resource "aws_glacier_vault" "my_archive1" {
  ...
  access_policy = <<EOF
{
    "Version":"2012-10-17",
    "Statement":[
       {
          "Sid": "add-read-only-perm",
          "Principal": "*",
       +  "Effect": "Deny",
          "Action": [
             "glacier:InitiateJob",
             "glacier:GetJobOutput"
          ],
          "Resource": "arn:aws:glacier:eu-west-1:432981146916:vaults/MyArchive"
       }
    ]
    }
}