Diff: SSL/library/x509_csr.c

Revision:

0:796d0f61a05b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SSL/library/x509_csr.c	Thu Sep 27 06:34:22 2018 +0000
@@ -0,0 +1,443 @@
+/*
+ *  X.509 Certificate Signing Request (CSR) parsing
+ *
+ *  Copyright (C) 2006-2014, Brainspark B.V.
+ *
+ *  This file is part of PolarSSL (http://www.polarssl.org)
+ *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ *  All rights reserved.
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+/*
+ *  The ITU-T X.509 standard defines a certificate format for PKI.
+ *
+ *  http://www.ietf.org/rfc/rfc3279.txt
+ *  http://www.ietf.org/rfc/rfc3280.txt
+ *
+ *  ftp://ftp.rsasecurity.com/pub/pkcs/ascii/pkcs-1v2.asc
+ *
+ *  http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
+ *  http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
+ */
+
+#if !defined(POLARSSL_CONFIG_FILE)
+#include "polarssl/config.h"
+#else
+#include POLARSSL_CONFIG_FILE
+#endif
+
+#if defined(POLARSSL_X509_CSR_PARSE_C)
+
+#include "polarssl/x509_csr.h"
+#include "polarssl/oid.h"
+#if defined(POLARSSL_PEM_PARSE_C)
+#include "polarssl/pem.h"
+#endif
+
+#if defined(POLARSSL_PLATFORM_C)
+#include "polarssl/platform.h"
+#else
+#define polarssl_malloc     malloc
+#define polarssl_free       free
+#endif
+
+#include <string.h>
+#include <stdlib.h>
+
+#if defined(POLARSSL_FS_IO) || defined(EFIX64) || defined(EFI32)
+#include <stdio.h>
+#endif
+
+/*
+ *  Version  ::=  INTEGER  {  v1(0)  }
+ */
+static int x509_csr_get_version( unsigned char **p,
+                             const unsigned char *end,
+                             int *ver )
+{
+    int ret;
+
+    if( ( ret = asn1_get_int( p, end, ver ) ) != 0 )
+    {
+        if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
+        {
+            *ver = 0;
+            return( 0 );
+        }
+
+        return( POLARSSL_ERR_X509_INVALID_VERSION + ret );
+    }
+
+    return( 0 );
+}
+
+/*
+ * Parse a CSR
+ */
+int x509_csr_parse( x509_csr *csr, const unsigned char *buf, size_t buflen )
+{
+    int ret;
+    size_t len;
+    unsigned char *p, *end;
+#if defined(POLARSSL_PEM_PARSE_C)
+    size_t use_len;
+    pem_context pem;
+#endif
+
+    /*
+     * Check for valid input
+     */
+    if( csr == NULL || buf == NULL )
+        return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
+
+    x509_csr_init( csr );
+
+#if defined(POLARSSL_PEM_PARSE_C)
+    pem_init( &pem );
+    ret = pem_read_buffer( &pem,
+                           "-----BEGIN CERTIFICATE REQUEST-----",
+                           "-----END CERTIFICATE REQUEST-----",
+                           buf, NULL, 0, &use_len );
+
+    if( ret == 0 )
+    {
+        /*
+         * Was PEM encoded, steal PEM buffer
+         */
+        p = pem.buf;
+        pem.buf = NULL;
+        len = pem.buflen;
+        pem_free( &pem );
+    }
+    else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
+    {
+        pem_free( &pem );
+        return( ret );
+    }
+    else
+#endif /* POLARSSL_PEM_PARSE_C */
+    {
+        /*
+         * nope, copy the raw DER data
+         */
+        p = (unsigned char *) polarssl_malloc( len = buflen );
+
+        if( p == NULL )
+            return( POLARSSL_ERR_X509_MALLOC_FAILED );
+
+        memcpy( p, buf, buflen );
+    }
+
+    csr->raw.p = p;
+    csr->raw.len = len;
+    end = p + len;
+
+    /*
+     *  CertificationRequest ::= SEQUENCE {
+     *       certificationRequestInfo CertificationRequestInfo,
+     *       signatureAlgorithm AlgorithmIdentifier,
+     *       signature          BIT STRING
+     *  }
+     */
+    if( ( ret = asn1_get_tag( &p, end, &len,
+            ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_INVALID_FORMAT );
+    }
+
+    if( len != (size_t) ( end - p ) )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_INVALID_FORMAT +
+                POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+    }
+
+    /*
+     *  CertificationRequestInfo ::= SEQUENCE {
+     */
+    csr->cri.p = p;
+
+    if( ( ret = asn1_get_tag( &p, end, &len,
+            ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_INVALID_FORMAT + ret );
+    }
+
+    end = p + len;
+    csr->cri.len = end - csr->cri.p;
+
+    /*
+     *  Version  ::=  INTEGER {  v1(0) }
+     */
+    if( ( ret = x509_csr_get_version( &p, end, &csr->version ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( ret );
+    }
+
+    csr->version++;
+
+    if( csr->version != 1 )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_UNKNOWN_VERSION );
+    }
+
+    /*
+     *  subject               Name
+     */
+    csr->subject_raw.p = p;
+
+    if( ( ret = asn1_get_tag( &p, end, &len,
+            ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_INVALID_FORMAT + ret );
+    }
+
+    if( ( ret = x509_get_name( &p, p + len, &csr->subject ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( ret );
+    }
+
+    csr->subject_raw.len = p - csr->subject_raw.p;
+
+    /*
+     *  subjectPKInfo SubjectPublicKeyInfo
+     */
+    if( ( ret = pk_parse_subpubkey( &p, end, &csr->pk ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( ret );
+    }
+
+    /*
+     *  attributes    [0] Attributes
+     */
+    if( ( ret = asn1_get_tag( &p, end, &len,
+            ASN1_CONSTRUCTED | ASN1_CONTEXT_SPECIFIC ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_INVALID_FORMAT + ret );
+    }
+    // TODO Parse Attributes / extension requests
+
+    p += len;
+
+    end = csr->raw.p + csr->raw.len;
+
+    /*
+     *  signatureAlgorithm   AlgorithmIdentifier,
+     *  signature            BIT STRING
+     */
+    if( ( ret = x509_get_alg_null( &p, end, &csr->sig_oid ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( ret );
+    }
+
+    if( ( ret = x509_get_sig_alg( &csr->sig_oid, &csr->sig_md,
+                                  &csr->sig_pk ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_UNKNOWN_SIG_ALG );
+    }
+
+    if( ( ret = x509_get_sig( &p, end, &csr->sig ) ) != 0 )
+    {
+        x509_csr_free( csr );
+        return( ret );
+    }
+
+    if( p != end )
+    {
+        x509_csr_free( csr );
+        return( POLARSSL_ERR_X509_INVALID_FORMAT +
+                POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+    }
+
+    return( 0 );
+}
+
+#if defined(POLARSSL_FS_IO)
+/*
+ * Load a CSR into the structure
+ */
+int x509_csr_parse_file( x509_csr *csr, const char *path )
+{
+    int ret;
+    size_t n;
+    unsigned char *buf;
+
+    if ( ( ret = x509_load_file( path, &buf, &n ) ) != 0 )
+        return( ret );
+
+    ret = x509_csr_parse( csr, buf, n );
+
+    memset( buf, 0, n + 1 );
+    polarssl_free( buf );
+
+    return( ret );
+}
+#endif /* POLARSSL_FS_IO */
+
+#if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \
+    !defined(EFI32)
+#include <stdarg.h>
+
+#if !defined vsnprintf
+#define vsnprintf _vsnprintf
+#endif // vsnprintf
+
+/*
+ * Windows _snprintf and _vsnprintf are not compatible to linux versions.
+ * Result value is not size of buffer needed, but -1 if no fit is possible.
+ *
+ * This fuction tries to 'fix' this by at least suggesting enlarging the
+ * size by 20.
+ */
+static int compat_snprintf(char *str, size_t size, const char *format, ...)
+{
+    va_list ap;
+    int res = -1;
+
+    va_start( ap, format );
+
+    res = vsnprintf( str, size, format, ap );
+
+    va_end( ap );
+
+    // No quick fix possible
+    if ( res < 0 )
+        return( (int) size + 20 );
+
+    return res;
+}
+
+#define snprintf compat_snprintf
+#endif /* _MSC_VER && !snprintf && !EFIX64 && !EFI32 */
+
+#define POLARSSL_ERR_DEBUG_BUF_TOO_SMALL    -2
+
+#define SAFE_SNPRINTF()                         \
+{                                               \
+    if( ret == -1 )                             \
+        return( -1 );                           \
+                                                \
+    if ( (unsigned int) ret > n ) {             \
+        p[n - 1] = '\0';                        \
+        return POLARSSL_ERR_DEBUG_BUF_TOO_SMALL;\
+    }                                           \
+                                                \
+    n -= (unsigned int) ret;                    \
+    p += (unsigned int) ret;                    \
+}
+
+#define BEFORE_COLON    14
+#define BC              "14"
+/*
+ * Return an informational string about the CSR.
+ */
+int x509_csr_info( char *buf, size_t size, const char *prefix,
+                   const x509_csr *csr )
+{
+    int ret;
+    size_t n;
+    char *p;
+    const char *desc;
+    char key_size_str[BEFORE_COLON];
+
+    p = buf;
+    n = size;
+
+    ret = snprintf( p, n, "%sCSR version   : %d",
+                               prefix, csr->version );
+    SAFE_SNPRINTF();
+
+    ret = snprintf( p, n, "\n%ssubject name  : ", prefix );
+    SAFE_SNPRINTF();
+    ret = x509_dn_gets( p, n, &csr->subject );
+    SAFE_SNPRINTF();
+
+    ret = snprintf( p, n, "\n%ssigned using  : ", prefix );
+    SAFE_SNPRINTF();
+
+    ret = oid_get_sig_alg_desc( &csr->sig_oid, &desc );
+    if( ret != 0 )
+        ret = snprintf( p, n, "???"  );
+    else
+        ret = snprintf( p, n, "%s", desc );
+    SAFE_SNPRINTF();
+
+    if( ( ret = x509_key_size_helper( key_size_str, BEFORE_COLON,
+                                      pk_get_name( &csr->pk ) ) ) != 0 )
+    {
+        return( ret );
+    }
+
+    ret = snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
+                          (int) pk_get_size( &csr->pk ) );
+    SAFE_SNPRINTF();
+
+    return( (int) ( size - n ) );
+}
+
+/*
+ * Initialize a CSR
+ */
+void x509_csr_init( x509_csr *csr )
+{
+    memset( csr, 0, sizeof(x509_csr) );
+}
+
+/*
+ * Unallocate all CSR data
+ */
+void x509_csr_free( x509_csr *csr )
+{
+    x509_name *name_cur;
+    x509_name *name_prv;
+
+    if( csr == NULL )
+        return;
+
+    pk_free( &csr->pk );
+
+    name_cur = csr->subject.next;
+    while( name_cur != NULL )
+    {
+        name_prv = name_cur;
+        name_cur = name_cur->next;
+        memset( name_prv, 0, sizeof( x509_name ) );
+        polarssl_free( name_prv );
+    }
+
+    if( csr->raw.p != NULL )
+    {
+        memset( csr->raw.p, 0, csr->raw.len );
+        polarssl_free( csr->raw.p );
+    }
+
+    memset( csr, 0, sizeof( x509_csr ) );
+}
+
+#endif /* POLARSSL_X509_CSR_PARSE_C */
+
+