[pve-devel] [PATCH cluster/manager/storage/docs 0/9] fix #4886: improve SSH handling

[Fabian Grünbichler]

this series replaces the old mechanism that used a cluster-wide merged known
hosts file with distributing of each node's host key via pmxcfs, and pinning
the distributed key explicitly for internal SSH connections.

the main changes in pve-cluster somewhat break the old manager and
storage versions, but only when such a partial upgrade is mixed with a
host key rotation of some sort.

pve-storage uses a newly introduced helper, so needs a versioned
dependency accordingly.

the last pve-docs patch has a placeholder for the actual version shipping the
changes which needs to be replaced when applying.

there's still some potential for follow-ups:
- 'pvecm ssh' wrapper to debug and/or re-use the host key pinning (and other
  future changes)
- also add non-RSA host keys
- key (and thus authorized keys) and/or sshd disentangling (this
  potentially also affects external access, so might be done on a major
  release to give more heads up)

cluster:

Fabian Grünbichler (4):
  fix #4886: write node SSH hostkey to pmxcfs
  fix #4886: SSH: pin node's host key if available
  ssh: expose SSH options on their own
  pvecm: stop merging SSH known hosts by default

 src/PVE/CLI/pvecm.pm     | 10 ++++++++--
 src/PVE/Cluster/Setup.pm | 24 +++++++++++++++++++++---
 src/PVE/SSHInfo.pm       | 31 +++++++++++++++++++++++++++----
 3 files changed, 56 insertions(+), 9 deletions(-)

docs:

Fabian Grünbichler (2):
  ssh: make pitfalls a regular section instead of block
  ssh: document PVE-specific setup

 pvecm.adoc | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

manager:

Fabian Grünbichler (2):
  vnc: use SSH command helper
  pvesh: use SSH command helper

 PVE/API2/Nodes.pm | 3 ++-
 PVE/CLI/pvesh.pm  | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

storage:

Fabian Grünbichler (1):
  upload: use SSH helper to get ssh/scp options

 src/PVE/API2/Storage/Status.pm | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.39.2