Complete the HTTP GET example
This commit is contained in:
Stefan Schake
Milosch Meriac
parent
3e1a0c2091
commit
ca6dfd5099
1 changed files with 122 additions and 89 deletions
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@ -1,13 +1,13 @@
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/* http_get_mbedtls - HTTPS version of the http_get example, using mbed TLS.
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/* http_get_bearssl - HTTPS version of the http_get example, using BearSSL.
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*
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* Retrieves a JSON response from the howsmyssl.com API via HTTPS over TLS v1.2.
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*
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* Validates the server's certificate using the root CA loaded (in PEM format) in cert.c.
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* Validates the server's certificate using a hardcoded public key.
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*
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* Adapted from the ssl_client1 example in mbedtls.
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* Adapted from the client_basic sample in BearSSL.
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*
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* Original Copyright (C) 2006-2015, ARM Limited, All Rights Reserved, Apache 2.0 License.
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* Additions Copyright (C) 2015 Angus Gratton, Apache 2.0 License.
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* Original Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>, MIT License.
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* Additions Copyright (C) 2016 Stefan Schake, MIT License.
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*/
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#include "espressif/esp_common.h"
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#include "esp/uart.h"
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@ -35,83 +35,47 @@
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#define GET_REQUEST "GET "WEB_URL" HTTP/1.1\nHost: "WEB_SERVER"\n\n"
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static const unsigned char TA0_DN[] = {
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0x30, 0x1C, 0x31, 0x0B, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13,
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0x02, 0x43, 0x41, 0x31, 0x0D, 0x30, 0x0B, 0x06, 0x03, 0x55, 0x04, 0x03,
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0x13, 0x04, 0x52, 0x6F, 0x6F, 0x74
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/*
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* howsmyssl.com public key
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* BearSSL doesn't allow disabling validation and we don't have
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* a correct date/time on the ESP so it would always fail.
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* Instead, we compare the server key against this static public key
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* to validate the server.
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*/
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static const unsigned char SERVER_PKEY_RSA_N[] = {
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0xA9, 0x11, 0x5C, 0xAF, 0x4F, 0xDD, 0xEB, 0x88, 0xCD, 0xF6, 0x47, 0x11,
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0xB9, 0x7F, 0xFA, 0x08, 0xD7, 0x90, 0x01, 0x14, 0x36, 0x84, 0xBF, 0xE2,
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0xD8, 0xC4, 0x26, 0xBF, 0xD3, 0x6B, 0xBA, 0x2E, 0x06, 0x9C, 0x23, 0x95,
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0x98, 0x8E, 0xC0, 0xC5, 0x91, 0xF0, 0xC6, 0xC3, 0x39, 0x98, 0x04, 0xC6,
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0x78, 0x14, 0x13, 0x08, 0xA7, 0x12, 0x3D, 0x86, 0x1A, 0x14, 0x71, 0x35,
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0x7E, 0xFB, 0x8B, 0xF8, 0xA1, 0x52, 0x21, 0x5B, 0xDE, 0x51, 0x5A, 0x3A,
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0x35, 0x6F, 0x8F, 0xDB, 0xF9, 0x6A, 0xA5, 0xF2, 0x74, 0x6E, 0xCA, 0xFC,
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0xA4, 0x70, 0xCC, 0x70, 0x4D, 0x5E, 0x4E, 0x69, 0xA2, 0xFE, 0x42, 0x23,
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0x8A, 0xC0, 0x01, 0x3B, 0xEF, 0x46, 0xB4, 0xC2, 0x6F, 0x48, 0x26, 0xDD,
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0xF5, 0x05, 0x9B, 0x69, 0x88, 0xB0, 0x7D, 0x38, 0xA8, 0x49, 0x07, 0x11,
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0xE5, 0xFE, 0x27, 0x0F, 0x4F, 0x28, 0x83, 0x18, 0xAB, 0x47, 0x1F, 0x72,
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0x40, 0xEC, 0x67, 0x16, 0xBE, 0x45, 0x76, 0x0B, 0x83, 0x91, 0xE5, 0x42,
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0xC2, 0xA2, 0x5B, 0xF2, 0xEB, 0xB1, 0x8C, 0x37, 0x0F, 0x4B, 0x5E, 0x0F,
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0x05, 0x7D, 0x54, 0x48, 0x9F, 0x55, 0xAE, 0x41, 0xC9, 0x07, 0x6F, 0xD7,
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0xB3, 0xF3, 0xE2, 0x61, 0x18, 0x03, 0x48, 0xA1, 0x3C, 0x8D, 0xBD, 0x5C,
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0xCD, 0x3B, 0x55, 0xCD, 0x97, 0xE3, 0xD1, 0x80, 0x8A, 0x30, 0x88, 0x3A,
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0xAC, 0xEE, 0x64, 0x08, 0xBD, 0x74, 0x82, 0x24, 0x82, 0x11, 0xD4, 0x93,
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0xFA, 0xEF, 0x52, 0x5F, 0x2C, 0x51, 0x0C, 0x88, 0x09, 0xB9, 0x77, 0xA0,
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0xFA, 0x6F, 0xAB, 0xEB, 0xE1, 0x08, 0x5C, 0xA5, 0x02, 0x53, 0xA1, 0x18,
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0xFC, 0xB8, 0x06, 0x67, 0x7E, 0x80, 0xDF, 0xF1, 0xCD, 0xAE, 0x23, 0x58,
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0xCD, 0xCE, 0x7C, 0x69, 0x2E, 0x4D, 0xD6, 0xB0, 0xD2, 0x6D, 0x11, 0x85,
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0x5E, 0x36, 0x41, 0x27
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};
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static const unsigned char TA0_RSA_N[] = {
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0xB6, 0xD9, 0x34, 0xD4, 0x50, 0xFD, 0xB3, 0xAF, 0x7A, 0x73, 0xF1, 0xCE,
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0x38, 0xBF, 0x5D, 0x6F, 0x45, 0xE1, 0xFD, 0x4E, 0xB1, 0x98, 0xC6, 0x60,
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0x83, 0x26, 0xD2, 0x17, 0xD1, 0xC5, 0xB7, 0x9A, 0xA3, 0xC1, 0xDE, 0x63,
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0x39, 0x97, 0x9C, 0xF0, 0x5E, 0x5C, 0xC8, 0x1C, 0x17, 0xB9, 0x88, 0x19,
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0x6D, 0xF0, 0xB6, 0x2E, 0x30, 0x50, 0xA1, 0x54, 0x6E, 0x93, 0xC0, 0xDB,
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0xCF, 0x30, 0xCB, 0x9F, 0x1E, 0x27, 0x79, 0xF1, 0xC3, 0x99, 0x52, 0x35,
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0xAA, 0x3D, 0xB6, 0xDF, 0xB0, 0xAD, 0x7C, 0xCB, 0x49, 0xCD, 0xC0, 0xED,
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0xE7, 0x66, 0x10, 0x2A, 0xE9, 0xCE, 0x28, 0x1F, 0x21, 0x50, 0xFA, 0x77,
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0x4C, 0x2D, 0xDA, 0xEF, 0x3C, 0x58, 0xEB, 0x4E, 0xBF, 0xCE, 0xE9, 0xFB,
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0x1A, 0xDA, 0xA3, 0x83, 0xA3, 0xCD, 0xA3, 0xCA, 0x93, 0x80, 0xDC, 0xDA,
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0xF3, 0x17, 0xCC, 0x7A, 0xAB, 0x33, 0x80, 0x9C, 0xB2, 0xD4, 0x7F, 0x46,
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0x3F, 0xC5, 0x3C, 0xDC, 0x61, 0x94, 0xB7, 0x27, 0x29, 0x6E, 0x2A, 0xBC,
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0x5B, 0x09, 0x36, 0xD4, 0xC6, 0x3B, 0x0D, 0xEB, 0xBE, 0xCE, 0xDB, 0x1D,
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0x1C, 0xBC, 0x10, 0x6A, 0x71, 0x71, 0xB3, 0xF2, 0xCA, 0x28, 0x9A, 0x77,
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0xF2, 0x8A, 0xEC, 0x42, 0xEF, 0xB1, 0x4A, 0x8E, 0xE2, 0xF2, 0x1A, 0x32,
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0x2A, 0xCD, 0xC0, 0xA6, 0x46, 0x2C, 0x9A, 0xC2, 0x85, 0x37, 0x91, 0x7F,
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0x46, 0xA1, 0x93, 0x81, 0xA1, 0x74, 0x66, 0xDF, 0xBA, 0xB3, 0x39, 0x20,
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0x91, 0x93, 0xFA, 0x1D, 0xA1, 0xA8, 0x85, 0xE7, 0xE4, 0xF9, 0x07, 0xF6,
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0x10, 0xF6, 0xA8, 0x27, 0x01, 0xB6, 0x7F, 0x12, 0xC3, 0x40, 0xC3, 0xC9,
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0xE2, 0xB0, 0xAB, 0x49, 0x18, 0x3A, 0x64, 0xB6, 0x59, 0xB7, 0x95, 0xB5,
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0x96, 0x36, 0xDF, 0x22, 0x69, 0xAA, 0x72, 0x6A, 0x54, 0x4E, 0x27, 0x29,
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0xA3, 0x0E, 0x97, 0x15
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static const unsigned char SERVER_PKEY_RSA_E[] = {
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0x01, 0x00, 0x01
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};
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static const unsigned char TA0_RSA_E[] = {
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0x01, 0x00, 0x01
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static const br_rsa_public_key server_pkey = {
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(unsigned char *)SERVER_PKEY_RSA_N, sizeof SERVER_PKEY_RSA_N,
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(unsigned char *)SERVER_PKEY_RSA_E, sizeof SERVER_PKEY_RSA_E,
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};
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static const unsigned char TA1_DN[] = {
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0x30, 0x1C, 0x31, 0x0B, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13,
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0x02, 0x43, 0x41, 0x31, 0x0D, 0x30, 0x0B, 0x06, 0x03, 0x55, 0x04, 0x03,
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0x13, 0x04, 0x52, 0x6F, 0x6F, 0x74
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};
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static const unsigned char TA1_EC_Q[] = {
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0x04, 0x71, 0x74, 0xBA, 0xAB, 0xB9, 0x30, 0x2E, 0x81, 0xD5, 0xE5, 0x57,
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0xF9, 0xF3, 0x20, 0x68, 0x0C, 0x9C, 0xF9, 0x64, 0xDB, 0xB4, 0x20, 0x0D,
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0x6D, 0xEA, 0x40, 0xD0, 0x4A, 0x6E, 0x42, 0xFD, 0xB6, 0x9A, 0x68, 0x25,
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0x44, 0xF6, 0xDF, 0x7B, 0xC4, 0xFC, 0xDE, 0xDD, 0x7B, 0xBB, 0xC5, 0xDB,
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0x7C, 0x76, 0x3F, 0x41, 0x66, 0x40, 0x6E, 0xDB, 0xA7, 0x87, 0xC2, 0xE5,
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0xD8, 0xC5, 0xF3, 0x7F, 0x8D
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};
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static const br_x509_trust_anchor TAs[2] = {
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{
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(unsigned char *)TA0_DN, sizeof TA0_DN,
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BR_X509_TA_CA,
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{
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BR_KEYTYPE_RSA,
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{ .rsa = {
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(unsigned char *)TA0_RSA_N, sizeof TA0_RSA_N,
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(unsigned char *)TA0_RSA_E, sizeof TA0_RSA_E,
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} }
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}
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},
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{
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(unsigned char *)TA1_DN, sizeof TA1_DN,
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BR_X509_TA_CA,
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{
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BR_KEYTYPE_EC,
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{ .ec = {
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BR_EC_secp256r1,
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(unsigned char *)TA1_EC_Q, sizeof TA1_EC_Q,
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} }
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}
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}
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};
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#define TAs_NUM 2
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/*
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* Low-level data read callback for the simplified SSL I/O API.
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*/
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@ -152,20 +116,27 @@ sock_write(void *ctx, const unsigned char *buf, size_t len)
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}
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}
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// In mono mode, BearSSL requires ~16k of buffer
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// TODO: investigate Maximum Fragment Length (RFC 6066) extension
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/*
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* Buffer to store a record + BearSSL state
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* We use MONO mode to save 16k of RAM.
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* This could be even smaller by using max_fragment_len, but
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* the howsmyssl.com server doesn't seem to support it.
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*/
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static unsigned char bearssl_buffer[BR_SSL_BUFSIZE_MONO];
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static br_ssl_client_context sc;
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static br_x509_minimal_context xc;
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static br_x509_knownkey_context kkc;
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static br_sslio_context ioc;
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void http_get_task(void *pvParameters)
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{
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int successes = 0, failures = 0;
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while (1) {
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/* Wait until we can resolve the DNS for the server, as an indication
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our network is probably working...
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*/
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/*
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* Wait until we can resolve the DNS for the server, as an indication
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* our network is probably working...
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*/
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const struct addrinfo hints = {
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.ai_family = AF_INET,
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.ai_socktype = SOCK_STREAM,
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@ -188,15 +159,45 @@ void http_get_task(void *pvParameters)
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}
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printf("Initializing BearSSL... ");
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br_ssl_client_init_full(&sc, &xc, TAs, TAs_NUM);
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br_ssl_client_init_full(&sc, &xc, NULL, 0);
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/*
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* Overwrite the default X509 engine with a much simpler known key one
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* This sidesteps validation failure in the default engine, as we have no date/time
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* Instead, the servers key is compared to the hardcoded public key above
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*/
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br_x509_knownkey_init_rsa(&kkc, &server_pkey);
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br_ssl_engine_set_x509(&sc.eng, &kkc.vtable);
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/*
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* Set the I/O buffer to the provided array. We allocated a
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* buffer large enough for full-duplex behaviour with all
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* allowed sizes of SSL records, hence we set the last argument
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* to 1 (which means "split the buffer into separate input and
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* output areas").
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*/
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br_ssl_engine_set_buffer(&sc.eng, bearssl_buffer, sizeof bearssl_buffer, 0);
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// Inject some entropy from the ESP hardware RNG
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// This is necessary because we don't support any of the BearSSL methods
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/*
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* Inject some entropy from the ESP hardware RNG
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* This is necessary because we don't support any of the BearSSL methods
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*/
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for (int i = 0; i < 10; i++) {
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int rand = hwrand();
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br_ssl_engine_inject_entropy(&sc.eng, &rand, 4);
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}
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/*
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* Reset the client context, for a new handshake. We provide the
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* target host name: it will be used for the SNI extension. The
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* last parameter is 0: we are not trying to resume a session.
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*/
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br_ssl_client_reset(&sc, WEB_SERVER, 0);
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/*
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* Initialise the simplified I/O wrapper context, to use our
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* SSL client context, and the two callbacks for socket I/O.
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*/
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br_sslio_init(&ioc, &sc.eng, sock_read, &fd, sock_write, &fd);
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printf("done.\r\n");
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@ -210,16 +211,34 @@ void http_get_task(void *pvParameters)
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}
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printf("Connected\r\n");
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if (br_sslio_write_all(&ioc, GET_REQUEST, strlen(GET_REQUEST)) != BR_ERR_OK)
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{
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/*
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* Note that while the context has, at that point, already
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* assembled the ClientHello to send, nothing happened on the
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* network yet. Real I/O will occur only with the next call.
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*
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* We write our simple HTTP request. We test the call
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* for an error (-1), but this is not strictly necessary, since
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* the error state "sticks": if the context fails for any reason
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* (e.g. bad server certificate), then it will remain in failed
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* state and all subsequent calls will return -1 as well.
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*/
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if (br_sslio_write_all(&ioc, GET_REQUEST, strlen(GET_REQUEST)) != BR_ERR_OK) {
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close(fd);
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freeaddrinfo(res);
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printf("br_sslio_write_all failed: %d\r\n", br_ssl_engine_last_error(&sc.eng));
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failures++;
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continue;
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}
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/*
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* SSL is a buffered protocol: we make sure that all our request
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* bytes are sent onto the wire.
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*/
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br_sslio_flush(&ioc);
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/*
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* Read and print the server response
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*/
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for (;;)
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{
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int rlen;
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@ -237,15 +256,29 @@ void http_get_task(void *pvParameters)
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}
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}
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/*
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* If reading the response failed for any reason, we detect it here
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*/
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if (br_ssl_engine_last_error(&sc.eng) != BR_ERR_OK) {
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close(fd);
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freeaddrinfo(res);
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printf("failure, error = %d\r\n", br_ssl_engine_last_error(&sc.eng));
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failures++;
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continue;
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}
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/*
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* Close the connection and start over after a delay
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*/
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close(fd);
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freeaddrinfo(res);
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successes++;
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printf("successes = %d failures = %d\r\n", successes, failures);
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printf("\r\n\r\nsuccesses = %d failures = %d\r\n", successes, failures);
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for(int countdown = 10; countdown >= 0; countdown--) {
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printf("%d... ", countdown);
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printf("%d...\n", countdown);
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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printf("\r\nStarting again!\r\n");
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printf("Starting again!\r\n\r\n");
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}
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}
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