[SSSD] [PATCH] PAM: close socket fd with pam_set_data

Simo Sorce simo at redhat.com
Thu Oct 11 13:30:29 UTC 2012


On Thu, 2012-10-11 at 10:00 +0200, Jakub Hrozek wrote:
> From 98c8a6b92db2872083473b4ce0761bffc919e847 Mon Sep 17 00:00:00 2001
> From: Jakub Hrozek <jhrozek at redhat.com>
> Date: Thu, 4 Oct 2012 19:08:08 +0200
> Subject: [PATCH] PAM: close socket fd with pam_set_data
> 
> https://fedorahosted.org/sssd/ticket/1569
> ---
>  src/sss_client/common.c  |  6 ++++++
>  src/sss_client/pam_sss.c | 26 ++++++++++++++++++++++++++
>  src/sss_client/sss_cli.h |  2 ++
>  3 files changed, 34 insertions(+)
> 
> diff --git a/src/sss_client/common.c b/src/sss_client/common.c
> index
> 1ef3ba15e5a86952a05de29c9db212fc829111bc..a4d523cdf45665c2e1b4984cc9b6db14c3d05340 100644
> --- a/src/sss_client/common.c
> +++ b/src/sss_client/common.c
> @@ -794,6 +794,12 @@ errno_t check_server_cred(int sockfd)
>  #endif
>      return 0;
>  }
> +
> +int *sss_pam_get_socket(void)
> +{
> +    return &sss_cli_sd;
> +}
> +
>  int sss_pam_make_request(enum sss_cli_command cmd,
>                        struct sss_cli_req_data *rd,
>                        uint8_t **repbuf, size_t *replen,
> diff --git a/src/sss_client/pam_sss.c b/src/sss_client/pam_sss.c
> index
> efbc48b6ef0458bb79dad53f81c584611f2be22d..92c90742e1931cf063a769a13befa8ec3567969a 100644
> --- a/src/sss_client/pam_sss.c
> +++ b/src/sss_client/pam_sss.c
> @@ -54,6 +54,7 @@
>  #define FLAGS_USE_AUTHTOK    (1 << 2)
>  
>  #define PWEXP_FLAG "pam_sss:password_expired_flag"
> +#define FD_DESTRUCTOR "pam_sss:fd_destructor"
>  
>  #define PW_RESET_MSG_FILENAME_TEMPLATE SSSD_CONF_DIR"/customize/%
> s/pam_sss_pw_reset_message.%s"
>  #define PW_RESET_MSG_MAX_SIZE 4096
> @@ -122,6 +123,24 @@ static void free_exp_data(pam_handle_t *pamh,
> void *ptr, int err)
>      ptr = NULL;
>  }
>  
> +static void close_fd(pam_handle_t *pamh, void *ptr, int err)
> +{
> +    int fd = *((int *) ptr);
> +
> +    if (err & PAM_DATA_REPLACE) {
> +        /* Nothing to do */
> +        return;
> +    }
> +
> +    if (fd == -1) {
> +        /* fd not yet initialized */
> +        return;
> +    }
> +
> +    D(("Closing the fd"));
> +    close(fd);
> +}

NACK, ^^^^^^^^^
you are closing the fd and leaving sss_cli_sd untouched, which means it
will still point to a random file descriptor.

Also I do not understand why this whole dance in passing pointers and
the sss_pam_get_socket() function, seem all very unnecessary.
.
sss_cli_sd is a global variable which means:
a) you can access it directly
b) you need mutexes to access it (see sss_pam_make_request()).

Simo.
 
-- 
Simo Sorce * Red Hat, Inc * New York




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