800583681

Build Type

gitlab-ci

Committed by Fabio Tranchitella

Commit Message

feat: add support for never expiring PATs

Pull Request Pull Request #354: feat: add support for never expiring PATs

Run Details

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93.61

/user/useradm.go

// Copyright 2023 Northern.tech AS
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.

package useradm

import (
        "context"
        "time"

        "github.com/mendersoftware/go-lib-micro/apiclient"
        "github.com/mendersoftware/go-lib-micro/identity"
        "github.com/mendersoftware/go-lib-micro/log"
        "github.com/mendersoftware/go-lib-micro/mongo/oid"
        "github.com/pkg/errors"
        "golang.org/x/crypto/bcrypt"

        "github.com/mendersoftware/useradm/client/tenant"
        "github.com/mendersoftware/useradm/jwt"
        "github.com/mendersoftware/useradm/model"
        "github.com/mendersoftware/useradm/scope"
        "github.com/mendersoftware/useradm/store"
)

var (
        ErrUserNotFound           = store.ErrUserNotFound
        ErrDuplicateEmail         = store.ErrDuplicateEmail
        ErrETagMismatch           = errors.New("entity tag did not match any records")
        ErrUnauthorized           = errors.New("unauthorized")
        ErrAuthExpired            = errors.New("token expired")
        ErrAuthInvalid            = errors.New("token is invalid")
        ErrTenantAccountSuspended = errors.New("tenant account suspended")
        ErrInvalidTenantID        = errors.New("invalid tenant id")
        ErrTooManyTokens          = errors.New(
                "maximum number of personal acess tokens reached for this user")
        ErrDuplicateTokenName = errors.New(
                "Personal Access Token with a given name already exists")
        // password mismatch
        ErrCurrentPasswordMismatch = errors.New("current password mismatch")
        // modification of other user's password is not allowed
        ErrCannotModifyPassword = errors.New("password cannot be modified")
)

const (
        TenantStatusSuspended = "suspended"
        userIdMe              = "me"
)

var endOfCentury, _ = time.Parse(time.RFC3339, "2099-12-31T23:59:59Z")

//go:generate ../utils/mockgen.sh
type App interface {
        HealthCheck(ctx context.Context) error
        // Login accepts email/password, returns JWT
        Login(ctx context.Context, email model.Email, pass string) (*jwt.Token, error)
        Logout(ctx context.Context, token *jwt.Token) error
        CreateUser(ctx context.Context, u *model.User) error
        CreateUserInternal(ctx context.Context, u *model.UserInternal) error
        UpdateUser(ctx context.Context, id string, u *model.UserUpdate) error
        Verify(ctx context.Context, token *jwt.Token) error
        GetUsers(ctx context.Context, fltr model.UserFilter) ([]model.User, error)
        GetUser(ctx context.Context, id string) (*model.User, error)
        DeleteUser(ctx context.Context, id string) error
        SetPassword(ctx context.Context, u model.UserUpdate) error

        // SignToken generates a signed
        // token using configuration & method set up in UserAdmApp
        SignToken(ctx context.Context, t *jwt.Token) (string, error)
        DeleteToken(ctx context.Context, id string) error

        // IssuePersonalAccessToken issues Personal Access Token
        IssuePersonalAccessToken(ctx context.Context, tr *model.TokenRequest) (string, error)
        // GetPersonalAccessTokens returns list of Personal Access Tokens
        GetPersonalAccessTokens(ctx context.Context, userID string) ([]model.PersonalAccessToken, error)

        DeleteTokens(ctx context.Context, tenantId, userId string) error

        CreateTenant(ctx context.Context, tenant model.NewTenant) error
}

type Config struct {
        // token issuer
        Issuer string
        // token expiration time
        ExpirationTime int64
        // maximum number of personal access tokens per user
        // zero means no limit
        LimitTokensPerUser int
        // how often we should update personal access token
        // with last used timestamp
        TokenLastUsedUpdateFreqMinutes int
}

type ApiClientGetter func() apiclient.HttpRunner

func simpleApiClientGetter() apiclient.HttpRunner {
        return &apiclient.HttpApi{}
}

type UserAdm struct {
        // JWT serialized/deserializer
        jwtHandler   jwt.Handler
        db           store.DataStore
        config       Config
        verifyTenant bool
        cTenant      tenant.ClientRunner
        clientGetter ApiClientGetter
}

func NewUserAdm(jwtHandler jwt.Handler, db store.DataStore, config Config) *UserAdm {

        return &UserAdm{
                jwtHandler:   jwtHandler,
                db:           db,
                config:       config,
                clientGetter: simpleApiClientGetter,
        }
}

func (u *UserAdm) HealthCheck(ctx context.Context) error {
        err := u.db.Ping(ctx)
        if err != nil {
                return errors.Wrap(err, "error reaching MongoDB")
        }

        if u.verifyTenant {
                err = u.cTenant.CheckHealth(ctx)
                if err != nil {
                        return errors.Wrap(err, "Tenantadm service unhealthy")
                }
        }

        return nil
}

func (u *UserAdm) Login(ctx context.Context, email model.Email, pass string) (*jwt.Token, error) {
        var ident identity.Identity
        l := log.FromContext(ctx)

        if email == "" {
                return nil, ErrUnauthorized
        }

        if u.verifyTenant {
                // check the user's tenant
                tenant, err := u.cTenant.GetTenant(ctx, string(email), u.clientGetter())

                if err != nil {
                        return nil, errors.Wrap(err, "failed to check user's tenant")
                }

                if tenant == nil {
                        return nil, ErrUnauthorized
                }

                if tenant.Status == TenantStatusSuspended {
                        return nil, ErrTenantAccountSuspended
                }

                ident.Tenant = tenant.ID
                ctx = identity.WithContext(ctx, &ident)
        }

        //get user
        user, err := u.db.GetUserByEmail(ctx, email)

        if user == nil && err == nil {
                return nil, ErrUnauthorized
        }

        if err != nil {
                return nil, errors.Wrap(err, "useradm: failed to get user")
        }

        //verify password
        err = bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(pass))
        if err != nil {
                return nil, ErrUnauthorized
        }

        //generate and save token
        t, err := u.generateToken(user.ID, scope.All, ident.Tenant)
        if err != nil {
                return nil, errors.Wrap(err, "useradm: failed to generate token")
        }

        err = u.db.SaveToken(ctx, t)
        if err != nil {
                return nil, errors.Wrap(err, "useradm: failed to save token")
        }

        if err = u.db.UpdateLoginTs(ctx, user.ID); err != nil {
                l.Warnf("failed to update login timestamp: %s", err.Error())
        }

        return t, nil
}

func (u *UserAdm) generateToken(subject, scope, tenant string) (*jwt.Token, error) {
        id := oid.NewUUIDv4()
        subjectID := oid.FromString(subject)
        now := jwt.Time{Time: time.Now()}
        ret := &jwt.Token{Claims: jwt.Claims{
                ID:        id,
                Subject:   subjectID,
                Issuer:    u.config.Issuer,
                IssuedAt:  now,
                NotBefore: now,
                ExpiresAt: jwt.Time{
                        Time: now.Add(time.Second *
                                time.Duration(u.config.ExpirationTime)),
                },
                Tenant: tenant,
                Scope:  scope,
                User:   true,
        }}
        return ret, ret.Claims.Valid()
}

func (u *UserAdm) SignToken(ctx context.Context, t *jwt.Token) (string, error) {
        return u.jwtHandler.ToJWT(t)
}

func (u *UserAdm) Logout(ctx context.Context, token *jwt.Token) error {
        return u.db.DeleteToken(ctx, token.Subject, token.ID)
}

func (ua *UserAdm) CreateUser(ctx context.Context, u *model.User) error {
        hash, err := bcrypt.GenerateFromPassword([]byte(u.Password), bcrypt.DefaultCost)
        if err != nil {
                return errors.Wrap(err, "failed to generate password hash")
        }
        u.Password = string(hash)

        return ua.doCreateUser(ctx, u, true)
}

func (ua *UserAdm) CreateUserInternal(ctx context.Context, u *model.UserInternal) error {
        if u.PasswordHash != "" {
                u.Password = u.PasswordHash
        } else {
                hash, err := bcrypt.GenerateFromPassword([]byte(u.Password), bcrypt.DefaultCost)
                if err != nil {
                        return errors.Wrap(err, "failed to generate password hash")
                }
                u.Password = string(hash)
        }

        return ua.doCreateUser(ctx, &u.User, u.ShouldPropagate())
}

func (ua *UserAdm) doCreateUser(ctx context.Context, u *model.User, propagate bool) error {
        var tenantErr error

        if u.ID == "" {
                //technically one of the functions down the oid.NewUUIDv4() stack can panic,
                //so what we could do is: wrap around it and recover and fall back
                //to non-rand based generation (NewUUIDv5(u.Email)).
                //on the other hand if rand failed maybe it is a good idea t not continue
                //after all.
                //the previous call to NewUUIDv5 produced exact the same ids for same
                //emails, which leads to problems once user changes the email address,
                //and then the old email is used in the new user creation.
                id := oid.NewUUIDv4()
                u.ID = id.String()
        }

        id := identity.FromContext(ctx)
        if ua.verifyTenant && propagate {
                tenantErr = ua.cTenant.CreateUser(ctx,
                        &tenant.User{
                                ID:       u.ID,
                                Name:     string(u.Email),
                                TenantID: id.Tenant,
                        },
                        ua.clientGetter())

                if tenantErr != nil && tenantErr != tenant.ErrDuplicateUser {
                        return errors.Wrap(tenantErr, "useradm: failed to create user in tenantadm")
                }
        }

        if tenantErr == tenant.ErrDuplicateUser {
                // check if the user exists in useradm
                // if the user does not exists then we should try to remove the user from tenantadm
                user, err := ua.db.GetUserByEmail(ctx, u.Email)
                if err != nil {
                        return errors.Wrap(err, "tenant data out of sync: failed to get user from db")
                }
                if user == nil {
                        if compensateErr := ua.compensateTenantUser(
                                ctx,
                                u.ID,
                                id.Tenant,
                        ); compensateErr != nil {
                                tenantErr = compensateErr
                        }
                        return errors.Wrap(tenantErr, "tenant data out of sync")
                }
                return store.ErrDuplicateEmail
        }

        if err := ua.db.CreateUser(ctx, u); err != nil {
                if err == store.ErrDuplicateEmail {
                        return err
                }
                if ua.verifyTenant && propagate {
                        // if the user could not be created in the useradm database
                        // try to remove the user from tenantadm
                        if compensateErr := ua.compensateTenantUser(
                                ctx,
                                u.ID,
                                id.Tenant,
                        ); compensateErr != nil {
                                err = errors.Wrap(err, compensateErr.Error())
                        }
                }

                return errors.Wrap(err, "useradm: failed to create user in the db")
        }

        return nil
}

func (ua *UserAdm) compensateTenantUser(ctx context.Context, userId, tenantId string) error {
        err := ua.cTenant.DeleteUser(ctx, tenantId, userId, ua.clientGetter())

        if err != nil {
                return errors.Wrap(err, "faield to delete tenant user")
        }
        return nil
}

func (ua *UserAdm) validateUserUpdate(
        ctx context.Context,
        user *model.User,
        u *model.UserUpdate,
        me bool,
) error {
        // user can change own password only
        if !me {
                if len(u.Password) > 0 {
                        return ErrCannotModifyPassword
                }
        } else {
                // when changing own password or email address
                // user has to provide current password
                if len(u.Password) > 0 || (u.Email != "" && u.Email != user.Email) {
                        if err := bcrypt.CompareHashAndPassword(
                                []byte(user.Password),
                                []byte(u.CurrentPassword),
                        ); err != nil {
                                return ErrCurrentPasswordMismatch
                        }
                }
        }
        return nil
}

func (ua *UserAdm) deleteAndInvalidateUserTokens(
        ctx context.Context,
        userID string,
        token *jwt.Token,
) error {
        var err error
        if token != nil {
                err = ua.db.DeleteTokensByUserIdExceptCurrentOne(ctx, userID, token.ID)
        } else {
                err = ua.db.DeleteTokensByUserId(ctx, userID)
        }
        return err
}

func (ua *UserAdm) UpdateUser(ctx context.Context, id string, userUpdate *model.UserUpdate) error {
        idty := identity.FromContext(ctx)
        me := idty.Subject == id
        user, err := ua.db.GetUserAndPasswordById(ctx, id)
        if err != nil {
                return errors.Wrap(err, "useradm: failed to get user")
        } else if user == nil {
                return store.ErrUserNotFound
        }

        if err := ua.validateUserUpdate(ctx, user, userUpdate, me); err != nil {
                return err
        }

        if userUpdate.ETag == nil {
                // Update without the support for etags.
                next := user.NextETag()
                userUpdate.ETagUpdate = &next
                userUpdate.ETag = user.ETag
                if user.ETag == nil {
                        // If the ETag field is not set, assign the etag to nil
                        user.ETag = &model.ETagNil
                }
        } else if user.ETag == nil || *userUpdate.ETag != *user.ETag {
                return ErrETagMismatch
        }

        if len(userUpdate.Email) > 0 && userUpdate.Email != user.Email {
                if ua.verifyTenant {
                        err := ua.cTenant.UpdateUser(ctx,
                                idty.Tenant,
                                id,
                                &tenant.UserUpdate{
                                        Name: string(userUpdate.Email),
                                },
                                ua.clientGetter())

                        switch err {
                        case nil:
                                break
                        case tenant.ErrDuplicateUser:
                                return store.ErrDuplicateEmail
                        case tenant.ErrUserNotFound:
                                return store.ErrUserNotFound
                        default:
                                return errors.Wrap(err, "useradm: failed to update user in tenantadm")
                        }
                }
        }

        _, err = ua.db.UpdateUser(ctx, id, userUpdate)
        switch err {
        case nil:
                // invalidate the JWT tokens but the one used to update the user
                err = ua.deleteAndInvalidateUserTokens(ctx, id, userUpdate.Token)
                err = errors.Wrap(err, "useradm: failed to invalidate tokens")

        case store.ErrUserNotFound:
                // We matched the user earlier, the ETag must have changed in
                // the meantime
                err = ErrETagMismatch
        case store.ErrDuplicateEmail:
                break

        default:
                err = errors.Wrap(err, "useradm: failed to update user information")
        }

        return err
}

func (ua *UserAdm) Verify(ctx context.Context, token *jwt.Token) error {

        if token == nil {
                return ErrUnauthorized
        }

        l := log.FromContext(ctx)

        if !token.Claims.User {
                l.Errorf("not a user token")
                return ErrUnauthorized
        }

        if ua.verifyTenant {
                if token.Claims.Tenant == "" {
                        l.Errorf("Token has no tenant claim")
                        return jwt.ErrTokenInvalid
                }
        } else if token.Claims.Tenant != "" {
                l.Errorf("Unexpected tenant claim: %s in the token", token.Claims.Tenant)
                return jwt.ErrTokenInvalid
        }

        user, err := ua.db.GetUserById(ctx, token.Claims.Subject.String())
        if user == nil && err == nil {
                return ErrUnauthorized
        }
        if err != nil {
                return errors.Wrap(err, "useradm: failed to get user")
        }

        dbToken, err := ua.db.GetTokenById(ctx, token.ID)
        if dbToken == nil && err == nil {
                return ErrUnauthorized
        }
        if err != nil {
                return errors.Wrap(err, "useradm: failed to get token")
        }

        // in case the token is a personal access token, update last used timestam
        // to not overload the database with writes to tokens collection, we do not
        // update the timestamp every time, but instead we wait some configurable
        // amount of time between updates
        if dbToken.TokenName != nil && ua.config.TokenLastUsedUpdateFreqMinutes > 0 {
                t := time.Now().Add(
                        (-time.Minute * time.Duration(ua.config.TokenLastUsedUpdateFreqMinutes)))
                if dbToken.LastUsed == nil || dbToken.LastUsed.Before(t) {
                        if err := ua.db.UpdateTokenLastUsed(ctx, token.ID); err != nil {
                                return err
                        }
                }
        }

        return nil
}

func (ua *UserAdm) GetUsers(ctx context.Context, fltr model.UserFilter) ([]model.User, error) {
        users, err := ua.db.GetUsers(ctx, fltr)
        if err != nil {
                return nil, errors.Wrap(err, "useradm: failed to get users")
        }

        return users, nil
}

func (ua *UserAdm) GetUser(ctx context.Context, id string) (*model.User, error) {
        if id == userIdMe {
                id = identity.FromContext(ctx).Subject
        }
        user, err := ua.db.GetUserById(ctx, id)
        if err != nil {
                return nil, errors.Wrap(err, "useradm: failed to get user")
        }

        return user, nil
}

func (ua *UserAdm) DeleteUser(ctx context.Context, id string) error {
        if ua.verifyTenant {
                identity := identity.FromContext(ctx)
                err := ua.cTenant.DeleteUser(ctx, identity.Tenant, id, ua.clientGetter())

                if err != nil {
                        return errors.Wrap(err, "useradm: failed to delete user in tenantadm")
                }
        }

        err := ua.db.DeleteUser(ctx, id)
        if err != nil {
                return errors.Wrap(err, "useradm: failed to delete user")
        }

        // remove user tokens
        err = ua.db.DeleteTokensByUserId(ctx, id)
        if err != nil {
                return errors.Wrap(err, "useradm: failed to delete user tokens")
        }

        return nil
}

// WithTenantVerification produces a UserAdm instance which enforces
// tenant verification vs the tenantadm service upon /login.
func (u *UserAdm) WithTenantVerification(c tenant.ClientRunner) *UserAdm {
        u.verifyTenant = true
        u.cTenant = c
        return u
}

func (u *UserAdm) CreateTenant(ctx context.Context, tenant model.NewTenant) error {
        return nil
}

func (ua *UserAdm) SetPassword(ctx context.Context, uu model.UserUpdate) error {
        u, err := ua.db.GetUserByEmail(ctx, uu.Email)
        if err != nil {
                return errors.Wrap(err, "useradm: failed to get user by email")

        }
        if u == nil {
                return ErrUserNotFound
        }

        _, err = ua.db.UpdateUser(ctx, u.ID, &uu)

        // if we changed the password, invalidate the JWT tokens but the one used to update the user
        if err == nil && uu.Password != "" {
                if uu.Token != nil {
                        err = ua.db.DeleteTokensByUserIdExceptCurrentOne(ctx, u.ID, uu.Token.ID)
                } else {
                        err = ua.db.DeleteTokensByUserId(ctx, u.ID)
                }
        }
        if err != nil {
                return errors.Wrap(err, "useradm: failed to update user information")
        }

        return nil
}

func (ua *UserAdm) DeleteTokens(ctx context.Context, tenantId, userId string) error {
        ctx = identity.WithContext(ctx, &identity.Identity{
                Tenant: tenantId,
        })

        var err error

        if userId != "" {
                err = ua.db.DeleteTokensByUserId(ctx, userId)
        } else {
                err = ua.db.DeleteTokens(ctx)
        }

        if err != nil && err != store.ErrTokenNotFound {
                return errors.Wrapf(
                        err,
                        "failed to delete tokens for tenant: %v, user id: %v",
                        tenantId,
                        userId,
                )
        }

        return nil
}

func (u *UserAdm) IssuePersonalAccessToken(
        ctx context.Context,
        tr *model.TokenRequest,
) (string, error) {
        id := identity.FromContext(ctx)
        if id == nil {
                return "", errors.New("identity not present in the context")
        }
        if u.config.LimitTokensPerUser > 0 {
                count, err := u.db.CountPersonalAccessTokens(ctx, id.Subject)
                if err != nil {
                        return "", errors.Wrap(err, "useradm: failed to count personal access tokens")
                }
                if count >= int64(u.config.LimitTokensPerUser) {
                        return "", ErrTooManyTokens
                }
        }
        //generate and save token
        t, err := u.generateToken(id.Subject, scope.All, id.Tenant)
        if err != nil {
                return "", errors.Wrap(err, "useradm: failed to generate token")
        }
        // update claims
        t.TokenName = tr.Name
        expires := jwt.Time{Time: endOfCentury}
        if tr.ExpiresIn > 0 {
                expires = jwt.Time{
                        Time: time.Now().Add(time.Second * time.Duration(tr.ExpiresIn)),
                }
        }
        t.ExpiresAt = expires

        err = u.db.SaveToken(ctx, t)
        if err == store.ErrDuplicateTokenName {
                return "", ErrDuplicateTokenName
        } else if err != nil {
                return "", errors.Wrap(err, "useradm: failed to save token")
        }

        // sign token
        return u.jwtHandler.ToJWT(t)
}

func (ua *UserAdm) GetPersonalAccessTokens(
        ctx context.Context,
        userID string,
) ([]model.PersonalAccessToken, error) {
        tokens, err := ua.db.GetPersonalAccessTokens(ctx, userID)
        if err != nil {
                return nil, errors.Wrap(err, "useradm: failed to get tokens")
        }

        return tokens, nil
}

func (ua *UserAdm) DeleteToken(ctx context.Context, id string) error {
        identity := identity.FromContext(ctx)
        if identity == nil {
                return errors.New("identity not present in the context")
        }
        err := ua.db.DeleteToken(ctx, oid.FromString(identity.Subject), oid.FromString(id))
        if err != nil {
                return errors.Wrap(err, "useradm: failed to delete token")
        }

        return nil
}

mendersoftware / useradm / 800583681

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