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Wed, 6 Apr 2022 13:58:04 +0200 (CEST) From: Oguz Bektas To: pve-devel@lists.proxmox.com Date: Wed, 6 Apr 2022 13:57:22 +0200 Message-Id: <20220406115734.898714-6-o.bektas@proxmox.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220406115734.898714-1-o.bektas@proxmox.com> References: <20220406115734.898714-1-o.bektas@proxmox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.386 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment POISEN_SPAM_PILL 0.1 Meta: its spam POISEN_SPAM_PILL_1 0.1 random spam to be learned in bayes POISEN_SPAM_PILL_3 0.1 random spam to be learned in bayes SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record T_SCC_BODY_TEXT_LINE -0.01 - Subject: [pve-devel] [PATCH v3 access-control 05/17] api: allow superusers to edit tfa and password settings X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Apr 2022 11:58:41 -0000 Signed-off-by: Oguz Bektas --- v2->v3: * added `has_superuser_anywhere` helper * only allow changing TFA or password settings of SUs if user has SU on /access endpoint src/PVE/API2/AccessControl.pm | 23 +++++++++++++++-------- src/PVE/API2/TFA.pm | 11 ++++++++++- src/PVE/RPCEnvironment.pm | 15 +++++++++++++++ 3 files changed, 40 insertions(+), 9 deletions(-) diff --git a/src/PVE/API2/AccessControl.pm b/src/PVE/API2/AccessControl.pm index 5d78c6f..4ba9dc5 100644 --- a/src/PVE/API2/AccessControl.pm +++ b/src/PVE/API2/AccessControl.pm @@ -378,17 +378,24 @@ __PACKAGE__->register_method ({ $rpcenv->check_user_exist($userid); + my $is_superuser = $rpcenv->check($authuser, "/access", ['SuperUser'], 1); + if ($authuser eq 'root@pam') { # OK - root can change anything + } elsif ($authuser eq $userid) { + $rpcenv->check_user_enabled($userid); + # OK - each user can change its own password } else { - if ($authuser eq $userid) { - $rpcenv->check_user_enabled($userid); - # OK - each user can change its own password - } else { - # only root may change root password - raise_perm_exc() if $userid eq 'root@pam'; - # do not allow to change system user passwords - raise_perm_exc() if $realm eq 'pam'; + # only root may change root password + raise_perm_exc() if $userid eq 'root@pam'; + # do not allow to change system user passwords + raise_perm_exc() if $realm eq 'pam'; + + if ($is_superuser) { + # OK - superusers can change any user's password except root@pam + } elsif ($rpcenv->has_superuser_anywhere($userid)) { + die "only superusers can change another superuser's password!\n" + if !$is_superuser; } } diff --git a/src/PVE/API2/TFA.pm b/src/PVE/API2/TFA.pm index bee4dee..d7c0c4d 100644 --- a/src/PVE/API2/TFA.pm +++ b/src/PVE/API2/TFA.pm @@ -96,22 +96,31 @@ my $TFA_UPDATE_INFO_SCHEMA = { }; # Only root may modify root, regular users need to specify their password. +# Only users with SU on /access may modify other users with SU anywhere # # Returns the userid returned from `verify_username`. # Or ($userid, $realm) in list context. my sub root_permission_check : prototype($$$$) { my ($rpcenv, $authuser, $userid, $password) = @_; + # authuser = the user making the change + # userid = the user to be changed + raise_perm_exc() if $userid eq 'root@pam' && $authuser ne 'root@pam'; # can be only edited by itself ($userid, undef, my $realm) = PVE::AccessControl::verify_username($userid); $rpcenv->check_user_exist($userid); - raise_perm_exc() if $userid eq 'root@pam' && $authuser ne 'root@pam'; + my $is_superuser = $rpcenv->check($authuser, "/access", ['SuperUser'], 1); # Regular users need to confirm their password to change TFA settings. if ($authuser ne 'root@pam') { raise_param_exc({ 'password' => 'password is required to modify TFA data' }) if !defined($password); + if (!$is_superuser && $authuser ne $userid) { + die "only superusers can change another superuser's TFA settings!\n" + if $rpcenv->has_superuser_anywhere($userid); + } + ($authuser, my $auth_username, my $auth_realm) = PVE::AccessControl::verify_username($authuser); diff --git a/src/PVE/RPCEnvironment.pm b/src/PVE/RPCEnvironment.pm index 34c8991..04c5633 100644 --- a/src/PVE/RPCEnvironment.pm +++ b/src/PVE/RPCEnvironment.pm @@ -479,6 +479,21 @@ sub check_api2_permissions { raise_perm_exc(); } +sub has_superuser_anywhere { + my ($self, $username) = @_; + + return 1 if $username eq 'root@pam'; + + # get all ACL paths from config and check for SU privilege + my $acls = $self->{user_cfg}->{acl}; + my @acl_paths = keys(%$acls); + @acl_paths = ['/'] if !@acl_paths; + foreach my $path (@acl_paths) { + return 1 if $self->check($username, $path, ['SuperUser'], 1); + } + return 0; +} + sub log_cluster_msg { my ($self, $pri, $user, $msg) = @_; -- 2.30.2