[PATCH ghau93 v1] add support to filter on sockaddr family

[Steve Grubb]

On Friday, April 26, 2019 12:59:45 PM EDT Richard Guy Briggs wrote:
> Provide a method to filter on network address family.
> 
> This adds support for the kernel filter for sockaddr family,
> AUDIT_SADDR_FAM, adding the command line option "saddr_fam" to auditctl.
> 
> See: https://github.com/linux-audit/audit-kernel/issues/64
> See: https://github.com/linux-audit/audit-userspace/issues/93
> 
> Signed-off-by: Richard Guy Briggs <rgb at redhat.com>

Applied.

Thanks,
-Steve


> ---
>  lib/errormsg.h | 2 ++
>  lib/fieldtab.h | 1 +
>  lib/libaudit.c | 6 ++++++
>  lib/libaudit.h | 3 +++
>  4 files changed, 12 insertions(+)
> 
> diff --git a/lib/errormsg.h b/lib/errormsg.h
> index fd8c4a4b1311..fc03b2475034 100644
> --- a/lib/errormsg.h
> +++ b/lib/errormsg.h
> @@ -70,6 +70,7 @@ struct msg_tab {
>  #define EAU_FIELDUNAVAIL	34
>  #define EAU_FILTERNOSUPPORT	35
>  #define EAU_FSTYPEUNKNOWN	36
> +#define EAU_FIELDVALTOOBIG	37
>  static const struct msg_tab err_msgtab[] = {
>      { -EAU_OPMISSING,		2, "-F missing operation for" },
>      { -EAU_FIELDUNKNOWN,	2, "-F unknown field:" },
> @@ -107,5 +108,6 @@ static const struct msg_tab err_msgtab[] = {
>      { -EAU_FIELDUNAVAIL,	1, "field is not valid for the filter" },
>      { -EAU_FILTERNOSUPPORT,	1, "filter is not supported by the kernel" },
>      { -EAU_FSTYPEUNKNOWN,	2, "file system type is unknown for field:" },
> +    { -EAU_FIELDVALTOOBIG,	2, "value is too large for field:" },
>  };
>  #endif
> diff --git a/lib/fieldtab.h b/lib/fieldtab.h
> index c425d5b86049..b597cafb2df8 100644
> --- a/lib/fieldtab.h
> +++ b/lib/fieldtab.h
> @@ -69,3 +69,4 @@ _S(AUDIT_ARG3,         "a3"           )
> 
>  _S(AUDIT_FILTERKEY,    "key"          )
>  _S(AUDIT_EXE,          "exe"          )
> +_S(AUDIT_SADDR_FAM,    "saddr_fam"    )
> diff --git a/lib/libaudit.c b/lib/libaudit.c
> index 2af017a0e520..2e4b148edde9 100644
> --- a/lib/libaudit.c
> +++ b/lib/libaudit.c
> @@ -40,6 +40,7 @@
>  #include <limits.h>	/* for PATH_MAX */
>  #include <sys/stat.h>
>  #include <sys/types.h>
> +#include <sys/socket.h> /* AF_MAX */
>  #ifdef HAVE_LIBCAP_NG
>  #include <cap-ng.h>
>  #endif
> @@ -1742,6 +1743,11 @@ int audit_rule_fieldpair_data(struct audit_rule_data
> **rulep, const char *pair, else if (strcmp(v, "unset") == 0)
>  				rule->values[rule->field_count] = 4294967295;
>  			break;
> +		case AUDIT_SADDR_FAM:
> +			rule->values[rule->field_count] = strtoul(v, NULL, 0);
> +			if (rule->values[rule->field_count] >= AF_MAX)
> +				return -EAU_FIELDVALTOOBIG;
> +			break;
>  		case AUDIT_DEVMAJOR...AUDIT_INODE:
>  		case AUDIT_SUCCESS:
>  			if (flags != AUDIT_FILTER_EXIT)
> diff --git a/lib/libaudit.h b/lib/libaudit.h
> index 77e4142beea2..89fe4839a69b 100644
> --- a/lib/libaudit.h
> +++ b/lib/libaudit.h
> @@ -356,6 +356,9 @@ extern "C" {
>  #ifndef AUDIT_EXE
>  #define AUDIT_EXE 112
>  #endif
> +#ifndef AUDIT_SADDR_FAM
> +#define AUDIT_SADDR_FAM 113
> +#endif
> 
>  #ifndef AUDIT_SESSIONID
>  #define AUDIT_SESSIONID 25