open-consul/agent/auto-config/config_translate.go

161 lines
6.4 KiB
Go

package autoconf
import (
pbconfig "github.com/hashicorp/consul/agent/agentpb/config"
)
// translateAgentConfig is meant to take in a agent/agentpb/config.Config type
// and craft the corresponding agent/config.Config type. The need for this function
// should eventually be removed with the protobuf and normal version converging.
// In the meantime, its not desirable to have the flatter Config struct in protobufs
// as in the long term we want a configuration with more nested groupings.
//
// Why is this function not in the agent/agentpb/config package? The answer, that
// package cannot import the agent/config package without running into import cycles.
//
// If this function is meant to output an agent/config.Config then why does it output
// a map[string]interface{}? The answer is that our config and command line option
// parsing is messed up and it would require major changes to fix (we probably should
// do them but not for the auto-config feature). To understand this we need to work
// backwards. What we want to be able to do is persist the config settings from an
// auto-config response configuration to disk. We then want that configuration
// to be able to be parsed with the normal configuration parser/builder. It sort of was
// working with returning a filled out agent/config.Config but the problem was that
// the struct has a lot of non-pointer struct members. Thus, JSON serializtion caused
// these to always be emitted even if they contained no non-empty fields. The
// configuration would then seem to parse okay, but in OSS we would get warnings for
// setting a bunch of enterprise fields like "audit" at the top level. In an attempt
// to quiet those warnings, I had converted all the existing non-pointer struct fields
// to pointers. Then there were issues with the builder code expecting concrete values.
// I could add nil checks **EVERYWHERE** in builder.go or take a different approach.
// I then made a function utilizing github.com/mitchellh/reflectwalk to un-nil all the
// struct pointers after parsing to prevent any nil pointer dereferences. At first
// glance this seemed like it was going to work but then I saw that nearly all of the
// tests in runtime_test.go were failing. The first issues was that we were not merging
// pointers to struct fields properly. It was simply taking the new pointer if non-nil
// and defaulting to the original. So I updated that code, to properly merge pointers
// to structs. That fixed a bunch of tests but then there was another issue with
// the runtime tests where it was emitting warnings for using consul enterprise only
// configuration. After spending some time tracking this down it turns out that it
// was coming from our CLI option parsing. Our CLI option parsing works by filling
// in a agent/config.Config struct. Along the way when converting to pointers to
// structs I had to add a call to that function to un-nil various pointers to prevent
// the CLI from segfaulting. However this un-nil operation was causing the various
// enterprise only keys to be materialized. Thus we were back to where we were before
// the conversion to pointers to structs and mostly stuck.
//
// Therefore, this function will create a map[string]interface{} that should be
// compatible with the agent/config.Config struct but where we can more tightly
// control which fields are output. Its not a nice solution. It has a non-trivial
// maintenance burden. In the long run we should unify the protobuf Config and
// the normal agent/config.Config so that we can just serialize the protobuf version
// without any translation. For now, this hack is necessary :(
func translateConfig(c *pbconfig.Config) map[string]interface{} {
out := map[string]interface{}{
"datacenter": c.Datacenter,
"primary_datacenter": c.PrimaryDatacenter,
"node_name": c.NodeName,
}
// only output the SegmentName in the configuration if its non-empty
// this will avoid a warning later when parsing the persisted configuration
if c.SegmentName != "" {
out["segment"] = c.SegmentName
}
// Translate Auto Encrypt settings
if a := c.AutoEncrypt; a != nil {
autoEncryptConfig := map[string]interface{}{
"tls": a.TLS,
"allow_tls": a.AllowTLS,
}
if len(a.DNSSAN) > 0 {
autoEncryptConfig["dns_san"] = a.DNSSAN
}
if len(a.IPSAN) > 0 {
autoEncryptConfig["ip_san"] = a.IPSAN
}
out["auto_encrypt"] = autoEncryptConfig
}
// Translate all the ACL settings
if a := c.ACL; a != nil {
aclConfig := map[string]interface{}{
"enabled": a.Enabled,
"policy_ttl": a.PolicyTTL,
"role_ttl": a.RoleTTL,
"token_ttl": a.TokenTTL,
"down_policy": a.DownPolicy,
"default_policy": a.DefaultPolicy,
"enable_key_list_policy": a.EnableKeyListPolicy,
"disabled_ttl": a.DisabledTTL,
"enable_token_persistence": a.EnableTokenPersistence,
}
if t := c.ACL.Tokens; t != nil {
var mspTokens []map[string]string
// create the slice of msp tokens if any
for _, mspToken := range t.ManagedServiceProvider {
mspTokens = append(mspTokens, map[string]string{
"accessor_id": mspToken.AccessorID,
"secret_id": mspToken.SecretID,
})
}
tokenConfig := make(map[string]interface{})
if t.Master != "" {
tokenConfig["master"] = t.Master
}
if t.Replication != "" {
tokenConfig["replication"] = t.Replication
}
if t.AgentMaster != "" {
tokenConfig["agent_master"] = t.AgentMaster
}
if t.Default != "" {
tokenConfig["default"] = t.Default
}
if t.Agent != "" {
tokenConfig["agent"] = t.Agent
}
if len(mspTokens) > 0 {
tokenConfig["managed_service_provider"] = mspTokens
}
aclConfig["tokens"] = tokenConfig
}
out["acl"] = aclConfig
}
// Translate the Gossip settings
if g := c.Gossip; g != nil {
out["retry_join"] = g.RetryJoinLAN
// Translate the Gossip Encryption settings
if e := c.Gossip.Encryption; e != nil {
out["encrypt"] = e.Key
out["encrypt_verify_incoming"] = e.VerifyIncoming
out["encrypt_verify_outgoing"] = e.VerifyOutgoing
}
}
// Translate the Generic TLS settings
if t := c.TLS; t != nil {
out["verify_outgoing"] = t.VerifyOutgoing
out["verify_server_hostname"] = t.VerifyServerHostname
if t.MinVersion != "" {
out["tls_min_version"] = t.MinVersion
}
if t.CipherSuites != "" {
out["tls_cipher_suites"] = t.CipherSuites
}
out["tls_prefer_server_cipher_suites"] = t.PreferServerCipherSuites
}
return out
}