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d141e7493b
it was using too soon. In a situation where pg_do_encoding_conversion is a no-op, this led to garbage data returned. In HEAD, also modify the code that's ensuring null termination to make it a tad more obvious what's happening.
346 lines
8.7 KiB
C
346 lines
8.7 KiB
C
/*
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* module for PostgreSQL to access client SSL certificate information
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*
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* Written by Victor B. Wagner <vitus@cryptocom.ru>, Cryptocom LTD
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* This file is distributed under BSD-style license.
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*
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* $PostgreSQL: pgsql/contrib/sslinfo/sslinfo.c,v 1.8 2008/11/10 14:57:38 tgl Exp $
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*/
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#include "postgres.h"
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#include "fmgr.h"
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#include "utils/numeric.h"
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#include "libpq/libpq-be.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "mb/pg_wchar.h"
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#include <openssl/x509.h>
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#include <openssl/asn1.h>
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PG_MODULE_MAGIC;
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Datum ssl_is_used(PG_FUNCTION_ARGS);
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Datum ssl_client_cert_present(PG_FUNCTION_ARGS);
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Datum ssl_client_serial(PG_FUNCTION_ARGS);
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Datum ssl_client_dn_field(PG_FUNCTION_ARGS);
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Datum ssl_issuer_field(PG_FUNCTION_ARGS);
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Datum ssl_client_dn(PG_FUNCTION_ARGS);
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Datum ssl_issuer_dn(PG_FUNCTION_ARGS);
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Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
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Datum X509_NAME_to_text(X509_NAME *name);
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Datum ASN1_STRING_to_text(ASN1_STRING *str);
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/*
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* Indicates whether current session uses SSL
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*
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* Function has no arguments. Returns bool. True if current session
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* is SSL session and false if it is local or non-ssl session.
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*/
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PG_FUNCTION_INFO_V1(ssl_is_used);
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Datum
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ssl_is_used(PG_FUNCTION_ARGS)
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{
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PG_RETURN_BOOL(MyProcPort->ssl != NULL);
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}
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/*
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* Indicates whether current client have provided a certificate
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*
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* Function has no arguments. Returns bool. True if current session
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* is SSL session and client certificate is verified, otherwise false.
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*/
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PG_FUNCTION_INFO_V1(ssl_client_cert_present);
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Datum
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ssl_client_cert_present(PG_FUNCTION_ARGS)
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{
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PG_RETURN_BOOL(MyProcPort->peer != NULL);
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}
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/*
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* Returns serial number of certificate used to establish current
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* session
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*
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* Function has no arguments. It returns the certificate serial
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* number as numeric or null if current session doesn't use SSL or if
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* SSL connection is established without sending client certificate.
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*/
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PG_FUNCTION_INFO_V1(ssl_client_serial);
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Datum
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ssl_client_serial(PG_FUNCTION_ARGS)
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{
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Datum result;
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Port *port = MyProcPort;
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X509 *peer = port->peer;
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ASN1_INTEGER *serial = NULL;
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BIGNUM *b;
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char *decimal;
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if (!peer)
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PG_RETURN_NULL();
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serial = X509_get_serialNumber(peer);
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b = ASN1_INTEGER_to_BN(serial, NULL);
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decimal = BN_bn2dec(b);
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BN_free(b);
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result = DirectFunctionCall3(numeric_in,
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CStringGetDatum(decimal),
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ObjectIdGetDatum(0),
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Int32GetDatum(-1));
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OPENSSL_free(decimal);
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return result;
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}
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/*
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* Converts OpenSSL ASN1_STRING structure into text
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*
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* Converts ASN1_STRING into text, converting all the characters into
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* current database encoding if possible. Any invalid characters are
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* replaced by question marks.
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*
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* Parameter: str - OpenSSL ASN1_STRING structure. Memory managment
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* of this structure is responsibility of caller.
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*
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* Returns Datum, which can be directly returned from a C language SQL
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* function.
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*/
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Datum
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ASN1_STRING_to_text(ASN1_STRING *str)
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{
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BIO *membuf;
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size_t size;
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char nullterm;
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char *sp;
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char *dp;
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text *result;
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membuf = BIO_new(BIO_s_mem());
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(void) BIO_set_close(membuf, BIO_CLOSE);
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ASN1_STRING_print_ex(membuf, str,
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((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
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| ASN1_STRFLGS_UTF8_CONVERT));
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/* ensure null termination of the BIO's content */
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nullterm = '\0';
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BIO_write(membuf, &nullterm, 1);
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size = BIO_get_mem_data(membuf, &sp);
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dp = (char *) pg_do_encoding_conversion((unsigned char *) sp,
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size - 1,
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PG_UTF8,
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GetDatabaseEncoding());
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result = cstring_to_text(dp);
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if (dp != sp)
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pfree(dp);
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BIO_free(membuf);
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PG_RETURN_TEXT_P(result);
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}
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/*
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* Returns specified field of specified X509_NAME structure
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*
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* Common part of ssl_client_dn and ssl_issuer_dn functions.
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*
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* Parameter: X509_NAME *name - either subject or issuer of certificate
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* Parameter: text fieldName - field name string like 'CN' or commonName
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* to be looked up in the OpenSSL ASN1 OID database
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*
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* Returns result of ASN1_STRING_to_text applied to appropriate
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* part of name
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*/
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Datum
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X509_NAME_field_to_text(X509_NAME *name, text *fieldName)
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{
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char *string_fieldname;
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int nid,
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index;
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ASN1_STRING *data;
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string_fieldname = text_to_cstring(fieldName);
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nid = OBJ_txt2nid(string_fieldname);
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if (nid == NID_undef)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid X.509 field name: \"%s\"",
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string_fieldname)));
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pfree(string_fieldname);
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index = X509_NAME_get_index_by_NID(name, nid, -1);
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if (index < 0)
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return (Datum) 0;
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data = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, index));
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return ASN1_STRING_to_text(data);
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}
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/*
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* Returns specified field of client certificate distinguished name
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*
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* Receives field name (like 'commonName' and 'emailAddress') and
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* returns appropriate part of certificate subject converted into
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* database encoding.
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*
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* Parameter: fieldname text - will be looked up in OpenSSL object
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* identifier database
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*
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* Returns text string with appropriate value.
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*
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* Throws an error if argument cannot be converted into ASN1 OID by
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* OpenSSL. Returns null if no client certificate is present, or if
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* there is no field with such name in the certificate.
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*/
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PG_FUNCTION_INFO_V1(ssl_client_dn_field);
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Datum
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ssl_client_dn_field(PG_FUNCTION_ARGS)
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{
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text *fieldname = PG_GETARG_TEXT_P(0);
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Datum result;
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if (!(MyProcPort->peer))
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PG_RETURN_NULL();
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result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
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if (!result)
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PG_RETURN_NULL();
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else
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return result;
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}
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/*
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* Returns specified field of client certificate issuer name
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*
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* Receives field name (like 'commonName' and 'emailAddress') and
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* returns appropriate part of certificate subject converted into
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* database encoding.
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*
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* Parameter: fieldname text - would be looked up in OpenSSL object
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* identifier database
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*
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* Returns text string with appropriate value.
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*
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* Throws an error if argument cannot be converted into ASN1 OID by
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* OpenSSL. Returns null if no client certificate is present, or if
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* there is no field with such name in the certificate.
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*/
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PG_FUNCTION_INFO_V1(ssl_issuer_field);
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Datum
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ssl_issuer_field(PG_FUNCTION_ARGS)
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{
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text *fieldname = PG_GETARG_TEXT_P(0);
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Datum result;
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if (!(MyProcPort->peer))
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PG_RETURN_NULL();
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result = X509_NAME_field_to_text(X509_get_issuer_name(MyProcPort->peer), fieldname);
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if (!result)
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PG_RETURN_NULL();
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else
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return result;
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}
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/*
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* Equivalent of X509_NAME_oneline that respects encoding
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*
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* This function converts X509_NAME structure to the text variable
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* converting all textual data into current database encoding.
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*
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* Parameter: X509_NAME *name X509_NAME structure to be converted
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*
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* Returns: text datum which contains string representation of
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* X509_NAME
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*/
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Datum
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X509_NAME_to_text(X509_NAME *name)
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{
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BIO *membuf = BIO_new(BIO_s_mem());
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int i,
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nid,
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count = X509_NAME_entry_count(name);
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X509_NAME_ENTRY *e;
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ASN1_STRING *v;
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const char *field_name;
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size_t size;
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char nullterm;
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char *sp;
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char *dp;
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text *result;
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(void) BIO_set_close(membuf, BIO_CLOSE);
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for (i = 0; i < count; i++)
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{
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e = X509_NAME_get_entry(name, i);
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nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
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v = X509_NAME_ENTRY_get_data(e);
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field_name = OBJ_nid2sn(nid);
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if (!field_name)
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field_name = OBJ_nid2ln(nid);
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BIO_printf(membuf, "/%s=", field_name);
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ASN1_STRING_print_ex(membuf, v,
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((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
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| ASN1_STRFLGS_UTF8_CONVERT));
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}
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/* ensure null termination of the BIO's content */
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nullterm = '\0';
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BIO_write(membuf, &nullterm, 1);
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size = BIO_get_mem_data(membuf, &sp);
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dp = (char *) pg_do_encoding_conversion((unsigned char *) sp,
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size - 1,
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PG_UTF8,
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GetDatabaseEncoding());
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result = cstring_to_text(dp);
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if (dp != sp)
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pfree(dp);
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BIO_free(membuf);
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PG_RETURN_TEXT_P(result);
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}
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/*
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* Returns current client certificate subject as one string
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*
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* This function returns distinguished name (subject) of the client
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* certificate used in the current SSL connection, converting it into
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* the current database encoding.
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*
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* Returns text datum.
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*/
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PG_FUNCTION_INFO_V1(ssl_client_dn);
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Datum
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ssl_client_dn(PG_FUNCTION_ARGS)
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{
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if (!(MyProcPort->peer))
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PG_RETURN_NULL();
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return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
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}
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/*
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* Returns current client certificate issuer as one string
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*
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* This function returns issuer's distinguished name of the client
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* certificate used in the current SSL connection, converting it into
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* the current database encoding.
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*
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* Returns text datum.
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*/
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PG_FUNCTION_INFO_V1(ssl_issuer_dn);
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Datum
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ssl_issuer_dn(PG_FUNCTION_ARGS)
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{
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if (!(MyProcPort->peer))
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PG_RETURN_NULL();
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return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
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}
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