Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Generalized labeling frontend for userspace object managers. |
| 3 | * |
| 4 | * Author : Eamon Walsh <ewalsh@epoch.ncsc.mil> |
| 5 | */ |
| 6 | |
| 7 | #include <sys/types.h> |
| 8 | #include <ctype.h> |
| 9 | #include <errno.h> |
| 10 | #include <stdio.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <string.h> |
| 13 | #include <selinux/selinux.h> |
| 14 | #include "callbacks.h" |
| 15 | #include "label_internal.h" |
| 16 | |
| 17 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
| 18 | |
| 19 | typedef int (*selabel_initfunc)(struct selabel_handle *rec, |
Stephen Smalley | a2e47cd | 2012-06-11 13:35:34 -0400 | [diff] [blame] | 20 | const struct selinux_opt *opts, |
| 21 | unsigned nopts); |
Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 22 | |
| 23 | static selabel_initfunc initfuncs[] = { |
| 24 | &selabel_file_init, |
Stephen Smalley | 35b0108 | 2012-04-04 10:06:13 -0400 | [diff] [blame] | 25 | NULL, |
| 26 | NULL, |
| 27 | NULL, |
| 28 | &selabel_property_init, |
Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 29 | }; |
| 30 | |
| 31 | /* |
| 32 | * Validation functions |
| 33 | */ |
| 34 | |
Stephen Smalley | a2e47cd | 2012-06-11 13:35:34 -0400 | [diff] [blame] | 35 | static inline int selabel_is_validate_set(const struct selinux_opt *opts, |
| 36 | unsigned n) |
Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 37 | { |
| 38 | while (n--) |
| 39 | if (opts[n].type == SELABEL_OPT_VALIDATE) |
| 40 | return !!opts[n].value; |
| 41 | |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | int selabel_validate(struct selabel_handle *rec, |
| 46 | struct selabel_lookup_rec *contexts) |
| 47 | { |
| 48 | int rc = 0; |
| 49 | |
| 50 | if (!rec->validating || contexts->validated) |
| 51 | goto out; |
| 52 | |
| 53 | rc = selinux_validate(&contexts->ctx_raw); |
| 54 | if (rc < 0) |
| 55 | goto out; |
| 56 | |
| 57 | contexts->validated = 1; |
| 58 | out: |
| 59 | return rc; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * Public API |
| 64 | */ |
| 65 | |
| 66 | struct selabel_handle *selabel_open(unsigned int backend, |
Stephen Smalley | a2e47cd | 2012-06-11 13:35:34 -0400 | [diff] [blame] | 67 | const struct selinux_opt *opts, |
| 68 | unsigned nopts) |
Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 69 | { |
| 70 | struct selabel_handle *rec = NULL; |
| 71 | |
| 72 | if (backend >= ARRAY_SIZE(initfuncs)) { |
| 73 | errno = EINVAL; |
| 74 | goto out; |
| 75 | } |
| 76 | |
Stephen Smalley | 35b0108 | 2012-04-04 10:06:13 -0400 | [diff] [blame] | 77 | if (initfuncs[backend] == NULL) |
| 78 | goto out; |
| 79 | |
Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 80 | rec = (struct selabel_handle *)malloc(sizeof(*rec)); |
| 81 | if (!rec) |
| 82 | goto out; |
| 83 | |
| 84 | memset(rec, 0, sizeof(*rec)); |
| 85 | rec->backend = backend; |
| 86 | rec->validating = selabel_is_validate_set(opts, nopts); |
| 87 | |
| 88 | if ((*initfuncs[backend])(rec, opts, nopts)) { |
| 89 | free(rec); |
| 90 | rec = NULL; |
| 91 | } |
| 92 | |
| 93 | out: |
| 94 | return rec; |
| 95 | } |
| 96 | |
| 97 | static struct selabel_lookup_rec * |
| 98 | selabel_lookup_common(struct selabel_handle *rec, int translating, |
| 99 | const char *key, int type) |
| 100 | { |
| 101 | struct selabel_lookup_rec *lr; |
| 102 | lr = rec->func_lookup(rec, key, type); |
| 103 | if (!lr) |
| 104 | return NULL; |
| 105 | |
| 106 | return lr; |
| 107 | } |
| 108 | |
| 109 | int selabel_lookup(struct selabel_handle *rec, security_context_t *con, |
| 110 | const char *key, int type) |
| 111 | { |
| 112 | struct selabel_lookup_rec *lr; |
| 113 | |
| 114 | lr = selabel_lookup_common(rec, 1, key, type); |
| 115 | if (!lr) |
| 116 | return -1; |
| 117 | |
| 118 | *con = strdup(lr->ctx_raw); |
| 119 | return *con ? 0 : -1; |
| 120 | } |
| 121 | |
| 122 | void selabel_close(struct selabel_handle *rec) |
| 123 | { |
| 124 | rec->func_close(rec); |
| 125 | free(rec); |
| 126 | } |
| 127 | |
| 128 | void selabel_stats(struct selabel_handle *rec) |
| 129 | { |
| 130 | rec->func_stats(rec); |
| 131 | } |