Libvirt secrets are stored unencrypted on the disk.
With this series we want to start encrypting the secrets.

1. Introduce the GnuTLS decryption wrapper functions that
   work exact opposite to the encryption wrappers.

2. Add a new service called virt-secrets-init-encryption, that is
   linked to the virtsecretd and libvirtd service.
   virtsecretd and libvirtd services only starts
   after the new service generates a random encryption key.

3. Add a new secret.conf configuration file that helps user to set
   a. secrets_encryption_key - allows the user to specify the encryption
      key file path, in case the default key is not to be used.
   b. encrypt_data - set to 0 or 1. If set to 1, then the newly
      added secrets will be encrypted.

4. Rename the file name attribute in virSecretObj structure to secretValueFile.

5. Once we have the encryption key, and a reliable way to tell the daemon
   what encryption scheme the secret object is using, we can encrypt the
   secrets on disk and store them in <uuid>.<encryption_scheme> format.
   It is important to note that if the encryption key is changed between
   restarts, then the respective secret will not be loaded by the driver.

This is a sincere attempt to improve upon the already submitted patch
https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/KE6GVZQ45JTYFTE54CT7DMONSO2W3ZPV/

Resolves: https://issues.redhat.com/browse/RHEL-7125

---
Changes in v2:
- Fixed a regression in the decryption logic. ciphertext length was
  incorrectly calculated.
- Removed virSecretEncryptionScheme enum. It is no longer required.
  All the changes will be done at one place i.e. schemeInfo array.
  In future we can append to the array, when we want to add new cipher
  modes.
- Add Requires= and After= directives in libvirtd service. Remove
  unnecessary configuration settings from src/secret meson.build.
- Other minor refactoring and header include fix.

Arun Menon (5):
  util: Add support for GnuTLS decryption
  secret: Set up default encryption secret key for the virtsecretd
    service
  secret: Add secret.conf configuration file and parse it
  secret: Rename virSecretObj structure attribute from base64File to
    secretValueFile
  secret: Add functionality to load and save secrets in encrypted format

 include/libvirt/virterror.h                   |   1 +
 libvirt.spec.in                               |   7 +
 po/POTFILES                                   |   1 +
 src/conf/virsecretobj.c                       | 183 ++++++++++++++----
 src/conf/virsecretobj.h                       |  18 +-
 src/libvirt_private.syms                      |   1 +
 src/meson.build                               |   1 +
 src/remote/libvirtd.service.in                |   4 +
 src/secret/libvirt_secrets.aug                |  40 ++++
 src/secret/meson.build                        |  31 +++
 src/secret/secret.conf.in                     |  14 ++
 src/secret/secret_config.c                    | 179 +++++++++++++++++
 src/secret/secret_config.h                    |  40 ++++
 src/secret/secret_driver.c                    |  34 +++-
 src/secret/test_libvirt_secrets.aug.in        |   6 +
 .../virt-secret-init-encryption.service.in    |   8 +
 src/secret/virtsecretd.service.extra.in       |   8 +
 src/util/vircrypto.c                          | 126 +++++++++++-
 src/util/vircrypto.h                          |   8 +
 src/util/virerror.c                           |   3 +
 tests/vircryptotest.c                         |  65 +++++++
 21 files changed, 728 insertions(+), 50 deletions(-)
 create mode 100644 src/secret/libvirt_secrets.aug
 create mode 100644 src/secret/secret.conf.in
 create mode 100644 src/secret/secret_config.c
 create mode 100644 src/secret/secret_config.h
 create mode 100644 src/secret/test_libvirt_secrets.aug.in
 create mode 100644 src/secret/virt-secret-init-encryption.service.in

-- 
2.51.1