micropython/certificates: Add installable certs.

This adds a method to include default/installable
certificates from Mozilla's CA store which could
solve the default certs problem from micropython/micropython#8968

Signed-off-by: Carlos Gil <carlosgilglez@gmail.com>

micropython/certificates/Makefile

@@ -0,0 +1,20 @@
+
+VERSION ?=0.0.1
+
+certifi: ca-bundle.crt ca_bundle_mp.py
+	./make-certifi.py $(VERSION) 
+
+ca-bundle.crt:
+	./mk-ca-bundle.pl 
+	rm certdata.txt
+
+ca_bundle_mp.py: ca-bundle.crt cmn_crt_authorities.csv 
+	./make-ca-bundle.py ca-bundle.crt cmn_crt_authorities.csv
+
+cmn_crt_authorities.csv:
+	echo cmn_crt_authorities.csv
+
+clean:
+	rm ca-bundle.crt
+	rm ca_bundle_mp.py
+

micropython/certificates/README.md

@@ -0,0 +1,90 @@
+
+## MicroPython Certifi
+
+This is an approach to include Root CA certificates from the most common Certificate Authorities following 
+
+current [ssl certificates usage statistics](https://w3techs.com/technologies/overview/ssl_certificate)
+
+### Ca-bundle Instructions
+---------------------
+#### 1. Download ca-bundle.crt
+`ca-bundle.crt` is obtained using *curl's* script `mk-ca-bundle.pl` from [curl](https://github.com/curl/curl) repo in `curl/scripts` dir, 
+which obtains the certificates from [mozilla's CA store](https://www.mozilla.org/en-US/about/governance/policies/security-group/certs/policy/). 
+
+```console
+$ ./mk-ca-bundle.pl
+SHA256 of old file: 0
+Downloading certdata.txt ...
+Get certdata with curl!
+  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
+                                 Dload  Upload   Total   Spent    Left  Speed
+100 1278k  100 1278k    0     0   264k      0  0:00:04  0:00:04 --:--:--  264k
+Downloaded certdata.txt
+SHA256 of new file: 90c470e705b4b5f36f09684dc50e2b79c8b86989a848b62cd1a7bd6460ee65f6
+Processing  'certdata.txt' ...
+Done (136 CA certs processed, 24 skipped).
+```
+
+#### 2. Filter ca-bundle.crt
+
+
+Using `make-ca-bundle.py` [^1] to filter `ca-bundle.crt` using the names of the most common Certificate Authorities in `cmn_crt_authorities.csv`.
+
+```console
+$ ./make-ca-bundle.py ca-bundle.crt cmn_crt_authorities.csv
+```
+
+This will create `ca_bundle_mp.py` file with the selected certificates.
+
+
+#### 3. Split `ca_bundle_mp.py` into ca-bundles grouped by CA.
+
+Using `make-certifi.py` will split the filtered ca-bundle into installable packages by CA name
+.e.g `require("certifi-digicert")`
+
+
+#### 4. Automate using Makefile
+
+Automate updates to ca-certificates using `$ make certifi`
+
+
+#### 5. Default ca-bundle.
+
+`certifi` package will include CA Root certs `ISRG Root X1` which is used to validate MicroPython `mip` server and `DigiCert Global Root CA`, which is used to validate `github.com`. This way `mip` can validate by default that the package being installed comes in fact from MicroPython package index server, or from the github repo of a 3rd party package. 
+
+
+#### 6. Install
+
+In a manifest file:
+```python
+require("certifi")
+# or any additional bundle e.g.
+# require("certifi-digicert")
+```
+Install additional bundles with mip at runtime
+```console
+>>> import mip
+>>> mip.install("certifi-digicert")
+```
+
+#### 7. Usage
+
+```console
+>>> import certifi
+# check config
+>>> certifi.config()
+{'certs': 'certifi.default', 'path': 'cacerts'}
+```
+Defaults can be configured, where `certs` can be the module where CA certs are or the CA cert chain as bytes. And `path` is where CA certs files will be loaded from. 
+If both options are indicated, then both CA certs will be concatenated into CA cert chain. 
+
+
+```console
+# get default certificates
+>>> certifi.load_ca_certs()
+b'\nISRG Root X1\n============\n-----BEGIN CERTIFICATE-----\nMIIFazCCA1OgAwIBAgIRAIIQz7DS...'
+```
+
+### Notes:
+
+[^1]: This script is adapted from `esp-idf/components/mbedtls/esp_crt_bundle/`

micropython/certificates/certifi-amazon/amazon.crt

@@ -0,0 +1,94 @@
+Starfield Services Root Certificate Authority - G2
+==================================================
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+Amazon Root CA 1
+================
+-----BEGIN CERTIFICATE-----
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+Amazon Root CA 2
+================
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+Amazon Root CA 3
+================
+-----BEGIN CERTIFICATE-----
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+Amazon Root CA 4
+================
+-----BEGIN CERTIFICATE-----
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micropython/certificates/certifi-amazon/manifest.py

@@ -0,0 +1,5 @@
+metadata(description="amazon CA certificates.", version="0.0.1")
+
+require("certifi")
+
+package("certifi", files=("amazon.py",), base_path="../certifi", opt=3)

micropython/certificates/certifi-default/default.crt

@@ -0,0 +1,51 @@
+
+DigiCert Global Root CA
+=======================
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+ISRG Root X1
+============
+-----BEGIN CERTIFICATE-----
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+e5AW0wdeRlN8NwdCjNPElpzVmbUq4JUagEiuTDkHzsxHpFKVK7q4+63SM1N95R1NbdWhscdCb+ZA
+JzVcoyi3B43njTOQ5yOf+1CceWxG1bQVs5ZufpsMljq4Ui0/1lvh+wjChP4kqKOJ2qxq4RgqsahD
+YVvTH9w7jXbyLeiNdd8XM2w9U/t7y0Ff/9yi0GE44Za4rF2LN9d11TPAmRGunUHBcnWEvgJBQl9n
+JEiU0Zsnvgc/ubhPgXRR4Xq37Z0j4r7g1SgEEzwxA57demyPxgcYxn/eR44/KJ4EBs+lVDR3veyJ
+m+kXQ99b21/+jh5Xos1AnX5iItreGCc=
+-----END CERTIFICATE-----

micropython/certificates/certifi-default/manifest.py

@@ -0,0 +1,5 @@
+metadata(description="default CA certificates.", version="0.0.1")
+
+require("certifi")
+
+package("certifi", files=("default.py",), base_path="../certifi", opt=3)