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SUSE:SLE-12-SP4:GA
libcares2.30306
CVE-2023-31147.patch
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File CVE-2023-31147.patch of Package libcares2.30306
ported from commit 823df3b989e59465d17b0a2eb1239a5fc048b4e5 Author: Brad House <brad@brad-house.com> Date: Mon May 22 06:51:06 2023 -0400 Merge pull request from GHSA-8r8p-23f3-64c2 * segment random number generation into own file * abstract random code to make it more modular so we can have multiple backends * rand: add support for arc4random_buf() and also direct CARES_RANDOM_FILE reading * autotools: fix detection of arc4random_buf * rework initial rc4 seed for PRNG as last fallback * rc4: more proper implementation, simplified for clarity * clarifications Index: c-ares-1.9.1/configure.ac =================================================================== --- c-ares-1.9.1.orig/configure.ac +++ c-ares-1.9.1/configure.ac @@ -550,6 +550,7 @@ CARES_CHECK_FUNC_STRNCASECMP CARES_CHECK_FUNC_STRNCMPI CARES_CHECK_FUNC_STRNICMP CARES_CHECK_FUNC_WRITEV +CARES_CHECK_FUNC_ARC4RANDOM_BUF dnl check for AF_INET6 Index: c-ares-1.9.1/m4/cares-functions.m4 =================================================================== --- c-ares-1.9.1.orig/m4/cares-functions.m4 +++ c-ares-1.9.1/m4/cares-functions.m4 @@ -3543,3 +3543,88 @@ AC_DEFUN([CARES_CHECK_FUNC_WRITEV], [ ac_cv_func_writev="no" fi ]) + +dnl CARES_CHECK_FUNC_ARC4RANDOM_BUF +dnl ------------------------------------------------- +dnl Verify if arc4random_buf is available, prototyped, and +dnl can be compiled. If all of these are true, and +dnl usage has not been previously disallowed with +dnl shell variable cares_disallow_arc4random_buf, then +dnl HAVE_ARC4RANDOM_BUF will be defined. + +AC_DEFUN([CARES_CHECK_FUNC_ARC4RANDOM_BUF], [ + AC_REQUIRE([CARES_INCLUDES_STDLIB])dnl + # + tst_links_arc4random_buf="unknown" + tst_proto_arc4random_buf="unknown" + tst_compi_arc4random_buf="unknown" + tst_allow_arc4random_buf="unknown" + # + AC_MSG_CHECKING([if arc4random_buf can be linked]) + AC_LINK_IFELSE([ + AC_LANG_FUNC_LINK_TRY([arc4random_buf]) + ],[ + AC_MSG_RESULT([yes]) + tst_links_arc4random_buf="yes" + ],[ + AC_MSG_RESULT([no]) + tst_links_arc4random_buf="no" + ]) + # + if test "$tst_links_arc4random_buf" = "yes"; then + AC_MSG_CHECKING([if arc4random_buf is prototyped]) + AC_EGREP_CPP([arc4random_buf],[ + $cares_includes_stdlib + ],[ + AC_MSG_RESULT([yes]) + tst_proto_arc4random_buf="yes" + ],[ + AC_MSG_RESULT([no]) + tst_proto_arc4random_buf="no" + ]) + fi + # + if test "$tst_proto_arc4random_buf" = "yes"; then + AC_MSG_CHECKING([if arc4random_buf is compilable]) + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ + $cares_includes_stdlib + ]],[[ + arc4random_buf(NULL, 0); + return 1; + ]]) + ],[ + AC_MSG_RESULT([yes]) + tst_compi_arc4random_buf="yes" + ],[ + AC_MSG_RESULT([no]) + tst_compi_arc4random_buf="no" + ]) + fi + # + if test "$tst_compi_arc4random_buf" = "yes"; then + AC_MSG_CHECKING([if arc4random_buf usage allowed]) + if test "x$cares_disallow_arc4random_buf" != "xyes"; then + AC_MSG_RESULT([yes]) + tst_allow_arc4random_buf="yes" + else + AC_MSG_RESULT([no]) + tst_allow_arc4random_buf="no" + fi + fi + # + AC_MSG_CHECKING([if arc4random_buf might be used]) + if test "$tst_links_arc4random_buf" = "yes" && + test "$tst_proto_arc4random_buf" = "yes" && + test "$tst_compi_arc4random_buf" = "yes" && + test "$tst_allow_arc4random_buf" = "yes"; then + AC_MSG_RESULT([yes]) + AC_DEFINE_UNQUOTED(HAVE_ARC4RANDOM_BUF, 1, + [Define to 1 if you have the arc4random_buf function.]) + ac_cv_func_arc4random_buf="yes" + else + AC_MSG_RESULT([no]) + ac_cv_func_arc4random_buf="no" + fi +]) + Index: c-ares-1.9.1/Makefile.inc =================================================================== --- c-ares-1.9.1.orig/Makefile.inc +++ c-ares-1.9.1/Makefile.inc @@ -34,6 +34,7 @@ CSOURCES = ares__close_sockets.c \ ares_platform.c \ ares_process.c \ ares_query.c \ + ares_rand.c \ ares_search.c \ ares_send.c \ ares_strcasecmp.c \ Index: c-ares-1.9.1/ares_config.h.in =================================================================== --- c-ares-1.9.1.orig/ares_config.h.in +++ c-ares-1.9.1/ares_config.h.in @@ -329,6 +329,9 @@ /* Define to 1 if you need the memory.h header file even with stdlib.h */ #undef NEED_MEMORY_H +/* Define to 1 if have arc4random_buf() */ +#undef HAVE_ARC4RANDOM_BUF + /* Define to 1 if _REENTRANT preprocessor symbol must be defined. */ #undef NEED_REENTRANT Index: c-ares-1.9.1/ares_rand.c =================================================================== --- /dev/null +++ c-ares-1.9.1/ares_rand.c @@ -0,0 +1,274 @@ +/* Copyright 1998 by the Massachusetts Institute of Technology. + * Copyright (C) 2007-2013 by Daniel Stenberg + * + * Permission to use, copy, modify, and distribute this + * software and its documentation for any purpose and without + * fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting + * documentation, and that the name of M.I.T. not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" + * without express or implied warranty. + */ + +#include "ares_setup.h" +#include "ares.h" +#include "ares_private.h" +#include "ares_nowarn.h" +#include <stdlib.h> + +typedef enum { + ARES_RAND_OS = 1, /* OS-provided such as RtlGenRandom or arc4random */ + ARES_RAND_FILE = 2, /* OS file-backed random number generator */ + ARES_RAND_RC4 = 3 /* Internal RC4 based PRNG */ +} ares_rand_backend; + +typedef struct ares_rand_rc4 +{ + unsigned char S[256]; + size_t i; + size_t j; +} ares_rand_rc4; + +struct ares_rand_state +{ + ares_rand_backend type; + union { + FILE *rand_file; + ares_rand_rc4 rc4; + } state; +}; + + +/* Define RtlGenRandom = SystemFunction036. This is in advapi32.dll. There is + * no need to dynamically load this, other software used widely does not. + * http://blogs.msdn.com/michael_howard/archive/2005/01/14/353379.aspx + * https://docs.microsoft.com/en-us/windows/win32/api/ntsecapi/nf-ntsecapi-rtlgenrandom + */ +#ifdef _WIN32 +BOOLEAN WINAPI SystemFunction036(PVOID RandomBuffer, ULONG RandomBufferLength); +# ifndef RtlGenRandom +# define RtlGenRandom(a,b) SystemFunction036(a,b) +# endif +#endif + + +#define ARES_RC4_KEY_LEN 32 /* 256 bits */ + +static unsigned int ares_u32_from_ptr(void *addr) +{ + if (sizeof(void *) == 8) { + return (unsigned int)((((size_t)addr >> 32) & 0xFFFFFFFF) | ((size_t)addr & 0xFFFFFFFF)); + } + return (unsigned int)((size_t)addr & 0xFFFFFFFF); +} + + +/* initialize an rc4 key as the last possible fallback. */ +static void ares_rc4_generate_key(ares_rand_rc4 *rc4_state, unsigned char *key, size_t key_len) +{ + size_t i; + size_t len = 0; + unsigned int data; + struct timeval tv; + + if (key_len != ARES_RC4_KEY_LEN) + return; + + /* Randomness is hard to come by. Maybe the system randomizes heap and stack addresses. + * Maybe the current timestamp give us some randomness. + * Use rc4_state (heap), &i (stack), and ares__tvnow() + */ + data = ares_u32_from_ptr(rc4_state); + memcpy(key + len, &data, sizeof(data)); + len += sizeof(data); + + data = ares_u32_from_ptr(&i); + memcpy(key + len, &data, sizeof(data)); + len += sizeof(data); + + tv = ares__tvnow(); + data = (unsigned int)((tv.tv_sec | tv.tv_usec) & 0xFFFFFFFF); + memcpy(key + len, &data, sizeof(data)); + len += sizeof(data); + + srand(ares_u32_from_ptr(rc4_state) | ares_u32_from_ptr(&i) | (unsigned int)((tv.tv_sec | tv.tv_usec) & 0xFFFFFFFF)); + + for (i=len; i<key_len; i++) { + key[i]=(unsigned char)(rand() % 256); /* LCOV_EXCL_LINE */ + } +} + + +static void ares_rc4_init(ares_rand_rc4 *rc4_state) +{ + unsigned char key[ARES_RC4_KEY_LEN]; + size_t i; + size_t j; + + ares_rc4_generate_key(rc4_state, key, sizeof(key)); + + for (i = 0; i < sizeof(rc4_state->S); i++) { + rc4_state->S[i] = i & 0xFF; + } + + for(i = 0, j = 0; i < 256; i++) { + j = (j + rc4_state->S[i] + key[i % sizeof(key)]) % 256; + ARES_SWAP_BYTE(&rc4_state->S[i], &rc4_state->S[j]); + } + + rc4_state->i = 0; + rc4_state->j = 0; +} + +/* Just outputs the key schedule, no need to XOR with any data since we have none */ +static void ares_rc4_prng(ares_rand_rc4 *rc4_state, unsigned char *buf, int len) +{ + unsigned char *S = rc4_state->S; + size_t i = rc4_state->i; + size_t j = rc4_state->j; + size_t cnt; + + for (cnt=0; cnt<len; cnt++) { + i = (i + 1) % 256; + j = (j + S[i]) % 256; + + ARES_SWAP_BYTE(&S[i], &S[j]); + buf[cnt] = S[(S[i] + S[j]) % 256]; + } + + rc4_state->i = i; + rc4_state->j = j; +} + + +static int ares__init_rand_engine(ares_rand_state *state) +{ + memset(state, 0, sizeof(*state)); + +#if defined(HAVE_ARC4RANDOM_BUF) || defined(_WIN32) + state->type = ARES_RAND_OS; + return 1; +#elif defined(CARES_RANDOM_FILE) + state->type = ARES_RAND_FILE; + state->state.rand_file = fopen(CARES_RANDOM_FILE, "rb"); + if (state->state.rand_file) { + setvbuf(state->state.rand_file, NULL, _IONBF, 0); + return 1; + } + /* Fall-Thru on failure to RC4 */ +#endif + + state->type = ARES_RAND_RC4; + ares_rc4_init(&state->state.rc4); + + /* Currently cannot fail */ + return 1; +} + + +ares_rand_state *ares__init_rand_state() +{ + ares_rand_state *state = NULL; + + state = malloc(sizeof(*state)); + if (!state) + return NULL; + + if (!ares__init_rand_engine(state)) { + free(state); + return NULL; + } + + return state; +} + + +static void ares__clear_rand_state(ares_rand_state *state) +{ + if (!state) + return; + + switch (state->type) { + case ARES_RAND_OS: + break; + case ARES_RAND_FILE: + fclose(state->state.rand_file); + break; + case ARES_RAND_RC4: + break; + } +} + + +static void ares__reinit_rand(ares_rand_state *state) +{ + ares__clear_rand_state(state); + ares__init_rand_engine(state); +} + + +void ares__destroy_rand_state(ares_rand_state *state) +{ + if (!state) + return; + + ares__clear_rand_state(state); + free(state); +} + + +static void ares__rand_bytes(ares_rand_state *state, unsigned char *buf, size_t len) +{ + + while (1) { + size_t rv; + size_t bytes_read = 0; + + switch (state->type) { + case ARES_RAND_OS: +#ifdef _WIN32 + RtlGenRandom(buf, len); + return; +#elif defined(HAVE_ARC4RANDOM_BUF) + arc4random_buf(buf, len); + return; +#else + /* Shouldn't be possible to be here */ + break; +#endif + + case ARES_RAND_FILE: + while (1) { + size_t rv = fread(buf + bytes_read, 1, len - bytes_read, state->state.rand_file); + if (rv == 0) + break; /* critical error, will reinit rand state */ + + bytes_read += rv; + if (bytes_read == len) + return; + } + break; + + case ARES_RAND_RC4: + ares_rc4_prng(&state->state.rc4, buf, len); + return; + } + + /* If we didn't return before we got here, that means we had a critical rand + * failure and need to reinitialized */ + ares__reinit_rand(state); + } +} + +unsigned short ares__generate_new_id(ares_rand_state *state) +{ + unsigned short r=0; + + ares__rand_bytes(state, (unsigned char *)&r, sizeof(r)); + return r; +} + Index: c-ares-1.9.1/ares_destroy.c =================================================================== --- c-ares-1.9.1.orig/ares_destroy.c +++ c-ares-1.9.1/ares_destroy.c @@ -84,6 +84,9 @@ void ares_destroy(ares_channel channel) if (channel->lookups) free(channel->lookups); + if (channel->rand_state) + ares__destroy_rand_state(channel->rand_state); + free(channel); } Index: c-ares-1.9.1/ares_init.c =================================================================== --- c-ares-1.9.1.orig/ares_init.c +++ c-ares-1.9.1/ares_init.c @@ -93,7 +93,6 @@ static int config_nameserver(struct serv static int set_search(ares_channel channel, const char *str); static int set_options(ares_channel channel, const char *str); static const char *try_option(const char *p, const char *q, const char *opt); -static int init_id_key(rc4_key* key,int key_data_len); #if !defined(WIN32) && !defined(WATT32) && \ !defined(ANDROID) && !defined(__ANDROID__) @@ -177,6 +176,7 @@ int ares_init_options(ares_channel *chan channel->sock_state_cb_data = NULL; channel->sock_create_cb = NULL; channel->sock_create_cb_data = NULL; + channel->rand_state = NULL; channel->last_server = 0; channel->last_timeout_processed = (time_t)now.tv_sec; @@ -231,9 +231,13 @@ int ares_init_options(ares_channel *chan /* Generate random key */ if (status == ARES_SUCCESS) { - status = init_id_key(&channel->id_key, ARES_ID_KEY_LEN); + channel->rand_state = ares__init_rand_state(); + if (channel->rand_state == NULL) { + status = ARES_ENOMEM; + } + if (status == ARES_SUCCESS) - channel->next_id = ares__generate_new_id(&channel->id_key); + channel->next_id = ares__generate_new_id(channel->rand_state); else DEBUGF(fprintf(stderr, "Error: init_id_key failed: %s\n", ares_strerror(status))); @@ -254,6 +258,8 @@ int ares_init_options(ares_channel *chan free(channel->sortlist); if(channel->lookups) free(channel->lookups); + if (channel->rand_state) + ares__destroy_rand_state(channel->rand_state); free(channel); return status; } @@ -1887,81 +1893,6 @@ static void natural_mask(struct apattern } #endif /* !WIN32 & !WATT32 & !ANDROID & !__ANDROID__ */ -/* initialize an rc4 key. If possible a cryptographically secure random key - is generated using a suitable function (for example win32's RtlGenRandom as - described in - http://blogs.msdn.com/michael_howard/archive/2005/01/14/353379.aspx - otherwise the code defaults to cross-platform albeit less secure mechanism - using rand -*/ -static void randomize_key(unsigned char* key,int key_data_len) -{ - int randomized = 0; - int counter=0; -#ifdef WIN32 - BOOLEAN res; - if (ares_fpSystemFunction036) - { - res = (*ares_fpSystemFunction036) (key, key_data_len); - if (res) - randomized = 1; - } -#else /* !WIN32 */ -#ifdef RANDOM_FILE - FILE *f = fopen(RANDOM_FILE, "rbe"); - if(f) { - counter = aresx_uztosi(fread(key, 1, key_data_len, f)); - fclose(f); - } -#endif -#endif /* WIN32 */ - - if (!randomized) { - for (;counter<key_data_len;counter++) - key[counter]=(unsigned char)(rand() % 256); - } -} - -static int init_id_key(rc4_key* key,int key_data_len) -{ - unsigned char index1; - unsigned char index2; - unsigned char* state; - short counter; - unsigned char *key_data_ptr = 0; - - key_data_ptr = calloc(1,key_data_len); - if (!key_data_ptr) - return ARES_ENOMEM; - - state = &key->state[0]; - for(counter = 0; counter < 256; counter++) - /* unnecessary AND but it keeps some compilers happier */ - state[counter] = (unsigned char)(counter & 0xff); - randomize_key(key->state,key_data_len); - key->x = 0; - key->y = 0; - index1 = 0; - index2 = 0; - for(counter = 0; counter < 256; counter++) - { - index2 = (unsigned char)((key_data_ptr[index1] + state[counter] + - index2) % 256); - ARES_SWAP_BYTE(&state[counter], &state[index2]); - - index1 = (unsigned char)((index1 + 1) % key_data_len); - } - free(key_data_ptr); - return ARES_SUCCESS; -} - -unsigned short ares__generate_new_id(rc4_key* key) -{ - unsigned short r=0; - ares__rc4(key, (unsigned char *)&r, sizeof(r)); - return r; -} - void ares_set_local_ip4(ares_channel channel, unsigned int local_ip) { channel->local_ip4 = local_ip; Index: c-ares-1.9.1/ares_private.h =================================================================== --- c-ares-1.9.1.orig/ares_private.h +++ c-ares-1.9.1/ares_private.h @@ -83,8 +83,6 @@ #endif -#define ARES_ID_KEY_LEN 31 - #include "ares_ipv6.h" #include "ares_llist.h" @@ -237,12 +235,8 @@ struct apattern { unsigned short type; }; -typedef struct rc4_key -{ - unsigned char state[256]; - unsigned char x; - unsigned char y; -} rc4_key; +struct ares_rand_state; +typedef struct ares_rand_state ares_rand_state; struct ares_channeldata { /* Configuration data */ @@ -276,8 +270,8 @@ struct ares_channeldata { /* ID to use for next query */ unsigned short next_id; - /* key to use when generating new ids */ - rc4_key id_key; + /* random state to use when generating new ids */ + ares_rand_state *rand_state; /* Generation number to use for the next TCP socket open/close */ int tcp_connection_generation; @@ -317,14 +311,16 @@ long ares__timeoffset(struct timeval *no struct timeval *check); /* returns ARES_SUCCESS if library has been initialized */ int ares_library_initialized(void); -void ares__rc4(rc4_key* key,unsigned char *buffer_ptr, int buffer_len); void ares__send_query(ares_channel channel, struct query *query, struct timeval *now); void ares__close_sockets(ares_channel channel, struct server_state *server); int ares__get_hostent(FILE *fp, int family, struct hostent **host); int ares__read_line(FILE *fp, char **buf, size_t *bufsize); void ares__free_query(struct query *query); -unsigned short ares__generate_new_id(rc4_key* key); + +ares_rand_state *ares__init_rand_state(void); +void ares__destroy_rand_state(ares_rand_state *state); +unsigned short ares__generate_new_id(ares_rand_state *state); struct timeval ares__tvnow(void); int ares__expand_name_for_response(const unsigned char *encoded, const unsigned char *abuf, int alen, Index: c-ares-1.9.1/ares_query.c =================================================================== --- c-ares-1.9.1.orig/ares_query.c +++ c-ares-1.9.1/ares_query.c @@ -43,32 +43,6 @@ struct qquery { static void qcallback(void *arg, int status, int timeouts, unsigned char *abuf, int alen); -void ares__rc4(rc4_key* key, unsigned char *buffer_ptr, int buffer_len) -{ - unsigned char x; - unsigned char y; - unsigned char* state; - unsigned char xorIndex; - short counter; - - x = key->x; - y = key->y; - - state = &key->state[0]; - for(counter = 0; counter < buffer_len; counter ++) - { - x = (unsigned char)((x + 1) % 256); - y = (unsigned char)((state[x] + y) % 256); - ARES_SWAP_BYTE(&state[x], &state[y]); - - xorIndex = (unsigned char)((state[x] + state[y]) % 256); - - buffer_ptr[counter] = (unsigned char)(buffer_ptr[counter]^state[xorIndex]); - } - key->x = x; - key->y = y; -} - static struct query* find_query_by_id(ares_channel channel, unsigned short id) { unsigned short qid; @@ -99,7 +73,7 @@ static unsigned short generate_unique_id unsigned short id; do { - id = ares__generate_new_id(&channel->id_key); + id = ares__generate_new_id(channel->rand_state); } while (find_query_by_id(channel, id)); return (unsigned short)id;
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