/*****************************************************************************
* vlc_update.h: VLC update and plugins download
*****************************************************************************
- * Copyright (C) 2005 the VideoLAN team
+ * Copyright © 2005-2007 the VideoLAN team
* $Id$
*
* Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
+ * Rafaël Carré <funman@videolanorg>
*
* 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
#error You are not libvlc or one of its plugins. You cannot include this file
#endif
+#ifdef UPDATE_CHECK
+
#ifndef _VLC_UPDATE_H
#define _VLC_UPDATE_H
#include <vlc/vlc.h>
+#include <vlc_stream.h> /* key & signature downloading */
+#include <vlc_strings.h> /* b64 decoding */
+#include <vlc_charset.h> /* utf8_fopen() */
+#include <gcrypt.h> /* cryptography and digest algorithms */
+
/**
* \defgroup update Update
*
* @{
*/
+enum /* Public key algorithms */
+{
+ /* we will only use DSA public keys */
+ PUBLIC_KEY_ALGO_DSA = 0x11
+};
+
+enum /* Digest algorithms */
+{
+ /* and DSA use SHA-1 digest */
+ DIGEST_ALGO_SHA1 = 0x02
+};
+
+enum /* Packet types */
+{
+ SIGNATURE_PACKET = 0x02,
+ PUBLIC_KEY_PACKET = 0x06,
+ USER_ID_PACKET = 0x0d
+};
+
+enum /* Signature types */
+{
+ BINARY_SIGNATURE = 0x00,
+ TEXT_SIGNATURE = 0x01,
+
+ /* Public keys signatures */
+ GENERIC_KEY_SIGNATURE = 0x10, /* No assumption of verification */
+ PERSONA_KEY_SIGNATURE = 0x11, /* No verification has been made */
+ CASUAL_KEY_SIGNATURE = 0x12, /* Some casual verification */
+ POSITIVE_KEY_SIGNATURE = 0x13 /* Substantial verification */
+};
+
+
+enum /* Signature subpacket types */
+{
+ ISSUER_SUBPACKET = 0x10
+};
+
+
+
+struct public_key_packet_t
+{ /* a public key packet (DSA/SHA-1) is 418 bytes */
+
+ uint8_t version; /* we use only version 4 */
+ uint8_t timestamp[4]; /* creation time of the key */
+ uint8_t algo; /* we only use DSA */
+ /* the multi precision integers, with their 2 bytes length header */
+ uint8_t p[2+128];
+ uint8_t q[2+20];
+ uint8_t g[2+128];
+ uint8_t y[2+128];
+};
+
+/* used for public key signatures */
+struct signature_packet_v4_t
+{ /* hashed_data or unhashed_data can be empty, so the signature packet is
+ * theorically at least 54 bytes long, but always more than that. */
+
+ uint8_t version;
+ uint8_t type;
+ uint8_t public_key_algo;
+ uint8_t digest_algo;
+ uint8_t hashed_data_len[2];
+ uint8_t *hashed_data;
+ uint8_t unhashed_data_len[2];
+ uint8_t *unhashed_data;
+ uint8_t hash_verification[2];
+
+ /* The part below is made of consecutive MPIs, their number and size being
+ * public-key-algorithm dependant.
+ * But since we use DSA signatures only, we fix it. */
+ uint8_t r[2+20];
+ uint8_t s[2+20];
+};
+
+/* Used for binary document signatures (to be compatible with older software)
+ * DSA/SHA-1 is always 65 bytes */
+struct signature_packet_v3_t
+{
+ uint8_t header[2];
+ uint8_t version; /* 3 */
+ uint8_t hashed_data_len; /* MUST be 5 */
+ uint8_t type;
+ uint8_t timestamp[4]; /* 4 bytes scalar number */
+ uint8_t issuer_longid[8]; /* The key which signed the document */
+ uint8_t public_key_algo; /* we only know about DSA */
+ uint8_t digest_algo; /* and his little sister SHA-1 */
+ uint8_t hash_verification[2];/* the 2 1st bytes of the SHA-1 hash */
+
+ /* The part below is made of consecutive MPIs, their number and size being
+ * public-key-algorithm dependant.
+ * But since we use DSA signatures only, we fix it. */
+ uint8_t r[2+20];
+ uint8_t s[2+20];
+};
+
+typedef struct public_key_packet_t public_key_packet_t;
+typedef struct signature_packet_v4_t signature_packet_v4_t;
+typedef struct signature_packet_v3_t signature_packet_v3_t;
+
+struct public_key_t
+{
+ uint8_t longid[8]; /* Long id */
+ uint8_t *psz_username; /* USER ID */
+
+ public_key_packet_t key; /* Public key packet */
+
+ signature_packet_v4_t sig; /* Signature packet, by the embedded key */
+};
+
+typedef struct public_key_t public_key_t;
+
+/* We trust this public key, and by extension, also keys signed by it. */
+
+//#define OLD 1 //Define OLD to use Videolan Key 2006, to test public key download
+
+static uint8_t videolan_public_key_longid[8] = {
+#ifdef OLD
+ 0xC3, 0x67, 0xD8, 0xB9, 0x81, 0xCA, 0xCA, 0x84
+#else
+ 0x90, 0x28, 0x17, 0xE4, 0xAA, 0x5F, 0x4D, 0xE6
+#endif
+};
+
+static uint8_t videolan_public_key[] = {
+#ifdef OLD
+"-----BEGIN PGP PUBLIC KEY BLOCK-----\n"
+"Version: GnuPG v2.0.4 (FreeBSD)\n"
+"\n"
+"mQGiBEPBV9IRBADqm3i6AnMyZ2/iowBPZJrP3bwhcqx9EhJR5/N8Pz+QjhvLsY5P\n"
+"efH1381RlEk33dl0vEvKULFstqT2GO+vtdoE+35tf1YlYFvxy23qn3Gsn2IMM6pl\n"
+"e0AatBnxzD1Vtlh7+Xhm0PvGJilZeg/MamEK2A8hgwhj3aGxVfzdtkQ1HwCg9XIo\n"
+"PZ8x5W0r6sfRXYmCDR06NFEEANRY98cFWJdvBmutLzoSC9y7eLxyGzKofs7ikxKg\n"
+"myT1o3eraeCoZc+mIbZG4cZA9UqL/fmqZa/3gvnvDEzoI8u7u7gL6bu499XAnzVd\n"
+"VV4cwvzgAPnMiqhi0jNWlXbt4dyZ+sWDhkL+ivrg3HsRU9xQUvYv54YQT0FxmR+E\n"
+"yTnjA/9KoPRPwAWy7Q4R24CNSjMz5+075J2LUz0QDjTzcLh6Y/gI7oxNGsgsmLQ8\n"
+"LMgtPZPbNw1FP6c6LMdUsLBCuCBKr7K3qOMubZc4694kB28bnpvP9EiHqvF8XiuY\n"
+"lNNHzqFVCufAuSceg4B+INczF46i0KUT0xhsIkw0KMfofac+g7Q9VmlkZW9MQU4g\n"
+"QXV0b21hdGljIFNpZ25pbmcgS2V5ICgyMDA2KSA8dmlkZW9sYW5AdmlkZW9sYW4u\n"
+"b3JnPohGBBARAgAGBQJDwVhJAAoJEK0m7YKmyAW5enUAoKomp97VmvhcxzFFAWVq\n"
+"nVmgR5o1AJ9pDxHnR987+WpQJEb29fOGRCv9mIhGBBARAgAGBQJDwvoRAAoJEKe9\n"
+"h1GAZnhb3x0AnjPZNWxOxcgCm3pYNqvvoEG4Yn6lAKC25Llg8SZZ2ClPNK5a43Lm\n"
+"QSLm8ohGBBMRAgAGBQJDwqW1AAoJEMPsbb7dbRK9zUIAoMxt11NpDs2I6PWn5rs3\n"
+"kv2ERS/jAJ4lzBh03apWuHGRVTpa7JUwcuRrTIhGBBMRAgAGBQJDwveAAAoJEDlN\n"
+"xZEO1wTqjN8Ani62eTBkOmn48PiGgDxlv0HDKGY+AKCT8dJrDIvWRbioeVoZ2q32\n"
+"ro6nBohGBBMRAgAGBQJECI5aAAoJEMcpqsa+jGsuS4AAnRF5BHE4I5+x6LxpXwqI\n"
+"rJYaJlr6AKCDpSflz+eOARGyMVNZ+tfN7zuYP4hJBBARAgAJBQJEiFlSAgcAAAoJ\n"
+"EJ7/Di3F33VbbR8An2SLqQLhyCrSivMvhkY5y09u/JVyAJ9jLnR/JR/tP0bsaKSz\n"
+"+unF3Tb7YohlBBMRAgAmBQJDwVfSAhsDBQkB3+IABgsJCAcDAgQVAggDBBYCAwEC\n"
+"HgECF4AACgkQw2fYuYHKyoSRdACfcNQ3qoDA0PXABrljF5CctywanhoAmMZ9tbyn\n"
+"LFy4ELbzCCglS8aJrYS5Ag0EQ8FX4xAIAICyMekh4upMZcq/x3krQAQ8bVTzOd1h\n"
+"tcI4UV2voBEapdA7DA/xRpEjNO05o1LM/oq9Rzh8oQtEWf75vNeOLJfiVR1Vy3cz\n"
+"0+a45GR4xFSTHg9zl13OM/oLI5hXrp5O5Zwu6yIZqBRiQNoCifKNvM3nrPhkjszr\n"
+"TNMx2gH84DkoTDGh7th4Iar/t05Q9Ni3HS86LHOAJS4aEimPl/zqM3NyJnZDtlu1\n"
+"dQ0DT13ykHmofrEb4cLNBwER2KfhmR/o9f/ybpPwpUaL3Wo1jJYYEQscBHH0o1Rl\n"
+"OvLKwZrrkwEAuIJRGMWYYtFSecqr/kuSHKc5XQtx/mUnOy+Nrt7ooPcAAwUH+wWM\n"
+"Ce3G4L4dASjTeZlmd8ETUV5Y7iP9GUJrGHek1S5JJeiMKqjfoMVsshBTJlZPkUYq\n"
+"OwnJZzI5lxGD9SbkE2n9LUWGXll3GDbV0zXdzaG5/Efzq5BpISkpqyDszDxb9LPi\n"
+"XQD/EiYP9pqlivgCTIqtcxN0Pdr0ArW0q7/yBfqWe0Fw9JrxHFN8dzmBnZk/sUis\n"
+"ZIxcRWlK/mdfxgcbRSKsaqucToubwJvIONaW3y/zURjG/Ehdkh/NR7yEnMJN6/SY\n"
+"E8VgjwL9Wx1KfC8nuqkFhmSMoIVKOck+0lAU3iTpThyYlU0M1luJvkYT2+Enlc1P\n"
+"eqMK0FlDmF60NbnPuzOITwQYEQIADwUCQ8FX4wIbDAUJAd/iAAAKCRDDZ9i5gcrK\n"
+"hCMLAKDB2xwcJT9OFM6G/seEnVMWGBfzrACg8UyCfxX2mNWNPTE4MQ/xiaQ6VBM=\n"
+"=tVe2\n"
+"-----END PGP PUBLIC KEY BLOCK-----\n"
+#else
+"-----BEGIN PGP PUBLIC KEY BLOCK-----\n"
+"Version: GnuPG v2.0.4 (FreeBSD)\n"
+"\n"
+"mQGiBEWbjf8RBAC+4m2yYYzuA0+D5JQatKmoxG4z3+bat08tMz0YvBUp1UU+95i4\n"
+"cP9ndklv3yzhtZ4MIx5yy64FXtPi0/NQiikEVYPYn2KMO4LCfZCwYBEizVWzABya\n"
+"LZcffCP/3VhoR90NUluWyi+zVAn9KNIRlnhnYpDDlI76fCrTTHDCtgpImwCg7VzB\n"
+"4L6O0JpUJBCZOCAPJNYirUkD/3uCZe4vK4kLW+W3HB+grMCI1uFULmVSKMBQZc+p\n"
+"dqDq++u3zYGqiMNaVrLg/J4GSH/P0ossXEtmTVjLHF4nJ7HXfIjqkqdkxq7g9odY\n"
+"/dkA/aC7z4JBgcYfRnDMqfL12C+3b+KSwxQSzPcbvsFYm2KTgteLwG3mRlpL7Dh5\n"
+"S70nBAC1PkIl7mP4OL7vpQk9dkdQCARJLgyn5pu/pZV7He4fDLHkUr/atnYaIHk1\n"
+"15xl/ziHcBql2WmF0Uff9SuuNOi/hFCuWZSwPKsgtIhYZ5ut4FrBAVkqHV2CgxFp\n"
+"aSiA7+FTG91++LDsg2xrHyTRW+fQnPdpf5a4H1fF15azo40h17QjVmlkZW9MQU4g\n"
+"UmVsZWFzZSBTaWduaW5nIEtleSAoMjAwNymIRgQQEQIABgUCRZ41PgAKCRDDZ9i5\n"
+"gcrKhPmUAJ49Krgt6ZPZZ2YkW7fWFwTvSgGongCePDjnFh1g4078f7lycT4wFk/c\n"
+"vPiIRgQQEQIABgUCRZ71NQAKCRD9Ibw7rD4IebztAKCxuyWCjF2JPAe1hdZqNNbE\n"
+"/gWDRACfaBw6mpHh3+jZuNnRk6NctFMbTzWIRgQTEQIABgUCRZuOiQAKCRDD7G2+\n"
+"3W0SvRkEAJ9cCPrbfzoTHKUVlGLAKbx5pcoutQCdENlo4nwXbQHaREDqm+ISBU3p\n"
+"iXeIZgQTEQIAJgUCRZuN/wIbAwUJAeEzgAYLCQgHAwIEFQIIAwQWAgMBAh4BAheA\n"
+"AAoJEJAoF+SqX03m4ZQAoOSj3JzzUuY+n/oS0Y4/yZ4tThNNAJ4h+9FacWApQdNJ\n"
+"+PcydRFEEm203LkCDQRFm44DEAgAlNLlnyIkLJ/Uyncsd5nB46LqQpJDLJ3AalfN\n"
+"44Vy3aOG+aA7JsNL5T5r5WRGnAf41qSOFiuZHwjfrtKb4TWkcfWlpsi8t5uasII9\n"
+"WAVX2aVIbiPMNWUnhQIn8rjCRLm2t/0Hch0HDbXaI/hvub5qhmSHfmqzlkuEUyVu\n"
+"H+beivX8pQwxqpcWXrmwuNzhISR1DsWBn5u0WcOSqUDtFG5Me8AuPFR1oxdYTtvC\n"
+"vqlVnw6ag3QuNqaAgWDU5Ug/U10ZxCZTn5TAcp+1ZDlM/dXIwh8wKXDjiKqHgYg1\n"
+"VLQ4fOsscTJoUDOaobeaVwTcDaSB4yQ3bhB2q5fLKqj+bNrY9wADBQf/Rw92M9b/\n"
+"JRs5IpX3fcrgHetVLHPiRuW8btD6EkmlgyRFOwOCzOSlSzFW6DKFrbOvd01EWkaP\n"
+"4PWJNW7b7OZqzK+UWzlWTgtV/2iUJtHg3+euZRdc5V9gqW17+HIAxjJVE53Syn8u\n"
+"kiJpk7HebtQo/v/pk3jtxdeJU3fY8ZAKJFl8V9aAj7ATFaAhYohzyKTRYc04F0n6\n"
+"VJDtwQkobdhq2//+5hSVrJ9wXRRF6XFVxc32NinqDEYrJUvTVayYu28Ivg4CTlts\n"
+"a+R7x92aDVT2KT+voPIGZxPYjALGa/I2hrlEYD9CiRFNBKAzRiNGAOo67SNI4hDu\n"
+"rFWRmMNOONWpIIhPBBgRAgAPBQJFm44DAhsMBQkB4TOAAAoJEJAoF+SqX03m57kA\n"
+"oMPb2o2D9gSwQFKXhamx2YdrykHOAKDqQ1tHH3ULY5cLLAKVaQtsNhVEtQ==\n"
+"=qrc1\n"
+"-----END PGP PUBLIC KEY BLOCK-----\n"
+#endif
+};
+
enum
{
UpdateReleaseStatusOlder,
struct update_release_t release; ///< Release (version)
};
-
#define update_New( a ) __update_New( VLC_OBJECT( a ) )
VLC_EXPORT( update_t *, __update_New, ( vlc_object_t * ) );
*/
#endif
+
+#endif
* This file contains functions related to VLC and plugins update management
*/
+/*
+ * TODO: * pgp verification of the update file
+ * binary download, and pgp verification
+ */
+
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <vlc/vlc.h>
+#ifdef UPDATE_CHECK
+
#include <ctype.h> /* tolower() */
#include <assert.h>
static int CompareReleases( const struct update_release_t *p1,
const struct update_release_t *p2 );
+/*****************************************************************************
+ * OpenPGP functions
+ *****************************************************************************/
+
+#define packet_type( c ) ( ( c & 0x3c ) >> 2 ) /* 0x3C = 00111100 */
+#define packet_header_len( c ) ( ( c & 0x03 ) + 1 ) /* number of bytes in a packet header */
+
+static inline int scalar_number( uint8_t *p, int header_len )
+{
+ if( header_len == 1 )
+ return( p[0] );
+ else if( header_len == 2 )
+ return( (p[0] << 8) + p[1] );
+ else if( header_len == 4 )
+ return( (p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3] );
+ else
+ abort();
+}
+
+/* number of data bytes in a MPI */
+#define mpi_len( mpi ) ( ( scalar_number( mpi, 2 ) + 7 ) / 8 )
+
+/*
+ * fill a public_key_packet_t structure from public key packet data
+ * verify that it is a version 4 public key packet, using DSA
+ */
+static int parse_public_key_packet( public_key_packet_t *p_key, uint8_t *p_buf,
+ size_t i_packet_len )
+{
+ if( i_packet_len != 418 )
+ return VLC_EGENERIC;
+
+ p_key->version = *p_buf++;
+ if( p_key->version != 4 )
+ return VLC_EGENERIC;
+
+ /* warn when timestamp is > date ? */
+ memcpy( p_key->timestamp, p_buf, 4 ); p_buf += 4;
+
+ p_key->algo = *p_buf++;
+ if( p_key->algo != PUBLIC_KEY_ALGO_DSA )
+ return VLC_EGENERIC;
+
+ memcpy( p_key->p, p_buf, 2+128 ); p_buf += 2+128;
+ if( mpi_len( p_key->p ) != 128 )
+ return VLC_EGENERIC;
+
+ memcpy( p_key->q, p_buf, 2+20 ); p_buf += 2+20;
+ if( mpi_len( p_key->q ) != 20 )
+ return VLC_EGENERIC;
+
+ memcpy( p_key->g, p_buf, 2+128 ); p_buf += 2+128;
+ if( mpi_len( p_key->g ) != 128 )
+ return VLC_EGENERIC;
+
+ memcpy( p_key->y, p_buf, 2+128 ); p_buf += 2+128;
+ if( mpi_len( p_key->y ) != 128 )
+ return VLC_EGENERIC;
+
+ return VLC_SUCCESS;
+}
+
+/*
+ * fill a signature_packet_v4_t from signature packet data
+ * verify that it was used with a DSA public key, using SHA-1 digest
+ */
+static int parse_signature_v4_packet( signature_packet_v4_t *p_sig,
+ uint8_t *p_buf, size_t i_sig_len )
+{
+ if( i_sig_len < 54 )
+ return VLC_EGENERIC;
+
+ p_sig->version = *p_buf++;
+ if( p_sig->version != 4 )
+ return VLC_EGENERIC;
+
+ p_sig->type = *p_buf++;
+ if( p_sig->type < GENERIC_KEY_SIGNATURE ||
+ p_sig->type > POSITIVE_KEY_SIGNATURE )
+ return VLC_EGENERIC;
+
+ p_sig->public_key_algo = *p_buf++;
+ if( p_sig->public_key_algo != PUBLIC_KEY_ALGO_DSA )
+ return VLC_EGENERIC;
+
+ p_sig->digest_algo = *p_buf++;
+ if( p_sig->digest_algo != DIGEST_ALGO_SHA1 )
+ return VLC_EGENERIC;
+
+ memcpy( p_sig->hashed_data_len, p_buf, 2 ); p_buf += 2;
+
+ size_t i_pos = 6;
+ size_t i_hashed_data_len = scalar_number( p_sig->hashed_data_len, 2 );
+ i_pos += i_hashed_data_len;
+ if( i_pos > i_sig_len - 48 ) /* r & s are 44 bytes in total,
+ * + the unhashed data length (2 bytes)
+ * + the hash verification (2 bytes) */
+ return VLC_EGENERIC;
+
+ p_sig->hashed_data = (uint8_t*) malloc( i_hashed_data_len );
+ if( !p_sig->hashed_data )
+ return VLC_ENOMEM;
+ memcpy( p_sig->hashed_data, p_buf, i_hashed_data_len );
+ p_buf += i_hashed_data_len;
+
+ memcpy( p_sig->unhashed_data_len, p_buf, 2 ); p_buf += 2;
+
+ size_t i_unhashed_data_len = scalar_number( p_sig->unhashed_data_len, 2 );
+ i_pos += 2 + i_unhashed_data_len;
+ if( i_pos != i_sig_len - 46 )
+ {
+ free( p_sig->hashed_data );
+ return VLC_EGENERIC;
+ }
+
+ p_sig->unhashed_data = (uint8_t*) malloc( i_unhashed_data_len );
+ if( !p_sig->unhashed_data )
+ {
+ free( p_sig->hashed_data );
+ return VLC_ENOMEM;
+ }
+ memcpy( p_sig->unhashed_data, p_buf, i_unhashed_data_len );
+ p_buf += i_unhashed_data_len;
+
+ memcpy( p_sig->hash_verification, p_buf, 2 ); p_buf += 2;
+
+ memcpy( p_sig->r, p_buf, 22 ); p_buf += 22;
+ if( mpi_len( p_sig->r ) != 20 )
+ {
+ free( p_sig->hashed_data );
+ free( p_sig->unhashed_data );
+ return VLC_EGENERIC;
+ }
+
+ memcpy( p_sig->s, p_buf, 22 );
+ if( mpi_len( p_sig->s ) != 20 )
+ {
+ free( p_sig->hashed_data );
+ free( p_sig->unhashed_data );
+ return VLC_EGENERIC;
+ }
+
+ return VLC_SUCCESS;
+}
+
+/*
+ * crc_octets() was lamely copied from rfc 2440
+ * Copyright (C) The Internet Society (1998). All Rights Reserved.
+ */
+#define CRC24_INIT 0xB704CEL
+#define CRC24_POLY 0x1864CFBL
+
+static long crc_octets( uint8_t *octets, size_t len )
+{
+ long crc = CRC24_INIT;
+ int i;
+ while (len--)
+ {
+ crc ^= (*octets++) << 16;
+ for (i = 0; i < 8; i++)
+ {
+ crc <<= 1;
+ if (crc & 0x1000000)
+ crc ^= CRC24_POLY;
+ }
+ }
+ return crc & 0xFFFFFFL;
+}
+
+/*
+ * Transform an armored document in binary format
+ * Used on public keys and signatures
+ */
+static int pgp_unarmor( char *p_ibuf, size_t i_ibuf_len,
+ uint8_t *p_obuf, size_t i_obuf_len )
+{
+ char *p_ipos = p_ibuf;
+ uint8_t *p_opos = p_obuf;
+ int i_end = 0;
+
+ int i_header_skipped = 0;
+
+ while( !i_end && p_ipos < p_ibuf + i_ibuf_len )
+ {
+ if( *p_ipos == '\r' || *p_ipos == '\n' )
+ {
+ p_ipos++;
+ continue;
+ }
+
+ size_t i_line_len = strcspn( p_ipos, "\r\n" );
+ if( i_line_len == 0 )
+ continue;
+
+ if( !i_header_skipped )
+ {
+ if( !strncmp( p_ipos, "-----BEGIN PGP", 14 ) )
+ i_header_skipped = 1;
+
+ p_ipos += i_line_len + 1;
+ continue;
+ }
+
+ if( !strncmp( p_ipos, "Version:", 8 ) )
+ {
+ p_ipos += i_line_len + 1;
+ continue;
+ }
+
+ if( p_ipos[i_line_len - 1] == '=' )
+ {
+ i_end = 1;
+ p_ipos[i_line_len - 1] = '\0';
+ }
+ else
+ p_ipos[i_line_len] = '\0';
+
+ p_opos += vlc_b64_decode_binary_to_buffer( p_opos,
+ p_obuf - p_opos + i_obuf_len,
+ p_ipos );
+
+ p_ipos += i_line_len + 1;
+ }
+
+ /* XXX: the CRC is OPTIONAL, really require it ? */
+ if( p_ipos + 5 > p_ibuf + i_ibuf_len || *p_ipos++ != '=' )
+ return 0;
+
+ uint8_t p_crc[3];
+ if( vlc_b64_decode_binary_to_buffer( p_crc, 3, p_ipos ) != 3 )
+ return 0;
+
+ long l_crc = crc_octets( p_obuf, p_opos - p_obuf );
+ long l_crc2 = ( 0 << 24 ) + ( p_crc[0] << 16 ) + ( p_crc[1] << 8 ) + p_crc[2];
+
+ return l_crc2 == l_crc ? p_opos - p_obuf : 0;
+}
+
+/*
+ * Download the signature associated to a document or a binary file.
+ * We're given the file's url, we just append ".asc" to it and download
+ */
+static int download_signature( vlc_object_t *p_this,
+ signature_packet_v3_t *p_sig, char *psz_url )
+{
+ char *psz_sig = (char*) malloc( strlen( psz_url ) + 4 + 1 ); /* ".asc" + \0 */
+ if( !psz_sig )
+ return VLC_ENOMEM;
+
+ strcpy( psz_sig, psz_url );
+ strcat( psz_sig, ".asc" );
+
+ stream_t *p_stream = stream_UrlNew( p_this, psz_sig );
+ free( psz_sig );
+
+ if( !p_stream )
+ return VLC_ENOMEM;
+
+ int64_t i_size = stream_Size( p_stream );
+ if( i_size < 65 )
+ {
+ stream_Delete( p_stream );
+ return VLC_EGENERIC;
+ }
+ else if( i_size == 65 ) /* binary format signature */
+ {
+ int i_read = stream_Read( p_stream, p_sig, (int)i_size );
+ stream_Delete( p_stream );
+ if( i_read != i_size )
+ return VLC_EGENERIC;
+ else
+ return VLC_SUCCESS;
+ }
+
+ char *p_buf = (char*)malloc( i_size );
+ if( !p_buf )
+ {
+ stream_Delete( p_stream );
+ return VLC_ENOMEM;
+ }
+
+ int i_read = stream_Read( p_stream, p_buf, (int)i_size );
+
+ stream_Delete( p_stream );
+
+ if( i_read != i_size )
+ {
+ free( p_buf );
+ return VLC_EGENERIC;
+ }
+
+ int i_bytes = pgp_unarmor( p_buf, i_size, (uint8_t*)p_sig, 65 );
+ free( p_buf );
+
+ if( i_bytes != 65 )
+ return VLC_EGENERIC;
+ else
+ return VLC_SUCCESS;
+}
+
+/*
+ * Verify an OpenPGP signature made on some SHA-1 hash, with some DSA public key
+ */
+static int verify_signature( vlc_object_t *p_this, uint8_t *p_r, uint8_t *p_s,
+ public_key_packet_t *p_key, uint8_t *p_hash )
+{
+ /* the data to be verified (a SHA-1 hash) */
+ const char *hash_sexp_s = "(data(flags raw)(value %m))";
+ /* the public key */
+ const char *key_sexp_s = "(public-key(dsa(p %m)(q %m)(g %m)(y %m)))";
+ /* the signature */
+ const char *sig_sexp_s = "(sig-val(dsa(r %m )(s %m )))";
+
+ size_t erroff;
+ gcry_mpi_t p, q, g, y, r, s, hash;
+ p = q = g = y = r = s = hash = NULL;
+ gcry_sexp_t key_sexp, hash_sexp, sig_sexp;
+ key_sexp = hash_sexp = sig_sexp = NULL;
+
+ if( gcry_mpi_scan( &p, GCRYMPI_FMT_USG, p_key->p + 2, 128, NULL ) ||
+ gcry_mpi_scan( &q, GCRYMPI_FMT_USG, p_key->q + 2, 20, NULL ) ||
+ gcry_mpi_scan( &g, GCRYMPI_FMT_USG, p_key->g + 2, 128, NULL ) ||
+ gcry_mpi_scan( &y, GCRYMPI_FMT_USG, p_key->y + 2, 128, NULL ) ||
+ gcry_sexp_build( &key_sexp, &erroff, key_sexp_s, p, q, g, y ) )
+ goto problem;
+
+ if( gcry_mpi_scan( &r, GCRYMPI_FMT_USG, p_r + 2, 20, NULL ) ||
+ gcry_mpi_scan( &s, GCRYMPI_FMT_USG, p_s + 2, 20, NULL ) ||
+ gcry_sexp_build( &sig_sexp, &erroff, sig_sexp_s, r, s ) )
+ goto problem;
+
+ if( gcry_mpi_scan( &hash, GCRYMPI_FMT_USG, p_hash, 20, NULL ) ||
+ gcry_sexp_build( &hash_sexp, &erroff, hash_sexp_s, hash ) )
+ goto problem;
+
+ if( gcry_pk_verify( sig_sexp, hash_sexp, key_sexp ) )
+ goto problem;
+
+ return VLC_SUCCESS;
+
+problem:
+ if( p ) gcry_mpi_release( p );
+ if( q ) gcry_mpi_release( q );
+ if( g ) gcry_mpi_release( g );
+ if( y ) gcry_mpi_release( y );
+ if( r ) gcry_mpi_release( r );
+ if( s ) gcry_mpi_release( s );
+ if( hash ) gcry_mpi_release( hash );
+ if( key_sexp ) gcry_sexp_release( key_sexp );
+ if( sig_sexp ) gcry_sexp_release( sig_sexp );
+ if( hash_sexp ) gcry_sexp_release( hash_sexp );
+ return VLC_EGENERIC;
+}
+
+/*
+ * Return the long id (8 bytes) of the public key used to generate a signature
+ */
+static uint8_t *get_issuer_from_signature_v4( signature_packet_v4_t *p_sig )
+{
+ uint8_t *p = p_sig->unhashed_data;
+ uint8_t *max_pos = p + scalar_number( p_sig->unhashed_data_len, 2 );
+
+ while( p < max_pos )
+ {
+ int i_subpacket_len = *p < 192 ? *p++ :
+ *p < 255 ? ((*p++ - 192) << 8) + *p++ + 192 :
+ ((*++p) << 24) + (*++p << 16) + (*++p << 8) + *++p;
+
+ if( p >= max_pos - 1 )
+ return NULL;
+
+ if( *p == ISSUER_SUBPACKET )
+ return p+1;
+ else
+ p += i_subpacket_len;
+ }
+ return NULL;
+}
+
+/*
+ * fill a public_key_t with public key data, including:
+ * * public key packet
+ * * signature packet issued by key which long id is p_sig_issuer
+ * * user id packet
+ */
+static int parse_public_key( const uint8_t *p_key_data, size_t i_key_len, public_key_t *p_key, const uint8_t *p_sig_issuer )
+{
+ uint8_t *pos = (uint8_t*) p_key_data;
+ uint8_t *max_pos = pos + i_key_len;
+
+ int i_status = 0;
+#define PUBLIC_KEY_FOUND 0x01
+#define USER_ID_FOUND 0x02
+#define SIGNATURE_FOUND 0X04
+
+ uint8_t *p_key_unarmored = NULL;
+
+ signature_packet_v4_t sig;
+
+ p_key->psz_username = NULL;
+ p_key->sig.hashed_data = p_key->sig.unhashed_data = NULL;
+
+ if( !( *pos & 0x80 ) )
+ { /* first byte is ASCII, unarmoring */
+ p_key_unarmored = (uint8_t*)malloc( i_key_len );
+ if( !p_key_unarmored )
+ return VLC_ENOMEM;
+ int i_len = pgp_unarmor( (char*)p_key_data, i_key_len,
+ p_key_unarmored, i_key_len );
+
+ if( i_len == 0 )
+ goto error;
+
+ pos = p_key_unarmored;
+ max_pos = pos + i_len;
+ }
+
+ while( pos < max_pos )
+ {
+ if( !(*pos & 0x80) || *pos & 0x40 )
+ goto error;
+
+ int i_type = packet_type( *pos );
+
+ int i_header_len = packet_header_len( *pos++ );
+ if( pos + i_header_len > max_pos )
+ goto error;
+
+ int i_packet_len = scalar_number( pos, i_header_len );
+ pos += i_header_len;
+
+ if( pos + i_packet_len > max_pos )
+ goto error;
+
+ switch( i_type )
+ {
+ uint8_t *p_issuer;
+
+ case PUBLIC_KEY_PACKET:
+ i_status |= PUBLIC_KEY_FOUND;
+ if( parse_public_key_packet( &p_key->key, pos, i_packet_len ) != VLC_SUCCESS )
+ goto error;
+ break;
+
+ case SIGNATURE_PACKET:
+ if( !p_sig_issuer || i_status & SIGNATURE_FOUND ||
+ parse_signature_v4_packet( &sig, pos, i_packet_len ) != VLC_SUCCESS )
+ break;
+ p_issuer = get_issuer_from_signature_v4( &sig );
+ if( memcmp( p_issuer, p_sig_issuer, 8 ) == 0 )
+ {
+ memcpy( &p_key->sig, &sig, sizeof( signature_packet_v4_t ) );
+ i_status |= SIGNATURE_FOUND;
+ }
+ else
+ {
+ free( sig.hashed_data );
+ free( sig.unhashed_data );
+ }
+ break;
+
+ case USER_ID_PACKET:
+ if( p_key->psz_username ) /* save only the first User ID */
+ break;
+ i_status |= USER_ID_FOUND;
+ p_key->psz_username = (uint8_t*)malloc( i_packet_len + 1);
+ if( !p_key->psz_username )
+ goto error;
+
+ memcpy( p_key->psz_username, pos, i_packet_len );
+ p_key->psz_username[i_packet_len] = '\0';
+ break;
+
+ default:
+ break;
+ }
+ pos += i_packet_len;
+ }
+ free( p_key_unarmored );
+
+ if( !( i_status & ( PUBLIC_KEY_FOUND + USER_ID_FOUND ) ) )
+ return VLC_EGENERIC;
+
+ if( p_sig_issuer && !( i_status & SIGNATURE_FOUND ) )
+ return VLC_EGENERIC;
+
+ return VLC_SUCCESS;
+
+error:
+ free( p_key->sig.hashed_data );
+ free( p_key->sig.unhashed_data );
+ free( p_key->psz_username );
+ free( p_key_unarmored );
+ return VLC_EGENERIC;
+}
+
+/*
+ * return a sha1 hash of a file
+ */
+static uint8_t *hash_sha1_from_file( const char *psz_file,
+ signature_packet_v3_t *p_sig )
+{
+ FILE *f = utf8_fopen( psz_file, "r" );
+ if( !f )
+ return NULL;
+
+ uint8_t buffer[4096]; //FIXME
+
+ gcry_md_hd_t hd;
+ if( gcry_md_open( &hd, GCRY_MD_SHA1, 0 ) )
+ {
+ fclose( f );
+ return NULL;
+ }
+
+ size_t i_read;
+ while( ( i_read = fread( buffer, 1, sizeof(buffer), f ) ) > 0 )
+ gcry_md_write( hd, buffer, i_read );
+
+ gcry_md_putc( hd, p_sig->type );
+ gcry_md_write( hd, &p_sig->timestamp, 4 );
+
+ fclose( f );
+ gcry_md_final( hd );
+
+ return( (uint8_t*) gcry_md_read( hd, GCRY_MD_SHA1) );
+}
+
+/*
+ * download a public key (the last one) from videolan server, and parse it
+ */
+static public_key_t *download_key( vlc_object_t *p_this, const uint8_t *p_longid, const uint8_t *p_signature_issuer )
+{
+ char *psz_url;
+ if( asprintf( &psz_url, "http://download.videolan.org/pub/keys/%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x.asc",
+ p_longid[0], p_longid[1],
+ p_longid[2], p_longid[3],
+ p_longid[4], p_longid[5],
+ p_longid[6], p_longid[7] ) == -1 )
+ return NULL;
+
+ stream_t *p_stream = stream_UrlNew( p_this, psz_url );
+ free( psz_url );
+ if( !p_stream )
+ return NULL;
+
+ int64_t i_size = stream_Size( p_stream );
+ if( i_size < 0 )
+ {
+ stream_Delete( p_stream );
+ return NULL;
+ }
+
+ uint8_t *p_buf = (uint8_t*)malloc( i_size );
+ if( !p_buf )
+ {
+ stream_Delete( p_stream );
+ return NULL;
+ }
+
+ int i_read = stream_Read( p_stream, p_buf, (int)i_size );
+ stream_Delete( p_stream );
+
+ if( i_read != (int)i_size )
+ {
+ free( p_buf );
+ return NULL;
+ }
+
+ public_key_t *p_pkey = (public_key_t*) malloc( sizeof( public_key_t ) );
+ if( !p_pkey )
+ {
+ free( p_buf );
+ return NULL;
+ }
+
+ int i_error = parse_public_key( p_buf, i_read, p_pkey, p_signature_issuer );
+ free( p_buf );
+
+ if( i_error != VLC_SUCCESS )
+ {
+ free( p_pkey );
+ return NULL;
+ }
+
+ return p_pkey;
+}
+
+/*
+ * Generate a SHA-1 hash on a public key, to verify a signature made on that hash
+ * Note that we need the signature to compute the hash
+ */
+static uint8_t *key_sign_hash( public_key_t *p_pkey )
+{
+ gcry_error_t error = 0;
+ gcry_md_hd_t hd;
+
+ error = gcry_md_open( &hd, GCRY_MD_SHA1, 0 );
+ if( error )
+ return NULL;
+
+ gcry_md_putc( hd, 0x99 );
+
+ gcry_md_putc( hd, (418 >> 8) & 0xff );
+ gcry_md_putc( hd, 418 & 0xff );
+
+ gcry_md_write( hd, (uint8_t*)&p_pkey->key, 418 );
+
+ gcry_md_putc( hd, 0xb4 );
+
+ int i_len = strlen((char*)p_pkey->psz_username);
+
+ gcry_md_putc( hd, (i_len << 24) & 0xff );
+ gcry_md_putc( hd, (i_len << 16) & 0xff );
+ gcry_md_putc( hd, (i_len << 8) & 0xff );
+ gcry_md_putc( hd, (i_len) & 0xff );
+
+ gcry_md_write( hd, p_pkey->psz_username, i_len );
+
+ size_t i_hashed_data_len = scalar_number( p_pkey->sig.hashed_data_len, 2 );
+
+ gcry_md_putc( hd, p_pkey->sig.version );
+ gcry_md_putc( hd, p_pkey->sig.type );
+ gcry_md_putc( hd, p_pkey->sig.public_key_algo );
+ gcry_md_putc( hd, p_pkey->sig.digest_algo );
+ gcry_md_write( hd, p_pkey->sig.hashed_data_len, 2 );
+ gcry_md_write( hd, p_pkey->sig.hashed_data, i_hashed_data_len );
+
+ gcry_md_putc( hd, 0x04 );
+ gcry_md_putc( hd, 0xff );
+
+ i_hashed_data_len += 6; /* hashed data + 6 bytes header */
+
+ gcry_md_putc( hd, (i_hashed_data_len << 24) & 0xff);
+ gcry_md_putc( hd, (i_hashed_data_len << 16) &0xff );
+ gcry_md_putc( hd, (i_hashed_data_len << 8) & 0xff );
+ gcry_md_putc( hd, (i_hashed_data_len) & 0xff );
+
+ gcry_md_final( hd );
+
+ uint8_t *p_hash = gcry_md_read( hd, GCRY_MD_SHA1);
+
+ if( p_hash[0] != p_pkey->sig.hash_verification[0] ||
+ p_hash[1] != p_pkey->sig.hash_verification[1] )
+ {
+ free( p_hash );
+ return NULL;
+ }
+
+ return p_hash;
+}
+
/*****************************************************************************
* Update_t functions
}
return i_result;
}
+
+#endif
projects / vlc / commitdiff