X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Ffunctions.h;h=fbddd35199517d98b35854daa91308e5cc85b229;hp=d5df987966220dda2f1e30d6ee98f3dafbe51a4f;hb=1e1ddfac79fbcd052f199500a6493c7f79cb8462;hpb=a55697acf8d60ff8fc67f8fc46f23b8f53a3b823 diff --git a/src/src/functions.h b/src/src/functions.h index d5df98796..fbddd3519 100644 --- a/src/src/functions.h +++ b/src/src/functions.h @@ -3,6 +3,7 @@ *************************************************/ /* Copyright (c) University of Cambridge 1995 - 2018 */ +/* Copyright (c) The Exim Maintainers 2020 */ /* See the file NOTICE for conditions of use and distribution. */ @@ -13,6 +14,7 @@ are in in fact in separate headers. */ #ifndef _FUNCTIONS_H_ #define _FUNCTIONS_H_ +#include #include @@ -118,7 +120,7 @@ extern int auth_get_data(uschar **, const uschar *, int); extern int auth_get_no64_data(uschar **, uschar *); extern int auth_prompt(const uschar *); extern int auth_read_input(const uschar *); -extern void auth_show_supported(FILE *); +extern gstring * auth_show_supported(gstring *); extern uschar *auth_xtextencode(uschar *, int); extern int auth_xtextdecode(uschar *, uschar **); @@ -148,10 +150,17 @@ extern void bits_clear(unsigned int *, size_t, int *); extern void bits_set(unsigned int *, size_t, int *); extern void cancel_cutthrough_connection(BOOL, const uschar *); +extern gstring *cat_file(FILE *, gstring *, uschar *); +extern gstring *cat_file_tls(void *, gstring *, uschar *); extern int check_host(void *, const uschar *, const uschar **, uschar **); extern uschar **child_exec_exim(int, BOOL, int *, BOOL, int, ...); +extern pid_t child_open_exim_function(int *, const uschar *); +extern pid_t child_open_exim2_function(int *, uschar *, uschar *, + const uschar *); +extern pid_t child_open_function(uschar **, uschar **, int, + int *, int *, BOOL, const uschar *); extern pid_t child_open_uid(const uschar **, const uschar **, int, - uid_t *, gid_t *, int *, int *, uschar *, BOOL); + uid_t *, gid_t *, int *, int *, uschar *, BOOL, const uschar *); extern BOOL cleanup_environment(void); extern void cutthrough_data_puts(uschar *, int); extern void cutthrough_data_put_nl(void); @@ -189,6 +198,7 @@ extern void deliver_succeeded(address_item *); extern uschar *deliver_get_sender_address (uschar *id); extern void delivery_re_exec(int); +extern void die_tainted(const uschar *, const uschar *, int); extern BOOL directory_make(const uschar *, const uschar *, int, BOOL); #ifndef DISABLE_DKIM extern uschar *dkim_exim_query_dns_txt(const uschar *); @@ -221,10 +231,10 @@ extern void msg_event_raise(const uschar *, const address_item *); extern int exim_chown_failure(int, const uschar*, uid_t, gid_t); extern const uschar * exim_errstr(int); -extern void exim_exit(int, const uschar *) NORETURN; +extern void exim_exit(int) NORETURN; extern void exim_nullstd(void); extern void exim_setugid(uid_t, gid_t, BOOL, uschar *); -extern void exim_underbar_exit(int); +extern void exim_underbar_exit(int) NORETURN; extern void exim_wait_tick(struct timeval *, int); extern int exp_bool(address_item *addr, uschar *mtype, uschar *mname, unsigned dgb_opt, uschar *oname, BOOL bvalue, @@ -233,6 +243,8 @@ extern BOOL expand_check_condition(uschar *, uschar *, uschar *); extern uschar *expand_file_big_buffer(const uschar *); extern uschar *expand_string(uschar *); /* public, cannot make const */ extern const uschar *expand_cstring(const uschar *); /* ... so use this one */ +extern uschar *expand_getkeyed(const uschar *, const uschar *); + extern uschar *expand_hide_passwords(uschar * ); extern uschar *expand_string_copy(const uschar *); extern int_eximarith_t expand_string_integer(uschar *, BOOL); @@ -286,9 +298,9 @@ extern void ip_keepalive(int, const uschar *, BOOL); extern int ip_recv(client_conn_ctx *, uschar *, int, time_t); extern int ip_socket(int, int); -extern int ip_tcpsocket(const uschar *, uschar **, int); +extern int ip_tcpsocket(const uschar *, uschar **, int, host_item *); extern int ip_unixsocket(const uschar *, uschar **); -extern int ip_streamsocket(const uschar *, uschar **, int); +extern int ip_streamsocket(const uschar *, uschar **, int, host_item *); extern int ipv6_nmtoa(int *, uschar *); @@ -305,7 +317,7 @@ extern void mainlog_close(void); extern int malware(const uschar *, int); extern int malware_in_file(uschar *); extern void malware_init(void); -extern void malware_show_supported(FILE *); +extern gstring * malware_show_supported(gstring *); #endif extern int match_address_list(const uschar *, BOOL, BOOL, const uschar **, unsigned int *, int, int, const uschar **); @@ -362,8 +374,12 @@ extern int vaguely_random_number_fallback(int); extern BOOL queue_action(uschar *, int, uschar **, int, int); extern void queue_check_only(void); +extern unsigned queue_count(void); +extern unsigned queue_count_cached(void); extern void queue_list(int, uschar **, int); -extern void queue_count(void); +#ifdef EXPERIMENTAL_QUEUE_RAMP +extern void queue_notify_daemon(const uschar * hostname); +#endif extern void queue_run(uschar *, uschar *, BOOL); extern int random_number(int); @@ -416,8 +432,8 @@ extern uschar *rfc2047_decode2(uschar *, BOOL, uschar *, int, int *, int *, uschar **); extern int route_address(address_item *, address_item **, address_item **, address_item **, address_item **, int); -extern int route_check_prefix(const uschar *, const uschar *); -extern int route_check_suffix(const uschar *, const uschar *); +extern int route_check_prefix(const uschar *, const uschar *, unsigned *); +extern int route_check_suffix(const uschar *, const uschar *, unsigned *); extern BOOL route_findgroup(uschar *, gid_t *); extern BOOL route_finduser(const uschar *, struct passwd **, uid_t *); extern BOOL route_find_expanded_group(uschar *, uschar *, uschar *, gid_t *, @@ -425,15 +441,15 @@ extern BOOL route_find_expanded_group(uschar *, uschar *, uschar *, gid_t *, extern BOOL route_find_expanded_user(uschar *, uschar *, uschar *, struct passwd **, uid_t *, uschar **); extern void route_init(void); -extern void route_show_supported(FILE *); +extern gstring * route_show_supported(gstring *); extern void route_tidyup(void); -extern uschar *search_find(void *, uschar *, uschar *, int, const uschar *, int, - int, int *); +extern uschar *search_find(void *, const uschar *, uschar *, int, + const uschar *, int, int, int *, const uschar *); extern int search_findtype(const uschar *, int); extern int search_findtype_partial(const uschar *, int *, const uschar **, int *, - int *); -extern void *search_open(uschar *, int, int, uid_t *, gid_t *); + int *, const uschar **); +extern void *search_open(const uschar *, int, int, uid_t *, gid_t *); extern void search_tidyup(void); extern void set_process_info(const char *, ...) PRINTF_FUNCTION(1,2); extern void sha1_end(hctx *, const uschar *, int, uschar *); @@ -510,7 +526,6 @@ extern int string_is_ip_address(const uschar *, int *); #ifdef SUPPORT_I18N extern BOOL string_is_utf8(const uschar *); #endif -extern uschar *string_nextinlist(const uschar **, int *, uschar *, int); extern const uschar *string_printing2(const uschar *, BOOL); extern uschar *string_split_message(uschar *); extern uschar *string_unprinting(uschar *); @@ -538,6 +553,11 @@ extern gstring *string_vformat_trc(gstring *, const uschar *, unsigned, extern uschar *string_open_failed_trc(int, const uschar *, unsigned, const char *, ...) PRINTF_FUNCTION(4,5); +#define string_nextinlist(lp, sp, b, l) \ + string_nextinlist_trc((lp), (sp), (b), (l), US __FUNCTION__, __LINE__) +extern uschar *string_nextinlist_trc(const uschar **listptr, int *separator, uschar *buffer, int buflen, + const uschar * func, int line); + extern int strcmpic(const uschar *, const uschar *); extern int strncmpic(const uschar *, const uschar *, int); extern uschar *strstric(uschar *, uschar *, BOOL); @@ -566,7 +586,7 @@ extern void transport_write_reset(int); extern BOOL transport_write_string(int, const char *, ...); extern BOOL transport_headers_send(transport_ctx *, BOOL (*)(transport_ctx *, uschar *, int)); -extern void transport_show_supported(FILE *); +extern gstring * transport_show_supported(gstring *); extern BOOL transport_write_message(transport_ctx *, int); extern void tree_add_duplicate(uschar *, address_item *); extern void tree_add_nonrecipient(uschar *); @@ -606,6 +626,67 @@ extern BOOL write_chunk(transport_ctx *, uschar *, int); extern ssize_t write_to_fd_buf(int, const uschar *, size_t); +/******************************************************************************/ +/* Predicate: if an address is in a tainted pool. +By extension, a variable pointing to this address is tainted. +*/ + +static inline BOOL +is_tainted(const void * p) +{ +#if defined(COMPILE_UTILITY) || defined(MACRO_PREDEF) || defined(EM_VERSION_C) +return FALSE; + +#else +extern BOOL is_tainted_fn(const void *); +return is_tainted_fn(p); +#endif +} + +/******************************************************************************/ +/* String functions */ +static inline uschar * __Ustrcat(uschar * dst, const uschar * src, const char * func, int line) +{ +#if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF) +if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrcat", CUS func, line); +#endif +return US strcat(CS dst, CCS src); +} +static inline uschar * __Ustrcpy(uschar * dst, const uschar * src, const char * func, int line) +{ +#if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF) +if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrcpy", CUS func, line); +#endif +return US strcpy(CS dst, CCS src); +} +static inline uschar * __Ustrncat(uschar * dst, const uschar * src, size_t n, const char * func, int line) +{ +#if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF) +if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrncat", CUS func, line); +#endif +return US strncat(CS dst, CCS src, n); +} +static inline uschar * __Ustrncpy(uschar * dst, const uschar * src, size_t n, const char * func, int line) +{ +#if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF) +if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrncpy", CUS func, line); +#endif +return US strncpy(CS dst, CCS src, n); +} +/*XXX will likely need unchecked copy also */ + + +/* Advance the string pointer given over any whitespace. +Return the next char as there's enought places using it to be useful. */ + +#define Uskip_whitespace(sp) skip_whitespace(CUSS sp) + +static inline uschar skip_whitespace(const uschar ** sp) +{ while (isspace(**sp)) (*sp)++; return **sp; } + + +/******************************************************************************/ + #if !defined(MACRO_PREDEF) && !defined(COMPILE_UTILITY) /* exim_chown - in some NFSv4 setups *seemes* to be an issue with chown(, ). @@ -638,8 +719,8 @@ exim_chown(const uschar *name, uid_t owner, gid_t group) return chown(CCS name, owner, group) ? exim_chown_failure(-1, name, owner, group) : 0; } - #endif /* !MACRO_PREDEF && !COMPILE_UTILITY */ + /******************************************************************************/ /* String functions */ @@ -649,25 +730,44 @@ return chown(CCS name, owner, group) *************************************************/ /* This function assumes that memcpy() is faster than strcpy(). +The result is explicitly nul-terminated. */ static inline uschar * -string_copy_taint_trc(const uschar *s, BOOL tainted, const char * func, int line) +string_copyn_taint_trc(const uschar * s, unsigned len, + BOOL tainted, const char * func, int line) { -int len = Ustrlen(s) + 1; -uschar *ss = store_get_3(len, tainted, func, line); +uschar * ss = store_get_3(len + 1, tainted, func, line); memcpy(ss, s, len); +ss[len] = '\0'; return ss; } -#define string_copy_taint(s, tainted) \ - string_copy_taint_trc((s), tainted, __FUNCTION__, __LINE__) +static inline uschar * +string_copy_taint_trc(const uschar * s, BOOL tainted, const char * func, int line) +{ return string_copyn_taint_trc(s, Ustrlen(s), tainted, func, line); } static inline uschar * -string_copy(const uschar * s) -{ -return string_copy_taint((s), is_tainted(s)); -} +string_copyn_trc(const uschar * s, unsigned len, const char * func, int line) +{ return string_copyn_taint_trc(s, len, is_tainted(s), func, line); } +static inline uschar * +string_copy_trc(const uschar * s, const char * func, int line) +{ return string_copy_taint_trc(s, is_tainted(s), func, line); } + + +/* String-copy functions explicitly setting the taint status */ + +#define string_copyn_taint(s, len, tainted) \ + string_copyn_taint_trc((s), (len), (tainted), __FUNCTION__, __LINE__) +#define string_copy_taint(s, tainted) \ + string_copy_taint_trc((s), (tainted), __FUNCTION__, __LINE__) + +/* Simple string-copy functions maintaining the taint */ + +#define string_copyn(s, len) \ + string_copyn_taint_trc((s), (len), is_tainted(s), __FUNCTION__, __LINE__) +#define string_copy(s) \ + string_copy_taint_trc((s), is_tainted(s), __FUNCTION__, __LINE__) /************************************************* @@ -691,31 +791,6 @@ return ss; -/************************************************* -* Copy and save string, given length * -*************************************************/ - -/* It is assumed the data contains no zeros. A zero is added -onto the end. - -Arguments: - s string to copy - n number of characters - -Returns: copy of string in new store - -This is an API for local_scan hence not static. -*/ - -static inline uschar * -string_copyn(const uschar *s, int n) -{ -uschar *ss = store_get(n + 1, is_tainted(s)); -Ustrncpy(ss, s, n); -ss[n] = 0; -return ss; -} - /************************************************* * Copy, lowercase, and save string, given length * *************************************************/ @@ -820,6 +895,12 @@ g->s[g->ptr] = '\0'; return g->s; } +static inline unsigned +gstring_length(const gstring * g) +{ +return g ? (unsigned)g->ptr : 0; +} + #define gstring_release_unused(g) \ gstring_release_unused_trc(g, __FUNCTION__, __LINE__) @@ -853,6 +934,18 @@ va_end(ap); return g; } + +/* Copy the content of a string to tainted memory */ + +static inline void +gstring_rebuffer(gstring * g) +{ +uschar * s = store_get(g->size, TRUE); +memcpy(s, g->s, g->ptr); +g->s = s; +} + + /******************************************************************************/ #define store_get_dns_answer() store_get_dns_answer_trc(CUS __FUNCTION__, __LINE__) @@ -930,6 +1023,8 @@ subdir_str[1] = '\0'; } /******************************************************************************/ +/* Time calculations */ + static inline void timesince(struct timeval * diff, const struct timeval * then) { @@ -979,10 +1074,106 @@ static inline void testharness_pause_ms(int millisec) { #ifndef MEASURE_TIMING -if (f.running_in_test_harness) millisleep(millisec); +if (f.running_in_test_harness && f.testsuite_delays) millisleep(millisec); #endif } +/******************************************************************************/ +/* Taint-checked file opens */ + +static inline int +exim_open2(const char *pathname, int flags) +{ +if (!is_tainted(pathname)) return open(pathname, flags); +log_write(0, LOG_MAIN|LOG_PANIC, "Tainted filename '%s'", pathname); +errno = EACCES; +return -1; +} +static inline int +exim_open(const char *pathname, int flags, mode_t mode) +{ +if (!is_tainted(pathname)) return open(pathname, flags, mode); +log_write(0, LOG_MAIN|LOG_PANIC, "Tainted filename '%s'", pathname); +errno = EACCES; +return -1; +} +static inline int +exim_openat(int dirfd, const char *pathname, int flags) +{ +if (!is_tainted(pathname)) return openat(dirfd, pathname, flags); +log_write(0, LOG_MAIN|LOG_PANIC, "Tainted filename '%s'", pathname); +errno = EACCES; +return -1; +} +static inline int +exim_openat4(int dirfd, const char *pathname, int flags, mode_t mode) +{ +if (!is_tainted(pathname)) return openat(dirfd, pathname, flags, mode); +log_write(0, LOG_MAIN|LOG_PANIC, "Tainted filename '%s'", pathname); +errno = EACCES; +return -1; +} + +static inline FILE * +exim_fopen(const char *pathname, const char *mode) +{ +if (!is_tainted(pathname)) return fopen(pathname, mode); +log_write(0, LOG_MAIN|LOG_PANIC, "Tainted filename '%s'", pathname); +errno = EACCES; +return NULL; +} + +static inline DIR * +exim_opendir(const uschar * name) +{ +if (!is_tainted(name)) return opendir(CCS name); +log_write(0, LOG_MAIN|LOG_PANIC, "Tainted dirname '%s'", name); +errno = EACCES; +return NULL; +} + +/******************************************************************************/ +# if !defined(COMPILE_UTILITY) +/* Process manipulation */ + +static inline pid_t +exim_fork(const unsigned char * purpose) +{ +pid_t pid; +DEBUG(D_any) debug_printf("%s forking for %s\n", process_purpose, purpose); +if ((pid = fork()) == 0) + { + process_purpose = purpose; + DEBUG(D_any) debug_printf("postfork: %s\n", purpose); + } +else + { + testharness_pause_ms(100); /* let child work */ + DEBUG(D_any) debug_printf("%s forked for %s: %d\n", process_purpose, purpose, (int)pid); + } +return pid; +} + + +static inline pid_t +child_open_exim(int * fdptr, const uschar * purpose) +{ return child_open_exim_function(fdptr, purpose); } + +static inline pid_t +child_open_exim2(int * fdptr, uschar * sender, + uschar * sender_auth, const uschar * purpose) +{ return child_open_exim2_function(fdptr, sender, sender_auth, purpose); } + +static inline pid_t +child_open(uschar **argv, uschar **envp, int newumask, int *infdptr, + int *outfdptr, BOOL make_leader, const uschar * purpose) +{ return child_open_function(argv, envp, newumask, infdptr, + outfdptr, make_leader, purpose); +} + +# endif /* !COMPILE_UTILITY */ + +/******************************************************************************/ #endif /* !MACRO_PREDEF */ #endif /* _FUNCTIONS_H_ */