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Wed, 17 Jan 2024 14:25:40 +0100 Received: from app-degfx-vy1.fhm.de (app-degfx-vy1.fhm.de [172.22.145.38]) by smtpgwint1.fhm.de (8.14.7/8.14.7) with ESMTP id 40HDPe4a028484; Wed, 17 Jan 2024 14:25:40 +0100 From: Florian Schwalm To: CC: Florian Schwalm Subject: [PATCH 1/1] cifs.upcall: enable ccache init from keytab for multiuser mount sessions Date: Wed, 17 Jan 2024 14:25:34 +0100 Message-ID: <20240117132534.2623424-2-Florian.Schwalm@seven.one> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240117132534.2623424-1-Florian.Schwalm@seven.one> References: <20240117132534.2623424-1-Florian.Schwalm@seven.one> Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AMS1EPF00000047:EE_|FR3P281MB3055:EE_ X-MS-Office365-Filtering-Correlation-Id: 7df86924-7d2c-40e4-0f3d-08dc175fce65 X-MS-Exchange-AtpMessageProperties: SA X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: seven.one X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jan 2024 13:25:43.1516 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7df86924-7d2c-40e4-0f3d-08dc175fce65 X-MS-Exchange-CrossTenant-Id: 3825a6f3-24cb-47d4-8aa2-35d3e5891324 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3825a6f3-24cb-47d4-8aa2-35d3e5891324;Ip=[81.93.117.34];Helo=[mail.p7s1.net] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF00000047.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: FR3P281MB3055 Initializing the credentials cache from the provided keytab relies on the username/principal to be known. The kernel doesn't pass down a username for the individual user sessions of a multiuser mount, though, we only get a uid. This patch adds derival of a missing username based on the uid just as is already done for the gid. This way the keytab can also be used for initialization of user sessions. Signed-off-by: Florian Schwalm --- cifs.upcall.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/cifs.upcall.c b/cifs.upcall.c index 52c0328..492fcb6 100644 --- a/cifs.upcall.c +++ b/cifs.upcall.c @@ -1515,6 +1515,21 @@ int main(const int argc, char *const argv[]) goto out; } + /* + * The kernel doesn't pass down the username for individual sessions + * of a multiuser mount, so we resort here to scraping one + * out of the passwd nss db. + */ + if(arg->username[0] == '\0') { + if (strlen(pw->pw_name) > sizeof(arg->username)-1) { + syslog(LOG_ERR, "pw_name value too long for buffer"); + } else { + memset(arg->username, 0, sizeof(arg->username)); + strncpy(arg->username, pw->pw_name, strlen(pw->pw_name)); + syslog(LOG_DEBUG, "Added username derived from uid:%s", arg->username); + } + } + ccache = get_existing_cc(env_cachename); /* Couldn't find credcache? Try to use keytab */ if (ccache == NULL && arg->username[0] != '\0')