commit 17a3f6715591b215a7fdd3127db4abe70ff26381 Author: Tomas Mraz tmraz@fedoraproject.org Date: Thu Jan 26 14:50:51 2012 +0100
Do not unmount anything by default in pam_namespace close session call.
* modules/pam_namespace/pam_namespace.c (pam_sm_close_session): Recognize the unmount_on_close option and make the default to be to not unmount. * modules/pam_namespace/pam_namespace.h: Rename PAMNS_NO_UNMOUNT_ON_CLOSE to PAMNS_UNMOUNT_ON_CLOSE. * modules/pam_namespace/pam_namespace.8.xml: Document the change.
modules/pam_namespace/pam_namespace.8.xml | 17 +++++++++-------- modules/pam_namespace/pam_namespace.c | 24 +++++++++++++----------- modules/pam_namespace/pam_namespace.h | 2 +- 3 files changed, 23 insertions(+), 20 deletions(-) --- diff --git a/modules/pam_namespace/pam_namespace.8.xml b/modules/pam_namespace/pam_namespace.8.xml index 6ec3ad2..f0f80d3 100644 --- a/modules/pam_namespace/pam_namespace.8.xml +++ b/modules/pam_namespace/pam_namespace.8.xml @@ -44,7 +44,7 @@ ignore_instance_parent_mode </arg> <arg choice="opt"> - no_unmount_on_close + unmount_on_close </arg> <arg choice="opt"> use_current_context @@ -195,16 +195,17 @@
<varlistentry> <term> - <option>no_unmount_on_close</option> + <option>unmount_on_close</option> </term> <listitem> <para> - For certain trusted programs such as newrole, open session - is called from a child process while the parent performs - close session and pam end functions. For these commands - use this option to instruct pam_close_session to not - unmount the bind mounted polyinstantiated directory in the - parent. + Explicitly unmount the polyinstantiated directories instead + of relying on automatic namespace destruction after the last + process in a namespace exits. This option should be used + only in case it is ensured by other means that there cannot be + any processes running in the private namespace left after the + session close. It is also useful only in case there are + multiple pam session calls in sequence from the same process. </para> </listitem> </varlistentry> diff --git a/modules/pam_namespace/pam_namespace.c b/modules/pam_namespace/pam_namespace.c index 470f493..a40f05e 100644 --- a/modules/pam_namespace/pam_namespace.c +++ b/modules/pam_namespace/pam_namespace.c @@ -2108,24 +2108,26 @@ PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED, idata.flags |= PAMNS_DEBUG; if (strcmp(argv[i], "ignore_config_error") == 0) idata.flags |= PAMNS_IGN_CONFIG_ERR; - if (strcmp(argv[i], "no_unmount_on_close") == 0) - idata.flags |= PAMNS_NO_UNMOUNT_ON_CLOSE; + if (strcmp(argv[i], "unmount_on_close") == 0) + idata.flags |= PAMNS_UNMOUNT_ON_CLOSE; }
if (idata.flags & PAMNS_DEBUG) pam_syslog(idata.pamh, LOG_DEBUG, "close_session - start");
/* - * For certain trusted programs such as newrole, open session - * is called from a child process while the parent perfoms - * close session and pam end functions. For these commands - * pam_close_session should not perform the unmount of the - * polyinstantiatied directory because it will result in - * undoing of parents polyinstantiatiaion. These commands - * will invoke pam_namespace with the "no_unmount_on_close" - * argument. + * Normally the unmount is implicitly done when the last + * process in the private namespace exits. + * If it is ensured that there are no child processes left in + * the private namespace by other means and if there are + * multiple sessions opened and closed sequentially by the + * same process, the "unmount_on_close" option might be + * used to unmount the polydirs explicitly. */ - if (idata.flags & PAMNS_NO_UNMOUNT_ON_CLOSE) { + if (!(idata.flags & PAMNS_UNMOUNT_ON_CLOSE)) { + pam_set_data(idata.pamh, NAMESPACE_POLYDIR_DATA, NULL, NULL); + pam_set_data(idata.pamh, NAMESPACE_PROTECT_DATA, NULL, NULL); + if (idata.flags & PAMNS_DEBUG) pam_syslog(idata.pamh, LOG_DEBUG, "close_session - sucessful"); return PAM_SUCCESS; diff --git a/modules/pam_namespace/pam_namespace.h b/modules/pam_namespace/pam_namespace.h index 6bca31c..1d0c11c 100644 --- a/modules/pam_namespace/pam_namespace.h +++ b/modules/pam_namespace/pam_namespace.h @@ -101,7 +101,7 @@ #define PAMNS_GEN_HASH 0x00002000 /* Generate md5 hash for inst names */ #define PAMNS_IGN_CONFIG_ERR 0x00004000 /* Ignore format error in conf file */ #define PAMNS_IGN_INST_PARENT_MODE 0x00008000 /* Ignore instance parent mode */ -#define PAMNS_NO_UNMOUNT_ON_CLOSE 0x00010000 /* no unmount at session close */ +#define PAMNS_UNMOUNT_ON_CLOSE 0x00010000 /* Unmount at session close */ #define PAMNS_USE_CURRENT_CONTEXT 0x00020000 /* use getcon instead of getexeccon */ #define PAMNS_USE_DEFAULT_CONTEXT 0x00040000 /* use get_default_context instead of getexeccon */ #define PAMNS_MOUNT_PRIVATE 0x00080000 /* Make the polydir mounts private */