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token.go
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token.go
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package ca
import (
"fmt"
"os"
"github.com/smallstep/certificates/api"
"github.com/smallstep/cli/command"
"github.com/smallstep/cli/crypto/pki"
"github.com/smallstep/cli/errs"
"github.com/smallstep/cli/flags"
"github.com/smallstep/cli/utils"
"github.com/smallstep/cli/utils/cautils"
"github.com/urfave/cli"
)
func tokenCommand() cli.Command {
// Avoid the conflict with --not-before --not-after
certNotBeforeFlag := flags.NotBefore
certNotAfterFlag := flags.NotAfter
certNotBeforeFlag.Name = "cert-not-before"
certNotAfterFlag.Name = "cert-not-after"
return cli.Command{
Name: "token",
Action: command.ActionFunc(tokenAction),
Usage: "generate an OTT granting access to the CA",
UsageText: `**step ca token** <subject>
[--**kid**=<kid>] [--**issuer**=<name>] [**--ca-url**=<uri>] [**--root**=<file>]
[**--not-before**=<time|duration>] [**--not-after**=<time|duration>]
[**--password-file**=<file>] [**--output-file**=<file>] [**--key**=<path>]
[**--san**=<SAN>] [**--offline**] [**--revoke**]`,
Description: `**step ca token** command generates a one-time token granting access to the
certificates authority.
## POSITIONAL ARGUMENTS
<subject>
: The Common Name, DNS Name, or IP address that will be set by the certificate authority.
When there are no additional Subject Alternative Names configured (via the
--san flag), the subject will be added as the only element of the 'sans' claim
on the token.
## EXAMPLES
Most of the following examples assumes that **--ca-url** and **--root** are
set using environment variables or the default configuration file in
<$STEPPATH/config/defaults.json>.
Get a new token for a DNS. Because there are no Subject Alternative Names
configured (via the '--san' flag), the 'sans' claim of the token will have a
default value of ['internal.example.com']:
'''
$ step ca token internal.example.com
'''
Get a new token for a 'Revoke' request:
'''
$ step ca token --revoke 146103349666685108195655980390445292315
'''
Get a new token for an IP address. Because there are no Subject Alternative Names
configured (via the '--san' flag), the 'sans' claim of the token will have a
default value of ['192.168.10.10']:
'''
$ step ca token 192.168.10.10
'''
Get a new token with custom Subject Alternative Names. The value of the 'sans'
claim of the token will be ['1.1.1.1', 'hello.example.com'] - 'foobar' will not
be in the 'sans' claim unless explicitly configured via the '--sans' flag:
'''
$ step ca token foobar --san 1.1.1.1 --san hello.example.com
'''
Get a new token that expires in 30 minutes:
'''
$ step ca token --not-after 30m internal.example.com
'''
Get a new token that becomes valid in 30 minutes and expires 5 minutes after that:
'''
$ step ca token --not-before 30m --not-after 35m internal.example.com
'''
Get a new token signed with the given private key, the public key must be
configured in the certificate authority:
'''
$ step ca token internal.smallstep.com --key token.key
'''
Get a new token for a specific provisioner kid, ca-url and root:
'''
$ step ca token internal.example.com \
--kid 4vn46fbZT68Uxfs9LBwHkTvrjEvxQqx-W8nnE-qDjts \
--ca-url https://ca.example.com \
--root /path/to/root_ca.crt
'''
Get a new token using the simple offline mode, requires the configuration
files, certificates, and keys created with **step ca init**:
'''
$ step ca token internal.example.com --offline
'''
Get a new token using the offline mode with all the parameters:
'''
$ step ca token internal.example.com \
--offline \
--kid 4vn46fbZT68Uxfs9LBwHkTvrjEvxQqx-W8nnE-qDjts \
--issuer you@example.com \
--key provisioner.key \
--ca-url https://ca.example.com \
--root /path/to/root_ca.crt
'''
Get a new token for a 'Revoke' request:
'''
$ step ca token --revoke 146103349666685108195655980390445292315
'''
Get a new token in offline mode for a 'Revoke' request:
'''
$ step ca token --offline --revoke 146103349666685108195655980390445292315
'''
`,
Flags: []cli.Flag{
certNotAfterFlag,
certNotBeforeFlag,
notBeforeFlag,
notAfterFlag,
provisionerKidFlag,
sshPrincipalFlag,
sshHostFlag,
flags.CaURL,
flags.CaConfig,
flags.Force,
flags.Root,
flags.Provisioner,
cli.StringSliceFlag{
Name: "san",
Usage: `Add DNS or IP Address Subjective Alternative Names (SANs) that the token is
authorized to request. A certificate signing request using this token must match
the complete set of subjective alternative names in the token 1:1. Use the '--san'
flag multiple times to configure multiple SANs.`,
},
cli.StringFlag{
Name: "key",
Usage: `The private key <path> used to sign the JWT. This is usually downloaded from
the certificate authority.`,
},
passwordFileFlag,
cli.StringFlag{
Name: "output-file",
Usage: "The destination <file> of the generated one-time token.",
},
cli.BoolFlag{
Name: "offline",
Usage: `Creates a token without contacting the certificate authority. Offline mode
requires the flags <--ca-config> or <--kid>, <--issuer>, <--key>, <--ca-url>, and <--root>.`,
},
cli.BoolFlag{
Name: "revoke",
Usage: `Create a token for authorizing 'Revoke' requests. The audience will
be invalid for any other API request.`,
},
cli.BoolFlag{
Name: "ssh",
Usage: `Create a token for authorizing an SSH certificate signing request.`,
},
},
}
}
func tokenAction(ctx *cli.Context) error {
if err := errs.NumberOfArguments(ctx, 1); err != nil {
return err
}
subject := ctx.Args().Get(0)
outputFile := ctx.String("output-file")
offline := ctx.Bool("offline")
// x.509 flags
sans := ctx.StringSlice("san")
isRevoke := ctx.Bool("revoke")
// ssh flags
isSSH := ctx.Bool("ssh")
isHost := ctx.Bool("host")
principals := ctx.StringSlice("principal")
switch {
case isSSH && isRevoke:
return errs.IncompatibleFlagWithFlag(ctx, "ssh", "revoke")
case isSSH && len(sans) > 0:
return errs.IncompatibleFlagWithFlag(ctx, "ssh", "san")
case isHost && len(sans) > 0:
return errs.IncompatibleFlagWithFlag(ctx, "host", "san")
case len(principals) > 0 && len(sans) > 0:
return errs.IncompatibleFlagWithFlag(ctx, "principal", "san")
case !isSSH && isHost:
return errs.RequiredWithFlag(ctx, "host", "ssh")
case !isSSH && len(principals) > 0:
return errs.RequiredWithFlag(ctx, "principal", "ssh")
}
// Default token type is always a 'Sign' token.
var typ int
switch {
case isSSH && isHost:
typ = cautils.SSHHostSignType
sans = principals
case isSSH && !isHost:
typ = cautils.SSHUserSignType
sans = principals
case isRevoke:
typ = cautils.RevokeType
default:
typ = cautils.SignType
}
caURL := ctx.String("ca-url")
if len(caURL) == 0 {
return errs.RequiredFlag(ctx, "ca-url")
}
root := ctx.String("root")
if len(root) == 0 {
root = pki.GetRootCAPath()
if _, err := os.Stat(root); err != nil {
return errs.RequiredFlag(ctx, "root")
}
}
// --san and --type revoke are incompatible. Revocation tokens do not support SANs.
if typ == cautils.RevokeType && len(sans) > 0 {
return errs.IncompatibleFlagWithFlag(ctx, "san", "revoke")
}
// parse times or durations
notBefore, ok := flags.ParseTimeOrDuration(ctx.String("not-before"))
if !ok {
return errs.InvalidFlagValue(ctx, "not-before", ctx.String("not-before"), "")
}
notAfter, ok := flags.ParseTimeOrDuration(ctx.String("not-after"))
if !ok {
return errs.InvalidFlagValue(ctx, "not-after", ctx.String("not-after"), "")
}
// parse certificates durations
certNotBefore, err := api.ParseTimeDuration(ctx.String("cert-not-before"))
if err != nil {
return errs.InvalidFlagValue(ctx, "cert-not-before", ctx.String("cert-not-before"), "")
}
certNotAfter, err := api.ParseTimeDuration(ctx.String("cert-not-after"))
if err != nil {
return errs.InvalidFlagValue(ctx, "cert-not-after", ctx.String("cert-not-after"), "")
}
var token string
if offline {
token, err = cautils.OfflineTokenFlow(ctx, typ, subject, sans, notBefore, notAfter, certNotBefore, certNotAfter)
if err != nil {
return err
}
} else {
token, err = cautils.NewTokenFlow(ctx, typ, subject, sans, caURL, root, notBefore, notAfter, certNotBefore, certNotAfter)
if err != nil {
return err
}
}
if len(outputFile) > 0 {
return utils.WriteFile(outputFile, []byte(token), 0600)
}
fmt.Println(token)
return nil
}