diff options
Diffstat (limited to 'lib/libc/posix1e/acl_from_text.c')
| -rw-r--r-- | lib/libc/posix1e/acl_from_text.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/lib/libc/posix1e/acl_from_text.c b/lib/libc/posix1e/acl_from_text.c new file mode 100644 index 0000000..a71bbca --- /dev/null +++ b/lib/libc/posix1e/acl_from_text.c @@ -0,0 +1,246 @@ +/*- + * Copyright (c) 1999 Robert N. M. Watson + * All rights reserved. + * + * 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. + * + * 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. + * + * $FreeBSD$ + */ +/* + * acl_from_text: convert a text-form ACL from a string to an acl_t + */ + +#include <sys/types.h> +#include <sys/acl.h> +#include <sys/errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "acl_support.h" + +enum PARSE_MODE { + PM_BASE, /* initial, begin line, or after , */ + PM_QUALIFIER, /* in qualifier field */ + PM_PERM, /* in permission field */ + PM_COMMENT, /* in comment */ +}; + +static char * +string_skip_whitespace(char *string) +{ + + while (*string && ((*string == ' ') || (*string == '\t'))) { + string++; + } + return (string); +} + +static void +string_trim_trailing_whitespace(char *string) +{ + char *end; + + if (*string == '\0') + return; + + end = string + strlen(string) - 1; + + while (end != string) { + if ((*end == ' ') || (*end == '\t')) { + *end = '\0'; + end--; + } else { + return; + } + } + + return; +} + +acl_tag_t +acl_string_to_tag(char *tag, char *qualifier) +{ + + if (*qualifier == '\0') { + if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) { + return (ACL_USER_OBJ); + } else + if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) { + return (ACL_GROUP_OBJ); + } else + if ((!strcmp(tag, "mask")) || (!strcmp(tag, "m"))) { + return (ACL_MASK); + } else + if ((!strcmp(tag, "other")) || (!strcmp(tag, "o"))) { + return (ACL_OTHER); + } else + return(-1); + } else { + if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) { + return(ACL_USER); + } else + if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) { + return(ACL_GROUP); + } else + return(-1); + } +} + +/* + * acl_from_text -- convert a string into an ACL + * postpone most validity checking until the end and cal acl_valid to do + * that. + */ +acl_t +acl_from_text(const char *buf_p) +{ + acl_tag_t t; + acl_perm_t p; + acl_t acl; + uid_t id; + char *mybuf_p, *line, *cur, *notcomment, *comment, *entry; + char *tag, *qualifier, *permission; + int error; + + /* local copy we can mess up */ + mybuf_p = strdup(buf_p); + if (!mybuf_p) { + errno = ENOMEM; + return(0); + } + + acl = acl_init(3); + if (!acl) { + free(mybuf_p); + errno = ENOMEM; + return(0); + } + + /* outer loop: delimit at \n boundaries */ + cur = mybuf_p; + while ((line = strsep(&cur, "\n"))) { + /* now split the line on the first # to strip out comments */ + comment = line; + notcomment = strsep(&comment, "#"); + + /* inner loop: delimit at , boundaries */ + while ((entry = strsep(¬comment, ","))) { + /* now split into three :-delimited fields */ + tag = strsep(&entry, ":"); + if (!tag) { + /* printf("no tag\n"); */ + errno = EINVAL; + goto error_label; + } + tag = string_skip_whitespace(tag); + if ((*tag == '\0') && (!entry)) { + /* + * is an entirely comment line, skip to next + * comma + */ + continue; + } + string_trim_trailing_whitespace(tag); + + qualifier = strsep(&entry, ":"); + if (!qualifier) { + /* printf("no qualifier\n"); */ + errno = EINVAL; + goto error_label; + } + qualifier = string_skip_whitespace(qualifier); + string_trim_trailing_whitespace(qualifier); + + permission = strsep(&entry, ":"); + if ((!permission) || (entry)) { + /* printf("no permission, or more stuff\n"); */ + errno = EINVAL; + goto error_label; + } + permission = string_skip_whitespace(permission); + string_trim_trailing_whitespace(permission); + + /* printf("[%s/%s/%s]\n", tag, qualifier, + permission); */ + + t = acl_string_to_tag(tag, qualifier); + if (t == -1) { + errno = EINVAL; + goto error_label; + } + + error = acl_string_to_perm(permission, &p); + if (error == -1) { + errno = EINVAL; + goto error_label; + } + + switch(t) { + case ACL_USER_OBJ: + case ACL_GROUP_OBJ: + case ACL_MASK: + case ACL_OTHER: + if (*qualifier != '\0') { + errno = EINVAL; + goto error_label; + } + id = 0; + break; + + case ACL_USER: + case ACL_GROUP: + error = acl_name_to_id(t, qualifier, &id); + if (error == -1) + goto error_label; + break; + + default: + errno = EINVAL; + goto error_label; + } + + error = acl_add_entry(acl, t, id, p); + if (error == -1) + goto error_label; + } + } + +#if 0 + /* XXX should we only return ACLs valid according to acl_valid? */ + /* verify validity of the ACL we read in */ + if (acl_valid(acl) == -1) { + errno = EINVAL; + goto error_label; + } +#endif + + return(acl); + +error_label: + acl_free(acl); + free(mybuf_p); + return(0); +} + + + |
