598 lines
22 KiB
Go
598 lines
22 KiB
Go
package ssh
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import (
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"fmt"
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"strings"
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"time"
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"github.com/hashicorp/vault/helper/cidrutil"
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"github.com/hashicorp/vault/helper/duration"
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"github.com/hashicorp/vault/logical"
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"github.com/hashicorp/vault/logical/framework"
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)
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const (
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KeyTypeOTP = "otp"
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KeyTypeDynamic = "dynamic"
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KeyTypeCA = "ca"
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)
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// Structure that represents a role in SSH backend. This is a common role structure
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// for both OTP and Dynamic roles. Not all the fields are mandatory for both type.
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// Some are applicable for one and not for other. It doesn't matter.
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type sshRole struct {
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KeyType string `mapstructure:"key_type" json:"key_type"`
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KeyName string `mapstructure:"key" json:"key"`
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KeyBits int `mapstructure:"key_bits" json:"key_bits"`
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AdminUser string `mapstructure:"admin_user" json:"admin_user"`
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DefaultUser string `mapstructure:"default_user" json:"default_user"`
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CIDRList string `mapstructure:"cidr_list" json:"cidr_list"`
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ExcludeCIDRList string `mapstructure:"exclude_cidr_list" json:"exclude_cidr_list"`
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Port int `mapstructure:"port" json:"port"`
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InstallScript string `mapstructure:"install_script" json:"install_script"`
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AllowedUsers string `mapstructure:"allowed_users" json:"allowed_users"`
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AllowedDomains string `mapstructure:"allowed_domains" json:"allowed_domains"`
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KeyOptionSpecs string `mapstructure:"key_option_specs" json:"key_option_specs"`
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MaxTTL string `mapstructure:"max_ttl" json:"max_ttl"`
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TTL string `mapstructure:"ttl" json:"ttl"`
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DefaultCriticalOptions map[string]string `mapstructure:"default_critical_options" json:"default_critical_options"`
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DefaultExtensions map[string]string `mapstructure:"default_extensions" json:"default_extensions"`
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AllowedCriticalOptions string `mapstructure:"allowed_critical_options" json:"allowed_critical_options"`
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AllowedExtensions string `mapstructure:"allowed_extensions" json:"allowed_extensions"`
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AllowUserCertificates bool `mapstructure:"allow_user_certificates" json:"allow_user_certificates"`
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AllowHostCertificates bool `mapstructure:"allow_host_certificates" json:"allow_host_certificates"`
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AllowBareDomains bool `mapstructure:"allow_bare_domains" json:"allow_bare_domains"`
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AllowSubdomains bool `mapstructure:"allow_subdomains" json:"allow_subdomains"`
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}
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func pathListRoles(b *backend) *framework.Path {
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return &framework.Path{
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Pattern: "roles/?$",
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Callbacks: map[logical.Operation]framework.OperationFunc{
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logical.ListOperation: b.pathRoleList,
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},
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HelpSynopsis: pathRoleHelpSyn,
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HelpDescription: pathRoleHelpDesc,
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}
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}
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func pathRoles(b *backend) *framework.Path {
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return &framework.Path{
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Pattern: "roles/" + framework.GenericNameRegex("role"),
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Fields: map[string]*framework.FieldSchema{
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"role": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Required for all types]
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Name of the role being created.`,
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},
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"key": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Required for Dynamic type] [Not applicable for OTP type] [Not applicable for CA type]
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Name of the registered key in Vault. Before creating the role, use the
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'keys/' endpoint to create a named key.`,
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},
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"admin_user": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Required for Dynamic type] [Not applicable for OTP type] [Not applicable for CA type]
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Admin user at remote host. The shared key being registered should be
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for this user and should have root privileges. Everytime a dynamic
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credential is being generated for other users, Vault uses this admin
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username to login to remote host and install the generated credential
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for the other user.`,
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},
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"default_user": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Required for Dynamic type] [Required for OTP type] [Optional for CA type]
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Default username for which a credential will be generated.
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When the endpoint 'creds/' is used without a username, this
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value will be used as default username.`,
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},
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"cidr_list": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Optional for Dynamic type] [Optional for OTP type] [Not applicable for CA type]
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Comma separated list of CIDR blocks for which the role is applicable for.
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CIDR blocks can belong to more than one role.`,
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},
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"exclude_cidr_list": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Optional for Dynamic type] [Optional for OTP type] [Not applicable for CA type]
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Comma separated list of CIDR blocks. IP addresses belonging to these blocks are not
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accepted by the role. This is particularly useful when big CIDR blocks are being used
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by the role and certain parts of it needs to be kept out.`,
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},
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"port": &framework.FieldSchema{
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Type: framework.TypeInt,
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Description: `
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[Optional for Dynamic type] [Optional for OTP type] [Not applicable for CA type]
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Port number for SSH connection. Default is '22'. Port number does not
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play any role in creation of OTP. For 'otp' type, this is just a way
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to inform client about the port number to use. Port number will be
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returned to client by Vault server along with OTP.`,
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},
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"key_type": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Required for all types]
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Type of key used to login to hosts. It can be either 'otp', 'dynamic' or 'ca'.
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'otp' type requires agent to be installed in remote hosts.`,
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},
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"key_bits": &framework.FieldSchema{
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Type: framework.TypeInt,
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Description: `
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[Optional for Dynamic type] [Not applicable for OTP type] [Not applicable for CA type]
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Length of the RSA dynamic key in bits. It is 1024 by default or it can be 2048.`,
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},
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"install_script": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Optional for Dynamic type] [Not-applicable for OTP type] [Not applicable for CA type]
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Script used to install and uninstall public keys in the target machine.
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The inbuilt default install script will be for Linux hosts. For sample
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script, refer the project documentation website.`,
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},
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"allowed_users": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Optional for all types]
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If this option is not specified, client can request for a credential for
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any valid user at the remote host, including the admin user. If only certain
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usernames are to be allowed, then this list enforces it. If this field is
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set, then credentials can only be created for default_user and usernames
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present in this list.
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`,
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},
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"allowed_domains": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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If this option is not specified, client can request for a signed certificate for any
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valid host. If only certain domains are allowed, then this list enforces it.
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`,
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},
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"key_option_specs": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Optional for Dynamic type] [Not applicable for OTP type] [Not applicable for CA type]
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Comma separated option specifications which will be prefixed to RSA key in
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authorized_keys file. Options should be valid and comply with authorized_keys
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file format and should not contain spaces.
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`,
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},
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"ttl": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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The lease duration if no specific lease duration is
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requested. The lease duration controls the expiration
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of certificates issued by this backend. Defaults to
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the value of max_ttl.`,
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},
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"max_ttl": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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The maximum allowed lease duration
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`,
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},
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"allowed_critical_options": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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A comma-separated list of critical options that certificates can have when signed.
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To allow any critical options, set this to an empty string.
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`,
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},
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"allowed_extensions": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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A comma-separated list of extensions that certificates can have when signed.
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To allow any extensions, set this to an empty string.
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`,
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},
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"default_critical_options": &framework.FieldSchema{
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Type: framework.TypeMap,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type]
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[Optional for CA type] Critical options certificates should
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have if none are provided when signing. This field takes in key
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value pairs in JSON format. Note that these are not restricted
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by "allowed_critical_options". Defaults to none.
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`,
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},
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"default_extensions": &framework.FieldSchema{
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Type: framework.TypeMap,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type]
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[Optional for CA type] Extensions certificates should have if
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none are provided when signing. This field takes in key value
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pairs in JSON format. Note that these are not restricted by
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"allowed_extensions". Defaults to none.
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`,
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},
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"allow_user_certificates": &framework.FieldSchema{
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Type: framework.TypeBool,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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If set, certificates are allowed to be signed for use as a 'user'.
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`,
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Default: false,
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},
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"allow_host_certificates": &framework.FieldSchema{
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Type: framework.TypeBool,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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If set, certificates are allowed to be signed for use as a 'host'.
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`,
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Default: false,
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},
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"allow_bare_domains": &framework.FieldSchema{
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Type: framework.TypeBool,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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If set, host certificates that are requested are allowed to use the base domains listed in
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"allowed_domains", e.g. "example.com".
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This is a separate option as in some cases this can be considered a security threat.
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`,
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},
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"allow_subdomains": &framework.FieldSchema{
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Type: framework.TypeBool,
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Description: `
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[Not applicable for Dynamic type] [Not applicable for OTP type] [Optional for CA type]
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If set, host certificates that are requested are allowed to use subdomains of those listed in "allowed_domains".
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`,
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},
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},
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Callbacks: map[logical.Operation]framework.OperationFunc{
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logical.ReadOperation: b.pathRoleRead,
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logical.UpdateOperation: b.pathRoleWrite,
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logical.DeleteOperation: b.pathRoleDelete,
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},
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HelpSynopsis: pathRoleHelpSyn,
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HelpDescription: pathRoleHelpDesc,
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}
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}
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func (b *backend) pathRoleWrite(req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
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roleName := d.Get("role").(string)
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if roleName == "" {
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return logical.ErrorResponse("missing role name"), nil
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}
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// Allowed users is an optional field, applicable for both OTP and Dynamic types.
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allowedUsers := d.Get("allowed_users").(string)
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// Validate the CIDR blocks
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cidrList := d.Get("cidr_list").(string)
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if cidrList != "" {
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valid, err := cidrutil.ValidateCIDRListString(cidrList, ",")
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if err != nil {
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return nil, fmt.Errorf("failed to validate cidr_list: %v", err)
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}
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if !valid {
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return logical.ErrorResponse("failed to validate cidr_list"), nil
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}
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}
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// Validate the excluded CIDR blocks
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excludeCidrList := d.Get("exclude_cidr_list").(string)
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if excludeCidrList != "" {
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valid, err := cidrutil.ValidateCIDRListString(excludeCidrList, ",")
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if err != nil {
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return nil, fmt.Errorf("failed to validate exclude_cidr_list entry: %v", err)
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}
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if !valid {
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return logical.ErrorResponse(fmt.Sprintf("failed to validate exclude_cidr_list entry: %v", err)), nil
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}
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}
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port := d.Get("port").(int)
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if port == 0 {
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port = 22
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}
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keyType := d.Get("key_type").(string)
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if keyType == "" {
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return logical.ErrorResponse("missing key type"), nil
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}
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keyType = strings.ToLower(keyType)
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var roleEntry sshRole
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if keyType == KeyTypeOTP {
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defaultUser := d.Get("default_user").(string)
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if defaultUser == "" {
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return logical.ErrorResponse("missing default user"), nil
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}
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// Admin user is not used if OTP key type is used because there is
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// no need to login to remote machine.
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adminUser := d.Get("admin_user").(string)
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if adminUser != "" {
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return logical.ErrorResponse("admin user not required for OTP type"), nil
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}
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// Below are the only fields used from the role structure for OTP type.
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roleEntry = sshRole{
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DefaultUser: defaultUser,
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CIDRList: cidrList,
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ExcludeCIDRList: excludeCidrList,
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KeyType: KeyTypeOTP,
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Port: port,
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AllowedUsers: allowedUsers,
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}
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} else if keyType == KeyTypeDynamic {
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defaultUser := d.Get("default_user").(string)
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if defaultUser == "" {
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return logical.ErrorResponse("missing default user"), nil
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}
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// Key name is required by dynamic type and not by OTP type.
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keyName := d.Get("key").(string)
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if keyName == "" {
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return logical.ErrorResponse("missing key name"), nil
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}
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keyEntry, err := req.Storage.Get(fmt.Sprintf("keys/%s", keyName))
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if err != nil || keyEntry == nil {
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return logical.ErrorResponse(fmt.Sprintf("invalid 'key': %q", keyName)), nil
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}
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installScript := d.Get("install_script").(string)
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keyOptionSpecs := d.Get("key_option_specs").(string)
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// Setting the default script here. The script will install the
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// generated public key in the authorized_keys file of linux host.
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if installScript == "" {
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installScript = DefaultPublicKeyInstallScript
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}
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adminUser := d.Get("admin_user").(string)
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if adminUser == "" {
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return logical.ErrorResponse("missing admin username"), nil
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}
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// This defaults to 1024 and it can also be 2048.
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keyBits := d.Get("key_bits").(int)
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if keyBits != 0 && keyBits != 1024 && keyBits != 2048 {
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return logical.ErrorResponse("invalid key_bits field"), nil
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}
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// If user has not set this field, default it to 1024
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if keyBits == 0 {
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keyBits = 1024
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}
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// Store all the fields required by dynamic key type
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roleEntry = sshRole{
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KeyName: keyName,
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AdminUser: adminUser,
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DefaultUser: defaultUser,
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CIDRList: cidrList,
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ExcludeCIDRList: excludeCidrList,
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Port: port,
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KeyType: KeyTypeDynamic,
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KeyBits: keyBits,
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InstallScript: installScript,
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AllowedUsers: allowedUsers,
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KeyOptionSpecs: keyOptionSpecs,
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}
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} else if keyType == KeyTypeCA {
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role, errorResponse := b.createCARole(allowedUsers, d.Get("default_user").(string), d)
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if errorResponse != nil {
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return errorResponse, nil
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}
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roleEntry = *role
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} else {
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return logical.ErrorResponse("invalid key type"), nil
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}
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entry, err := logical.StorageEntryJSON(fmt.Sprintf("roles/%s", roleName), roleEntry)
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if err != nil {
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return nil, err
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}
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if err := req.Storage.Put(entry); err != nil {
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return nil, err
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}
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return nil, nil
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}
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func (b *backend) createCARole(allowedUsers, defaultUser string, data *framework.FieldData) (*sshRole, *logical.Response) {
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role := &sshRole{
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MaxTTL: data.Get("max_ttl").(string),
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TTL: data.Get("ttl").(string),
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AllowedCriticalOptions: data.Get("allowed_critical_options").(string),
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AllowedExtensions: data.Get("allowed_extensions").(string),
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AllowUserCertificates: data.Get("allow_user_certificates").(bool),
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AllowHostCertificates: data.Get("allow_host_certificates").(bool),
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AllowedUsers: allowedUsers,
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AllowedDomains: data.Get("allowed_domains").(string),
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DefaultUser: defaultUser,
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AllowBareDomains: data.Get("allow_bare_domains").(bool),
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AllowSubdomains: data.Get("allow_subdomains").(bool),
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KeyType: KeyTypeCA,
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}
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defaultCriticalOptions := convertMapToStringValue(data.Get("default_critical_options").(map[string]interface{}))
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defaultExtensions := convertMapToStringValue(data.Get("default_extensions").(map[string]interface{}))
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var maxTTL time.Duration
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maxSystemTTL := b.System().MaxLeaseTTL()
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if len(role.MaxTTL) == 0 {
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maxTTL = maxSystemTTL
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} else {
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var err error
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maxTTL, err = duration.ParseDurationSecond(role.MaxTTL)
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if err != nil {
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return nil, logical.ErrorResponse(fmt.Sprintf(
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"Invalid max ttl: %s", err))
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}
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}
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if maxTTL > maxSystemTTL {
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return nil, logical.ErrorResponse("Requested max TTL is higher than backend maximum")
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}
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ttl := b.System().DefaultLeaseTTL()
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if len(role.TTL) != 0 {
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var err error
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ttl, err = duration.ParseDurationSecond(role.TTL)
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if err != nil {
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return nil, logical.ErrorResponse(fmt.Sprintf(
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"Invalid ttl: %s", err))
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}
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}
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if ttl > maxTTL {
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// If they are using the system default, cap it to the role max;
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// if it was specified on the command line, make it an error
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if len(role.TTL) == 0 {
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ttl = maxTTL
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} else {
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return nil, logical.ErrorResponse(
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`"ttl" value must be less than "max_ttl" and/or backend default max lease TTL value`,
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)
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}
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}
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// Persist clamped TTLs
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role.TTL = ttl.String()
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role.MaxTTL = maxTTL.String()
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role.DefaultCriticalOptions = defaultCriticalOptions
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role.DefaultExtensions = defaultExtensions
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return role, nil
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}
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func (b *backend) getRole(s logical.Storage, n string) (*sshRole, error) {
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entry, err := s.Get("roles/" + n)
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if err != nil {
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return nil, err
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}
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if entry == nil {
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return nil, nil
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}
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var result sshRole
|
|
if err := entry.DecodeJSON(&result); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &result, nil
|
|
}
|
|
|
|
func (b *backend) pathRoleList(req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
|
|
entries, err := req.Storage.List("roles/")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return logical.ListResponse(entries), nil
|
|
}
|
|
|
|
func (b *backend) pathRoleRead(req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
|
|
role, err := b.getRole(req.Storage, d.Get("role").(string))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if role == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
// Return information should be based on the key type of the role
|
|
if role.KeyType == KeyTypeOTP {
|
|
return &logical.Response{
|
|
Data: map[string]interface{}{
|
|
"default_user": role.DefaultUser,
|
|
"cidr_list": role.CIDRList,
|
|
"exclude_cidr_list": role.ExcludeCIDRList,
|
|
"key_type": role.KeyType,
|
|
"port": role.Port,
|
|
"allowed_users": role.AllowedUsers,
|
|
},
|
|
}, nil
|
|
} else if role.KeyType == KeyTypeCA {
|
|
return &logical.Response{
|
|
Data: map[string]interface{}{
|
|
"allowed_users": role.AllowedUsers,
|
|
"allowed_domains": role.AllowedDomains,
|
|
"default_user": role.DefaultUser,
|
|
"max_ttl": role.MaxTTL,
|
|
"ttl": role.TTL,
|
|
"allowed_critical_options": role.AllowedCriticalOptions,
|
|
"allowed_extensions": role.AllowedExtensions,
|
|
"allow_user_certificates": role.AllowUserCertificates,
|
|
"allow_host_certificates": role.AllowHostCertificates,
|
|
"allow_bare_domains": role.AllowBareDomains,
|
|
"allow_subdomains": role.AllowSubdomains,
|
|
"key_type": role.KeyType,
|
|
"default_critical_options": role.DefaultCriticalOptions,
|
|
"default_extensions": role.DefaultExtensions,
|
|
},
|
|
}, nil
|
|
} else {
|
|
return &logical.Response{
|
|
Data: map[string]interface{}{
|
|
"key": role.KeyName,
|
|
"admin_user": role.AdminUser,
|
|
"default_user": role.DefaultUser,
|
|
"cidr_list": role.CIDRList,
|
|
"exclude_cidr_list": role.ExcludeCIDRList,
|
|
"port": role.Port,
|
|
"key_type": role.KeyType,
|
|
"key_bits": role.KeyBits,
|
|
"allowed_users": role.AllowedUsers,
|
|
"key_option_specs": role.KeyOptionSpecs,
|
|
// Returning install script will make the output look messy.
|
|
// But this is one way for clients to see the script that is
|
|
// being used to install the key. If there is some problem,
|
|
// the script can be modified and configured by clients.
|
|
"install_script": role.InstallScript,
|
|
},
|
|
}, nil
|
|
}
|
|
}
|
|
|
|
func (b *backend) pathRoleDelete(req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
|
|
roleName := d.Get("role").(string)
|
|
|
|
// If the role was given privilege to accept any IP address, there will
|
|
// be an entry for this role in zero-address roles list. Before the role
|
|
// is removed, the entry in the list has to be removed.
|
|
err := b.removeZeroAddressRole(req.Storage, roleName)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = req.Storage.Delete(fmt.Sprintf("roles/%s", roleName))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
const pathRoleHelpSyn = `
|
|
Manage the 'roles' that can be created with this backend.
|
|
`
|
|
|
|
const pathRoleHelpDesc = `
|
|
This path allows you to manage the roles that are used to generate credentials.
|
|
|
|
Role takes a 'key_type' parameter that decides what type of credential this role
|
|
can generate. If remote hosts have Vault SSH Agent installed, an 'otp' type can
|
|
be used, otherwise 'dynamic' type can be used.
|
|
|
|
If the backend is mounted at "ssh" and the role is created at "ssh/roles/web",
|
|
then a user could request for a credential at "ssh/creds/web" for an IP that
|
|
belongs to the role. The credential will be for the 'default_user' registered
|
|
with the role. There is also an optional parameter 'username' for 'creds/' endpoint.
|
|
`
|