| 1 | /* --------------------------------------------------------------
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| 2 | *
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| 3 | * The developement of this library has been stimulated by reading
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| 4 | * a paper on 'Robust Programming' by Matt Bishop, although
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| 5 | * not all of his ideas might be implemented in the same
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| 6 | * strictness as discussed in the paper.
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| 7 | *
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| 8 | * --------------------------------------------------------------
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| 9 | */
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| 10 |
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| 11 | #ifndef SL_SLIB_H
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| 12 | #define SL_SLIB_H
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| 13 |
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| 14 | #include <errno.h>
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| 15 | #include <stdio.h>
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| 16 | #include <stdlib.h>
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| 17 | #include <stdarg.h>
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| 18 | #include <sys/types.h>
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| 19 |
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| 20 | #include "config_xor.h"
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| 21 |
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| 22 | #ifdef HAVE_UNISTD_H
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| 23 | #include <unistd.h>
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| 24 | #endif
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| 25 |
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| 26 | #include "sh_string.h"
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| 27 |
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| 28 | /****************
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| 29 |
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| 30 | -- Defined in config.h. --
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| 31 |
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| 32 | #ifndef _(string)
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| 33 | #define _(string) string
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| 34 | #endif
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| 35 |
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| 36 | #ifndef N_(string)
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| 37 | #define N_(string) string
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| 38 | #endif
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| 39 |
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| 40 | *****************/
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| 41 |
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| 42 | /* --------------------------------------------------------------
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| 43 | *
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| 44 | * Typedefs, global variables, macros.
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| 45 | *
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| 46 | * --------------------------------------------------------------
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| 47 | */
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| 48 |
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| 49 | extern long int sl_errno; /* Global error variable. */
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| 50 |
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| 51 |
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| 52 | /* The ticketing system; used to hide internals from the
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| 53 | * programmer.
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| 54 | */
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| 55 | typedef long int SL_TICKET; /* Unique ID for opened files. */
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| 56 |
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| 57 |
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| 58 | /*
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| 59 | * TRUE, FALSE
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| 60 | */
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| 61 | #define SL_TRUE 1
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| 62 | #define SL_FALSE 0
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| 63 |
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| 64 | #define SH_GRBUF_SIZE 4096
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| 65 | #define SH_PWBUF_SIZE 4096
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| 66 |
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| 67 |
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| 68 | #if defined(__GNUC__) && (__GNUC__ >= 3)
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| 69 | #undef SL_GNUC_CONST
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| 70 | #define SL_GNUC_CONST __attribute__((const))
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| 71 | #else
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| 72 | #undef SL_GNUC_CONST
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| 73 | #define SL_GNUC_CONST
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| 74 | #endif
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| 75 |
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| 76 | /*
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| 77 | * The following macros are provided:
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| 78 | *
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| 79 | * SL_ISERROR(x) TRUE if return status of 'x' is an error code.
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| 80 | * SL_REQUIRE(x, xstr) Abort if 'x' is false.
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| 81 | * SL_ENTER(s) Trace entry in function 's'.
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| 82 | * SL_RETURN(x, s) Trace return from function 's'.
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| 83 | */
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| 84 |
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| 85 |
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| 86 | /*
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| 87 | * The error codes.
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| 88 | */
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| 89 | #define SL_ENONE 0
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| 90 |
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| 91 | #define SL_ENULL -1024 /* Invalid use of NULL pointer. */
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| 92 | #define SL_ERANGE -1025 /* Argument out of range. */
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| 93 | #define SL_ETRUNC -1026 /* Result truncated. */
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| 94 | #define SL_EREPEAT -1027 /* Illegal repeated use of function. */
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| 95 |
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| 96 | #define SL_EINTERNAL -1028 /* Internal error. */
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| 97 | #define SL_ETICKET -1029 /* Bad ticket. */
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| 98 | #define SL_EBADFILE -1030 /* File access error. Check errno. */
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| 99 | #define SL_EBOGUS -1031 /* Bogus file. */
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| 100 | #define SL_EMEM -1032 /* Out of memory. */
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| 101 | #define SL_EUNLINK -1033 /* Unlink error. Check errno. */
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| 102 | #define SL_EREWIND -1034 /* Rewind error. Check errno. */
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| 103 | #define SL_EFORWARD -1035 /* Forward error. Check errno. */
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| 104 | #define SL_EREAD -1036 /* Read error. Check errno. */
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| 105 | #define SL_EWRITE -1037 /* Write error. Check errno. */
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| 106 | #define SL_ESYNC -1038 /* Write error. Check errno. */
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| 107 |
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| 108 | #define SL_EBADNAME -1040 /* Invalid name. */
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| 109 | #define SL_ESTAT -1041 /* stat of file failed. Check errno. */
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| 110 |
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| 111 | #define SL_EBADUID -1050 /* Owner not trustworthy. */
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| 112 | #define SL_EBADGID -1051 /* Group writeable and not trustworthy.*/
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| 113 | #define SL_EBADOTH -1052 /* World writeable. */
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| 114 |
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| 115 | #define SL_TOOMANY -1053 /* Too many open files */
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| 116 | #define SL_TIMEOUT -1054 /* Timeout in read */
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| 117 | /*
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| 118 | * All int functions return SL_NONE on success.
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| 119 | */
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| 120 |
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| 121 | #ifdef __cplusplus
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| 122 | extern "C" {
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| 123 | #endif
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| 124 |
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| 125 | int dlog (int flag, char * file, int line, const char *fmt, ...);
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| 126 |
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| 127 | char * sl_get_errmsg();
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| 128 |
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| 129 | /* ----------------------------------------------------------------
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| 130 | *
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| 131 | * Heap consistency routines
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| 132 | *
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| 133 | * ---------------------------------------------------------------- */
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| 134 |
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| 135 | int sl_test_heap();
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| 136 |
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| 137 | /* ----------------------------------------------------------------
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| 138 | *
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| 139 | * Capability routines
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| 140 | *
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| 141 | * ---------------------------------------------------------------- */
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| 142 |
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| 143 | extern int sl_useCaps;
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| 144 |
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| 145 | int sl_drop_cap ();
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| 146 | int sl_drop_cap_sub();
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| 147 | int sl_get_cap_sub();
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| 148 | int sl_drop_cap_qdel();
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| 149 | int sl_get_cap_qdel();
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| 150 |
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| 151 | /* ----------------------------------------------------------------
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| 152 | *
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| 153 | * String handling routines
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| 154 | *
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| 155 | * ---------------------------------------------------------------- */
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| 156 |
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| 157 | /*
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| 158 | * A memset that does not get optimized away
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| 159 | */
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| 160 | void *sl_memset(void *s, int c, size_t n);
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| 161 | #if !defined(SH_REAL_SET)
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| 162 | #undef memset
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| 163 | #define memset sl_memset
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| 164 | #endif
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| 165 |
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| 166 | /*
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| 167 | * Copy src to dst. siz is the length of dst.
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| 168 | */
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| 169 | int sl_strlcpy(char * dst, /*@null@*/const char * src, size_t siz);
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| 170 |
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| 171 | /*
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| 172 | * Append src to dst. siz is the length of dst.
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| 173 | */
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| 174 | int sl_strlcat(char * dst, /*@null@*/const char *src, size_t siz);
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| 175 |
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| 176 | /*
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| 177 | * An implementation of vsnprintf. va_start/va_end are in the caller
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| 178 | * function.
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| 179 | */
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| 180 | int sl_vsnprintf(char *str, size_t n,
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| 181 | const char *format, va_list vl );
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| 182 |
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| 183 | /*
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| 184 | * An implementation of snprintf.
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| 185 | */
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| 186 | int sl_snprintf(char *str, size_t n,
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| 187 | const char *format, ... );
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| 188 |
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| 189 | /*
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| 190 | * A robust drop-in replacement of strncpy. strlcpy is preferable.
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| 191 | */
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| 192 | char * sl_strncpy(/*@out@*/char *dst, const char *src, size_t size);
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| 193 |
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| 194 | /*
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| 195 | * Robust strncat.
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| 196 | */
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| 197 | char * sl_strncat(char *dst, const char *src, size_t n);
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| 198 |
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| 199 | /*
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| 200 | * strstr
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| 201 | */
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| 202 | char * sl_strstr (const char * haystack, const char * needle);
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| 203 |
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| 204 | /*
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| 205 | * robust strncmp replacement
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| 206 | */
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| 207 | int sl_strncmp(const char * a, const char * b, size_t n);
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| 208 |
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| 209 | /*
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| 210 | * robust strcmp replacement
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| 211 | */
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| 212 | int sl_strcmp(const char * a, const char * b);
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| 213 |
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| 214 | /*
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| 215 | * robust strlen replacement
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| 216 | */
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| 217 | #define sl_strlen(arg) ((arg == NULL) ? 0 : (strlen(arg)))
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| 218 |
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| 219 | /* ----------------------------------------------------------------
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| 220 | *
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| 221 | * Privilege handling routines
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| 222 | *
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| 223 | * ---------------------------------------------------------------- */
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| 224 |
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| 225 | /*
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| 226 | * ONE OF THE FOLLOWING THREE FUNCTIONS
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| 227 | * SHOULD BE CALLED BEFORE ANY OTHER OF THE
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| 228 | * UID HANDLING FUNCTIONS.
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| 229 | */
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| 230 | int sl_policy_get_user(char *username); /* drop SUID to <username> */
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| 231 | int sl_policy_get_real(char *username); /* drop privs to <username> */
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| 232 | int sl_policy_get_root(void); /* drop SUID to root */
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| 233 |
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| 234 | /*
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| 235 | * If not using one of the above, use this function,
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| 236 | * and then call sh_unset_suid().
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| 237 | * This function saves the uid's.
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| 238 | * It calls abort() on error.
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| 239 | */
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| 240 | int sl_save_uids(void);
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| 241 |
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| 242 | /*
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| 243 | * This function returns the saved euid.
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| 244 | * It calls abort() if the uid's are not saved already.
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| 245 | */
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| 246 | int sl_get_euid(/*@out@*/uid_t * ret);
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| 247 | uid_t sl_ret_euid();
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| 248 |
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| 249 | /*
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| 250 | * This function returns the saved egid.
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| 251 | * It calls abort() if the uid's are not saved already.
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| 252 | */
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| 253 | int sl_get_egid(/*@out@*/gid_t * ret);
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| 254 |
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| 255 | /*
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| 256 | * This function returns the saved current ruid.
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| 257 | * It calls abort() if the uid's are not saved already.
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| 258 | */
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| 259 | int sl_get_ruid(/*@out@*/uid_t * ret);
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| 260 |
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| 261 | /*
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| 262 | * This function returns the saved current rgid.
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| 263 | * It calls abort() if the uid's are not saved already.
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| 264 | */
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| 265 | int sl_get_rgid(gid_t * ret);
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| 266 |
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| 267 | /*
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| 268 | * This function returns the saved original ruid.
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| 269 | * It calls abort() if the uid's are not saved already.
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| 270 | */
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| 271 | int sl_get_ruid_orig(uid_t * ret);
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| 272 |
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| 273 | /*
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| 274 | * This function returns the saved original rgid.
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| 275 | * It calls abort() if the uid's are not saved already.
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| 276 | */
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| 277 | int sl_get_rgid_orig(gid_t * ret);
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| 278 |
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| 279 | /*
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| 280 | * This function returns true if the program is SUID.
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| 281 | * It calls abort() if the uid's are not saved already.
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| 282 | */
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| 283 | int sl_is_suid(void);
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| 284 |
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| 285 | /*
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| 286 | * This function sets the effective uid
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| 287 | * to the saved effective uid.
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| 288 | */
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| 289 | int sl_set_suid (void);
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| 290 |
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| 291 | /*
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| 292 | * This function sets the effective uid to the real uid.
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| 293 | */
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| 294 | int sl_unset_suid (void);
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| 295 |
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| 296 | /*
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| 297 | * This function drops SUID privileges irrevocably.
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| 298 | */
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| 299 | int sl_drop_privileges(void);
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| 300 |
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| 301 | /* ----------------------------------------------------------------
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| 302 | *
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| 303 | * File handling routines
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| 304 | *
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| 305 | * ---------------------------------------------------------------- */
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| 306 |
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| 307 | SL_TICKET sl_make_ticket (int fd, const char * path);
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| 308 |
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| 309 | /* Open for writing.
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| 310 | */
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| 311 | SL_TICKET sl_open_write (const char * fname, int priviledge_mode);
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| 312 |
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| 313 | /* Open for reading.
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| 314 | */
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| 315 | SL_TICKET sl_open_read (const char * fname, int priviledge_mode);
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| 316 |
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| 317 | /* Open for reading w/minimum checking.
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| 318 | */
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| 319 | SL_TICKET sl_open_fastread (const char * fname, int priviledge_mode);
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| 320 |
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| 321 | /* Open for read and write.
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| 322 | */
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| 323 | SL_TICKET sl_open_rdwr (const char * fname, int priviledge_mode);
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| 324 |
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| 325 | /* Open for read and write, fail if file exists.
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| 326 | */
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| 327 | SL_TICKET sl_open_safe_rdwr (const char * fname, int priv);
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| 328 |
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| 329 | /* Open for write, truncate.
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| 330 | */
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| 331 | SL_TICKET sl_open_write_trunc (const char * fname, int priviledge_mode);
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| 332 |
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| 333 | /* Open for read and write, truncate.
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| 334 | */
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| 335 | SL_TICKET sl_open_rdwr_trunc (const char * fname, int priviledge_mode);
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| 336 |
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| 337 | /* Initialize the content sh_string.
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| 338 | */
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| 339 | int sl_init_content (SL_TICKET ticket, size_t size);
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| 340 |
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| 341 | /* Get the (pointer to) the content sh_string.
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| 342 | */
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| 343 | sh_string * sl_get_content (SL_TICKET ticket);
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| 344 |
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| 345 | /* Close file.
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| 346 | */
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| 347 | int sl_close (SL_TICKET ticket);
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| 348 |
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| 349 | /* Unlink file.
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| 350 | */
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| 351 | int sl_unlink (SL_TICKET ticket);
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| 352 |
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| 353 | /* Rewind file.
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| 354 | */
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| 355 | int sl_rewind (SL_TICKET ticket);
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| 356 |
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| 357 | /* Seek file.
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| 358 | */
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| 359 | int sl_seek (SL_TICKET ticket, off_t off_data);
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| 360 |
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| 361 | /* Forward file.
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| 362 | */
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| 363 | int sl_forward (SL_TICKET ticket);
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| 364 |
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| 365 | /* Sync file.
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| 366 | */
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| 367 | int sl_sync (SL_TICKET ticket);
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| 368 |
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| 369 | /* Read file.
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| 370 | */
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| 371 | int sl_read (SL_TICKET ticket, void * buf, size_t count);
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| 372 |
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| 373 | int sl_read_timeout_prep (SL_TICKET ticket);
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| 374 |
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| 375 | int sl_read_timeout_fd (int fd, void * buf,
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| 376 | size_t count, int timeout, int is_nonblocking);
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| 377 |
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| 378 | int sl_read_timeout (SL_TICKET ticket, void * buf,
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| 379 | size_t count, int timeout, int is_nonblocking);
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| 380 |
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| 381 | int sl_read_fast (SL_TICKET ticket, void * buf_in, size_t count);
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| 382 |
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| 383 | /* Write file.
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| 384 | */
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| 385 | int sl_write (SL_TICKET ticket, void * msg, long nbytes);
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| 386 |
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| 387 | /* Write file, terminate with newline.
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| 388 | */
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| 389 | int sl_write_line (SL_TICKET ticket, void * msg, long nbytes);
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| 390 |
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| 391 | /* As above, but only for non-constant strings.
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| 392 | */
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| 393 | int sl_write_line_fast (SL_TICKET ticket, void * msg, long nbytes);
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| 394 |
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| 395 | /* Drop all metadata for file descriptors >= fd.
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| 396 | */
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| 397 | int sl_dropall(int fd, int except);
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| 398 |
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| 399 | /* Check whether file is trustworthy.
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| 400 | */
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| 401 | int sl_trustfile(char * path, uid_t * ok, uid_t * bad);
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| 402 |
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| 403 | /* Check whether file is trustworthy.
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| 404 | */
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| 405 | int sl_trustfile_euid(char * filename, uid_t euid);
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| 406 |
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| 407 | /* purge list of trusted users
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| 408 | */
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| 409 | int sl_trust_purge_user ();
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| 410 |
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| 411 | /* Add a trusted user.
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| 412 | */
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| 413 | int sl_trust_add_user (uid_t pwid);
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| 414 |
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| 415 | /* Get error string.
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| 416 | */
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| 417 | char * sl_error_string(int errorcode);
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| 418 |
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| 419 | /* Get error file.
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| 420 | */
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| 421 | char * sl_trust_errfile(void);
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| 422 |
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| 423 | /* Overflow tests
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| 424 | */
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| 425 | int sl_ok_muli (int a, int b) SL_GNUC_CONST;
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| 426 | int sl_ok_divi (int a, int b) SL_GNUC_CONST;
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| 427 | int sl_ok_addi (int a, int b) SL_GNUC_CONST;
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| 428 | int sl_ok_subi (int a, int b) SL_GNUC_CONST;
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| 429 |
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| 430 | int sl_ok_muls (size_t a, size_t b) SL_GNUC_CONST;
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| 431 | int sl_ok_adds (size_t a, size_t b) SL_GNUC_CONST;
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| 432 |
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| 433 |
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| 434 | #ifdef __cplusplus
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| 435 | }
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| 436 | #endif
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| 437 |
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| 438 | /* Privilege modes for file access.
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| 439 | */
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| 440 | #define SL_YESPRIV 0x33
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| 441 | #define SL_NOPRIV 0x34
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| 442 |
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| 443 | /* Suitable for Linux
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| 444 | */
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| 445 | #define MAXFILENAME 4096
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| 446 |
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| 447 |
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| 448 | /*
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| 449 | * This macro is TRUE if (x) < 0.
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| 450 | */
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| 451 | #define SL_ISERROR(x) ((long)(x) < 0)
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| 452 |
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| 453 | #if defined(WITH_TPT)
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| 454 | #define TPT(arg) dlog arg ;
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| 455 | #else
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| 456 | #define TPT(arg)
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| 457 | #endif
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| 458 |
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| 459 |
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| 460 | /*
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| 461 | * The 'require' macro.
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| 462 | */
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| 463 | #define SL_REQUIRE(assertion, astext) \
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| 464 | do { \
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| 465 | /*@i@*/ if (assertion) ; \
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| 466 | else { \
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| 467 | dlog(0, FIL__, __LINE__, SDG_AFAIL, \
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| 468 | FIL__, __LINE__, astext); \
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| 469 | _exit(EXIT_FAILURE); \
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| 470 | } \
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| 471 | } while (0)
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| 472 |
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| 473 |
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| 474 | /*
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| 475 | * The enter macro. Prints the trace if TRACE is on.
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| 476 | */
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| 477 | extern int slib_do_trace;
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| 478 | extern int slib_trace_fd;
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| 479 |
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| 480 | #if defined(SL_DEBUG)
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| 481 | #define SL_ENTER(s) sl_stack_push(s, FIL__, __LINE__);
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| 482 | #else
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| 483 | #define SL_ENTER(s) if (slib_do_trace != 0) sl_trace_in(s, FIL__, __LINE__);
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| 484 | #endif
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| 485 |
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| 486 | /*
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| 487 | * The return macro.
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| 488 | */
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| 489 | #if defined(SL_DEBUG)
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| 490 | #ifndef S_SPLINT_S
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| 491 | #define SL_RETURN(x, s) \
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| 492 | do { \
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| 493 | sl_stack_pop(s, FIL__, __LINE__); \
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| 494 | return(x); \
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| 495 | } while(0)
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| 496 | #else
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| 497 | /*@notfunction@*/
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| 498 | #define SL_RETURN(x, s) return(x);
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| 499 | #endif /* S_SPLINT_S */
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| 500 | #else
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| 501 | #ifndef S_SPLINT_S
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| 502 | #define SL_RETURN(x, s) \
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| 503 | do { \
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| 504 | if (slib_do_trace != 0) \
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| 505 | sl_trace_out(s, FIL__, __LINE__); \
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| 506 | return(x); \
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| 507 | } while(0)
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| 508 | #else
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| 509 | /*@notfunction@*/
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| 510 | #define SL_RETURN(x, s) return(x);
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| 511 | #endif /* S_SPLINT_S */
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| 512 | #endif /* SL_RETURN macro */
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| 513 |
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| 514 | #if defined(SL_DEBUG)
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| 515 | #define SL_RET0(s) \
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| 516 | do { \
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| 517 | sl_stack_pop(s, FIL__, __LINE__); \
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| 518 | return; \
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| 519 | } while(0)
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| 520 | #else
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| 521 | #ifndef S_SPLINT_S
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| 522 | #define SL_RET0(s) \
|
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| 523 | do { \
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| 524 | if (slib_do_trace != 0) \
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| 525 | sl_trace_out(s, FIL__, __LINE__); \
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| 526 | return; \
|
|---|
| 527 | } while(0)
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|---|
| 528 | #else
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|---|
| 529 | /*@notfunction@*/
|
|---|
| 530 | #define SL_RET0(s) return;
|
|---|
| 531 | #endif /* S_SPLINT_S */
|
|---|
| 532 | #endif /* SL_RETURN macro */
|
|---|
| 533 |
|
|---|
| 534 | #if defined(SL_DEBUG)
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|---|
| 535 | void sl_stack_push(char * c, char * file, int line);
|
|---|
| 536 | void sl_stack_pop(char * c, char * file, int line);
|
|---|
| 537 | void sl_stack_print();
|
|---|
| 538 | #endif
|
|---|
| 539 | void sl_trace_in (char * str, char * file, int line);
|
|---|
| 540 | void sl_trace_out (char * str, char * file, int line);
|
|---|
| 541 | int sl_trace_file (const char * str);
|
|---|
| 542 | int sl_trace_use (const char * str);
|
|---|
| 543 |
|
|---|
| 544 |
|
|---|
| 545 |
|
|---|
| 546 |
|
|---|
| 547 | /*
|
|---|
| 548 | * The internal return macro. Sets sl_errno to the return value.
|
|---|
| 549 | */
|
|---|
| 550 |
|
|---|
| 551 | #if defined(SL_DEBUG)
|
|---|
| 552 | #define SL_IRETURN(x, s) \
|
|---|
| 553 | do { \
|
|---|
| 554 | if((long)(x) < 0) { \
|
|---|
| 555 | TPT((0, FIL__, __LINE__, SDG_ERROR, (long)(x))) \
|
|---|
| 556 | sl_errno=(x); \
|
|---|
| 557 | } \
|
|---|
| 558 | sl_stack_pop(s, FIL__, __LINE__); \
|
|---|
| 559 | if (1) return(x); \
|
|---|
| 560 | } while(0)
|
|---|
| 561 | #else
|
|---|
| 562 | #define SL_IRETURN(x, s) \
|
|---|
| 563 | do { \
|
|---|
| 564 | if ((long)(x) < 0) sl_errno=(x); \
|
|---|
| 565 | if (slib_do_trace) \
|
|---|
| 566 | sl_trace_out(s, FIL__, __LINE__); \
|
|---|
| 567 | if (1) return(x); \
|
|---|
| 568 | } while(0)
|
|---|
| 569 |
|
|---|
| 570 | #endif /* SL_IRETURN macro */
|
|---|
| 571 |
|
|---|
| 572 |
|
|---|
| 573 |
|
|---|
| 574 | /* slib.h */
|
|---|
| 575 | #endif
|
|---|
| 576 |
|
|---|
| 577 |
|
|---|
| 578 |
|
|---|
| 579 |
|
|---|
