From 57d3cd115972a25a616e7c37e1b0477e85735a18 Mon Sep 17 00:00:00 2001 From: Aaron Jones Date: Wed, 4 May 2016 09:09:01 +0000 Subject: [PATCH] [mbedtls] Fix up backend to allow fingerprint generation See the comments in the newly created file for an explanation. --- libratbox/src/mbedtls.c | 24 ++++-- libratbox/src/mbedtls_embedded_data.h | 107 ++++++++++++++++++++++++++ 2 files changed, 123 insertions(+), 8 deletions(-) create mode 100644 libratbox/src/mbedtls_embedded_data.h diff --git a/libratbox/src/mbedtls.c b/libratbox/src/mbedtls.c index 28e0767f..26e6e780 100644 --- a/libratbox/src/mbedtls.c +++ b/libratbox/src/mbedtls.c @@ -43,6 +43,8 @@ #include "mbedtls/dhm.h" #include "mbedtls/version.h" +#include "mbedtls_embedded_data.h" + typedef struct { mbedtls_x509_crt crt; @@ -62,11 +64,10 @@ typedef struct #define SSL_C(x) ((rb_mbedtls_ssl_context *) (x)->ssl)->cfg #define SSL_P(x) &((rb_mbedtls_ssl_context *) (x)->ssl)->ssl -static const char librb_personal_str[] = "charybdis/librb personalization string"; - static mbedtls_ctr_drbg_context ctr_drbg_ctx; static mbedtls_entropy_context entropy_ctx; +static mbedtls_x509_crt dummy_ca_ctx; static rb_mbedtls_cfg_context *rb_mbedtls_cfg = NULL; static const char * @@ -156,6 +157,10 @@ static rb_mbedtls_cfg_context *rb_mbedtls_cfg_new(void) mbedtls_ssl_conf_rng(&cfg->server_cfg, mbedtls_ctr_drbg_random, &ctr_drbg_ctx); mbedtls_ssl_conf_rng(&cfg->client_cfg, mbedtls_ctr_drbg_random, &ctr_drbg_ctx); + mbedtls_ssl_conf_ca_chain(&cfg->server_cfg, &dummy_ca_ctx, NULL); + mbedtls_ssl_conf_ca_chain(&cfg->client_cfg, &dummy_ca_ctx, NULL); + + mbedtls_ssl_conf_authmode(&cfg->server_cfg, MBEDTLS_SSL_VERIFY_OPTIONAL); mbedtls_ssl_conf_authmode(&cfg->client_cfg, MBEDTLS_SSL_VERIFY_NONE); return cfg; @@ -410,13 +415,21 @@ rb_init_ssl(void) mbedtls_entropy_init(&entropy_ctx); if((ret = mbedtls_ctr_drbg_seed(&ctr_drbg_ctx, mbedtls_entropy_func, &entropy_ctx, - (const unsigned char *)librb_personal_str, sizeof(librb_personal_str))) != 0) + (const unsigned char *)rb_mbedtls_personal_str, sizeof(rb_mbedtls_personal_str))) != 0) { rb_lib_log("rb_init_ssl: ctr_drbg_seed: %s", rb_get_ssl_strerror_internal(ret)); return 0; } + if((ret = mbedtls_x509_crt_parse_der(&dummy_ca_ctx, rb_mbedtls_dummy_ca_certificate, + sizeof(rb_mbedtls_dummy_ca_certificate))) != 0) + { + rb_lib_log("rb_init_ssl: x509_crt_parse_der (Dummy CA): %s", + rb_get_ssl_strerror_internal(ret)); + return 0; + } + return 1; } @@ -491,11 +504,6 @@ rb_setup_ssl_server(const char *certfile, const char *keyfile, const char *dhfil rb_mbedtls_cfg_decref(newcfg); return 0; } - if(newcfg->crt.next) - { - mbedtls_ssl_conf_ca_chain(&newcfg->server_cfg, newcfg->crt.next, NULL); - mbedtls_ssl_conf_ca_chain(&newcfg->client_cfg, newcfg->crt.next, NULL); - } /* XXX support cipher lists when added to mbedtls */ diff --git a/libratbox/src/mbedtls_embedded_data.h b/libratbox/src/mbedtls_embedded_data.h new file mode 100644 index 00000000..83782089 --- /dev/null +++ b/libratbox/src/mbedtls_embedded_data.h @@ -0,0 +1,107 @@ +/* + * libratbox: a library used by ircd-ratbox and other things + * mbedtls.h: embedded data for ARM mbedTLS backend + * + * Copyright (C) 2016 Aaron Jones + * + * 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 + * + * $Id$ + */ + +#ifndef RB_MBEDTLS_EMBEDDED_DATA_H +#define RB_MBEDTLS_EMBEDDED_DATA_H + +/* + * Personalization string for CTR-DRBG initialization + */ +static const char rb_mbedtls_personal_str[] = "charybdis/librb personalization string"; + +/* + * YES, this is a hardcoded CA certificate. + * + * BEFORE YOU THROW YOUR ARMS UP IN A PANIC ABOUT A BACKDOOR, READ THIS TEXT! + * + * ARM mbedTLS requires a CA certificate to be set in its configuration before it will + * request a client certificate from peers. Since we want to do that, and not all + * installations will have a CA certificate to hand, we have this. + * + * Its key was securely destroyed after being generated, but even if it wasn't, that + * doesn't matter; the IRCd will accept ALL certificates, whether signed by this CA + * certificate or not! + * + * After all, it only cares about certificates in as far as to generate a fingerprint + * for them. + * + * Yes, this is a massive hack, but there is no alternative. + */ + +static const unsigned char rb_mbedtls_dummy_ca_certificate[825] = { + 0x30, 0x82, 0x03, 0x35, 0x30, 0x82, 0x02, 0x1D, 0xA0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x09, 0x00, + 0x86, 0xC5, 0x1F, 0x62, 0xBE, 0xFC, 0x0B, 0xA8, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, + 0xF7, 0x0D, 0x01, 0x01, 0x0B, 0x05, 0x00, 0x30, 0x31, 0x31, 0x2F, 0x30, 0x2D, 0x06, 0x03, 0x55, + 0x04, 0x03, 0x0C, 0x26, 0x43, 0x68, 0x61, 0x72, 0x79, 0x62, 0x64, 0x69, 0x73, 0x20, 0x6D, 0x62, + 0x65, 0x64, 0x54, 0x4C, 0x53, 0x20, 0x44, 0x75, 0x6D, 0x6D, 0x79, 0x20, 0x43, 0x41, 0x20, 0x43, + 0x65, 0x72, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x65, 0x30, 0x1E, 0x17, 0x0D, 0x31, 0x36, + 0x30, 0x35, 0x30, 0x34, 0x30, 0x38, 0x35, 0x32, 0x35, 0x33, 0x5A, 0x17, 0x0D, 0x34, 0x33, 0x30, + 0x39, 0x32, 0x30, 0x30, 0x38, 0x35, 0x32, 0x35, 0x33, 0x5A, 0x30, 0x31, 0x31, 0x2F, 0x30, 0x2D, + 0x06, 0x03, 0x55, 0x04, 0x03, 0x0C, 0x26, 0x43, 0x68, 0x61, 0x72, 0x79, 0x62, 0x64, 0x69, 0x73, + 0x20, 0x6D, 0x62, 0x65, 0x64, 0x54, 0x4C, 0x53, 0x20, 0x44, 0x75, 0x6D, 0x6D, 0x79, 0x20, 0x43, + 0x41, 0x20, 0x43, 0x65, 0x72, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x65, 0x30, 0x82, 0x01, + 0x22, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00, + 0x03, 0x82, 0x01, 0x0F, 0x00, 0x30, 0x82, 0x01, 0x0A, 0x02, 0x82, 0x01, 0x01, 0x00, 0xCA, 0x4B, + 0xA6, 0xA1, 0x82, 0x5B, 0x06, 0xC6, 0x82, 0x76, 0x8E, 0xB2, 0x22, 0x37, 0x83, 0x91, 0x4B, 0xD0, + 0xAE, 0x2F, 0xEE, 0x8E, 0x60, 0x04, 0xBA, 0x77, 0x8C, 0xD0, 0xCF, 0x5E, 0xA4, 0xFD, 0x80, 0xA1, + 0x2E, 0xDC, 0x1F, 0xD9, 0x72, 0x2C, 0x28, 0x03, 0x27, 0x48, 0x23, 0x6E, 0x41, 0x49, 0x62, 0x09, + 0x2D, 0xCF, 0x87, 0xA1, 0x45, 0x9D, 0x2B, 0x43, 0x6F, 0xBB, 0xDB, 0x23, 0xD8, 0xD9, 0x6D, 0x36, + 0x4E, 0xA3, 0x85, 0x40, 0x4D, 0x72, 0xEC, 0x7B, 0xEF, 0x2B, 0x13, 0xE4, 0x6F, 0xDA, 0x23, 0x4F, + 0x1C, 0xE7, 0xEA, 0xD9, 0x17, 0x2B, 0xD6, 0x67, 0x79, 0x42, 0xC3, 0x81, 0x9A, 0x77, 0x64, 0xC7, + 0xC5, 0x44, 0xE1, 0xA4, 0xA3, 0x50, 0x8C, 0x1F, 0xCA, 0xD3, 0x6F, 0xC7, 0xFF, 0x2C, 0xBA, 0x7B, + 0x21, 0x0C, 0xF3, 0xA9, 0x6A, 0x89, 0x74, 0x33, 0x60, 0xA1, 0xF8, 0x9F, 0xAA, 0x39, 0xA9, 0x45, + 0x7E, 0x3D, 0x41, 0x67, 0x04, 0xF5, 0x9F, 0x47, 0x62, 0xAC, 0x65, 0xE0, 0x8D, 0x46, 0x9E, 0xD9, + 0xE5, 0x77, 0xD5, 0x8C, 0x47, 0xA2, 0xFB, 0x7D, 0x94, 0x27, 0xC9, 0xB9, 0x3F, 0x4D, 0xF4, 0xFD, + 0x19, 0x3C, 0xF6, 0x24, 0xAE, 0x70, 0xD7, 0x23, 0xE4, 0x64, 0x0A, 0xFC, 0x63, 0x89, 0x8A, 0xFE, + 0xD0, 0x8E, 0x48, 0x1A, 0xD8, 0xC3, 0xA9, 0xEC, 0x9D, 0x0F, 0xC7, 0xC5, 0x22, 0xBC, 0x45, 0x4A, + 0x2F, 0x4D, 0xF5, 0x0E, 0x4F, 0xFF, 0xAC, 0xE0, 0x55, 0xF4, 0x86, 0x04, 0x1B, 0x60, 0xDF, 0x4C, + 0x25, 0xB9, 0xEC, 0x10, 0x0C, 0x54, 0x16, 0xDF, 0x42, 0xF0, 0x07, 0x00, 0x28, 0x81, 0x7C, 0x95, + 0xAA, 0xC1, 0x01, 0xA3, 0xB8, 0xDF, 0x68, 0xCB, 0x55, 0xA7, 0x80, 0xCC, 0xE5, 0x3D, 0xE1, 0x68, + 0x10, 0x27, 0x56, 0x94, 0x67, 0xEC, 0x82, 0x66, 0x3D, 0x96, 0x76, 0xC3, 0xEE, 0x23, 0x02, 0x03, + 0x01, 0x00, 0x01, 0xA3, 0x50, 0x30, 0x4E, 0x30, 0x1D, 0x06, 0x03, 0x55, 0x1D, 0x0E, 0x04, 0x16, + 0x04, 0x14, 0xFF, 0xC8, 0xBA, 0x56, 0x74, 0xB1, 0x03, 0xA9, 0x79, 0x55, 0xFA, 0x58, 0x86, 0x13, + 0xDE, 0xC0, 0xFA, 0xF2, 0x94, 0x62, 0x30, 0x1F, 0x06, 0x03, 0x55, 0x1D, 0x23, 0x04, 0x18, 0x30, + 0x16, 0x80, 0x14, 0xFF, 0xC8, 0xBA, 0x56, 0x74, 0xB1, 0x03, 0xA9, 0x79, 0x55, 0xFA, 0x58, 0x86, + 0x13, 0xDE, 0xC0, 0xFA, 0xF2, 0x94, 0x62, 0x30, 0x0C, 0x06, 0x03, 0x55, 0x1D, 0x13, 0x04, 0x05, + 0x30, 0x03, 0x01, 0x01, 0xFF, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, + 0x01, 0x0B, 0x05, 0x00, 0x03, 0x82, 0x01, 0x01, 0x00, 0x3D, 0x35, 0x69, 0x87, 0xEB, 0x41, 0xA9, + 0x2A, 0x51, 0xF3, 0x28, 0x71, 0xB4, 0x06, 0x7F, 0x15, 0x5A, 0x6D, 0x88, 0x5B, 0xC8, 0x4C, 0xE1, + 0x6C, 0xC7, 0xCB, 0x93, 0x63, 0x69, 0xFB, 0xA6, 0x6D, 0xC7, 0x44, 0x6B, 0xD6, 0x39, 0x46, 0x34, + 0xFC, 0x45, 0x23, 0xD2, 0x29, 0x1B, 0xCC, 0x1C, 0x13, 0xD7, 0x63, 0x10, 0x81, 0xF5, 0x82, 0x45, + 0xEC, 0xDC, 0x20, 0x5F, 0xBB, 0xC3, 0xE6, 0x4A, 0x07, 0xA7, 0xBD, 0x9E, 0xFC, 0x5D, 0xFE, 0xC5, + 0x43, 0x3A, 0xC6, 0xA4, 0x6C, 0x5B, 0xF9, 0x63, 0x8F, 0xF9, 0xEB, 0xC2, 0xF4, 0xA7, 0xE4, 0x1B, + 0x23, 0xFA, 0xE1, 0x5A, 0x79, 0xC5, 0x1D, 0x1D, 0xFC, 0xAA, 0x81, 0xF7, 0x21, 0x52, 0xC9, 0x46, + 0x17, 0x1B, 0x24, 0x4B, 0x14, 0x5C, 0xF9, 0xB5, 0x86, 0x04, 0x80, 0x51, 0x95, 0xCF, 0x4E, 0x47, + 0x32, 0x8A, 0x1E, 0x52, 0x2E, 0xBF, 0x08, 0x8E, 0x9E, 0xE3, 0x88, 0x45, 0xC3, 0x75, 0xD7, 0xAE, + 0xC3, 0x7E, 0x7E, 0xE9, 0xC9, 0x5B, 0xD8, 0x58, 0x3B, 0x25, 0x53, 0x0C, 0x00, 0x21, 0x1A, 0x71, + 0x12, 0x23, 0xA0, 0x35, 0x6E, 0xC9, 0x7D, 0x83, 0x5C, 0x19, 0xE4, 0x05, 0x84, 0x46, 0x4E, 0x50, + 0xE2, 0x9E, 0x70, 0x2E, 0x74, 0x05, 0xEA, 0x31, 0x04, 0x55, 0xA7, 0xF4, 0x67, 0x95, 0xDC, 0x86, + 0x1F, 0x9D, 0xA0, 0x5D, 0x7F, 0x29, 0x48, 0x84, 0xEF, 0x13, 0xB8, 0xB3, 0xBF, 0x65, 0xD4, 0x52, + 0x98, 0x06, 0xE6, 0x8A, 0xB1, 0x36, 0xEA, 0x39, 0xB3, 0x04, 0x2B, 0x6E, 0x64, 0x6E, 0xF3, 0x20, + 0x74, 0xB6, 0x6E, 0x21, 0x3B, 0x99, 0xFE, 0x6E, 0x70, 0x48, 0x78, 0xEA, 0x31, 0x95, 0xB3, 0xB0, + 0x0E, 0x48, 0x83, 0x35, 0xA9, 0x74, 0xBF, 0x45, 0x07, 0xC8, 0x5A, 0x12, 0xA2, 0x4D, 0x16, 0xDB, + 0xB3, 0x1F, 0x72, 0xDE, 0x2A, 0x28, 0xFE, 0x7C, 0x2D +}; + +#endif /* RB_MBEDTLS_EMBEDDED_DATA_H */