
#endif
			{
			mval = -1;
			type++;
			}
		else
			mval = 0;
		if (!X509_NAME_add_entry_by_txt(nm,type, chtype,
				(unsigned char *) v->value,-1,-1,mval))
					return 0;

		}
	return 1;
	}