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151da51404
curl/lib/x509asn1.c
Jay Satiro 6c2c019654 x509asn1: Fix host altname verification 
- In Curl_verifyhost check all altnames in the certificate.

Prior to this change only the first altname was checked. Only the GSKit
SSL backend was affected by this bug.

Bug: http://curl.haxx.se/mail/lib-2015-12/0062.html
Reported-by: John Kohl
2015-12-15 14:07:28 -05:00

1185 lines
34 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#if defined(USE_GSKIT) || defined(USE_NSS) || defined(USE_GNUTLS) || \
defined(USE_CYASSL)
#include <curl/curl.h>
#include "urldata.h"
#include "strequal.h"
#include "hostcheck.h"
#include "vtls/vtls.h"
#include "sendf.h"
#include "inet_pton.h"
#include "curl_base64.h"
#include "x509asn1.h"
#include "curl_printf.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/* ASN.1 OIDs. */
static const char cnOID[] = "2.5.4.3"; /* Common name. */
static const char sanOID[] = "2.5.29.17"; /* Subject alternative name. */
static const curl_OID OIDtable[] = {
{ "1.2.840.10040.4.1", "dsa" },
{ "1.2.840.10040.4.3", "dsa-with-sha1" },
{ "1.2.840.10045.2.1", "ecPublicKey" },
{ "1.2.840.10045.3.0.1", "c2pnb163v1" },
{ "1.2.840.10045.4.1", "ecdsa-with-SHA1" },
{ "1.2.840.10046.2.1", "dhpublicnumber" },
{ "1.2.840.113549.1.1.1", "rsaEncryption" },
{ "1.2.840.113549.1.1.2", "md2WithRSAEncryption" },
{ "1.2.840.113549.1.1.4", "md5WithRSAEncryption" },
{ "1.2.840.113549.1.1.5", "sha1WithRSAEncryption" },
{ "1.2.840.113549.1.1.10", "RSASSA-PSS" },
{ "1.2.840.113549.1.1.14", "sha224WithRSAEncryption" },
{ "1.2.840.113549.1.1.11", "sha256WithRSAEncryption" },
{ "1.2.840.113549.1.1.12", "sha384WithRSAEncryption" },
{ "1.2.840.113549.1.1.13", "sha512WithRSAEncryption" },
{ "1.2.840.113549.2.2", "md2" },
{ "1.2.840.113549.2.5", "md5" },
{ "1.3.14.3.2.26", "sha1" },
{ cnOID, "CN" },
{ "2.5.4.4", "SN" },
{ "2.5.4.5", "serialNumber" },
{ "2.5.4.6", "C" },
{ "2.5.4.7", "L" },
{ "2.5.4.8", "ST" },
{ "2.5.4.9", "streetAddress" },
{ "2.5.4.10", "O" },
{ "2.5.4.11", "OU" },
{ "2.5.4.12", "title" },
{ "2.5.4.13", "description" },
{ "2.5.4.17", "postalCode" },
{ "2.5.4.41", "name" },
{ "2.5.4.42", "givenName" },
{ "2.5.4.43", "initials" },
{ "2.5.4.44", "generationQualifier" },
{ "2.5.4.45", "X500UniqueIdentifier" },
{ "2.5.4.46", "dnQualifier" },
{ "2.5.4.65", "pseudonym" },
{ "1.2.840.113549.1.9.1", "emailAddress" },
{ "2.5.4.72", "role" },
{ sanOID, "subjectAltName" },
{ "2.5.29.18", "issuerAltName" },
{ "2.5.29.19", "basicConstraints" },
{ "2.16.840.1.101.3.4.2.4", "sha224" },
{ "2.16.840.1.101.3.4.2.1", "sha256" },
{ "2.16.840.1.101.3.4.2.2", "sha384" },
{ "2.16.840.1.101.3.4.2.3", "sha512" },
{ (const char *) NULL, (const char *) NULL }
};
/*
* Lightweight ASN.1 parser.
* In particular, it does not check for syntactic/lexical errors.
* It is intended to support certificate information gathering for SSL backends
* that offer a mean to get certificates as a whole, but do not supply
* entry points to get particular certificate sub-fields.
* Please note there is no pretention here to rewrite a full SSL library.
*/
const char * Curl_getASN1Element(curl_asn1Element * elem,
const char * beg, const char * end)
{
unsigned char b;
unsigned long len;
curl_asn1Element lelem;
/* Get a single ASN.1 element into `elem', parse ASN.1 string at `beg'
ending at `end'.
Returns a pointer in source string after the parsed element, or NULL
if an error occurs. */
if(beg >= end || !*beg)
return (const char *) NULL;
/* Process header byte. */
elem->header = beg;
b = (unsigned char) *beg++;
elem->constructed = (b & 0x20) != 0;
elem->class = (b >> 6) & 3;
b &= 0x1F;
if(b == 0x1F)
return (const char *) NULL; /* Long tag values not supported here. */
elem->tag = b;
/* Process length. */
if(beg >= end)
return (const char *) NULL;
b = (unsigned char) *beg++;
if(!(b & 0x80))
len = b;
else if(!(b &= 0x7F)) {
/* Unspecified length. Since we have all the data, we can determine the
effective length by skipping element until an end element is found. */
if(!elem->constructed)
return (const char *) NULL;
elem->beg = beg;
while(beg < end && *beg) {
beg = Curl_getASN1Element(&lelem, beg, end);
if(!beg)
return (const char *) NULL;
}
if(beg >= end)
return (const char *) NULL;
elem->end = beg;
return beg + 1;
}
else if(beg + b > end)
return (const char *) NULL; /* Does not fit in source. */
else {
/* Get long length. */
len = 0;
do {
if(len & 0xFF000000L)
return (const char *) NULL; /* Lengths > 32 bits are not supported. */
len = (len << 8) | (unsigned char) *beg++;
} while(--b);
}
if((unsigned long) (end - beg) < len)
return (const char *) NULL; /* Element data does not fit in source. */
elem->beg = beg;
elem->end = beg + len;
return elem->end;
}
static const curl_OID * searchOID(const char * oid)
{
const curl_OID * op;
/* Search the null terminated OID or OID identifier in local table.
Return the table entry pointer or NULL if not found. */
for(op = OIDtable; op->numoid; op++)
if(!strcmp(op->numoid, oid) || curl_strequal(op->textoid, oid))
return op;
return (const curl_OID *) NULL;
}
static const char * bool2str(const char * beg, const char * end)
{
/* Convert an ASN.1 Boolean value into its string representation.
Return the dynamically allocated string, or NULL if source is not an
ASN.1 Boolean value. */
if(end - beg != 1)
return (const char *) NULL;
return strdup(*beg? "TRUE": "FALSE");
}
static const char * octet2str(const char * beg, const char * end)
{
size_t n = end - beg;
char * buf;
/* Convert an ASN.1 octet string to a printable string.
Return the dynamically allocated string, or NULL if an error occurs. */
buf = malloc(3 * n + 1);
if(buf)
for(n = 0; beg < end; n += 3)
snprintf(buf + n, 4, "%02x:", *(const unsigned char *) beg++);
return buf;
}
static const char * bit2str(const char * beg, const char * end)
{
/* Convert an ASN.1 bit string to a printable string.
Return the dynamically allocated string, or NULL if an error occurs. */
if(++beg > end)
return (const char *) NULL;
return octet2str(beg, end);
}
static const char * int2str(const char * beg, const char * end)
{
long val = 0;
size_t n = end - beg;
/* Convert an ASN.1 integer value into its string representation.
Return the dynamically allocated string, or NULL if source is not an
ASN.1 integer value. */
if(!n)
return (const char *) NULL;
if(n > 4)
return octet2str(beg, end);
/* Represent integers <= 32-bit as a single value. */
if(*beg & 0x80)
val = ~val;
do
val = (val << 8) | *(const unsigned char *) beg++;
while(beg < end);
return curl_maprintf("%s%lx", (val < 0 || val >= 10)? "0x": "", val);
}
static ssize_t
utf8asn1str(char * * to, int type, const char * from, const char * end)
{
size_t inlength = end - from;
int size = 1;
size_t outlength;
int charsize;
unsigned int wc;
char * buf;
/* Perform a lazy conversion from an ASN.1 typed string to UTF8. Allocate the
destination buffer dynamically. The allocation size will normally be too
large: this is to avoid buffer overflows.
Terminate the string with a nul byte and return the converted
string length. */
*to = (char *) NULL;
switch (type) {
case CURL_ASN1_BMP_STRING:
size = 2;
break;
case CURL_ASN1_UNIVERSAL_STRING:
size = 4;
break;
case CURL_ASN1_NUMERIC_STRING:
case CURL_ASN1_PRINTABLE_STRING:
case CURL_ASN1_TELETEX_STRING:
case CURL_ASN1_IA5_STRING:
case CURL_ASN1_VISIBLE_STRING:
case CURL_ASN1_UTF8_STRING:
break;
default:
return -1; /* Conversion not supported. */
}
if(inlength % size)
return -1; /* Length inconsistent with character size. */
buf = malloc(4 * (inlength / size) + 1);
if(!buf)
return -1; /* Not enough memory. */
if(type == CURL_ASN1_UTF8_STRING) {
/* Just copy. */
outlength = inlength;
if(outlength)
memcpy(buf, from, outlength);
}
else {
for(outlength = 0; from < end;) {
wc = 0;
switch (size) {
case 4:
wc = (wc << 8) | *(const unsigned char *) from++;
wc = (wc << 8) | *(const unsigned char *) from++;
/* fallthrough */
case 2:
wc = (wc << 8) | *(const unsigned char *) from++;
/* fallthrough */
default: /* case 1: */
wc = (wc << 8) | *(const unsigned char *) from++;
}
charsize = 1;
if(wc >= 0x00000080) {
if(wc >= 0x00000800) {
if(wc >= 0x00010000) {
if(wc >= 0x00200000) {
free(buf);
return -1; /* Invalid char. size for target encoding. */
}
buf[outlength + 3] = (char) (0x80 | (wc & 0x3F));
wc = (wc >> 6) | 0x00010000;
charsize++;
}
buf[outlength + 2] = (char) (0x80 | (wc & 0x3F));
wc = (wc >> 6) | 0x00000800;
charsize++;
}
buf[outlength + 1] = (char) (0x80 | (wc & 0x3F));
wc = (wc >> 6) | 0x000000C0;
charsize++;
}
buf[outlength] = (char) wc;
outlength += charsize;
}
}
buf[outlength] = '\0';
*to = buf;
return outlength;
}
static const char * string2str(int type, const char * beg, const char * end)
{
char * buf;
/* Convert an ASN.1 String into its UTF-8 string representation.
Return the dynamically allocated string, or NULL if an error occurs. */
if(utf8asn1str(&buf, type, beg, end) < 0)
return (const char *) NULL;
return buf;
}
static int encodeUint(char * buf, int n, unsigned int x)
{
int i = 0;
unsigned int y = x / 10;
/* Decimal ASCII encode unsigned integer `x' in the `n'-byte buffer at `buf'.
Return the total number of encoded digits, even if larger than `n'. */
if(y) {
i += encodeUint(buf, n, y);
x -= y * 10;
}
if(i < n)
buf[i] = (char) ('0' + x);
i++;
if(i < n)
buf[i] = '\0'; /* Store a terminator if possible. */
return i;
}
static int encodeOID(char * buf, int n, const char * beg, const char * end)
{
int i = 0;
unsigned int x;
unsigned int y;
/* Convert an ASN.1 OID into its dotted string representation.
Store the result in th `n'-byte buffer at `buf'.
Return the converted string length, or -1 if an error occurs. */
/* Process the first two numbers. */
y = *(const unsigned char *) beg++;
x = y / 40;
y -= x * 40;
i += encodeUint(buf + i, n - i, x);
if(i < n)
buf[i] = '.';
i++;
i += encodeUint(buf + i, n - i, y);
/* Process the trailing numbers. */
while(beg < end) {
if(i < n)
buf[i] = '.';
i++;
x = 0;
do {
if(x & 0xFF000000)
return -1;
y = *(const unsigned char *) beg++;
x = (x << 7) | (y & 0x7F);
} while(y & 0x80);
i += encodeUint(buf + i, n - i, x);
}
if(i < n)
buf[i] = '\0';
return i;
}
static const char * OID2str(const char * beg, const char * end, bool symbolic)
{
char * buf = (char *) NULL;
const curl_OID * op;
int n;
/* Convert an ASN.1 OID into its dotted or symbolic string representation.
Return the dynamically allocated string, or NULL if an error occurs. */
if(beg < end) {
n = encodeOID((char *) NULL, -1, beg, end);
if(n >= 0) {
buf = malloc(n + 1);
if(buf) {
encodeOID(buf, n, beg, end);
buf[n] = '\0';
if(symbolic) {
op = searchOID(buf);
if(op) {
free(buf);
buf = strdup(op->textoid);
}
}
}
}
}
return buf;
}
static const char * GTime2str(const char * beg, const char * end)
{
const char * tzp;
const char * fracp;
char sec1, sec2;
size_t fracl;
size_t tzl;
const char * sep = "";
/* Convert an ASN.1 Generalized time to a printable string.
Return the dynamically allocated string, or NULL if an error occurs. */
for(fracp = beg; fracp < end && *fracp >= '0' && *fracp <= '9'; fracp++)
;
/* Get seconds digits. */
sec1 = '0';
switch (fracp - beg - 12) {
case 0:
sec2 = '0';
break;
case 2:
sec1 = fracp[-2];
case 1:
sec2 = fracp[-1];
break;
default:
return (const char *) NULL;
}
/* Scan for timezone, measure fractional seconds. */
tzp = fracp;
fracl = 0;
if(fracp < end && (*fracp == '.' || *fracp == ',')) {
fracp++;
do
tzp++;
while(tzp < end && *tzp >= '0' && *tzp <= '9');
/* Strip leading zeroes in fractional seconds. */
for(fracl = tzp - fracp - 1; fracl && fracp[fracl - 1] == '0'; fracl--)
;
}
/* Process timezone. */
if(tzp >= end)
; /* Nothing to do. */
else if(*tzp == 'Z') {
tzp = " GMT";
end = tzp + 4;
}
else {
sep = " ";
tzp++;
}
tzl = end - tzp;
return curl_maprintf("%.4s-%.2s-%.2s %.2s:%.2s:%c%c%s%.*s%s%.*s",
beg, beg + 4, beg + 6,
beg + 8, beg + 10, sec1, sec2,
fracl? ".": "", fracl, fracp,
sep, tzl, tzp);
}
static const char * UTime2str(const char * beg, const char * end)
{
const char * tzp;
size_t tzl;
const char * sec;
/* Convert an ASN.1 UTC time to a printable string.
Return the dynamically allocated string, or NULL if an error occurs. */
for(tzp = beg; tzp < end && *tzp >= '0' && *tzp <= '9'; tzp++)
;
/* Get the seconds. */
sec = beg + 10;
switch (tzp - sec) {
case 0:
sec = "00";
case 2:
break;
default:
return (const char *) NULL;
}
/* Process timezone. */
if(tzp >= end)
return (const char *) NULL;
if(*tzp == 'Z') {
tzp = "GMT";
end = tzp + 3;
}
else
tzp++;
tzl = end - tzp;
return curl_maprintf("%u%.2s-%.2s-%.2s %.2s:%.2s:%.2s %.*s",
20 - (*beg >= '5'), beg, beg + 2, beg + 4,
beg + 6, beg + 8, sec,
tzl, tzp);
}
const char * Curl_ASN1tostr(curl_asn1Element * elem, int type)
{
/* Convert an ASN.1 element to a printable string.
Return the dynamically allocated string, or NULL if an error occurs. */
if(elem->constructed)
return (const char *) NULL; /* No conversion of structured elements. */
if(!type)
type = elem->tag; /* Type not forced: use element tag as type. */
switch (type) {
case CURL_ASN1_BOOLEAN:
return bool2str(elem->beg, elem->end);
case CURL_ASN1_INTEGER:
case CURL_ASN1_ENUMERATED:
return int2str(elem->beg, elem->end);
case CURL_ASN1_BIT_STRING:
return bit2str(elem->beg, elem->end);
case CURL_ASN1_OCTET_STRING:
return octet2str(elem->beg, elem->end);
case CURL_ASN1_NULL:
return strdup("");
case CURL_ASN1_OBJECT_IDENTIFIER:
return OID2str(elem->beg, elem->end, TRUE);
case CURL_ASN1_UTC_TIME:
return UTime2str(elem->beg, elem->end);
case CURL_ASN1_GENERALIZED_TIME:
return GTime2str(elem->beg, elem->end);
case CURL_ASN1_UTF8_STRING:
case CURL_ASN1_NUMERIC_STRING:
case CURL_ASN1_PRINTABLE_STRING:
case CURL_ASN1_TELETEX_STRING:
case CURL_ASN1_IA5_STRING:
case CURL_ASN1_VISIBLE_STRING:
case CURL_ASN1_UNIVERSAL_STRING:
case CURL_ASN1_BMP_STRING:
return string2str(type, elem->beg, elem->end);
}
return (const char *) NULL; /* Unsupported. */
}
static ssize_t encodeDN(char * buf, size_t n, curl_asn1Element * dn)
{
curl_asn1Element rdn;
curl_asn1Element atv;
curl_asn1Element oid;
curl_asn1Element value;
size_t l = 0;
const char * p1;
const char * p2;
const char * p3;
const char * str;
/* ASCII encode distinguished name at `dn' into the `n'-byte buffer at `buf'.
Return the total string length, even if larger than `n'. */
for(p1 = dn->beg; p1 < dn->end;) {
p1 = Curl_getASN1Element(&rdn, p1, dn->end);
for(p2 = rdn.beg; p2 < rdn.end;) {
p2 = Curl_getASN1Element(&atv, p2, rdn.end);
p3 = Curl_getASN1Element(&oid, atv.beg, atv.end);
Curl_getASN1Element(&value, p3, atv.end);
str = Curl_ASN1tostr(&oid, 0);
if(!str)
return -1;
/* Encode delimiter.
If attribute has a short uppercase name, delimiter is ", ". */
if(l) {
for(p3 = str; isupper(*p3); p3++)
;
for(p3 = (*p3 || p3 - str > 2)? "/": ", "; *p3; p3++) {
if(l < n)
buf[l] = *p3;
l++;
}
}
/* Encode attribute name. */
for(p3 = str; *p3; p3++) {
if(l < n)
buf[l] = *p3;
l++;
}
free((char *) str);
/* Generate equal sign. */
if(l < n)
buf[l] = '=';
l++;
/* Generate value. */
str = Curl_ASN1tostr(&value, 0);
if(!str)
return -1;
for(p3 = str; *p3; p3++) {
if(l < n)
buf[l] = *p3;
l++;
}
free((char *) str);
}
}
return l;
}
const char * Curl_DNtostr(curl_asn1Element * dn)
{
char * buf = (char *) NULL;
ssize_t n = encodeDN(buf, 0, dn);
/* Convert an ASN.1 distinguished name into a printable string.
Return the dynamically allocated string, or NULL if an error occurs. */
if(n >= 0) {
buf = malloc(n + 1);
if(buf) {
encodeDN(buf, n + 1, dn);
buf[n] = '\0';
}
}
return (const char *) buf;
}
/*
* X509 parser.
*/
void Curl_parseX509(curl_X509certificate * cert,
const char * beg, const char * end)
{
curl_asn1Element elem;
curl_asn1Element tbsCertificate;
const char * ccp;
static const char defaultVersion = 0; /* v1. */
/* ASN.1 parse an X509 certificate into structure subfields.
Syntax is assumed to have already been checked by the SSL backend.
See RFC 5280. */
cert->certificate.header = NULL;
cert->certificate.beg = beg;
cert->certificate.end = end;
/* Get the sequence content. */
Curl_getASN1Element(&elem, beg, end);
beg = elem.beg;
end = elem.end;
/* Get tbsCertificate. */
beg = Curl_getASN1Element(&tbsCertificate, beg, end);
/* Skip the signatureAlgorithm. */
beg = Curl_getASN1Element(&cert->signatureAlgorithm, beg, end);
/* Get the signatureValue. */
Curl_getASN1Element(&cert->signature, beg, end);
/* Parse TBSCertificate. */
beg = tbsCertificate.beg;
end = tbsCertificate.end;
/* Get optional version, get serialNumber. */
cert->version.header = NULL;
cert->version.beg = &defaultVersion;
cert->version.end = &defaultVersion + sizeof defaultVersion;;
beg = Curl_getASN1Element(&elem, beg, end);
if(elem.tag == 0) {
Curl_getASN1Element(&cert->version, elem.beg, elem.end);
beg = Curl_getASN1Element(&elem, beg, end);
}
cert->serialNumber = elem;
/* Get signature algorithm. */
beg = Curl_getASN1Element(&cert->signatureAlgorithm, beg, end);
/* Get issuer. */
beg = Curl_getASN1Element(&cert->issuer, beg, end);
/* Get notBefore and notAfter. */
beg = Curl_getASN1Element(&elem, beg, end);
ccp = Curl_getASN1Element(&cert->notBefore, elem.beg, elem.end);
Curl_getASN1Element(&cert->notAfter, ccp, elem.end);
/* Get subject. */
beg = Curl_getASN1Element(&cert->subject, beg, end);
/* Get subjectPublicKeyAlgorithm and subjectPublicKey. */
beg = Curl_getASN1Element(&cert->subjectPublicKeyInfo, beg, end);
ccp = Curl_getASN1Element(&cert->subjectPublicKeyAlgorithm,
cert->subjectPublicKeyInfo.beg,
cert->subjectPublicKeyInfo.end);
Curl_getASN1Element(&cert->subjectPublicKey, ccp,
cert->subjectPublicKeyInfo.end);
/* Get optional issuerUiqueID, subjectUniqueID and extensions. */
cert->issuerUniqueID.tag = cert->subjectUniqueID.tag = 0;
cert->extensions.tag = elem.tag = 0;
cert->issuerUniqueID.header = cert->subjectUniqueID.header = NULL;
cert->issuerUniqueID.beg = cert->issuerUniqueID.end = "";
cert->subjectUniqueID.beg = cert->subjectUniqueID.end = "";
cert->extensions.header = NULL;
cert->extensions.beg = cert->extensions.end = "";
if(beg < end)
beg = Curl_getASN1Element(&elem, beg, end);
if(elem.tag == 1) {
cert->issuerUniqueID = elem;
if(beg < end)
beg = Curl_getASN1Element(&elem, beg, end);
}
if(elem.tag == 2) {
cert->subjectUniqueID = elem;
if(beg < end)
beg = Curl_getASN1Element(&elem, beg, end);
}
if(elem.tag == 3)
Curl_getASN1Element(&cert->extensions, elem.beg, elem.end);
}
static size_t copySubstring(char * to, const char * from)
{
size_t i;
/* Copy at most 64-characters, terminate with a newline and returns the
effective number of stored characters. */
for(i = 0; i < 64; i++) {
to[i] = *from;
if(!*from++)
break;
}
to[i++] = '\n';
return i;
}
static const char * dumpAlgo(curl_asn1Element * param,
const char * beg, const char * end)
{
curl_asn1Element oid;
/* Get algorithm parameters and return algorithm name. */
beg = Curl_getASN1Element(&oid, beg, end);
param->header = NULL;
param->tag = 0;
param->beg = param->end = end;
if(beg < end)
Curl_getASN1Element(param, beg, end);
return OID2str(oid.beg, oid.end, TRUE);
}
static void do_pubkey_field(struct SessionHandle * data, int certnum,
const char * label, curl_asn1Element * elem)
{
const char * output;
/* Generate a certificate information record for the public key. */
output = Curl_ASN1tostr(elem, 0);
if(output) {
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, label, output);
if(!certnum)
infof(data, " %s: %s\n", label, output);
free((char *) output);
}
}
static void do_pubkey(struct SessionHandle * data, int certnum,
const char * algo, curl_asn1Element * param,
curl_asn1Element * pubkey)
{
curl_asn1Element elem;
curl_asn1Element pk;
const char * p;
const char * q;
unsigned long len;
unsigned int i;
/* Generate all information records for the public key. */
/* Get the public key (single element). */
Curl_getASN1Element(&pk, pubkey->beg + 1, pubkey->end);
if(curl_strequal(algo, "rsaEncryption")) {
p = Curl_getASN1Element(&elem, pk.beg, pk.end);
/* Compute key length. */
for(q = elem.beg; !*q && q < elem.end; q++)
;
len = (unsigned long)((elem.end - q) * 8);
if(len)
for(i = *(unsigned char *) q; !(i & 0x80); i <<= 1)
len--;
if(len > 32)
elem.beg = q; /* Strip leading zero bytes. */
if(!certnum)
infof(data, " RSA Public Key (%lu bits)\n", len);
if(data->set.ssl.certinfo) {
q = curl_maprintf("%lu", len);
if(q) {
Curl_ssl_push_certinfo(data, certnum, "RSA Public Key", q);
free((char *) q);
}
}
/* Generate coefficients. */
do_pubkey_field(data, certnum, "rsa(n)", &elem);
Curl_getASN1Element(&elem, p, pk.end);
do_pubkey_field(data, certnum, "rsa(e)", &elem);
}
else if(curl_strequal(algo, "dsa")) {
p = Curl_getASN1Element(&elem, param->beg, param->end);
do_pubkey_field(data, certnum, "dsa(p)", &elem);
p = Curl_getASN1Element(&elem, p, param->end);
do_pubkey_field(data, certnum, "dsa(q)", &elem);
Curl_getASN1Element(&elem, p, param->end);
do_pubkey_field(data, certnum, "dsa(g)", &elem);
do_pubkey_field(data, certnum, "dsa(pub_key)", &pk);
}
else if(curl_strequal(algo, "dhpublicnumber")) {
p = Curl_getASN1Element(&elem, param->beg, param->end);
do_pubkey_field(data, certnum, "dh(p)", &elem);
Curl_getASN1Element(&elem, param->beg, param->end);
do_pubkey_field(data, certnum, "dh(g)", &elem);
do_pubkey_field(data, certnum, "dh(pub_key)", &pk);
}
#if 0 /* Patent-encumbered. */
else if(curl_strequal(algo, "ecPublicKey")) {
/* Left TODO. */
}
#endif
}
CURLcode Curl_extract_certinfo(struct connectdata * conn,
int certnum,
const char * beg,
const char * end)
{
curl_X509certificate cert;
struct SessionHandle * data = conn->data;
curl_asn1Element param;
const char * ccp;
char * cp1;
size_t cl1;
char * cp2;
CURLcode result;
unsigned long version;
size_t i;
size_t j;
if(!data->set.ssl.certinfo)
if(certnum)
return CURLE_OK;
/* Prepare the certificate information for curl_easy_getinfo(). */
/* Extract the certificate ASN.1 elements. */
Curl_parseX509(&cert, beg, end);
/* Subject. */
ccp = Curl_DNtostr(&cert.subject);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Subject", ccp);
if(!certnum)
infof(data, "%2d Subject: %s\n", certnum, ccp);
free((char *) ccp);
/* Issuer. */
ccp = Curl_DNtostr(&cert.issuer);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Issuer", ccp);
if(!certnum)
infof(data, " Issuer: %s\n", ccp);
free((char *) ccp);
/* Version (always fits in less than 32 bits). */
version = 0;
for(ccp = cert.version.beg; ccp < cert.version.end; ccp++)
version = (version << 8) | *(const unsigned char *) ccp;
if(data->set.ssl.certinfo) {
ccp = curl_maprintf("%lx", version);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
Curl_ssl_push_certinfo(data, certnum, "Version", ccp);
free((char *) ccp);
}
if(!certnum)
infof(data, " Version: %lu (0x%lx)\n", version + 1, version);
/* Serial number. */
ccp = Curl_ASN1tostr(&cert.serialNumber, 0);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Serial Number", ccp);
if(!certnum)
infof(data, " Serial Number: %s\n", ccp);
free((char *) ccp);
/* Signature algorithm .*/
ccp = dumpAlgo(&param, cert.signatureAlgorithm.beg,
cert.signatureAlgorithm.end);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Signature Algorithm", ccp);
if(!certnum)
infof(data, " Signature Algorithm: %s\n", ccp);
free((char *) ccp);
/* Start Date. */
ccp = Curl_ASN1tostr(&cert.notBefore, 0);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Start Date", ccp);
if(!certnum)
infof(data, " Start Date: %s\n", ccp);
free((char *) ccp);
/* Expire Date. */
ccp = Curl_ASN1tostr(&cert.notAfter, 0);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Expire Date", ccp);
if(!certnum)
infof(data, " Expire Date: %s\n", ccp);
free((char *) ccp);
/* Public Key Algorithm. */
ccp = dumpAlgo(&param, cert.subjectPublicKeyAlgorithm.beg,
cert.subjectPublicKeyAlgorithm.end);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Public Key Algorithm", ccp);
if(!certnum)
infof(data, " Public Key Algorithm: %s\n", ccp);
do_pubkey(data, certnum, ccp, &param, &cert.subjectPublicKey);
free((char *) ccp);
/* TODO: extensions. */
/* Signature. */
ccp = Curl_ASN1tostr(&cert.signature, 0);
if(!ccp)
return CURLE_OUT_OF_MEMORY;
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Signature", ccp);
if(!certnum)
infof(data, " Signature: %s\n", ccp);
free((char *) ccp);
/* Generate PEM certificate. */
result = Curl_base64_encode(data, cert.certificate.beg,
cert.certificate.end - cert.certificate.beg,
&cp1, &cl1);
if(result)
return result;
/* Compute the number of characters in final certificate string. Format is:
-----BEGIN CERTIFICATE-----\n
<max 64 base64 characters>\n
.
.
.
-----END CERTIFICATE-----\n
*/
i = 28 + cl1 + (cl1 + 64 - 1) / 64 + 26;
cp2 = malloc(i + 1);
if(!cp2) {
free(cp1);
return CURLE_OUT_OF_MEMORY;
}
/* Build the certificate string. */
i = copySubstring(cp2, "-----BEGIN CERTIFICATE-----");
for(j = 0; j < cl1; j += 64)
i += copySubstring(cp2 + i, cp1 + j);
i += copySubstring(cp2 + i, "-----END CERTIFICATE-----");
cp2[i] = '\0';
free(cp1);
if(data->set.ssl.certinfo)
Curl_ssl_push_certinfo(data, certnum, "Cert", cp2);
if(!certnum)
infof(data, "%s\n", cp2);
free(cp2);
return CURLE_OK;
}
#endif /* USE_GSKIT or USE_NSS or USE_GNUTLS or USE_CYASSL */
#if defined(USE_GSKIT)
static const char * checkOID(const char * beg, const char * end,
const char * oid)
{
curl_asn1Element e;
const char * ccp;
const char * p;
bool matched;
/* Check if first ASN.1 element at `beg' is the given OID.
Return a pointer in the source after the OID if found, else NULL. */
ccp = Curl_getASN1Element(&e, beg, end);
if(!ccp || e.tag != CURL_ASN1_OBJECT_IDENTIFIER)
return (const char *) NULL;
p = OID2str(e.beg, e.end, FALSE);
if(!p)
return (const char *) NULL;
matched = !strcmp(p, oid);
free((char *) p);
return matched? ccp: (const char *) NULL;
}
CURLcode Curl_verifyhost(struct connectdata * conn,
const char * beg, const char * end)
{
struct SessionHandle * data = conn->data;
curl_X509certificate cert;
curl_asn1Element dn;
curl_asn1Element elem;
curl_asn1Element ext;
curl_asn1Element name;
const char * p;
const char * q;
char * dnsname;
int matched = -1;
size_t addrlen = (size_t) -1;
ssize_t len;
#ifdef ENABLE_IPV6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
/* Verify that connection server matches info in X509 certificate at
`beg'..`end'. */
if(!data->set.ssl.verifyhost)
return CURLE_OK;
if(!beg)
return CURLE_PEER_FAILED_VERIFICATION;
Curl_parseX509(&cert, beg, end);
/* Get the server IP address. */
#ifdef ENABLE_IPV6
if(conn->bits.ipv6_ip && Curl_inet_pton(AF_INET6, conn->host.name, &addr))
addrlen = sizeof(struct in6_addr);
else
#endif
if(Curl_inet_pton(AF_INET, conn->host.name, &addr))
addrlen = sizeof(struct in_addr);
/* Process extensions. */
for(p = cert.extensions.beg; p < cert.extensions.end && matched != 1;) {
p = Curl_getASN1Element(&ext, p, cert.extensions.end);
/* Check if extension is a subjectAlternativeName. */
ext.beg = checkOID(ext.beg, ext.end, sanOID);
if(ext.beg) {
ext.beg = Curl_getASN1Element(&elem, ext.beg, ext.end);
/* Skip critical if present. */
if(elem.tag == CURL_ASN1_BOOLEAN)
ext.beg = Curl_getASN1Element(&elem, ext.beg, ext.end);
/* Parse the octet string contents: is a single sequence. */
Curl_getASN1Element(&elem, elem.beg, elem.end);
/* Check all GeneralNames. */
for(q = elem.beg; matched != 1 && q < elem.end;) {
q = Curl_getASN1Element(&name, q, elem.end);
switch (name.tag) {
case 2: /* DNS name. */
len = utf8asn1str(&dnsname, CURL_ASN1_IA5_STRING,
name.beg, name.end);
if(len > 0 && (size_t)len == strlen(dnsname))
matched = Curl_cert_hostcheck(dnsname, conn->host.name);
else
matched = 0;
free(dnsname);
break;
case 7: /* IP address. */
matched = (size_t) (name.end - q) == addrlen &&
!memcmp(&addr, q, addrlen);
break;
}
}
}
}
switch (matched) {
case 1:
/* an alternative name matched the server hostname */
infof(data, "\t subjectAltName: %s matched\n", conn->host.dispname);
return CURLE_OK;
case 0:
/* an alternative name field existed, but didn't match and then
we MUST fail */
infof(data, "\t subjectAltName does not match %s\n", conn->host.dispname);
return CURLE_PEER_FAILED_VERIFICATION;
}
/* Process subject. */
name.header = NULL;
name.beg = name.end = "";
q = cert.subject.beg;
/* we have to look to the last occurrence of a commonName in the
distinguished one to get the most significant one. */
while(q < cert.subject.end) {
q = Curl_getASN1Element(&dn, q, cert.subject.end);
for(p = dn.beg; p < dn.end;) {
p = Curl_getASN1Element(&elem, p, dn.end);
/* We have a DN's AttributeTypeAndValue: check it in case it's a CN. */
elem.beg = checkOID(elem.beg, elem.end, cnOID);
if(elem.beg)
name = elem; /* Latch CN. */
}
}
/* Check the CN if found. */
if(!Curl_getASN1Element(&elem, name.beg, name.end))
failf(data, "SSL: unable to obtain common name from peer certificate");
else {
len = utf8asn1str(&dnsname, elem.tag, elem.beg, elem.end);
if(len < 0) {
free(dnsname);
return CURLE_OUT_OF_MEMORY;
}
if(strlen(dnsname) != (size_t) len) /* Nul byte in string ? */
failf(data, "SSL: illegal cert name field");
else if(Curl_cert_hostcheck((const char *) dnsname, conn->host.name)) {
infof(data, "\t common name: %s (matched)\n", dnsname);
free(dnsname);
return CURLE_OK;
}
else
failf(data, "SSL: certificate subject name '%s' does not match "
"target host name '%s'", dnsname, conn->host.dispname);
free(dnsname);
}
return CURLE_PEER_FAILED_VERIFICATION;
}
#endif /* USE_GSKIT */
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