Skip to content

Commit

Permalink
genpolicy: fix validation of env variables sourced from metadata.name…
Browse files Browse the repository at this point in the history 
…space

Use $(sandbox-namespace) wildcard in case none is specified in yaml. If wildcard is present, compare
input against annotation value.

Fixes regression introduced in #273
where samples that use metadata.namespace env var were no longer working.

Signed-off-by: Saul Paredes <[email protected]>
  • Loading branch information
@Redent0r
Redent0r committed Jan 16, 2025
1 parent 02add57 commit 2ed72c1
Show file tree
Hide file tree
Showing 2 changed files with 34 additions and 17 deletions.
43 changes: 27 additions & 16 deletions src/tools/genpolicy/rules.rego
View file
Original file line number Diff line number Diff line change
Expand Up @@ -251,19 +251,20 @@ allow_by_anno(p_oci, i_oci, p_storages, i_storages) {
print("allow_by_anno 2: i_s_name =", i_s_name, "p_s_name =", p_s_name)

allow_sandbox_name(p_s_name, i_s_name)
allow_by_sandbox_name(p_oci, i_oci, p_storages, i_storages, i_s_name)
i_s_namespace := i_oci.Annotations[S_NAMESPACE_KEY]
allow_by_sandbox_name(p_oci, i_oci, p_storages, i_storages, i_s_name, i_s_namespace)

print("allow_by_anno 2: true")
}

allow_by_sandbox_name(p_oci, i_oci, p_storages, i_storages, s_name) {
allow_by_sandbox_name(p_oci, i_oci, p_storages, i_storages, s_name, s_namespace) {
print("allow_by_sandbox_name: start")

i_namespace := i_oci.Annotations[S_NAMESPACE_KEY]

allow_by_container_types(p_oci, i_oci, s_name, i_namespace)
allow_by_bundle_or_sandbox_id(p_oci, i_oci, p_storages, i_storages)
allow_process(p_oci.Process, i_oci.Process, s_name)
allow_process(p_oci.Process, i_oci.Process, s_name, s_namespace)

print("allow_by_sandbox_name: true")
}
Expand Down Expand Up @@ -557,7 +558,7 @@ allow_by_bundle_or_sandbox_id(p_oci, i_oci, p_storages, i_storages) {
print("allow_by_bundle_or_sandbox_id: true")
}

allow_process_common(p_process, i_process, s_name) {
allow_process_common(p_process, i_process, s_name, s_namespace) {
print("allow_process_common: p_process =", p_process)
print("allow_process_common: i_process = ", i_process)
print("allow_process_common: s_name =", s_name)
Expand All @@ -566,17 +567,17 @@ allow_process_common(p_process, i_process, s_name) {
p_process.NoNewPrivileges == i_process.NoNewPrivileges

allow_user(p_process, i_process)
allow_env(p_process, i_process, s_name)
allow_env(p_process, i_process, s_name, s_namespace)

print("allow_process_common: true")
}

# Compare the OCI Process field of a policy container with the input OCI Process from a CreateContainerRequest
allow_process(p_process, i_process, s_name) {
allow_process(p_process, i_process, s_name, s_namespace) {
print("allow_process: start")

allow_args(p_process, i_process, s_name)
allow_process_common(p_process, i_process, s_name)
allow_process_common(p_process, i_process, s_name, s_namespace)
allow_caps(p_process.Capabilities, i_process.Capabilities)
p_process.Terminal == i_process.Terminal

Expand Down Expand Up @@ -675,27 +676,27 @@ allow_arg(i, i_arg, p_process, s_name) {
}

# OCI process.Env field
allow_env(p_process, i_process, s_name) {
allow_env(p_process, i_process, s_name, s_namespace) {
print("allow_env: p env =", p_process.Env)
print("allow_env: i env =", i_process.Env)

every i_var in i_process.Env {
print("allow_env: i_var =", i_var)
allow_var(p_process, i_process, i_var, s_name)
allow_var(p_process, i_process, i_var, s_name, s_namespace)
}

print("allow_env: true")
}

# Allow input env variables that are present in the policy data too.
allow_var(p_process, i_process, i_var, s_name) {
allow_var(p_process, i_process, i_var, s_name, s_namespace) {
some p_var in p_process.Env
p_var == i_var
print("allow_var 1: true")
}

# Match input with one of the policy variables, after substituting $(sandbox-name).
allow_var(p_process, i_process, i_var, s_name) {
allow_var(p_process, i_process, i_var, s_name, s_namespace) {
some p_var in p_process.Env
p_var2 := replace(p_var, "$(sandbox-name)", s_name)

Expand All @@ -706,7 +707,7 @@ allow_var(p_process, i_process, i_var, s_name) {
}

# Allow input env variables that match with a request_defaults regex.
allow_var(p_process, i_process, i_var, s_name) {
allow_var(p_process, i_process, i_var, s_name, s_namespace) {
some p_regex1 in policy_data.request_defaults.CreateContainerRequest.allow_env_regex
p_regex2 := replace(p_regex1, "$(ipv4_a)", policy_data.common.ipv4_a)
p_regex3 := replace(p_regex2, "$(ip_p)", policy_data.common.ip_p)
Expand All @@ -720,7 +721,7 @@ allow_var(p_process, i_process, i_var, s_name) {
}

# Allow fieldRef "fieldPath: status.podIP" values.
allow_var(p_process, i_process, i_var, s_name) {
allow_var(p_process, i_process, i_var, s_name, s_namespace) {
name_value := split(i_var, "=")
count(name_value) == 2
is_ip(name_value[1])
Expand All @@ -731,8 +732,18 @@ allow_var(p_process, i_process, i_var, s_name) {
print("allow_var 4: true")
}

allow_var(p_process, i_process, i_var, s_name, s_namespace) {
some p_var in p_process.Env
p_var2 := replace(p_var, "$(sandbox-namespace)", s_namespace)

print("allow_var 5: p_var5 =", p_var2)
p_var2 == i_var

print("allow_var 5: true")
}

# Allow common fieldRef variables.
allow_var(p_process, i_process, i_var, s_name) {
allow_var(p_process, i_process, i_var, s_name, s_namespace) {
name_value := split(i_var, "=")
count(name_value) == 2

Expand All @@ -751,7 +762,7 @@ allow_var(p_process, i_process, i_var, s_name) {
}

# Allow fieldRef "fieldPath: status.hostIP" values.
allow_var(p_process, i_process, i_var, s_name) {
allow_var(p_process, i_process, i_var, s_name, s_namespace) {
name_value := split(i_var, "=")
count(name_value) == 2
is_ip(name_value[1])
Expand All @@ -763,7 +774,7 @@ allow_var(p_process, i_process, i_var, s_name) {
}

# Allow resourceFieldRef values (e.g., "limits.cpu").
allow_var(p_process, i_process, i_var, s_name) {
allow_var(p_process, i_process, i_var, s_name, s_namespace) {
name_value := split(i_var, "=")
count(name_value) == 2

Expand Down
8 changes: 7 additions & 1 deletion src/tools/genpolicy/src/pod.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -748,7 +748,13 @@ impl EnvVar {
let path: &str = &field_ref.fieldPath;
match path {
"metadata.name" => return "$(sandbox-name)".to_string(),
"metadata.namespace" => return namespace.to_string(),
"metadata.namespace" => {
return if namespace.is_empty() {
"$(sandbox-namespace)".to_string()
} else {
namespace.to_string()
};
}
"metadata.uid" => return "$(pod-uid)".to_string(),
"status.hostIP" => return "$(host-ip)".to_string(),
"status.podIP" => return "$(pod-ip)".to_string(),
Expand Down

0 comments on commit 2ed72c1

Please sign in to comment.