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Diffstat (limited to 'security/nss/lib/util/secport.h')
| -rw-r--r-- | security/nss/lib/util/secport.h | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/security/nss/lib/util/secport.h b/security/nss/lib/util/secport.h new file mode 100644 index 0000000000..fa587b28a4 --- /dev/null +++ b/security/nss/lib/util/secport.h @@ -0,0 +1,368 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * secport.h - portability interfaces for security libraries + */ + +#ifndef _SECPORT_H_ +#define _SECPORT_H_ + +#include "utilrename.h" +#include "prlink.h" + +/* + * define XP_WIN, or XP_UNIX, in case they are not defined + * by anyone else + */ +#ifdef _WINDOWS +#ifndef XP_WIN +#define XP_WIN +#endif +#if defined(_WIN32) || defined(WIN32) +#ifndef XP_WIN32 +#define XP_WIN32 +#endif +#endif +#endif + +#ifdef unix +#ifndef XP_UNIX +#define XP_UNIX +#endif +#endif + +#include <sys/types.h> + +#include <ctype.h> +#include <string.h> +#include <stddef.h> +#include <stdlib.h> +#include <stdint.h> +#include "prtypes.h" +#include "prlog.h" /* for PR_ASSERT */ +#include "plarena.h" +#include "plstr.h" + +/* + * HACK for NSS 2.8 to allow Admin to compile without source changes. + */ +#ifndef SEC_BEGIN_PROTOS +#include "seccomon.h" +#endif + +/* + * The PORT_*Arena* function signatures mostly involve PLArenaPool* arguments. + * But this is misleading! It's not actually safe to use vanilla PLArenaPools + * with them. There are two "subclasses" of PLArenaPool that should be used + * instead. + * + * - PORTArenaPool (defined in secport.c): this "subclass" is always + * heap-allocated and uses a (heap-allocated) lock to protect all accesses. + * Use PORT_NewArena() and PORT_FreeArena() to create and destroy + * PORTArenaPools. + * + * - PORTCheapArenaPool (defined here): this "subclass" can be stack-allocated + * and does not use a lock to protect accesses. This makes it cheaper but + * less general. It is best used for arena pools that (a) are hot, (b) have + * lifetimes bounded within a single function, and (c) don't need locking. + * Use PORT_InitCheapArena() and PORT_DestroyCheapArena() to initialize and + * finalize PORTCheapArenaPools. + * + * All the other PORT_Arena* functions will operate safely with either + * subclass. + */ +typedef struct PORTCheapArenaPool_str { + PLArenaPool arena; + PRUint32 magic; /* This is used to distinguish the two subclasses. */ +} PORTCheapArenaPool; + +SEC_BEGIN_PROTOS + +extern void *PORT_Alloc(size_t len); +extern void *PORT_Realloc(void *old, size_t len); +extern void *PORT_ZAlloc(size_t len); +extern void *PORT_ZAllocAligned(size_t bytes, size_t alignment, void **mem); +extern void *PORT_ZAllocAlignedOffset(size_t bytes, size_t alignment, + size_t offset); +extern void PORT_Free(void *ptr); +extern void PORT_ZFree(void *ptr, size_t len); +extern char *PORT_Strdup(const char *s); +extern void PORT_SetError(int value); +extern int PORT_GetError(void); + +/* These functions are for use with PORTArenaPools. */ +extern PLArenaPool *PORT_NewArena(unsigned long chunksize); +extern void PORT_FreeArena(PLArenaPool *arena, PRBool zero); + +/* These functions are for use with PORTCheapArenaPools. */ +extern void PORT_InitCheapArena(PORTCheapArenaPool *arena, + unsigned long chunksize); +extern void PORT_DestroyCheapArena(PORTCheapArenaPool *arena); + +/* These functions work with both kinds of arena pool. */ +extern void *PORT_ArenaAlloc(PLArenaPool *arena, size_t size); +extern void *PORT_ArenaZAlloc(PLArenaPool *arena, size_t size); +extern void *PORT_ArenaGrow(PLArenaPool *arena, void *ptr, + size_t oldsize, size_t newsize); +extern void *PORT_ArenaMark(PLArenaPool *arena); +extern void PORT_ArenaRelease(PLArenaPool *arena, void *mark); +extern void PORT_ArenaZRelease(PLArenaPool *arena, void *mark); +extern void PORT_ArenaUnmark(PLArenaPool *arena, void *mark); +extern char *PORT_ArenaStrdup(PLArenaPool *arena, const char *str); + +SEC_END_PROTOS + +#define PORT_Assert PR_ASSERT +/* This is a variation of PORT_Assert where the arguments will be always + * used either in Debug or not. But, in optimized mode the result will be + * ignored. See more details in Bug 1588015. */ +#define PORT_AssertArg PR_ASSERT_ARG + +/* Assert the current location can't be reached, passing a reason-string. */ +#define PORT_AssertNotReached(reasonStr) PR_NOT_REACHED(reasonStr) + +/* macros to handle endian based byte conversion */ +#define PORT_GET_BYTE_BE(value, offset, len) \ + ((unsigned char)(((len) - (offset)-1) >= sizeof(value) ? 0 : (((value) >> (((len) - (offset)-1) * PR_BITS_PER_BYTE)) & 0xff))) +#define PORT_GET_BYTE_LE(value, offset, len) \ + ((unsigned char)((offset) > sizeof(value) ? 0 : (((value) >> ((offset)*PR_BITS_PER_BYTE)) & 0xff))) + +/* This runs a function that should return SECSuccess. + * Intended for NSS internal use only. + * The return value is asserted in a debug build, otherwise it is ignored. + * This is no substitute for proper error handling. It is OK only if you + * have ensured that the function cannot fail by other means such as checking + * prerequisites. In that case this can be used as a safeguard against + * unexpected changes in a function. + */ +#ifdef DEBUG +#define PORT_CheckSuccess(f) PR_ASSERT((f) == SECSuccess) +#else +#define PORT_CheckSuccess(f) (f) +#endif +#define PORT_ZNew(type) (type *)PORT_ZAlloc(sizeof(type)) +#define PORT_ZNewAligned(type, alignment, mem) \ + (type *)PORT_ZAllocAlignedOffset(sizeof(type), alignment, offsetof(type, mem)) +#define PORT_New(type) (type *)PORT_Alloc(sizeof(type)) +#define PORT_ArenaNew(poolp, type) \ + (type *)PORT_ArenaAlloc(poolp, sizeof(type)) +#define PORT_ArenaZNew(poolp, type) \ + (type *)PORT_ArenaZAlloc(poolp, sizeof(type)) +#define PORT_NewArray(type, num) \ + (type *)PORT_Alloc(sizeof(type) * (num)) +#define PORT_ZNewArray(type, num) \ + (type *)PORT_ZAlloc(sizeof(type) * (num)) +#define PORT_ArenaNewArray(poolp, type, num) \ + (type *)PORT_ArenaAlloc(poolp, sizeof(type) * (num)) +#define PORT_ArenaZNewArray(poolp, type, num) \ + (type *)PORT_ArenaZAlloc(poolp, sizeof(type) * (num)) + +/* Please, keep these defines sorted alphabetically. Thanks! */ + +#define PORT_Atoi(buff) (int)strtol(buff, NULL, 10) + +/* Returns a UTF-8 encoded constant error string for err. + * Returns NULL if initialization of the error tables fails + * due to insufficient memory. + * + * This string must not be modified by the application. + */ +#define PORT_ErrorToString(err) PR_ErrorToString((err), PR_LANGUAGE_I_DEFAULT) + +#define PORT_ErrorToName PR_ErrorToName + +#define PORT_Memcmp memcmp +#define PORT_Memcpy memcpy +#ifndef SUNOS4 +#define PORT_Memmove memmove +#else /*SUNOS4*/ +#define PORT_Memmove(s, ct, n) bcopy((ct), (s), (n)) +#endif /*SUNOS4*/ +#define PORT_Memset memset + +#define PORT_Strcasecmp PL_strcasecmp +#define PORT_Strcat strcat +#define PORT_Strchr strchr +#define PORT_Strrchr strrchr +#define PORT_Strcmp strcmp +#define PORT_Strcpy strcpy +#define PORT_Strlen(s) strlen(s) +#define PORT_Strncasecmp PL_strncasecmp +#define PORT_Strncat strncat +#define PORT_Strncmp strncmp +#define PORT_Strncpy strncpy +#define PORT_Strpbrk strpbrk +#define PORT_Strstr strstr +#define PORT_Strtok strtok + +#define PORT_Tolower tolower + +typedef PRBool(PR_CALLBACK *PORTCharConversionWSwapFunc)(PRBool toUnicode, + unsigned char *inBuf, unsigned int inBufLen, + unsigned char *outBuf, unsigned int maxOutBufLen, + unsigned int *outBufLen, PRBool swapBytes); + +typedef PRBool(PR_CALLBACK *PORTCharConversionFunc)(PRBool toUnicode, + unsigned char *inBuf, unsigned int inBufLen, + unsigned char *outBuf, unsigned int maxOutBufLen, + unsigned int *outBufLen); + +SEC_BEGIN_PROTOS + +void PORT_SetUCS4_UTF8ConversionFunction(PORTCharConversionFunc convFunc); +void PORT_SetUCS2_ASCIIConversionFunction(PORTCharConversionWSwapFunc convFunc); +PRBool PORT_UCS4_UTF8Conversion(PRBool toUnicode, unsigned char *inBuf, + unsigned int inBufLen, unsigned char *outBuf, + unsigned int maxOutBufLen, unsigned int *outBufLen); +PRBool PORT_UCS2_ASCIIConversion(PRBool toUnicode, unsigned char *inBuf, + unsigned int inBufLen, unsigned char *outBuf, + unsigned int maxOutBufLen, unsigned int *outBufLen, + PRBool swapBytes); +void PORT_SetUCS2_UTF8ConversionFunction(PORTCharConversionFunc convFunc); +PRBool PORT_UCS2_UTF8Conversion(PRBool toUnicode, unsigned char *inBuf, + unsigned int inBufLen, unsigned char *outBuf, + unsigned int maxOutBufLen, unsigned int *outBufLen); + +/* One-way conversion from ISO-8859-1 to UTF-8 */ +PRBool PORT_ISO88591_UTF8Conversion(const unsigned char *inBuf, + unsigned int inBufLen, unsigned char *outBuf, + unsigned int maxOutBufLen, unsigned int *outBufLen); + +extern PRBool +sec_port_ucs4_utf8_conversion_function( + PRBool toUnicode, + unsigned char *inBuf, + unsigned int inBufLen, + unsigned char *outBuf, + unsigned int maxOutBufLen, + unsigned int *outBufLen); + +extern PRBool +sec_port_ucs2_utf8_conversion_function( + PRBool toUnicode, + unsigned char *inBuf, + unsigned int inBufLen, + unsigned char *outBuf, + unsigned int maxOutBufLen, + unsigned int *outBufLen); + +/* One-way conversion from ISO-8859-1 to UTF-8 */ +extern PRBool +sec_port_iso88591_utf8_conversion_function( + const unsigned char *inBuf, + unsigned int inBufLen, + unsigned char *outBuf, + unsigned int maxOutBufLen, + unsigned int *outBufLen); + +extern int NSS_PutEnv(const char *envVarName, const char *envValue); + +extern int NSS_SecureMemcmp(const void *a, const void *b, size_t n); +extern unsigned int NSS_SecureMemcmpZero(const void *mem, size_t n); +extern void NSS_SecureSelect(void *dest, const void *src0, const void *src1, size_t n, unsigned char b); + +/* + * Load a shared library called "newShLibName" in the same directory as + * a shared library that is already loaded, called existingShLibName. + * A pointer to a static function in that shared library, + * staticShLibFunc, is required. + * + * existingShLibName: + * The file name of the shared library that shall be used as the + * "reference library". The loader will attempt to load the requested + * library from the same directory as the reference library. + * + * staticShLibFunc: + * Pointer to a static function in the "reference library". + * + * newShLibName: + * The simple file name of the new shared library to be loaded. + * + * We use PR_GetLibraryFilePathname to get the pathname of the loaded + * shared lib that contains this function, and then do a + * PR_LoadLibraryWithFlags with an absolute pathname for the shared + * library to be loaded. + * + * On Windows, the "alternate search path" strategy is employed, if available. + * On Unix, if existingShLibName is a symbolic link, and no link exists for the + * new library, the original link will be resolved, and the new library loaded + * from the resolved location. + * + * If the new shared library is not found in the same location as the reference + * library, it will then be loaded from the normal system library path. + */ +PRLibrary * +PORT_LoadLibraryFromOrigin(const char *existingShLibName, + PRFuncPtr staticShLibFunc, + const char *newShLibName); + +SEC_END_PROTOS + +/* + * Constant time macros + */ +/* These macros use the fact that arithmetic shift shifts-in the sign bit. + * However, this is not ensured by the C standard so you may need to replace + * them with something else for odd compilers. These macros work for object + * sizes up to 32 bits. The inequalities will produce incorrect results if + * abs(a-b) >= PR_UINT32_MAX/2. This can be a voided if unsigned values stay + * within the range 0-PRUINT32_MAX/2 and signed values stay within the range + * -PRINT32_MAX/2-PRINT32_MAX/2. If these are insufficient, we can fix + * this by either expanding the PORT_CT_DUPLICATE_MSB_TO_ALL to PRUint64 + * or by creating the following new macros for inequality: + * + * PORT_CT_OVERFLOW prevents the overflow condition by handling the case + * where the high bits in a and b are different specially. Basically if + * the high bit in a and b differs we can just + * copy the high bit of one of the parameters to determine the result as + * follows: + * GxU if a has the high bit on, a>b, so d=a + * LxU if b has the high bit on, a<b, so d=b + * GxS if b has the high bit on, it's negative a>b so d=b + * LxS if a has the high bit on, it's negative a<b so d=a + * where PORT_CT_xxU() macros do unsigned compares and PORT_CT_xxS() do signed + * compares. + * + * #define PORT_CT_OVERFLOW(a,b,c,d) \ + * PORT_CT_SEL(PORT_CT_DUPLICATE_MSB_TO_ALL((a)^(b)), \ + * (PORT_CT_DUPLICATE_MSB_TO_ALL(d)),c) + * #define PORT_CT_GTU(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_GT(a,b),a) + * #define PORT_CT_LTU(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_LT(a,b),b) + * #define PORT_CT_GEU(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_GE(a,b),a) + * #define PORT_CT_LEU(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_LE(a,b),b) + * #define PORT_CT_GTS(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_GT(a,b),b) + * #define PORT_CT_LTS(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_LT(a,b),a) + * #define PORT_CT_GES(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_GE(a,b),b) + * #define PORT_CT_LES(a,b) PORT_CT_OVERFLOW(a,b,PORT_CT_LE(a,b),a) + * + * + * */ +/* Constant-time helper macro that copies the MSB of x to all other bits. */ +#define PORT_CT_DUPLICATE_MSB_TO_ALL(x) ((PRUint32)((PRInt32)(x) >> (sizeof(PRInt32) * 8 - 1))) + +/* Constant-time helper macro that selects l or r depending on all-1 or all-0 + * mask m */ +#define PORT_CT_SEL(m, l, r) (((m) & (l)) | (~(m) & (r))) + +/* Constant-time helper macro that returns all-1s if x is not 0; and all-0s + * otherwise. */ +#define PORT_CT_NOT_ZERO(x) (PORT_CT_DUPLICATE_MSB_TO_ALL(((x) | (0 - (x))))) + +/* Constant-time helper macro that returns all-1s if x is 0; and all-0s + * otherwise. */ +#define PORT_CT_ZERO(x) (~PORT_CT_DUPLICATE_MSB_TO_ALL(((x) | (0 - (x))))) + +/* Constant-time helper macro for equalities and inequalities. + * returns all-1's for true and all-0's for false */ +#define PORT_CT_EQ(a, b) PORT_CT_ZERO(((a) - (b))) +#define PORT_CT_NE(a, b) PORT_CT_NOT_ZERO(((a) - (b))) +#define PORT_CT_GT(a, b) PORT_CT_DUPLICATE_MSB_TO_ALL((b) - (a)) +#define PORT_CT_LT(a, b) PORT_CT_DUPLICATE_MSB_TO_ALL((a) - (b)) +#define PORT_CT_GE(a, b) (~PORT_CT_LT(a, b)) +#define PORT_CT_LE(a, b) (~PORT_CT_GT(a, b)) +#define PORT_CT_TRUE (~0) +#define PORT_CT_FALSE 0 + +#endif /* _SECPORT_H_ */ |