generate_config: Use eyaml to decrypt secret values

Note: IDF data encryption is not supported. Supporting that is
trivial, but it leads to slightly more complicated code, plus it
breaks support for multiline scalar encrypted data in the PDF ('>'),
forcing us to define each encrypted value as inline string.

While at it, fix silly limitation of jinja2 path residing in a subdir
of CWD.

Change-Id: I441ec754d8b6e4aad2ed73aba0b9b18ed65f05f4
Signed-off-by: agardner <agardner@linuxfoundation.org>
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

3 files changed, 101 insertions, 4 deletions

diff --git a/config/utils/README.eyaml.rst b/config/utils/README.eyaml.rst
new file mode 100644
index 00000000..083d5192
--- /dev/null
+++ b/config/utils/README.eyaml.rst
@@ -0,0 +1,67 @@
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. SPDX-License-Identifier: CC-BY-4.0
+.. (c) 2017 OPNFV and others.
+
+Use eyaml to decrypt secret values
+==================================
+
+Prerequisites
+-------------
+
+#. Install eyaml and create keys (All of this should be done on the slave server)
+
+    .. code-block:: bash
+
+        $ sudo yum install ruby-gems || sudo apt-get install ruby
+        $ sudo gem install hiera-eyaml
+        $ eyaml createkeys
+
+#. Move keys to /etc/eyaml_keys
+
+    .. code-block:: bash
+
+        $ sudo mkdir -p /etc/eyaml_keys/
+        $ sudo mv ./keys/* /etc/eyaml_keys/
+
+#. Set up eyaml config.yaml
+
+    .. code-block:: bash
+
+        $ mkdir ~/.eyaml/
+        $ cp config.yaml.example ~/.eyaml/config.yaml
+
+Encryption
+----------
+
+#. Copy a PDF (yaml) to current directory (or edit the PDF in-place)
+
+NOTE: There is a sample encrypted PDF located at `../pdf/pod1.encrypted.yaml`.
+Data in that file is only an example and can't be decrypted without the PEM,
+which is not provided.
+
+    .. code-block:: bash
+
+        $ cp ~/foo/securedlab/labs/lf/pod2.yaml .
+
+#. Create some encrypted values
+
+    .. code-block:: bash
+
+        $ eyaml encrypt -s 'opnfv'
+
+#. Replace values to be encrypted
+
+    .. code-block:: yaml
+
+        type: ipmi
+        versions:
+          - 2.0
+        user: ENC[PKCS7 ...]
+        pass: ENC[PKCS7 ...]
+
+Decryption
+----------
+
+    .. code-block:: bash
+
+        $ ./generate_config.py -y pod2.yaml -j ../installers/apex/pod_config.yaml.j2
diff --git a/config/utils/config.example.yaml b/config/utils/config.example.yaml
new file mode 100644
index 00000000..084d11d2
--- /dev/null
+++ b/config/utils/config.example.yaml
@@ -0,0 +1,11 @@
+##############################################################################
+# Copyright (c) 2017 OPNFV and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+---
+pkcs7_private_key: /etc/eyaml_keys/private_key.pkcs7.pem
+pkcs7_public_key: /etc/eyaml_keys/public_key.pkcs7.pem
diff --git a/config/utils/generate_config.py b/config/utils/generate_config.py
index 18af98db..ba4192cb 100755
--- a/config/utils/generate_config.py
+++ b/config/utils/generate_config.py
@@ -1,10 +1,20 @@
 #!/usr/bin/python
+##############################################################################
+# Copyright (c) 2017 OPNFV and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
 """This module does blah blah."""
 import argparse
 import ipaddress
+import logging
 import os
 import yaml
 from jinja2 import Environment, FileSystemLoader
+from subprocess import CalledProcessError, check_output
 
 PARSER = argparse.ArgumentParser()
 PARSER.add_argument("--yaml", "-y", type=str, required=True)
@@ -38,12 +48,20 @@ def dpkg_arch(arch, to_dpkg=True):
     else:
         return ARCH_DPKG_TABLE[arch]
 
-ENV = Environment(loader=FileSystemLoader('./'))
+ENV = Environment(loader=FileSystemLoader(os.path.dirname(ARGS.jinja2)))
 ENV.filters['ipaddr_index'] = ipaddr_index
 ENV.filters['dpkg_arch'] = dpkg_arch
 
-with open(ARGS.yaml) as _:
-    DICT = yaml.safe_load(_)
+# Run `eyaml decrypt` on the whole file, in case any PDF data is encrypted
+# Note: eyaml return code is 0 even if keys are not available
+try:
+    DICT = yaml.safe_load(check_output(['eyaml', 'decrypt', '-f', ARGS.yaml]))
+except CalledProcessError as ex:
+    pass
+if not DICT:
+    logging.warn('PDF decryption failed, fallback to using raw data.')
+    with open(ARGS.yaml) as _:
+        DICT = yaml.safe_load(_)
 
 # If an installer descriptor file (IDF) exists, include it (temporary)
 IDF_PATH = '/idf-'.join(os.path.split(ARGS.yaml))
@@ -56,6 +74,7 @@ if os.path.exists(IDF_PATH):
 # print(DICT)
 
 # Render template and print generated conf to console
-TEMPLATE = ENV.get_template(ARGS.jinja2)
+TEMPLATE = ENV.get_template(os.path.basename(ARGS.jinja2))
+
 #pylint: disable=superfluous-parens
 print(TEMPLATE.render(conf=DICT))