diff options
Diffstat (limited to 'lib/libc/posix1e/mac_biba.c')
| -rw-r--r-- | lib/libc/posix1e/mac_biba.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/lib/libc/posix1e/mac_biba.c b/lib/libc/posix1e/mac_biba.c new file mode 100644 index 0000000..7d32480 --- /dev/null +++ b/lib/libc/posix1e/mac_biba.c @@ -0,0 +1,218 @@ +/* + * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson + * Copyright (c) 2002 Networks Associates Technology, Inc. + * All rights reserved. + * + * This software was developed by Robert Watson for the TrustedBSD Project. + * + * This software was developed for the FreeBSD Project in part by NAI Labs, + * the Security Research Division of Network Associates, Inc. under + * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA + * CHATS research program. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 3. The names of the authors may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $FreeBSD$ + */ + +#include <sys/types.h> +#include <sys/mac.h> + +#include <security/mac_biba/mac_biba.h> + +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +/* + * Biba labels take the following format: + * [optional bibasingle][optional bibarange] + * bibasingle: {low,0-65535,high,equal} + * bibarange: ([bibasingle]-[bibasingle]) + */ + +/* + * Extract mac_biba_element contents from a string. + */ +static int +mac_biba_element_from_string(char *string, struct mac_biba_element *element) +{ + unsigned long value; + char *endp; + int error; + + if (strcmp(string, "low") == 0) { + element->mbe_type = MAC_BIBA_TYPE_LOW; + element->mbe_grade = 0; + error = 0; + } else if (strcmp(string, "high") == 0) { + element->mbe_type = MAC_BIBA_TYPE_HIGH; + element->mbe_grade = 0; + error = 0; + } else if (strcmp(string, "equal") == 0) { + element->mbe_type = MAC_BIBA_TYPE_EQUAL; + element->mbe_grade = 0; + error = 0; + } else { + value = strtoul(string, &endp, 10); + if (*endp == '\0' && value == (u_short) value) { + element->mbe_type = MAC_BIBA_TYPE_GRADE; + element->mbe_grade = value; + error = 0; + } else + error = EINVAL; + } + + return (error); +} + +/* + * Destructively convert a string into a mac_biba. + */ +int +mac_biba_label_from_string(char *string, struct mac *label) +{ + char *string_single, *string_rangelow, *string_rangehigh; + int error; + + bzero(&label->m_biba, sizeof(label->m_biba)); + + /* + * Is a '(' present?, if so check for last character of ')', and + * split into single and range strings after nulling the '(' and + * ')'. Reject if appropriate. + */ + + string_single = strsep(&string, "("); + if (*string_single == '\0' && string == NULL) { + /* No interesting elements to parse, flags already zero'd. */ + return (0); + } + if (string != NULL) { + /* If a '(' was present, last character must be ')'. */ + if (*string == '\0') + return (EINVAL); + if (string[strlen(string)-1] != ')') + return (EINVAL); + string[strlen(string)-1] = '\0'; + } + + /* + * If range is present, split range into rangelow and rangehigh + * based on '-', if present, and nul it. Process range elements. + * Reject if appropriate. + */ + if (string != NULL) { + string_rangehigh = string; + string_rangelow = strsep(&string_rangehigh, "-"); + if (*string_rangelow == '\0' || string_rangehigh == NULL) + return (EINVAL); + error = mac_biba_element_from_string(string_rangelow, + &label->m_biba.mb_rangelow); + if (error) + return (error); + error = mac_biba_element_from_string(string_rangehigh, + &label->m_biba.mb_rangehigh); + if (error) + return (error); + label->m_biba.mb_flags |= MAC_BIBA_FLAG_RANGE; + } + + /* + * If single is present, process single and reject if needed. + */ + if (*string_single != '\0') { + error = mac_biba_element_from_string(string_single, + &label->m_biba.mb_single); + if (error) + return (error); + label->m_biba.mb_flags |= MAC_BIBA_FLAG_SINGLE; + } + + return (0); +} + +static char * +mac_biba_string_from_element(struct mac_biba_element *element) +{ + char *string; + + switch(element->mbe_type) { + case MAC_BIBA_TYPE_LOW: + return (strdup("low")); + + case MAC_BIBA_TYPE_HIGH: + return (strdup("high")); + + case MAC_BIBA_TYPE_EQUAL: + return (strdup("equal")); + + case MAC_BIBA_TYPE_GRADE: + asprintf(&string, "%d", element->mbe_grade); + return (string); + + default: + return (strdup("invalid")); + } +} + +char * +mac_biba_string_from_label(struct mac *label) +{ + char *format_string = NULL; + char *string = NULL, *string_single = NULL, *string_rangelow = NULL; + char *string_rangehigh = NULL; + + if (label->m_biba.mb_flags & MAC_BIBA_FLAG_SINGLE) { + string_single = mac_biba_string_from_element( + &label->m_biba.mb_single); + } + if (label->m_biba.mb_flags & MAC_BIBA_FLAG_RANGE) { + string_rangelow = mac_biba_string_from_element( + &label->m_biba.mb_rangelow); + string_rangehigh = mac_biba_string_from_element( + &label->m_biba.mb_rangehigh); + } + + if (string_rangelow && string_single) { + asprintf(&string, "%s(%s-%s)", string_single, string_rangelow, + string_rangehigh); + } else if (string_rangelow) { + asprintf(&string, "(%s-%s)", string_rangelow, + string_rangehigh); + } else if (string_single) { + asprintf(&string, "%s", string_single); + } else + string = strdup(""); + + if (string_single) + free(string_single); + if (string_rangelow) + free(string_rangelow); + if (string_rangehigh) + free(string_rangehigh); + + return (string); +} |
