Add secret support to podman login

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

cmd/podman/login.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"context"
+	"errors"
+	"fmt"
 	"os"
 
 	"github.com/containers/common/pkg/auth"
@@ -9,6 +11,7 @@ import (
 	"github.com/containers/image/v5/types"
 	"github.com/containers/podman/v4/cmd/podman/common"
 	"github.com/containers/podman/v4/cmd/podman/registry"
+	"github.com/containers/podman/v4/pkg/domain/entities"
 	"github.com/spf13/cobra"
 )
 
@@ -48,7 +51,11 @@ func init() {
 	completion.CompleteCommandFlags(loginCommand, auth.GetLoginFlagsCompletions())
 
 	// Podman flags.
-	flags.BoolVarP(&loginOptions.tlsVerify, "tls-verify", "", false, "Require HTTPS and verify certificates when contacting registries")
+	secretFlagName := "secret"
+	flags.BoolVar(&loginOptions.tlsVerify, "tls-verify", false, "Require HTTPS and verify certificates when contacting registries")
+	flags.String(secretFlagName, "", "Retrieve passwd from secret file")
+	_ = loginCommand.RegisterFlagCompletionFunc(secretFlagName, common.AutocompleteSecrets)
+
 	loginOptions.Stdin = os.Stdin
 	loginOptions.Stdout = os.Stdout
 	loginOptions.AcceptUnspecifiedRegistry = true
@@ -63,6 +70,31 @@ func login(cmd *cobra.Command, args []string) error {
 		skipTLS = types.NewOptionalBool(!loginOptions.tlsVerify)
 	}
 
+	secretName := cmd.Flag("secret").Value.String()
+	if len(secretName) > 0 {
+		if len(loginOptions.Password) > 0 {
+			return errors.New("--secret can not be used with --password options")
+		}
+		if len(loginOptions.Username) == 0 {
+			loginOptions.Username = secretName
+		}
+		var inspectOpts = entities.SecretInspectOptions{
+			ShowSecret: true,
+		}
+		inspected, errs, _ := registry.ContainerEngine().SecretInspect(context.Background(), []string{secretName}, inspectOpts)
+
+		if len(errs) > 0 && errs[0] != nil {
+			return errs[0]
+		}
+		if len(inspected) == 0 {
+			return fmt.Errorf("no secrets found for %q", secretName)
+		}
+		if len(inspected) > 1 {
+			return fmt.Errorf("unexpected error SecretInspect of a single secret should never return more then one secrets %q", secretName)
+		}
+		loginOptions.Password = inspected[0].SecretData
+	}
+
 	sysCtx := &types.SystemContext{
 		AuthFilePath:                loginOptions.AuthFile,
 		DockerCertPath:              loginOptions.CertDir,

docs/source/markdown/podman-login.1.md.in

@@ -48,6 +48,11 @@ Password for registry
 
 Take the password from stdin
 
+#### **--secret**=*name*
+
+Read the password for the registry from the podman secret `name`.
+If --username is not specified --username=`name` is used.
+
 @@option tls-verify
 
 #### **--username**, **-u**=*username*
@@ -79,6 +84,13 @@ Password:
 Login Succeeded!
 ```
 
+```
+$ echo -n MySecret! | podman secret create secretname -
+a0ad54df3c97cf89d5ca6193c
+$ podman login --secret secretname -u testuser quay.io
+Login Succeeded!
+```
+
 ```
 $ podman login --tls-verify=false -u test -p test localhost:5000
 Login Succeeded!
@@ -108,7 +120,7 @@ Login Succeeded!
 ```
 
 ## SEE ALSO
-**[podman(1)](podman.1.md)**, **[podman-logout(1)](podman-logout.1.md)**, **[containers-auth.json(5)](https://github.com/containers/image/blob/main/docs/containers-auth.json.5.md)**, **[containers-certs.d(5)](https://github.com/containers/image/blob/main/docs/containers-certs.d.5.md)**, **[containers-registries.conf(5)](https://github.com/containers/image/blob/main/docs/containers-registries.conf.5.md)**
+**[podman(1)](podman.1.md)**, **[podman-logout(1)](podman-logout.1.md)**, **[containers-auth.json(5)](https://github.com/containers/image/blob/main/docs/containers-auth.json.5.md)**, **[containers-certs.d(5)](https://github.com/containers/image/blob/main/docs/containers-certs.d.5.md)**, **[containers-registries.conf(5)](https://github.com/containers/image/blob/main/docs/containers-registries.conf.5.md)**, **[podman-secret(1)](podman-secret.1.md)**, **[podman-secret-create(1)](podman-secret-create.1.md)**
 
 ## HISTORY
 August 2017, Originally compiled by Urvashi Mohnani <umohnani@redhat.com>

docs/source/markdown/podman-secret-create.1.md

@@ -18,6 +18,8 @@ TLS certificates and keys, SSH keys or other important generic strings or binary
 
 Secrets are not committed to an image with `podman commit`, and does not get committed in the archive created by a `podman export` command.
 
+Secrets can also be used to store passwords for `podman login` to authenticate against container registries.
+
 ## OPTIONS
 
 #### **--driver**, **-d**=*driver*
@@ -55,7 +57,7 @@ $ printf <secret> | podman secret create my_secret -
 ```
 
 ## SEE ALSO
-**[podman(1)](podman.1.md)**, **[podman-secret(1)](podman-secret.1.md)**
+**[podman(1)](podman.1.md)**, **[podman-secret(1)](podman-secret.1.md)**, **[podman-login(1)](podman-login.1.md)**
 
 ## HISTORY
 January 2021, Originally compiled by Ashley Cui <acui@redhat.com>

test/system/150-login.bats

@@ -241,6 +241,49 @@ function _test_skopeo_credential_sharing() {
     rm -f $authfile
 }
 
+@test "podman login -secret test" {
+    secret=$(random_string 10)
+    echo -n ${PODMAN_LOGIN_PASS} > $PODMAN_TMPDIR/secret.file
+    run_podman secret create $secret $PODMAN_TMPDIR/secret.file
+    secretID=${output}
+    run_podman login --tls-verify=false \
+             --username ${PODMAN_LOGIN_USER} \
+             --secret ${secretID} \
+             localhost:${PODMAN_LOGIN_REGISTRY_PORT}
+    is "$output" "Login Succeeded!" "output from podman login"
+    # Now log out
+    run_podman logout localhost:${PODMAN_LOGIN_REGISTRY_PORT}
+    is "$output" "Removed login credentials for localhost:${PODMAN_LOGIN_REGISTRY_PORT}" \
+       "output from podman logout"
+    run_podman secret rm $secret
+
+    # test using secret id as --username
+    run_podman secret create ${PODMAN_LOGIN_USER} $PODMAN_TMPDIR/secret.file
+    run_podman login --tls-verify=false \
+               --secret ${PODMAN_LOGIN_USER} \
+               localhost:${PODMAN_LOGIN_REGISTRY_PORT}
+    is "$output" "Login Succeeded!" "output from podman login"
+    # Now log out
+    run_podman logout localhost:${PODMAN_LOGIN_REGISTRY_PORT}
+    is "$output" "Removed login credentials for localhost:${PODMAN_LOGIN_REGISTRY_PORT}" \
+       "output from podman logout"
+    run_podman secret rm ${PODMAN_LOGIN_USER}
+
+    bogus_secret=$(random_string 10)
+    echo -n ${bogus_secret} > $PODMAN_TMPDIR/secret.file
+    run_podman secret create $secret $PODMAN_TMPDIR/secret.file
+    secretID=${output}
+    run_podman 125 login --tls-verify=false \
+             --username ${PODMAN_LOGIN_USER} \
+             --secret ${secretID} \
+             localhost:${PODMAN_LOGIN_REGISTRY_PORT}
+
+    is "$output" "Error: logging into \"localhost:${PODMAN_LOGIN_REGISTRY_PORT}\": invalid username/password" "output from failed podman login"
+
+    run_podman secret rm $secret
+
+}
+
 # END   cooperation with skopeo
 # END   actual tests
 ###############################################################################