134 lines
5.1 KiB
C
134 lines
5.1 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
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*
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* Copyright (C) 2017 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef GDM_PAM_EXTENSIONS_COMMON_H
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#define GDM_PAM_EXTENSIONS_COMMON_H
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#include <alloca.h>
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#include <endian.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <limits.h>
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#include <security/pam_appl.h>
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typedef struct {
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uint32_t length;
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unsigned char type;
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unsigned char data[];
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} GdmPamExtensionMessage;
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#define GDM_PAM_EXTENSION_MESSAGE_FROM_PAM_MESSAGE(query) (GdmPamExtensionMessage *) (void *) query->msg
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#define GDM_PAM_EXTENSION_MESSAGE_TO_PAM_REPLY(msg) (char *) (void *) msg
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#define GDM_PAM_EXTENSION_MESSAGE_TO_BINARY_PROMPT_MESSAGE(extended_message, binary_message) \
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{ \
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(binary_message)->msg_style = PAM_BINARY_PROMPT; \
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(binary_message)->msg = (void *) extended_message; \
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}
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#define GDM_PAM_EXTENSION_MESSAGE_TRUNCATED(msg) be32toh(msg->length) < sizeof (GdmPamExtensionMessage)
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#define GDM_PAM_EXTENSION_MESSAGE_INVALID_TYPE(msg) \
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({ \
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bool _invalid = true; \
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int _n = -1; \
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const char *_supported_extensions; \
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_supported_extensions = getenv ("GDM_SUPPORTED_PAM_EXTENSIONS"); \
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if (_supported_extensions != NULL) { \
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const char *_p = _supported_extensions; \
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while (*_p != '\0' && _n < UCHAR_MAX) { \
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size_t _length; \
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_length = strcspn (_p, " "); \
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if (_length > 0) \
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_n++; \
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_p += _length; \
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_length = strspn (_p, " "); \
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_p += _length; \
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} \
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if (_n >= msg->type) \
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_invalid = false; \
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} \
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_invalid; \
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})
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#define GDM_PAM_EXTENSION_MESSAGE_MATCH(msg, supported_extensions, name) (strcmp (supported_extensions[msg->type], name) == 0)
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/* environment block should be a statically allocated chunk of memory. This is important because
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* putenv() will leak otherwise (and setenv isn't thread safe)
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*/
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#define GDM_PAM_EXTENSION_ADVERTISE_SUPPORTED_EXTENSIONS(environment_block, supported_extensions) \
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{ \
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size_t _size = 0; \
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unsigned char _t, _num_chunks; \
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char *_p; \
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_p = environment_block; \
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_p = stpncpy (_p, "GDM_SUPPORTED_PAM_EXTENSIONS", sizeof(environment_block)); \
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*_p = '\0'; \
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_size += strlen (environment_block); \
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for (_t = 0; supported_extensions[_t] != NULL && _t < UCHAR_MAX; _t++) {\
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size_t _next_chunk = strlen (supported_extensions[_t]) + strlen (" "); \
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if (_size + _next_chunk >= sizeof (environment_block)) \
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break; \
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_size += _next_chunk; \
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}\
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_num_chunks = _t; \
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if (_t != 0) { \
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_p = stpcpy (_p, "="); \
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for (_t = 0; _t < _num_chunks; _t++) { \
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if (_t != 0) \
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_p = stpcpy (_p, " "); \
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_p = stpcpy (_p, supported_extensions[_t]); \
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} \
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*_p = '\0'; \
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putenv (environment_block); \
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} \
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}
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#define GDM_PAM_EXTENSION_LOOK_UP_TYPE(name, extension_type) \
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({ \
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bool _supported = false; \
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unsigned char _t = 0; \
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const char *_supported_extensions; \
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_supported_extensions = getenv ("GDM_SUPPORTED_PAM_EXTENSIONS"); \
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if (_supported_extensions != NULL) { \
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const char *_p = _supported_extensions; \
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while (*_p != '\0') { \
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size_t _length; \
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_length = strcspn (_p, " "); \
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if (strncmp (_p, name, _length) == 0) { \
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_supported = true; \
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break; \
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} \
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_p += _length; \
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_length = strspn (_p, " "); \
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_p += _length; \
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if (_t >= UCHAR_MAX) { \
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break; \
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} \
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_t++; \
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} \
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if (_supported && extension_type != NULL) \
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*extension_type = _t; \
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} \
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_supported; \
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})
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#define GDM_PAM_EXTENSION_SUPPORTED(name) GDM_PAM_EXTENSION_LOOK_UP_TYPE(name, (unsigned char *) NULL)
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#endif
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