Solution

main.tf

@@ -1,3 +1,43 @@
 # 1. Deploy an S3 storage bucket 
-
+resource "aws_s3_bucket" "mate-grafana-bucket" {
+  bucket = "mate-grafana-bucket"
+}
 # 2. Confugure bucket policy to allow grafana iam role to use storage 
+resource "aws_s3_bucket_policy" "mate-grafana-backups-policy" {
+  bucket = aws_s3_bucket.mate-grafana-bucket.id
+  policy = data.aws_iam_policy_document.allow_access_from_another_account.json
+}
+
+data "aws_iam_policy_document" "allow_access_from_another_account" {
+  statement {
+    principals {
+      type        = "AWS"
+      identifiers = [var.grafana_iam_role_arn]
+    }
+
+    actions = [
+      "s3:ListBucket",
+    ]
+
+    resources = [
+      aws_s3_bucket.mate-grafana-bucket.arn
+    ]
+  }
+
+  statement {
+    principals {
+      type        = "AWS"
+      identifiers = [var.grafana_iam_role_arn]
+    }
+
+    actions = [
+      "s3:GetObject",
+      "s3:PutObject"
+    ]
+
+    resources = [
+      aws_s3_bucket.mate-grafana-bucket.arn,
+      "${aws_s3_bucket.mate-grafana-bucket.arn}/*",
+    ]
+  }
+}

outputs.tf

@@ -1,4 +1,4 @@
 output "bucket_name" {
-    value = aws_s3_bucket.grafana_backups.bucket
+    value = aws_s3_bucket.mate-grafana-bucket.bucket
     sensitive = false
 }

terraform.tfvars

@@ -1 +1 @@
-grafana_iam_role_arn = ""
+grafana_iam_role_arn = "arn:aws:iam::884337373875:role/mate-role"

tfplan.json

@@ -0,0 +1 @@
+{"format_version":"1.2","terraform_version":"1.13.3","variables":{"grafana_iam_role_arn":{"value":"arn:aws:iam::884337373875:role/mate-role"}},"planned_values":{"outputs":{"bucket_name":{"sensitive":false,"type":"string","value":"mate-grafana-bucket"}},"root_module":{"resources":[{"address":"aws_s3_bucket.mate-grafana-bucket","mode":"managed","type":"aws_s3_bucket","name":"mate-grafana-bucket","provider_name":"registry.terraform.io/hashicorp/aws","schema_version":0,"values":{"bucket":"mate-grafana-bucket","force_destroy":false,"tags":null,"timeouts":null},"sensitive_values":{"cors_rule":[],"grant":[],"lifecycle_rule":[],"logging":[],"object_lock_configuration":[],"replication_configuration":[],"server_side_encryption_configuration":[],"tags_all":{},"versioning":[],"website":[]}},{"address":"aws_s3_bucket_policy.mate-grafana-backups-policy","mode":"managed","type":"aws_s3_bucket_policy","name":"mate-grafana-backups-policy","provider_name":"registry.terraform.io/hashicorp/aws","schema_version":0,"sensitive_values":{}},{"address":"data.aws_iam_policy_document.allow_access_from_another_account","mode":"data","type":"aws_iam_policy_document","name":"allow_access_from_another_account","provider_name":"registry.terraform.io/hashicorp/aws","schema_version":0,"values":{"override_json":null,"override_policy_documents":null,"policy_id":null,"source_json":null,"source_policy_documents":null,"statement":[{"actions":["s3:ListBucket"],"condition":[],"effect":null,"not_actions":null,"not_principals":[],"not_resources":null,"principals":[{"identifiers":["arn:aws:iam::884337373875:role/mate-role"],"type":"AWS"}],"resources":[null],"sid":null},{"actions":["s3:GetObject","s3:PutObject"],"condition":[],"effect":null,"not_actions":null,"not_principals":[],"not_resources":null,"principals":[{"identifiers":["arn:aws:iam::884337373875:role/mate-role"],"type":"AWS"}],"resources":[null,null],"sid":null}],"version":null},"sensitive_values":{"statement":[{"actions":[false],"condition":[],"not_principals":[],"principals":[{"identifiers":[false]}],"resources":[false]},{"actions":[false,false],"condition":[],"not_principals":[],"principals":[{"identifiers":[false]}],"resources":[false,false]}]}}]}},"resource_changes":[{"address":"data.aws_iam_policy_document.allow_access_from_another_account","mode":"data","type":"aws_iam_policy_document","name":"allow_access_from_another_account","provider_name":"registry.terraform.io/hashicorp/aws","change":{"actions":["read"],"before":null,"after":{"override_json":null,"override_policy_documents":null,"policy_id":null,"source_json":null,"source_policy_documents":null,"statement":[{"actions":["s3:ListBucket"],"condition":[],"effect":null,"not_actions":null,"not_principals":[],"not_resources":null,"principals":[{"identifiers":["arn:aws:iam::884337373875:role/mate-role"],"type":"AWS"}],"resources":[null],"sid":null},{"actions":["s3:GetObject","s3:PutObject"],"condition":[],"effect":null,"not_actions":null,"not_principals":[],"not_resources":null,"principals":[{"identifiers":["arn:aws:iam::884337373875:role/mate-role"],"type":"AWS"}],"resources":[null,null],"sid":null}],"version":null},"after_unknown":{"id":true,"json":true,"minified_json":true,"statement":[{"actions":[false],"condition":[],"not_principals":[],"principals":[{"identifiers":[false]}],"resources":[true]},{"actions":[false,false],"condition":[],"not_principals":[],"principals":[{"identifiers":[false]}],"resources":[true,true]}]},"before_sensitive":false,"after_sensitive":{"statement":[{"actions":[false],"condition":[],"not_principals":[],"principals":[{"identifiers":[false]}],"resources":[false]},{"actions":[false,false],"condition":[],"not_principals":[],"principals":[{"identifiers":[false]}],"resources":[false,false]}]}},"action_reason":"read_because_config_unknown"},{"address":"aws_s3_bucket.mate-grafana-bucket","mode":"managed","type":"aws_s3_bucket","name":"mate-grafana-bucket","provider_name":"registry.terraform.io/hashicorp/aws","change":{"actions":["create"],"before":null,"after":{"bucket":"mate-grafana-bucket","force_destroy":false,"tags":null,"timeouts":null},"after_unknown":{"acceleration_status":true,"acl":true,"arn":true,"bucket_domain_name":true,"bucket_prefix":true,"bucket_regional_domain_name":true,"cors_rule":true,"grant":true,"hosted_zone_id":true,"id":true,"lifecycle_rule":true,"logging":true,"object_lock_configuration":true,"object_lock_enabled":true,"policy":true,"region":true,"replication_configuration":true,"request_payer":true,"server_side_encryption_configuration":true,"tags_all":true,"versioning":true,"website":true,"website_domain":true,"website_endpoint":true},"before_sensitive":false,"after_sensitive":{"cors_rule":[],"grant":[],"lifecycle_rule":[],"logging":[],"object_lock_configuration":[],"replication_configuration":[],"server_side_encryption_configuration":[],"tags_all":{},"versioning":[],"website":[]}}},{"address":"aws_s3_bucket_policy.mate-grafana-backups-policy","mode":"managed","type":"aws_s3_bucket_policy","name":"mate-grafana-backups-policy","provider_name":"registry.terraform.io/hashicorp/aws","change":{"actions":["create"],"before":null,"after":{},"after_unknown":{"bucket":true,"id":true,"policy":true},"before_sensitive":false,"after_sensitive":{}}}],"output_changes":{"bucket_name":{"actions":["update"],"before":"mate-bucket","after":"mate-grafana-bucket","after_unknown":false,"before_sensitive":false,"after_sensitive":false}},"prior_state":{"format_version":"1.0","terraform_version":"1.13.3","values":{"outputs":{"bucket_name":{"sensitive":false,"value":"mate-grafana-bucket","type":"string"}},"root_module":{}}},"configuration":{"provider_config":{"aws":{"name":"aws","full_name":"registry.terraform.io/hashicorp/aws","version_constraint":"~\u003e 5.0"}},"root_module":{"outputs":{"bucket_name":{"expression":{"references":["aws_s3_bucket.mate-grafana-bucket.bucket","aws_s3_bucket.mate-grafana-bucket"]}}},"resources":[{"address":"aws_s3_bucket.mate-grafana-bucket","mode":"managed","type":"aws_s3_bucket","name":"mate-grafana-bucket","provider_config_key":"aws","expressions":{"bucket":{"constant_value":"mate-grafana-bucket"}},"schema_version":0},{"address":"aws_s3_bucket_policy.mate-grafana-backups-policy","mode":"managed","type":"aws_s3_bucket_policy","name":"mate-grafana-backups-policy","provider_config_key":"aws","expressions":{"bucket":{"references":["aws_s3_bucket.mate-grafana-bucket.id","aws_s3_bucket.mate-grafana-bucket"]},"policy":{"references":["data.aws_iam_policy_document.allow_access_from_another_account.json","data.aws_iam_policy_document.allow_access_from_another_account"]}},"schema_version":0},{"address":"data.aws_iam_policy_document.allow_access_from_another_account","mode":"data","type":"aws_iam_policy_document","name":"allow_access_from_another_account","provider_config_key":"aws","expressions":{"statement":[{"actions":{"constant_value":["s3:ListBucket"]},"principals":[{"identifiers":{"references":["var.grafana_iam_role_arn"]},"type":{"constant_value":"AWS"}}],"resources":{"references":["aws_s3_bucket.mate-grafana-bucket.arn","aws_s3_bucket.mate-grafana-bucket"]}},{"actions":{"constant_value":["s3:GetObject","s3:PutObject"]},"principals":[{"identifiers":{"references":["var.grafana_iam_role_arn"]},"type":{"constant_value":"AWS"}}],"resources":{"references":["aws_s3_bucket.mate-grafana-bucket.arn","aws_s3_bucket.mate-grafana-bucket","aws_s3_bucket.mate-grafana-bucket.arn","aws_s3_bucket.mate-grafana-bucket"]}}]},"schema_version":0}],"variables":{"grafana_iam_role_arn":{}}}},"relevant_attributes":[{"resource":"data.aws_iam_policy_document.allow_access_from_another_account","attribute":["json"]},{"resource":"aws_s3_bucket.mate-grafana-bucket","attribute":["arn"]},{"resource":"aws_s3_bucket.mate-grafana-bucket","attribute":["bucket"]},{"resource":"aws_s3_bucket.mate-grafana-bucket","attribute":["id"]}],"timestamp":"2025-10-03T17:18:22Z","applyable":true,"complete":true,"errored":false}