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https://github.com/freebsd/freebsd-src
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1d9722de6f
Intentionally or not, but the libwrap was written in such manner that if your /etc/hosts.allow doesn't have any domain names, neither smart keywords like LOCAL or KNOWN, then it will not try to resolve the client address during the hosts check. This was achieved with the NOT_INADDR() check that matched IPv4 addresses/prefixes. Extend this to also skip resolve if client list token looks like IPv6. Reviewed by: philip, emaste PR: 269456 Differential revision: https://reviews.freebsd.org/D40070
226 lines
8.2 KiB
C
226 lines
8.2 KiB
C
/*
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* @(#) tcpd.h 1.5 96/03/19 16:22:24
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*
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* $FreeBSD$
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*/
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#ifdef INET6
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#define TCPD_SOCKADDR struct sockaddr
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#else
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#define TCPD_SOCKADDR struct sockaddr_in
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#endif
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#ifndef _STDFILE_DECLARED
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#define _STDFILE_DECLARED
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typedef struct __sFILE FILE;
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#endif
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/* Structure to describe one communications endpoint. */
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#define STRING_LENGTH 128 /* hosts, users, processes */
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struct host_info {
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char name[STRING_LENGTH]; /* access via eval_hostname(host) */
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char addr[STRING_LENGTH]; /* access via eval_hostaddr(host) */
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TCPD_SOCKADDR *sin; /* socket address or 0 */
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struct t_unitdata *unit; /* TLI transport address or 0 */
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struct request_info *request; /* for shared information */
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};
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/* Structure to describe what we know about a service request. */
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struct request_info {
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int fd; /* socket handle */
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char user[STRING_LENGTH]; /* access via eval_user(request) */
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char daemon[STRING_LENGTH]; /* access via eval_daemon(request) */
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char pid[10]; /* access via eval_pid(request) */
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struct host_info client[1]; /* client endpoint info */
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struct host_info server[1]; /* server endpoint info */
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void (*sink) (int); /* datagram sink function or 0 */
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void (*hostname) (struct host_info *); /* address to printable hostname */
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void (*hostaddr) (struct host_info *); /* address to printable address */
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void (*cleanup) (struct request_info *); /* cleanup function or 0 */
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struct netconfig *config; /* netdir handle */
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};
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/* Common string operations. Less clutter should be more readable. */
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#define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; }
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#define STRN_EQ(x,y,l) (strncasecmp((x),(y),(l)) == 0)
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#define STRN_NE(x,y,l) (strncasecmp((x),(y),(l)) != 0)
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#define STR_EQ(x,y) (strcasecmp((x),(y)) == 0)
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#define STR_NE(x,y) (strcasecmp((x),(y)) != 0)
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/*
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* Initially, all above strings have the empty value. Information that
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* cannot be determined at runtime is set to "unknown", so that we can
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* distinguish between `unavailable' and `not yet looked up'. A hostname
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* that we do not believe in is set to "paranoid".
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*/
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#define STRING_UNKNOWN "unknown" /* lookup failed */
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#define STRING_PARANOID "paranoid" /* hostname conflict */
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extern char unknown[];
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extern char paranoid[];
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#define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))
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#define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0)
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#define NOT_INADDR6(s) (strchr(s, ':') == NULL)
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/* Global functions. */
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#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
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void fromhost(struct request_info *); /* get/validate client host info */
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#else
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#define fromhost sock_host /* no TLI support needed */
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#endif
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int hosts_access(struct request_info *); /* access control */
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int hosts_ctl(char *, char *, char *, char *); /* wrapper around request_init() */
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void shell_cmd(char *); /* execute shell command */
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char *percent_x(char *, int, char *, struct request_info *); /* do %<char> expansion */
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void rfc931(TCPD_SOCKADDR *, TCPD_SOCKADDR *, char *); /* client name from RFC 931 daemon */
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void clean_exit(struct request_info *); /* clean up and exit */
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void refuse(struct request_info *); /* clean up and exit */
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char *xgets(char *, int, FILE *); /* fgets() on steroids */
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char *split_at(char *, int); /* strchr() and split */
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unsigned long dot_quad_addr(char *); /* restricted inet_addr() */
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/* Global variables. */
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extern int allow_severity; /* for connection logging */
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extern int deny_severity; /* for connection logging */
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extern char *hosts_allow_table; /* for verification mode redirection */
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extern char *hosts_deny_table; /* for verification mode redirection */
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extern int hosts_access_verbose; /* for verbose matching mode */
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extern int rfc931_timeout; /* user lookup timeout */
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extern int resident; /* > 0 if resident process */
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/*
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* Routines for controlled initialization and update of request structure
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* attributes. Each attribute has its own key.
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*/
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struct request_info *request_init(struct request_info *,...); /* initialize request */
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struct request_info *request_set(struct request_info *,...); /* update request structure */
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#define RQ_FILE 1 /* file descriptor */
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#define RQ_DAEMON 2 /* server process (argv[0]) */
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#define RQ_USER 3 /* client user name */
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#define RQ_CLIENT_NAME 4 /* client host name */
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#define RQ_CLIENT_ADDR 5 /* client host address */
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#define RQ_CLIENT_SIN 6 /* client endpoint (internal) */
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#define RQ_SERVER_NAME 7 /* server host name */
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#define RQ_SERVER_ADDR 8 /* server host address */
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#define RQ_SERVER_SIN 9 /* server endpoint (internal) */
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/*
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* Routines for delayed evaluation of request attributes. Each attribute
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* type has its own access method. The trivial ones are implemented by
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* macros. The other ones are wrappers around the transport-specific host
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* name, address, and client user lookup methods. The request_info and
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* host_info structures serve as caches for the lookup results.
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*/
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char *eval_user(struct request_info *); /* client user */
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char *eval_hostname(struct host_info *); /* printable hostname */
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char *eval_hostaddr(struct host_info *); /* printable host address */
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char *eval_hostinfo(struct host_info *); /* host name or address */
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char *eval_client(struct request_info *); /* whatever is available */
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char *eval_server(struct request_info *); /* whatever is available */
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#define eval_daemon(r) ((r)->daemon) /* daemon process name */
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#define eval_pid(r) ((r)->pid) /* process id */
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/* Socket-specific methods, including DNS hostname lookups. */
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void sock_host(struct request_info *); /* look up endpoint addresses */
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void sock_hostname(struct host_info *); /* translate address to hostname */
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void sock_hostaddr(struct host_info *); /* address to printable address */
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#define sock_methods(r) \
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{ (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }
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/* The System V Transport-Level Interface (TLI) interface. */
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#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
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void tli_host(struct request_info *); /* look up endpoint addresses etc. */
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#endif
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/*
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* Problem reporting interface. Additional file/line context is reported
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* when available. The jump buffer (tcpd_buf) is not declared here, or
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* everyone would have to include <setjmp.h>.
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*/
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void tcpd_warn(char *, ...); /* report problem and proceed */
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void tcpd_jump(char *, ...); /* report problem and jump */
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struct tcpd_context {
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char *file; /* current file */
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int line; /* current line */
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};
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extern struct tcpd_context tcpd_context;
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/*
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* While processing access control rules, error conditions are handled by
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* jumping back into the hosts_access() routine. This is cleaner than
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* checking the return value of each and every silly little function. The
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* (-1) returns are here because zero is already taken by longjmp().
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*/
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#define AC_PERMIT 1 /* permit access */
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#define AC_DENY (-1) /* deny_access */
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#define AC_ERROR AC_DENY /* XXX */
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/*
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* In verification mode an option function should just say what it would do,
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* instead of really doing it. An option function that would not return
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* should clear the dry_run flag to inform the caller of this unusual
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* behavior.
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*/
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void process_options(char *, struct request_info *); /* execute options */
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extern int dry_run; /* verification flag */
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/* Bug workarounds. */
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#ifdef INET_ADDR_BUG /* inet_addr() returns struct */
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#define inet_addr fix_inet_addr
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long fix_inet_addr(char *);
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#endif
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#ifdef BROKEN_FGETS /* partial reads from sockets */
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#define fgets fix_fgets
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char *fix_fgets(char *, int, FILE *);
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#endif
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#ifdef RECVFROM_BUG /* no address family info */
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#define recvfrom fix_recvfrom
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int fix_recvfrom(int, char *, int, int, struct sockaddr *, int *);
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#endif
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#ifdef GETPEERNAME_BUG /* claims success with UDP */
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#define getpeername fix_getpeername
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int fix_getpeername(int, struct sockaddr *, int *);
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#endif
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#ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */
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#define gethostbyname fix_gethostbyname
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struct hostent *fix_gethostbyname(char *);
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#endif
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#ifdef USE_STRSEP /* libc calls strtok() */
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#define strtok fix_strtok
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char *fix_strtok(char *, char *);
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#endif
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#ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */
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#define strtok my_strtok
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char *my_strtok(char *, char *);
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#endif
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