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haproxy/src/ssl_utils.c

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/*
* Utility functions for SSL:
* Mostly generic functions that retrieve information from certificates
*
* Copyright (C) 2012 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
* Copyright (C) 2020 HAProxy Technologies, William Lallemand <wlallemand@haproxy.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <haproxy/api.h>
#include <haproxy/buf-t.h>
#include <haproxy/chunk.h>
#include <haproxy/openssl-compat.h>
#include <haproxy/ssl_sock.h>
#include <haproxy/ssl_utils.h>
/* fill a buffer with the algorithm and size of a public key */
int cert_get_pkey_algo(X509 *crt, struct buffer *out)
{
int bits = 0;
int sig = TLSEXT_signature_anonymous;
int len = -1;
EVP_PKEY *pkey;
pkey = X509_get_pubkey(crt);
if (pkey) {
bits = EVP_PKEY_bits(pkey);
switch(EVP_PKEY_base_id(pkey)) {
case EVP_PKEY_RSA:
sig = TLSEXT_signature_rsa;
break;
case EVP_PKEY_EC:
sig = TLSEXT_signature_ecdsa;
break;
case EVP_PKEY_DSA:
sig = TLSEXT_signature_dsa;
break;
}
EVP_PKEY_free(pkey);
}
switch(sig) {
case TLSEXT_signature_rsa:
len = chunk_printf(out, "RSA%d", bits);
break;
case TLSEXT_signature_ecdsa:
len = chunk_printf(out, "EC%d", bits);
break;
case TLSEXT_signature_dsa:
len = chunk_printf(out, "DSA%d", bits);
break;
default:
return 0;
}
if (len < 0)
return 0;
return 1;
}
/* Extract a serial from a cert, and copy it to a chunk.
* Returns 1 if serial is found and copied, 0 if no serial found and
* -1 if output is not large enough.
*/
int ssl_sock_get_serial(X509 *crt, struct buffer *out)
{
ASN1_INTEGER *serial;
serial = X509_get_serialNumber(crt);
if (!serial)
return 0;
if (out->size < serial->length)
return -1;
memcpy(out->area, serial->data, serial->length);
out->data = serial->length;
return 1;
}
/* Extract a cert to der, and copy it to a chunk.
* Returns 1 if the cert is found and copied, 0 on der conversion failure
* and -1 if the output is not large enough.
*/
int ssl_sock_crt2der(X509 *crt, struct buffer *out)
{
int len;
unsigned char *p = (unsigned char *) out->area;
len = i2d_X509(crt, NULL);
if (len <= 0)
return 1;
if (out->size < len)
return -1;
i2d_X509(crt, &p);
out->data = len;
return 1;
}
/* Copy Date in ASN1_UTCTIME format in struct buffer out.
* Returns 1 if serial is found and copied, 0 if no valid time found
* and -1 if output is not large enough.
*/
int ssl_sock_get_time(ASN1_TIME *tm, struct buffer *out)
{
if (tm->type == V_ASN1_GENERALIZEDTIME) {
ASN1_GENERALIZEDTIME *gentm = (ASN1_GENERALIZEDTIME *)tm;
if (gentm->length < 12)
return 0;
if (gentm->data[0] != 0x32 || gentm->data[1] != 0x30)
return 0;
if (out->size < gentm->length-2)
return -1;
memcpy(out->area, gentm->data+2, gentm->length-2);
out->data = gentm->length-2;
return 1;
}
else if (tm->type == V_ASN1_UTCTIME) {
ASN1_UTCTIME *utctm = (ASN1_UTCTIME *)tm;
if (utctm->length < 10)
return 0;
if (utctm->data[0] >= 0x35)
return 0;
if (out->size < utctm->length)
return -1;
memcpy(out->area, utctm->data, utctm->length);
out->data = utctm->length;
return 1;
}
return 0;
}
/* Extract an entry from a X509_NAME and copy its value to an output chunk.
* Returns 1 if entry found, 0 if entry not found, or -1 if output not large enough.
*/
int ssl_sock_get_dn_entry(X509_NAME *a, const struct buffer *entry, int pos,
struct buffer *out)
{
X509_NAME_ENTRY *ne;
ASN1_OBJECT *obj;
ASN1_STRING *data;
const unsigned char *data_ptr;
int data_len;
int i, j, n;
int cur = 0;
const char *s;
char tmp[128];
int name_count;
name_count = X509_NAME_entry_count(a);
out->data = 0;
for (i = 0; i < name_count; i++) {
if (pos < 0)
j = (name_count-1) - i;
else
j = i;
ne = X509_NAME_get_entry(a, j);
obj = X509_NAME_ENTRY_get_object(ne);
data = X509_NAME_ENTRY_get_data(ne);
data_ptr = ASN1_STRING_get0_data(data);
data_len = ASN1_STRING_length(data);
n = OBJ_obj2nid(obj);
if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {
i2t_ASN1_OBJECT(tmp, sizeof(tmp), obj);
s = tmp;
}
if (chunk_strcasecmp(entry, s) != 0)
continue;
if (pos < 0)
cur--;
else
cur++;
if (cur != pos)
continue;
if (data_len > out->size)
return -1;
memcpy(out->area, data_ptr, data_len);
out->data = data_len;
return 1;
}
return 0;
}
/*
* Extract the DN in the specified format from the X509_NAME and copy result to a chunk.
* Currently supports rfc2253 for returning LDAP V3 DNs.
* Returns 1 if dn entries exist, 0 if no dn entry was found.
*/
int ssl_sock_get_dn_formatted(X509_NAME *a, const struct buffer *format, struct buffer *out)
{
BIO *bio = NULL;
int ret = 0;
int data_len = 0;
if (chunk_strcmp(format, "rfc2253") == 0) {
bio = BIO_new(BIO_s_mem());
if (bio == NULL)
goto out;
if (X509_NAME_print_ex(bio, a, 0, XN_FLAG_RFC2253) < 0)
goto out;
if ((data_len = BIO_read(bio, out->area, out->size)) <= 0)
goto out;
out->data = data_len;
ret = 1;
}
out:
if (bio)
BIO_free(bio);
return ret;
}
/* Extract and format full DN from a X509_NAME and copy result into a chunk
* Returns 1 if dn entries exits, 0 if no dn entry found or -1 if output is not large enough.
*/
int ssl_sock_get_dn_oneline(X509_NAME *a, struct buffer *out)
{
X509_NAME_ENTRY *ne;
ASN1_OBJECT *obj;
ASN1_STRING *data;
const unsigned char *data_ptr;
int data_len;
int i, n, ln;
int l = 0;
const char *s;
char *p;
char tmp[128];
int name_count;
name_count = X509_NAME_entry_count(a);
out->data = 0;
p = out->area;
for (i = 0; i < name_count; i++) {
ne = X509_NAME_get_entry(a, i);
obj = X509_NAME_ENTRY_get_object(ne);
data = X509_NAME_ENTRY_get_data(ne);
data_ptr = ASN1_STRING_get0_data(data);
data_len = ASN1_STRING_length(data);
n = OBJ_obj2nid(obj);
if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {
i2t_ASN1_OBJECT(tmp, sizeof(tmp), obj);
s = tmp;
}
ln = strlen(s);
l += 1 + ln + 1 + data_len;
if (l > out->size)
return -1;
out->data = l;
*(p++)='/';
memcpy(p, s, ln);
p += ln;
*(p++)='=';
memcpy(p, data_ptr, data_len);
p += data_len;
}
if (!out->data)
return 0;
return 1;
}
extern int ssl_client_crt_ref_index;
/*
* This function fetches the SSL certificate for a specific connection (either
* client certificate or server certificate depending on the cert_peer
* parameter).
* When trying to get the peer certificate from the server side, we first try to
* use the dedicated SSL_get_peer_certificate function, but we fall back to
* trying to get the client certificate reference that might have been stored in
* the SSL structure's ex_data during the verification process.
* Returns NULL in case of failure.
*/
X509* ssl_sock_get_peer_certificate(SSL *ssl)
{
X509* cert;
cert = SSL_get_peer_certificate(ssl);
/* Get the client certificate reference stored in the SSL
* structure's ex_data during the verification process. */
if (!cert) {
cert = SSL_get_ex_data(ssl, ssl_client_crt_ref_index);
if (cert)
X509_up_ref(cert);
}
return cert;
}
/*
* This function fetches the x509* for the root CA of client certificate
* from the verified chain. We use the SSL_get0_verified_chain and get the
* last certificate in the x509 stack.
*
* Returns NULL in case of failure.
*/
#ifdef HAVE_SSL_get0_verified_chain
X509* ssl_sock_get_verified_chain_root(SSL *ssl)
{
STACK_OF(X509) *chain = NULL;
X509 *crt = NULL;
int i;
chain = SSL_get0_verified_chain(ssl);
if (!chain)
return NULL;
for (i = 0; i < sk_X509_num(chain); i++) {
crt = sk_X509_value(chain, i);
if (X509_check_issued(crt, crt) == X509_V_OK)
break;
}
return crt;
}
#endif
/*
* Take an OpenSSL version in text format and return a numeric openssl version
* Return 0 if it failed to parse the version
*
* https://www.openssl.org/docs/man1.1.1/man3/OPENSSL_VERSION_NUMBER.html
*
* MNNFFPPS: major minor fix patch status
*
* The status nibble has one of the values 0 for development, 1 to e for betas
* 1 to 14, and f for release.
*
* for example
*
* 0x0090821f 0.9.8zh
* 0x1000215f 1.0.2u
* 0x30000000 3.0.0-alpha17
* 0x30000002 3.0.0-beta2
* 0x3000000e 3.0.0-beta14
* 0x3000000f 3.0.0
*/
unsigned int openssl_version_parser(const char *version)
{
unsigned int numversion;
unsigned int major = 0, minor = 0, fix = 0, patch = 0, status = 0;
char *p, *end;
p = (char *)version;
if (!p || !*p)
return 0;
major = strtol(p, &end, 10);
if (*end != '.' || major > 0xf)
goto error;
p = end + 1;
minor = strtol(p, &end, 10);
if (*end != '.' || minor > 0xff)
goto error;
p = end + 1;
fix = strtol(p, &end, 10);
if (fix > 0xff)
goto error;
p = end;
if (!*p) {
/* end of the string, that's a release */
status = 0xf;
} else if (*p == '-') {
/* after the hyphen, only the beta will increment the status
* counter, all others versions will be considered as "dev" and
* does not increment anything */
p++;
if (!strncmp(p, "beta", 4)) {
p += 4;
status = strtol(p, &end, 10);
if (status > 14)
goto error;
}
} else {
/* that's a patch release */
patch = 1;
/* add the value of each letter */
while (*p) {
patch += (*p & ~0x20) - 'A';
p++;
}
status = 0xf;
}
end:
numversion = ((major & 0xf) << 28) | ((minor & 0xff) << 20) | ((fix & 0xff) << 12) | ((patch & 0xff) << 4) | (status & 0xf);
return numversion;
error:
return 0;
}
/* Exclude GREASE (RFC8701) values from input buffer */
void exclude_tls_grease(char *input, int len, struct buffer *output)
{
int ptr = 0;
while (ptr < len - 1) {
if (input[ptr] != input[ptr+1] || (input[ptr] & 0x0f) != 0x0a) {
if (output->data <= output->size - 2) {
memcpy(output->area + output->data, input + ptr, 2);
output->data += 2;
} else
break;
}
ptr += 2;
}
if (output->size - output->data > 0 && len - ptr > 0)
output->area[output->data++] = input[ptr];
}
/*
* The following generates an array <x509_v_codes> in which the X509_V_ERR_*
* codes are populated with there string equivalent. Depending on the version
* of the SSL library, some code does not exist, these will be populated as
* "-1" in the array.
*
* The list was taken from
* https://github.com/openssl/openssl/blob/master/include/openssl/x509_vfy.h.in
* and must be updated when new constant are introduced.
*/
#undef _Q
#define _Q(x) (#x)
#undef V
#define V(x) { .code = -1, .value = _Q(x), .string = #x }
static struct x509_v_codes {
int code; // integer value of the code or -1 if undefined
const char *value; // value of the macro as a string or its name
const char *string; // name of the macro
} x509_v_codes[] = {
V(X509_V_OK),
V(X509_V_ERR_UNSPECIFIED),
V(X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT),
V(X509_V_ERR_UNABLE_TO_GET_CRL),
V(X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE),
V(X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE),
V(X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY),
V(X509_V_ERR_CERT_SIGNATURE_FAILURE),
V(X509_V_ERR_CRL_SIGNATURE_FAILURE),
V(X509_V_ERR_CERT_NOT_YET_VALID),
V(X509_V_ERR_CERT_HAS_EXPIRED),
V(X509_V_ERR_CRL_NOT_YET_VALID),
V(X509_V_ERR_CRL_HAS_EXPIRED),
V(X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD),
V(X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD),
V(X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD),
V(X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD),
V(X509_V_ERR_OUT_OF_MEM),
V(X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT),
V(X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN),
V(X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY),
V(X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE),
V(X509_V_ERR_CERT_CHAIN_TOO_LONG),
V(X509_V_ERR_CERT_REVOKED),
V(X509_V_ERR_NO_ISSUER_PUBLIC_KEY),
V(X509_V_ERR_PATH_LENGTH_EXCEEDED),
V(X509_V_ERR_INVALID_PURPOSE),
V(X509_V_ERR_CERT_UNTRUSTED),
V(X509_V_ERR_CERT_REJECTED),
V(X509_V_ERR_SUBJECT_ISSUER_MISMATCH),
V(X509_V_ERR_AKID_SKID_MISMATCH),
V(X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH),
V(X509_V_ERR_KEYUSAGE_NO_CERTSIGN),
V(X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER),
V(X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION),
V(X509_V_ERR_KEYUSAGE_NO_CRL_SIGN),
V(X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION),
V(X509_V_ERR_INVALID_NON_CA),
V(X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED),
V(X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE),
V(X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED),
V(X509_V_ERR_INVALID_EXTENSION),
V(X509_V_ERR_INVALID_POLICY_EXTENSION),
V(X509_V_ERR_NO_EXPLICIT_POLICY),
V(X509_V_ERR_DIFFERENT_CRL_SCOPE),
V(X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE),
V(X509_V_ERR_UNNESTED_RESOURCE),
V(X509_V_ERR_PERMITTED_VIOLATION),
V(X509_V_ERR_EXCLUDED_VIOLATION),
V(X509_V_ERR_SUBTREE_MINMAX),
V(X509_V_ERR_APPLICATION_VERIFICATION),
V(X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE),
V(X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX),
V(X509_V_ERR_UNSUPPORTED_NAME_SYNTAX),
V(X509_V_ERR_CRL_PATH_VALIDATION_ERROR),
V(X509_V_ERR_PATH_LOOP),
V(X509_V_ERR_SUITE_B_INVALID_VERSION),
V(X509_V_ERR_SUITE_B_INVALID_ALGORITHM),
V(X509_V_ERR_SUITE_B_INVALID_CURVE),
V(X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM),
V(X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED),
V(X509_V_ERR_SUITE_B_CANNOT_SIGN_P_384_WITH_P_256),
V(X509_V_ERR_HOSTNAME_MISMATCH),
V(X509_V_ERR_EMAIL_MISMATCH),
V(X509_V_ERR_IP_ADDRESS_MISMATCH),
V(X509_V_ERR_DANE_NO_MATCH),
V(X509_V_ERR_EE_KEY_TOO_SMALL),
V(X509_V_ERR_CA_KEY_TOO_SMALL),
V(X509_V_ERR_CA_MD_TOO_WEAK),
V(X509_V_ERR_INVALID_CALL),
V(X509_V_ERR_STORE_LOOKUP),
V(X509_V_ERR_NO_VALID_SCTS),
V(X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION),
V(X509_V_ERR_OCSP_VERIFY_NEEDED),
V(X509_V_ERR_OCSP_VERIFY_FAILED),
V(X509_V_ERR_OCSP_CERT_UNKNOWN),
V(X509_V_ERR_UNSUPPORTED_SIGNATURE_ALGORITHM),
V(X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH),
V(X509_V_ERR_SIGNATURE_ALGORITHM_INCONSISTENCY),
V(X509_V_ERR_INVALID_CA),
V(X509_V_ERR_PATHLEN_INVALID_FOR_NON_CA),
V(X509_V_ERR_PATHLEN_WITHOUT_KU_KEY_CERT_SIGN),
V(X509_V_ERR_KU_KEY_CERT_SIGN_INVALID_FOR_NON_CA),
V(X509_V_ERR_ISSUER_NAME_EMPTY),
V(X509_V_ERR_SUBJECT_NAME_EMPTY),
V(X509_V_ERR_MISSING_AUTHORITY_KEY_IDENTIFIER),
V(X509_V_ERR_MISSING_SUBJECT_KEY_IDENTIFIER),
V(X509_V_ERR_EMPTY_SUBJECT_ALT_NAME),
V(X509_V_ERR_EMPTY_SUBJECT_SAN_NOT_CRITICAL),
V(X509_V_ERR_CA_BCONS_NOT_CRITICAL),
V(X509_V_ERR_AUTHORITY_KEY_IDENTIFIER_CRITICAL),
V(X509_V_ERR_SUBJECT_KEY_IDENTIFIER_CRITICAL),
V(X509_V_ERR_CA_CERT_MISSING_KEY_USAGE),
V(X509_V_ERR_EXTENSIONS_REQUIRE_VERSION_3),
V(X509_V_ERR_EC_KEY_EXPLICIT_PARAMS),
{ 0, NULL, NULL },
};
/*
* Return the X509_V_ERR code corresponding to the name of the constant.
* See https://github.com/openssl/openssl/blob/master/include/openssl/x509_vfy.h.in
* If not found, return -1
*/
int x509_v_err_str_to_int(const char *str)
{
int i;
for (i = 0; x509_v_codes[i].string; i++) {
if (strcmp(str, x509_v_codes[i].string) == 0) {
return x509_v_codes[i].code;
}
}
return -1;
}
/*
* Return the constant name corresponding to the X509_V_ERR code
* See https://github.com/openssl/openssl/blob/master/include/openssl/x509_vfy.h.in
* If not found, return NULL;
*/
const char *x509_v_err_int_to_str(int code)
{
int i;
if (code == -1)
return NULL;
for (i = 0; x509_v_codes[i].string; i++) {
if (x509_v_codes[i].code == code) {
return x509_v_codes[i].string;
}
}
return NULL;
}
void init_x509_v_err_tab(void)
{
int i;
for (i = 0; x509_v_codes[i].string; i++) {
/* either the macro exists or it's equal to its own name */
if (strcmp(x509_v_codes[i].string, x509_v_codes[i].value) == 0)
continue;
x509_v_codes[i].code = atoi(x509_v_codes[i].value);
}
}
INITCALL0(STG_REGISTER, init_x509_v_err_tab);
/*
* This function returns the number of seconds elapsed
* since the Epoch, 1970-01-01 00:00:00 +0000 (UTC) and the
* date presented un ASN1_GENERALIZEDTIME.
*
* In parsing error case, it returns -1.
*/
long asn1_generalizedtime_to_epoch(ASN1_GENERALIZEDTIME *d)
{
long epoch;
char *p, *end;
const unsigned short month_offset[12] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
unsigned long year, month;
if (!d || (d->type != V_ASN1_GENERALIZEDTIME)) return -1;
p = (char *)d->data;
end = p + d->length;
if (end - p < 4) return -1;
year = 1000 * (p[0] - '0') + 100 * (p[1] - '0') + 10 * (p[2] - '0') + p[3] - '0';
p += 4;
if (end - p < 2) return -1;
month = 10 * (p[0] - '0') + p[1] - '0';
if (month < 1 || month > 12) return -1;
/* Compute the number of seconds since 1 jan 1970 and the beginning of current month
We consider leap years and the current month (<marsh or not) */
epoch = ( ((year - 1970) * 365)
+ ((year - (month < 3)) / 4 - (year - (month < 3)) / 100 + (year - (month < 3)) / 400)
- ((1970 - 1) / 4 - (1970 - 1) / 100 + (1970 - 1) / 400)
+ month_offset[month-1]
) * 24 * 60 * 60;
p += 2;
if (end - p < 2) return -1;
/* Add the number of seconds of completed days of current month */
epoch += (10 * (p[0] - '0') + p[1] - '0' - 1) * 24 * 60 * 60;
p += 2;
if (end - p < 2) return -1;
/* Add the completed hours of the current day */
epoch += (10 * (p[0] - '0') + p[1] - '0') * 60 * 60;
p += 2;
if (end - p < 2) return -1;
/* Add the completed minutes of the current hour */
epoch += (10 * (p[0] - '0') + p[1] - '0') * 60;
p += 2;
if (p == end) return -1;
/* Test if there is available seconds */
if (p[0] < '0' || p[0] > '9')
goto nosec;
if (end - p < 2) return -1;
/* Add the seconds of the current minute */
epoch += 10 * (p[0] - '0') + p[1] - '0';
p += 2;
if (p == end) return -1;
/* Ignore seconds float part if present */
if (p[0] == '.') {
do {
if (++p == end) return -1;
} while (p[0] >= '0' && p[0] <= '9');
}
nosec:
if (p[0] == 'Z') {
if (end - p != 1) return -1;
return epoch;
}
else if (p[0] == '+') {
if (end - p != 5) return -1;
/* Apply timezone offset */
return epoch - ((10 * (p[1] - '0') + p[2] - '0') * 60 * 60 + (10 * (p[3] - '0') + p[4] - '0')) * 60;
}
else if (p[0] == '-') {
if (end - p != 5) return -1;
/* Apply timezone offset */
return epoch + ((10 * (p[1] - '0') + p[2] - '0') * 60 * 60 + (10 * (p[3] - '0') + p[4] - '0')) * 60;
}
return -1;
}
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