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BearSSL (https://www.bearssl.org) is a TLS(SSL) library written by Thomas Pornin that is optimized for lower-memory embedded systems like the ESP8266. It supports a wide variety of modern ciphers and is unique in that it doesn't perform any memory allocations during operation (which is the unfortunate bane of the current axTLS). BearSSL is also absolutely focused on security and by default performs all its security checks on x.509 certificates during the connection phase (but if you want to be insecure and dangerous, that's possible too). While it does support unidirectional SSL buffers, like axTLS, as implemented the ESP8266 wrappers only support bidirectional buffers. These bidirectional buffers avoid deadlocks in protocols which don't have well separated receive and transmit periods. This patch adds several classes which allow connecting to TLS servers using this library in almost the same way as axTLS: BearSSL::WiFiClientSecure - WiFiClient that supports TLS BearSSL::WiFiServerSecure - WiFiServer supporting TLS and client certs It also introduces objects for PEM/DER encoded keys and certificates: BearSSLX509List - x.509 Certificate (list) for general use BearSSLPrivateKey - RSA or EC private key BearSSLPublicKey - RSA or EC public key (i.e. from a public website) Finally, it adds a Certificate Authority store object which lets BearSSL access a set of trusted CA certificates on SPIFFS to allow it to verify the identity of any remote site on the Internet, without requiring RAM except for the single matching certificate. CertStoreSPIFFSBearSSL - Certificate store utility Client certificates are supported for the BearSSL::WiFiClientSecure, and what's more the BearSSL::WiFiServerSecure can also *require* remote clients to have a trusted certificate signed by a specific CA (or yourself with self-signing CAs). Maximum Fragment Length Negotiation probing and usage are supported, but be aware that most sites on the Internet don't support it yet. When available, you can reduce the memory footprint of the SSL client or server dramatically (i.e. down to 2-8KB vs. the ~22KB required for a full 16K receive fragment and 512b send fragment). You can also manually set a smaller fragment size and guarantee at your protocol level all data will fit within it. Examples are included to show the usage of these new features. axTLS has been moved to its own namespace, "axtls". A default "using" clause allows existing apps to run using axTLS without any changes. The BearSSL::WiFi{client,server}Secure implements the axTLS client/server API which lets many end user applications take advantage of BearSSL with few or no changes. The BearSSL static library used presently is stored at https://github.com/earlephilhower/bearssl-esp8266 and can be built using the standard ESP8266 toolchain.
52 lines
1.5 KiB
Python
Executable File
52 lines
1.5 KiB
Python
Executable File
#!/usr/bin/python
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# This script pulls the list of Mozilla trusted certificate authorities
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# from the web at the "mozurl" below, parses the file to grab the PEM
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# for each cert, and then generates DER files in a new ./data directory
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# Upload these to a SPIFFS filesystem and use the CertManager to parse
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# and use them for your outgoing SSL connections.
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#
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# Script by Earle F. Philhower, III. Released to the public domain.
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import csv
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from os import mkdir
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from subprocess import Popen, PIPE
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import urllib2
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try:
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# for Python 2.x
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from StringIO import StringIO
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except ImportError:
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# for Python 3.x
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from io import StringIO
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# Mozilla's URL for the CSV file with included PEM certs
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mozurl = "https://ccadb-public.secure.force.com/mozilla/IncludedCACertificateReportPEMCSV"
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# Load the manes[] and pems[] array from the URL
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names = []
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pems = []
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response = urllib2.urlopen(mozurl)
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csvData = response.read()
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csvReader = csv.reader(StringIO(csvData))
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for row in csvReader:
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names.append(row[0]+":"+row[1]+":"+row[2])
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pems.append(row[28])
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del names[0] # Remove headers
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del pems[0] # Remove headers
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# Try and make ./data, skip if present
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try:
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os.mkdir("data")
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except:
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pass
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# Process the text PEM using openssl into DER files
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for i in range(0, len(pems)):
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certName = "data/ca_%03d.der" % (i);
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thisPem = pems[i].replace("'", "")
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print names[i] + " -> " + certName
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pipe = Popen(['openssl','x509','-inform','PEM','-outform','DER','-out', certName], shell = False, stdin = PIPE).stdin
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pipe.write(thisPem)
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pipe.close
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