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Mrunal Patel
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Merge pull request #675 from crosbymichael/caps
Add ambient and bounding capability support
2 parents 8c22b69 + eb114f0 commit ac9f8e0

4 files changed

Lines changed: 110 additions & 17 deletions

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‎config.md‎

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@@ -132,7 +132,13 @@ For Windows, see links for details about [mountvol](http://ss64.com/nt/mountvol.
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* **`env`** (array of strings, OPTIONAL) with the same semantics as [IEEE Std 1003.1-2001's `environ`][ieee-1003.1-2001-xbd-c8.1].
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* **`args`** (array of strings, REQUIRED) with similar semantics to [IEEE Std 1003.1-2001 `execvp`'s *argv*][ieee-1003.1-2001-xsh-exec].
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This specification extends the IEEE standard in that at least one entry is REQUIRED, and that entry is used with the same semantics as `execvp`'s *file*.
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* **`capabilities`** (array of strings, OPTIONAL) is an array that specifies the set of capabilities of the process(es) inside the container. Valid values are platform-specific. For example, valid values for Linux are defined in the [CAPABILITIES(7)](http://man7.org/linux/man-pages/man7/capabilities.7.html) man page.
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* **`capabilities`** (object, OPTIONAL) is an object containing arrays that specifies the sets of capabilities for the process(es) inside the container. Valid values are platform-specific. For example, valid values for Linux are defined in the [CAPABILITIES(7)](http://man7.org/linux/man-pages/man7/capabilities.7.html) man page.
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capabilities contains the following properties:
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* **`effective`** (array of strings, OPTIONAL) - the `effective` field is an array of effective capabilities that are kept for the process.
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* **`bounding`** (array of strings, OPTIONAL) - the `bounding` field is an array of bounding capabilities that are kept for the process.
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* **`inheritable`** (array of strings, OPTIONAL) - the `inheritable` field is an array of inheritable capabilities that are kept for the process.
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* **`permitted`** (array of strings, OPTIONAL) - the `permitted` field is an array of permitted capabilities that are kept for the process.
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* **`ambient`** (array of strings, OPTIONAL) - the `ambient` field is an array of ambient capabilities that are kept for the process.
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* **`rlimits`** (array of objects, OPTIONAL) allows setting resource limits for a process inside the container.
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Each entry has the following structure:
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@@ -191,11 +197,30 @@ _Note: symbolic name for uid and gid, such as uname and gname respectively, are
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"apparmorProfile": "acme_secure_profile",
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"selinuxLabel": "system_u:system_r:svirt_lxc_net_t:s0:c124,c675",
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"noNewPrivileges": true,
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"capabilities": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"capabilities": {
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"bounding": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"permitted": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"inheritable": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"effective": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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],
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"ambient": [
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"CAP_NET_BIND_SERVICE"
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]
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},
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"rlimits": [
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{
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"type": "RLIMIT_NOFILE",
@@ -446,11 +471,30 @@ Here is a full example `config.json` for reference.
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"TERM=xterm"
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],
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"cwd": "/",
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"capabilities": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"capabilities": {
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"bounding": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"permitted": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"inheritable": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE"
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],
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"effective": [
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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],
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"ambient": [
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"CAP_NET_BIND_SERVICE"
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]
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},
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"rlimits": [
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{
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"type": "RLIMIT_CORE",

‎schema/config-schema.json‎

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@@ -135,9 +135,43 @@
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},
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"capabilities": {
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"id": "https://opencontainers.org/schema/bundle/process/linux/capabilities",
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"type": "array",
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"items": {
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"$ref": "defs-linux.json#/definitions/Capability"
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"type": "object",
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"properties": {
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"bounding": {
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"id": "https://opencontainers.org/schema/bundle/process/linux/capabilities/bounding",
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"type": "array",
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"items": {
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"$ref": "defs-linux.json#/definitions/Capability"
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}
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},
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"permitted": {
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"id": "https://opencontainers.org/schema/bundle/process/linux/capabilities/permitted",
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"type": "array",
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"items": {
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"$ref": "defs-linux.json#/definitions/Capability"
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}
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},
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"effective": {
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"id": "https://opencontainers.org/schema/bundle/process/linux/capabilities/effective",
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"type": "array",
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"items": {
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"$ref": "defs-linux.json#/definitions/Capability"
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}
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},
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"inheritable": {
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"id": "https://opencontainers.org/schema/bundle/process/linux/capabilities/inheritable",
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"type": "array",
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"items": {
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"$ref": "defs-linux.json#/definitions/Capability"
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}
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},
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"ambient": {
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"id": "https://opencontainers.org/schema/bundle/process/linux/capabilities/ambient",
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"type": "array",
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"items": {
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"$ref": "defs-linux.json#/definitions/Capability"
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}
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}
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}
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},
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"apparmorProfile": {

‎schema/defs-linux.json‎

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@@ -78,7 +78,7 @@
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}
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},
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"Capability": {
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"description": "Linux process permissions",
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"description": "Linux process capabilities",
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"type": "string",
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"pattern": "^CAP_([A-Z]|_)+$"
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},

‎specs-go/config.go‎

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@@ -44,8 +44,8 @@ type Process struct {
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// Cwd is the current working directory for the process and must be
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// relative to the container's root.
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Cwd string `json:"cwd"`
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// Capabilities are Linux capabilities that are kept for the container.
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Capabilities []string `json:"capabilities,omitempty" platform:"linux"`
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// Capabilities are Linux capabilities that are kept for the process.
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Capabilities *LinuxCapabilities `json:"capabilities,omitempty" platform:"linux"`
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// Rlimits specifies rlimit options to apply to the process.
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Rlimits []LinuxRlimit `json:"rlimits,omitempty" platform:"linux"`
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// NoNewPrivileges controls whether additional privileges could be gained by processes in the container.
@@ -56,6 +56,21 @@ type Process struct {
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SelinuxLabel string `json:"selinuxLabel,omitempty" platform:"linux"`
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}
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// LinuxCapabilities specifies the whitelist of capabilities that are kept for a process.
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// http://man7.org/linux/man-pages/man7/capabilities.7.html
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type LinuxCapabilities struct {
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// Bounding is the set of capabilities checked by the kernel.
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Bounding []string `json:"bounding,omitempty" platform:"linux"`
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// Effective is the set of capabilities checked by the kernel.
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Effective []string `json:"effective,omitempty" platform:"linux"`
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// Inheritable is the capabilities preserved across execve.
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Inheritable []string `json:"inheritable,omitempty" platform:"linux"`
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// Permitted is the limiting superset for effective capabilities.
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Permitted []string `json:"permitted,omitempty" platform:"linux"`
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// Ambient is the ambient set of capabilities that are kept.
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Ambient []string `json:"ambient,omitempty" platform:"linux"`
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}
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// Box specifies dimensions of a rectangle. Used for specifying the size of a console.
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type Box struct {
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// Height is the vertical dimension of a box.

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