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authorChristian Poessinger <christian@poessinger.com>2020-07-11 17:55:21 +0200
committerChristian Poessinger <christian@poessinger.com>2020-07-11 17:55:21 +0200
commitd9c7dfb1e7a8ad4a44b571e3d4b8d87ff3898678 (patch)
treebd9a273b36de1357178cf6c2e13f482c981aac1d /src/systemd
parent8eb65fa66974e2b409fb367fe9fb2c5d65fc8332 (diff)
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snmp: T2687: precalculate snmpv3 encrypted keys
As of now when adding new credentials for any SNMPv3 user we submit the credential either plaintext or encrypted. A plaintext credential will be hashed by SNMPd in the background and then passed back into the CLI so it's not stored in cleartext. This feels like the wrong way in changing the CLI content with data produced by a 3rd party daemon which implements the service. It feels like the tail wiggles the entire dog. This should be changed in the following way: - After retrieving the plaintext password from CLI, use Python to hash the key in advance - Re-populate the encrypted key into the CLI and drop the plaintext one - Generate service configuration and continue startup of SNMPd This also fixes a race condition when SNMPd started up but not properly provided the hasehd keys in the configuration resulting in a ConfigurationError. Now as we also support binding SNMPd to a VRF this fixes a deadlock situation on bootup as we can only bind late to the VRF and require up to 5 restarts of the service - but the service will never start.
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