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Limit permissions to TXT only

martgras 2018-03-26 12:12:39 +02:00
parent 575af337db
commit a7754436a2
1 changed files with 42 additions and 2 deletions
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44
How-to-use-Azure-DNS.md

@ -86,11 +86,51 @@ or grant access to the service principal after you created it
az role assignment create --assignee 3b5033b5-7a66-43a5-b3b9-a36b9e7c25ed --role "DNS Zone Contributor" --scope /subscriptions/12345678-9abc-def0-1234-567890abcdef/resourceGroups/deleteme_rg/providers/Microsoft.Network/dnszones/example.edu
```
\*If you want to use different credentials instead use the --accountconf to use a different configuration file
#### You can now use acme.sh
### Limit access permissions to TXT records
In Azure DNS you can limit the permissions for the service principal further and only grant permissions to modifiy TXT records for a given DNS Zone.
(See https://docs.microsoft.com/en-us/azure/dns/dns-protect-zones-recordsets for more details)
Example:
* Azure Subscription is 12345678-9abc-def0-1234-567890abcdef
* The resource group of your DNS Zone is exampledns_rg
* The DNS Zone is example.com
```sh
#!/usr/bin/env sh
# Create a custom RBAC role that grants permissions to modifiy only TXT records
dnscustomrole='{
"Name": "DNS TXT Contributor",
"Id": "",
"IsCustom": true,
"Description": "Can manage DNS TXT records only.",
"Actions": [
"Microsoft.Network/dnsZones/TXT/*",
"Microsoft.Network/dnsZones/read",
"Microsoft.Authorization/*/read",
"Microsoft.Insights/alertRules/*",
"Microsoft.ResourceHealth/availabilityStatuses/read",
"Microsoft.Resources/deployments/read",
"Microsoft.Resources/subscriptions/resourceGroups/read"
],
"NotActions": [
],
"AssignableScopes": [
"/subscriptions/12345678-9abc-def0-1234-567890abcdef"
]
}'
az role definition create --role-definition "$dnscustomrole"
# Create a new service principal and grant permissions to modify TXT recornds in the give DNS Zone
az ad sp create-for-rbac --name "AcmeDnsValidator" --role "DNS TXT Contributor" --scopes "/subscriptions/12345678-9abc-def0-1234-567890abcdef/resourceGroups/exampledns_rg/providers/Microsoft.Network/dnszones/example.com
# or grant and exitisng service principal permissions to modify TXT recornds in the give DNS Zone
#az role assignment create --assignee 3b5033b5-7a66-43a5-b3b9-a36b9e7c25ed --scope "/subscriptions/12345678-9abc-def0-1234-567890abcdef/resourceGroups/exampledns_rg/providers/Microsoft.Network/dnszones/example.com" --role "DNS TXT Contributor"
```
#### You can now use acme.sh
```
export AZUREDNS_SUBSCRIPTIONID="12345678-9abc-def0-1234-567890abcdef"