diff options
Diffstat (limited to 'drivers/auth/img_parser_mod.c')
| -rw-r--r-- | drivers/auth/img_parser_mod.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/auth/img_parser_mod.c b/drivers/auth/img_parser_mod.c new file mode 100644 index 00000000..c8cbe340 --- /dev/null +++ b/drivers/auth/img_parser_mod.c @@ -0,0 +1,151 @@ +/* + * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <assert.h> +#include <auth_common.h> +#include <debug.h> +#include <errno.h> +#include <img_parser_mod.h> +#include <limits.h> +#include <stdint.h> +#include <string.h> + +extern uintptr_t __PARSER_LIB_DESCS_START__; +extern uintptr_t __PARSER_LIB_DESCS_END__; +#define PARSER_LIB_DESCS_START ((uintptr_t) (&__PARSER_LIB_DESCS_START__)) +#define PARSER_LIB_DESCS_END ((uintptr_t) (&__PARSER_LIB_DESCS_END__)) +static unsigned int parser_lib_indices[IMG_MAX_TYPES]; +static img_parser_lib_desc_t *parser_lib_descs; + +#define INVALID_IDX UINT_MAX + +static void validate_desc(img_parser_lib_desc_t *desc) +{ + assert(desc != NULL); + assert(desc->init != NULL); + assert(desc->name != NULL); + assert(desc->check_integrity != NULL); + assert(desc->get_auth_param != NULL); +} + +void img_parser_init(void) +{ + unsigned int index, mod_num; + + /* Initialise internal variables to invalid state */ + for (index = 0; index < IMG_MAX_TYPES; index++) { + parser_lib_indices[index] = INVALID_IDX; + } + + /* Calculate how many image parsers are registered. At least one parser + * must be present */ + mod_num = PARSER_LIB_DESCS_END - PARSER_LIB_DESCS_START; + mod_num /= sizeof(img_parser_lib_desc_t); + assert(mod_num > 0); + + parser_lib_descs = (img_parser_lib_desc_t *) PARSER_LIB_DESCS_START; + for (index = 0; index < mod_num; index++) { + + /* Check that the image parser library descriptor is valid */ + validate_desc(&parser_lib_descs[index]); + + /* Initialize image parser */ + parser_lib_descs[index].init(); + + /* Ensure only one parser is registered for each image type */ + assert(parser_lib_indices[parser_lib_descs[index].img_type] == + INVALID_IDX); + + /* Keep the index of this hash calculator */ + parser_lib_indices[parser_lib_descs[index].img_type] = index; + } +} + +int img_parser_check_integrity(img_type_t img_type, + void *img_ptr, unsigned int img_len) +{ + unsigned int idx; + + assert(img_ptr != NULL); + assert(img_len != 0); + + /* No integrity checks on raw images */ + if (img_type == IMG_RAW) { + return IMG_PARSER_OK; + } + + /* Find the index of the required image parser */ + idx = parser_lib_indices[img_type]; + assert(idx != INVALID_IDX); + + /* Call the function to check the image integrity */ + return parser_lib_descs[idx].check_integrity(img_ptr, img_len); +} + +/* + * Extract an authentication parameter from an image + * + * Parameters: + * img_type: image type (certificate, raw image, etc) + * type_desc: provides info to obtain the parameter + * img_ptr: pointer to image data + * img_len: image length + * param_ptr: [out] stores a pointer to the parameter + * param_len: [out] stores the length of the parameter + */ +int img_parser_get_auth_param(img_type_t img_type, + const auth_param_type_desc_t *type_desc, + void *img_ptr, unsigned int img_len, + void **param_ptr, unsigned int *param_len) +{ + unsigned int idx; + + assert(type_desc != NULL); + assert(img_ptr != NULL); + assert(img_len != 0); + assert(param_ptr != NULL); + assert(param_len != NULL); + + /* In a raw image we can only get the data itself */ + if (img_type == IMG_RAW) { + assert(type_desc->type == AUTH_PARAM_RAW_DATA); + *param_ptr = img_ptr; + *param_len = img_len; + return IMG_PARSER_OK; + } + + /* Find the index of the required image parser library */ + idx = parser_lib_indices[img_type]; + assert(idx != INVALID_IDX); + + /* Call the function to obtain the parameter */ + return parser_lib_descs[idx].get_auth_param(type_desc, img_ptr, img_len, + param_ptr, param_len); +} |