From c309115820402fda6e08b2999f9dc738e3f4bc4d Mon Sep 17 00:00:00 2001 From: Johan Danielsson Date: Mon, 23 Mar 1998 22:45:35 +0000 Subject: [PATCH] Implement `gssapi_krb5_verify_8003_checksum'. git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@4654 ec53bebd-3082-4978-b11e-865c3cabbd6b --- lib/gssapi/8003.c | 43 +++++++++++++++++++++++++++++++++++++++++- lib/gssapi/krb5/8003.c | 43 +++++++++++++++++++++++++++++++++++++++++- 2 files changed, 84 insertions(+), 2 deletions(-) diff --git a/lib/gssapi/8003.c b/lib/gssapi/8003.c index fbf632c49..dc1bbac0d 100644 --- a/lib/gssapi/8003.c +++ b/lib/gssapi/8003.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 1997 Kungliga Tekniska Högskolan + * Copyright (c) 1997, 1998 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * @@ -50,6 +50,13 @@ encode_om_uint32(OM_uint32 n, u_char *p) return 0; } +static krb5_error_code +decode_om_uint32(u_char *p, OM_uint32 *n) +{ + *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); + return 0; +} + static krb5_error_code hash_input_chan_bindings (const gss_channel_bindings_t b, u_char *p) @@ -114,3 +121,37 @@ gssapi_krb5_create_8003_checksum ( return 0; } +krb5_error_code +gssapi_krb5_verify_8003_checksum( + const gss_channel_bindings_t input_chan_bindings, + Checksum *cksum, + OM_uint32 *flags) +{ + unsigned char hash[16]; + unsigned char *p; + OM_uint32 length; + + /* XXX should handle checksums > 24 bytes */ + if(cksum->cksumtype != 0x8003 || cksum->checksum.length != 24) + return GSS_S_BAD_BINDINGS; + + p = cksum->checksum.data; + decode_om_uint32(p, &length); + if(length != sizeof(hash)) + return GSS_S_FAILURE; + + p += 4; + + if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS) { + if(hash_input_chan_bindings(input_chan_bindings, hash) != 0) + return GSS_S_FAILURE; + if(memcmp(hash, p, sizeof(hash)) != 0) + return GSS_S_FAILURE; + } + + p += sizeof(hash); + + decode_om_uint32(p, flags); + + return 0; +} diff --git a/lib/gssapi/krb5/8003.c b/lib/gssapi/krb5/8003.c index fbf632c49..dc1bbac0d 100644 --- a/lib/gssapi/krb5/8003.c +++ b/lib/gssapi/krb5/8003.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 1997 Kungliga Tekniska Högskolan + * Copyright (c) 1997, 1998 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * @@ -50,6 +50,13 @@ encode_om_uint32(OM_uint32 n, u_char *p) return 0; } +static krb5_error_code +decode_om_uint32(u_char *p, OM_uint32 *n) +{ + *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); + return 0; +} + static krb5_error_code hash_input_chan_bindings (const gss_channel_bindings_t b, u_char *p) @@ -114,3 +121,37 @@ gssapi_krb5_create_8003_checksum ( return 0; } +krb5_error_code +gssapi_krb5_verify_8003_checksum( + const gss_channel_bindings_t input_chan_bindings, + Checksum *cksum, + OM_uint32 *flags) +{ + unsigned char hash[16]; + unsigned char *p; + OM_uint32 length; + + /* XXX should handle checksums > 24 bytes */ + if(cksum->cksumtype != 0x8003 || cksum->checksum.length != 24) + return GSS_S_BAD_BINDINGS; + + p = cksum->checksum.data; + decode_om_uint32(p, &length); + if(length != sizeof(hash)) + return GSS_S_FAILURE; + + p += 4; + + if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS) { + if(hash_input_chan_bindings(input_chan_bindings, hash) != 0) + return GSS_S_FAILURE; + if(memcmp(hash, p, sizeof(hash)) != 0) + return GSS_S_FAILURE; + } + + p += sizeof(hash); + + decode_om_uint32(p, flags); + + return 0; +}