diff options
Diffstat (limited to 'imap/src/osdep/amiga/env_ami.c')
| -rw-r--r-- | imap/src/osdep/amiga/env_ami.c | 1282 |
1 files changed, 1282 insertions, 0 deletions
diff --git a/imap/src/osdep/amiga/env_ami.c b/imap/src/osdep/amiga/env_ami.c new file mode 100644 index 00000000..843757ed --- /dev/null +++ b/imap/src/osdep/amiga/env_ami.c @@ -0,0 +1,1282 @@ +/* ======================================================================== + * Copyright 1988-2008 University of Washington + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * + * ======================================================================== + */ + +/* + * Program: Amiga environment routines + * + * Author: Mark Crispin + * UW Technology + * Seattle, WA 98195 + * Internet: MRC@Washington.EDU + * + * Date: 1 August 1988 + * Last Edited: 15 May 2008 + */ + +#include <grp.h> +#include <signal.h> +#include <sys/wait.h> + +/* c-client environment parameters */ + +static char *myUserName = NIL; /* user name */ +static char *myHomeDir = NIL; /* home directory name */ +static char *myMailboxDir = NIL;/* mailbox directory name */ +static char *myLocalHost = NIL; /* local host name */ +static char *myNewsrc = NIL; /* newsrc file name */ +static char *mailsubdir = NIL; /* mail subdirectory name */ +static char *sysInbox = NIL; /* system inbox name */ +static char *newsActive = NIL; /* news active file */ +static char *newsSpool = NIL; /* news spool */ + /* anonymous home directory */ +static char *anonymousHome = NIL; +static char *ftpHome = NIL; /* ftp export home directory */ +static char *publicHome = NIL; /* public home directory */ +static char *sharedHome = NIL; /* shared home directory */ +static short anonymous = NIL; /* is anonymous */ +static short restrictBox = NIL; /* is a restricted box */ +static short has_no_life = NIL; /* is a cretin with no life */ + /* block environment init */ +static short block_env_init = NIL; +static short hideDotFiles = NIL;/* hide files whose names start with . */ + /* advertise filesystem root */ +static short advertisetheworld = NIL; + /* disable automatic shared namespaces */ +static short noautomaticsharedns = NIL; +static short no822tztext = NIL; /* disable RFC [2]822 timezone text */ +static short netfsstatbug = NIL;/* compensate for broken stat() on network + * filesystems (AFS and old NFS). Don't do + * this unless you really have to! + */ + /* 1 = disable plaintext, 2 = if not SSL */ +static long disablePlaintext = NIL; +static long list_max_level = 20;/* maximum level of list recursion */ + /* default file protection */ +static long mbx_protection = 0600; + /* default directory protection */ +static long dir_protection = 0700; + /* default lock file protection */ +static long lock_protection = MANDATORYLOCKPROT; + /* default ftp file protection */ +static long ftp_protection = 0644; +static long ftp_dir_protection = 0755; + /* default public file protection */ +static long public_protection = 0666; +static long public_dir_protection = 0777; + /* default shared file protection */ +static long shared_protection = 0660; +static long shared_dir_protection = 0770; +static long locktimeout = 5; /* default lock timeout */ + /* default prototypes */ +static MAILSTREAM *createProto = NIL; +static MAILSTREAM *appendProto = NIL; + /* default user flags */ +static char *userFlags[NUSERFLAGS] = {NIL}; +static NAMESPACE *nslist[3]; /* namespace list */ +static int logtry = 3; /* number of server login tries */ + /* block notification */ +static blocknotify_t mailblocknotify = mm_blocknotify; + +/* Amiga namespaces */ + + /* personal mh namespace */ +static NAMESPACE nsmhf = {"#mh/",'/',NIL,NIL}; +static NAMESPACE nsmh = {"#mhinbox",NIL,NIL,&nsmhf}; + /* home namespace */ +static NAMESPACE nshome = {"",'/',NIL,&nsmh}; + /* Amiga other user namespace */ +static NAMESPACE nsamigaother = {"~",'/',NIL,NIL}; + /* public (anonymous OK) namespace */ +static NAMESPACE nspublic = {"#public/",'/',NIL,NIL}; + /* netnews namespace */ +static NAMESPACE nsnews = {"#news.",'.',NIL,&nspublic}; + /* FTP export namespace */ +static NAMESPACE nsftp = {"#ftp/",'/',NIL,&nsnews}; + /* shared (no anonymous) namespace */ +static NAMESPACE nsshared = {"#shared/",'/',NIL,&nsftp}; + /* world namespace */ +static NAMESPACE nsworld = {"/",'/',NIL,&nsshared}; + +#include "write.c" /* include safe writing routines */ +#include "pmatch.c" /* include wildcard pattern matcher */ + +/* Get all authenticators */ + +#include "auths.c" + +/* Environment manipulate parameters + * Accepts: function code + * function-dependent value + * Returns: function-dependent return value + */ + +void *env_parameters (long function,void *value) +{ + void *ret = NIL; + switch ((int) function) { + case GET_NAMESPACE: + ret = (void *) nslist; + break; + case SET_USERNAME: + if (myUserName) fs_give ((void **) &myUserName); + myUserName = cpystr ((char *) value); + case GET_USERNAME: + ret = (void *) myUserName; + break; + case SET_HOMEDIR: + if (myHomeDir) fs_give ((void **) &myHomeDir); + myHomeDir = cpystr ((char *) value); + case GET_HOMEDIR: + ret = (void *) myHomeDir; + break; + case SET_LOCALHOST: + if (myLocalHost) fs_give ((void **) &myLocalHost); + myLocalHost = cpystr ((char *) value); + case GET_LOCALHOST: + ret = (void *) myLocalHost; + break; + case SET_NEWSRC: + if (myNewsrc) fs_give ((void **) &myNewsrc); + myNewsrc = cpystr ((char *) value); + case GET_NEWSRC: + ret = (void *) myNewsrc; + break; + case SET_NEWSACTIVE: + if (newsActive) fs_give ((void **) &newsActive); + newsActive = cpystr ((char *) value); + case GET_NEWSACTIVE: + ret = (void *) newsActive; + break; + case SET_NEWSSPOOL: + if (newsSpool) fs_give ((void **) &newsSpool); + newsSpool = cpystr ((char *) value); + case GET_NEWSSPOOL: + ret = (void *) newsSpool; + break; + + case SET_ANONYMOUSHOME: + if (anonymousHome) fs_give ((void **) &anonymousHome); + anonymousHome = cpystr ((char *) value); + case GET_ANONYMOUSHOME: + if (!anonymousHome) anonymousHome = cpystr (ANONYMOUSHOME); + ret = (void *) anonymousHome; + break; + case SET_FTPHOME: + if (ftpHome) fs_give ((void **) &ftpHome); + ftpHome = cpystr ((char *) value); + case GET_FTPHOME: + ret = (void *) ftpHome; + break; + case SET_PUBLICHOME: + if (publicHome) fs_give ((void **) &publicHome); + publicHome = cpystr ((char *) value); + case GET_PUBLICHOME: + ret = (void *) publicHome; + break; + case SET_SHAREDHOME: + if (sharedHome) fs_give ((void **) &sharedHome); + sharedHome = cpystr ((char *) value); + case GET_SHAREDHOME: + ret = (void *) sharedHome; + break; + case SET_SYSINBOX: + if (sysInbox) fs_give ((void **) &sysInbox); + sysInbox = cpystr ((char *) value); + case GET_SYSINBOX: + ret = (void *) sysInbox; + break; + case SET_LISTMAXLEVEL: + list_max_level = (long) value; + case GET_LISTMAXLEVEL: + ret = (void *) list_max_level; + break; + + case SET_MBXPROTECTION: + mbx_protection = (long) value; + case GET_MBXPROTECTION: + ret = (void *) mbx_protection; + break; + case SET_DIRPROTECTION: + dir_protection = (long) value; + case GET_DIRPROTECTION: + ret = (void *) dir_protection; + break; + case SET_LOCKPROTECTION: + lock_protection = (long) value; + case GET_LOCKPROTECTION: + ret = (void *) lock_protection; + break; + case SET_FTPPROTECTION: + ftp_protection = (long) value; + case GET_FTPPROTECTION: + ret = (void *) ftp_protection; + break; + case SET_PUBLICPROTECTION: + public_protection = (long) value; + case GET_PUBLICPROTECTION: + ret = (void *) public_protection; + break; + case SET_SHAREDPROTECTION: + shared_protection = (long) value; + case GET_SHAREDPROTECTION: + ret = (void *) shared_protection; + break; + case SET_FTPDIRPROTECTION: + ftp_dir_protection = (long) value; + case GET_FTPDIRPROTECTION: + ret = (void *) ftp_dir_protection; + break; + case SET_PUBLICDIRPROTECTION: + public_dir_protection = (long) value; + case GET_PUBLICDIRPROTECTION: + ret = (void *) public_dir_protection; + break; + case SET_SHAREDDIRPROTECTION: + shared_dir_protection = (long) value; + case GET_SHAREDDIRPROTECTION: + ret = (void *) shared_dir_protection; + break; + + case SET_LOCKTIMEOUT: + locktimeout = (long) value; + case GET_LOCKTIMEOUT: + ret = (void *) locktimeout; + break; + case SET_HIDEDOTFILES: + hideDotFiles = value ? T : NIL; + case GET_HIDEDOTFILES: + ret = (void *) (hideDotFiles ? VOIDT : NIL); + break; + case SET_DISABLEPLAINTEXT: + disablePlaintext = (long) value; + case GET_DISABLEPLAINTEXT: + ret = (void *) disablePlaintext; + break; + case SET_ADVERTISETHEWORLD: + advertisetheworld = value ? T : NIL; + case GET_ADVERTISETHEWORLD: + ret = (void *) (advertisetheworld ? VOIDT : NIL); + break; + case SET_DISABLEAUTOSHAREDNS: + noautomaticsharedns = value ? T : NIL; + case GET_DISABLEAUTOSHAREDNS: + ret = (void *) (noautomaticsharedns ? VOIDT : NIL); + break; + case SET_DISABLE822TZTEXT: + no822tztext = value ? T : NIL; + case GET_DISABLE822TZTEXT: + ret = (void *) (no822tztext ? VOIDT : NIL); + break; + case SET_USERHASNOLIFE: + has_no_life = value ? T : NIL; + case GET_USERHASNOLIFE: + ret = (void *) (has_no_life ? VOIDT : NIL); + break; + case SET_NETFSSTATBUG: + netfsstatbug = value ? T : NIL; + case GET_NETFSSTATBUG: + ret = (void *) (netfsstatbug ? VOIDT : NIL); + break; + case SET_BLOCKENVINIT: + block_env_init = value ? T : NIL; + case GET_BLOCKENVINIT: + ret = (void *) (block_env_init ? VOIDT : NIL); + break; + case SET_BLOCKNOTIFY: + mailblocknotify = (blocknotify_t) value; + case GET_BLOCKNOTIFY: + ret = (void *) mailblocknotify; + break; + } + return ret; +} + +/* Write current time + * Accepts: destination string + * optional format of day-of-week prefix + * format of date and time + * flag whether to append symbolic timezone + */ + +static void do_date (char *date,char *prefix,char *fmt,int suffix) +{ + time_t tn = time (0); + struct tm *t = gmtime (&tn); + int zone = t->tm_hour * 60 + t->tm_min; + int julian = t->tm_yday; + t = localtime (&tn); /* get local time now */ + /* minus UTC minutes since midnight */ + zone = t->tm_hour * 60 + t->tm_min - zone; + /* julian can be one of: + * 36x local time is December 31, UTC is January 1, offset -24 hours + * 1 local time is 1 day ahead of UTC, offset +24 hours + * 0 local time is same day as UTC, no offset + * -1 local time is 1 day behind UTC, offset -24 hours + * -36x local time is January 1, UTC is December 31, offset +24 hours + */ + if (julian = t->tm_yday -julian) + zone += ((julian < 0) == (abs (julian) == 1)) ? -24*60 : 24*60; + if (prefix) { /* want day of week? */ + sprintf (date,prefix,days[t->tm_wday]); + date += strlen (date); /* make next sprintf append */ + } + /* output the date */ + sprintf (date,fmt,t->tm_mday,months[t->tm_mon],t->tm_year+1900, + t->tm_hour,t->tm_min,t->tm_sec,zone/60,abs (zone) % 60); + /* append timezone suffix if desired */ + if (suffix) rfc822_timezone (date,(void *) t); +} + +/* Write current time in RFC 822 format + * Accepts: destination string + */ + +void rfc822_date (char *date) +{ + do_date (date,"%s, ","%d %s %d %02d:%02d:%02d %+03d%02d", + no822tztext ? NIL : T); +} + + +/* Write current time in fixed-width RFC 822 format + * Accepts: destination string + */ + +void rfc822_fixed_date (char *date) +{ + do_date (date,NIL,"%02d %s %4d %02d:%02d:%02d %+03d%02d",NIL); +} + + +/* Write current time in internal format + * Accepts: destination string + */ + +void internal_date (char *date) +{ + do_date (date,NIL,"%02d-%s-%d %02d:%02d:%02d %+03d%02d",NIL); +} + +/* Initialize server + * Accepts: server name for syslog or NIL + * /etc/services service name or NIL + * alternate /etc/services service name or NIL + * clock interrupt handler + * kiss-of-death interrupt handler + * hangup interrupt handler + * termination interrupt handler + */ + +void server_init (char *server,char *service,char *sslservice, + void *clkint,void *kodint,void *hupint,void *trmint, + void *staint) +{ + int onceonly = server && service && sslservice; + if (onceonly) { /* set server name in syslog */ + int mask; + openlog (myServerName = cpystr (server),LOG_PID,syslog_facility); + fclose (stderr); /* possibly save a process ID */ + + switch (mask = umask (022)){/* check old umask */ + case 0: /* definitely unreasonable */ + case 022: /* don't need to change it */ + break; + default: /* already was a reasonable value */ + umask (mask); /* so change it back */ + } + } + arm_signal (SIGALRM,clkint); /* prepare for clock interrupt */ + arm_signal (SIGUSR2,kodint); /* prepare for Kiss Of Death */ + arm_signal (SIGHUP,hupint); /* prepare for hangup */ + arm_signal (SIGPIPE,hupint); /* alternative hangup */ + arm_signal (SIGTERM,trmint); /* prepare for termination */ + /* status dump */ + if (staint) arm_signal (SIGUSR1,staint); + if (onceonly) { /* set up network and maybe SSL */ + long port; + struct servent *sv; + /* Use SSL if SSL service, or if server starts with "s" and not service */ + if (((port = tcp_serverport ()) >= 0)) { + if ((sv = getservbyname (service,"tcp")) && (port == ntohs (sv->s_port))) + syslog (LOG_DEBUG,"%s service init from %s",service,tcp_clientaddr ()); + else if ((sv = getservbyname (sslservice,"tcp")) && + (port == ntohs (sv->s_port))) { + syslog (LOG_DEBUG,"%s SSL service init from %s",sslservice, + tcp_clientaddr ()); + ssl_server_init (server); + } + else { /* not service or SSL service port */ + syslog (LOG_DEBUG,"port %ld service init from %s",port, + tcp_clientaddr ()); + if (*server == 's') ssl_server_init (server); + } + } + } +} + +/* Wait for stdin input + * Accepts: timeout in seconds + * Returns: T if have input on stdin, else NIL + */ + +long server_input_wait (long seconds) +{ + fd_set rfd,efd; + struct timeval tmo; + FD_ZERO (&rfd); + FD_ZERO (&efd); + FD_SET (0,&rfd); + FD_SET (0,&efd); + tmo.tv_sec = seconds; tmo.tv_usec = 0; + return select (1,&rfd,0,&efd,&tmo) ? LONGT : NIL; +} + +/* Return Amiga password entry for user name + * Accepts: user name string + * Returns: password entry + * + * Tries all-lowercase form of user name if given user name fails + */ + +static struct passwd *pwuser (unsigned char *user) +{ + unsigned char *s; + struct passwd *pw = getpwnam (user); + if (!pw) { /* failed, see if any uppercase characters */ + for (s = user; *s && ((*s < 'A') || (*s > 'Z')); s++); + if (*s) { /* yes, try all lowercase form */ + pw = getpwnam (s = lcase (cpystr (user))); + fs_give ((void **) &s); + } + } + return pw; +} + + +/* Validate password for user name + * Accepts: user name string + * password string + * argument count + * argument vector + * Returns: password entry if validated + * + * Tries password+1 if password fails and starts with space + */ + +static struct passwd *valpwd (char *user,char *pwd,int argc,char *argv[]) +{ + char *s; + struct passwd *pw; + struct passwd *ret = NIL; + if (auth_md5.server) { /* using CRAM-MD5 authentication? */ + if (s = auth_md5_pwd (user)) { + if (!strcmp (s,pwd) || ((*pwd == ' ') && pwd[1] && !strcmp (s,pwd+1))) + ret = pwuser (user); /* validated, get passwd entry for user */ + memset (s,0,strlen (s)); /* erase sensitive information */ + fs_give ((void **) &s); + } + } + else if (pw = pwuser (user)) {/* can get user? */ + s = cpystr (pw->pw_name); /* copy returned name in case we need it */ + if (*pwd && !(ret = checkpw (pw,pwd,argc,argv)) && + (*pwd == ' ') && pwd[1] && (ret = pwuser (s))) + ret = checkpw (pw,pwd+1,argc,argv); + fs_give ((void **) &s); /* don't need copy of name any more */ + } + return ret; +} + +/* Server log in + * Accepts: user name string + * password string + * authenticating user name string + * argument count + * argument vector + * Returns: T if password validated, NIL otherwise + */ + +long server_login (char *user,char *pwd,char *authuser,int argc,char *argv[]) +{ + struct passwd *pw = NIL; + int level = LOG_NOTICE; + char *err = "failed"; + /* cretins still haven't given up */ + if ((strlen (user) >= NETMAXUSER) || + (authuser && (strlen (authuser) >= NETMAXUSER))) { + level = LOG_ALERT; /* escalate this alert */ + err = "SYSTEM BREAK-IN ATTEMPT"; + logtry = 0; /* render this session useless */ + } + else if (logtry-- <= 0) err = "excessive login failures"; + else if (disablePlaintext) err = "disabled"; + else if (!(authuser && *authuser)) pw = valpwd (user,pwd,argc,argv); + else if (valpwd (authuser,pwd,argc,argv)) pw = pwuser (user); + if (pw && pw_login (pw,authuser,pw->pw_name,NIL,argc,argv)) return T; + syslog (level|LOG_AUTH,"Login %s user=%.64s auth=%.64s host=%.80s",err, + user,(authuser && *authuser) ? authuser : user,tcp_clienthost ()); + sleep (3); /* slow down possible cracker */ + return NIL; +} + +/* Authenticated server log in + * Accepts: user name string + * authenticating user name string + * argument count + * argument vector + * Returns: T if password validated, NIL otherwise + */ + +long authserver_login (char *user,char *authuser,int argc,char *argv[]) +{ + return pw_login (pwuser (user),authuser,user,NIL,argc,argv); +} + + +/* Log in as anonymous daemon + * Accepts: argument count + * argument vector + * Returns: T if successful, NIL if error + */ + +long anonymous_login (int argc,char *argv[]) +{ + /* log in Mr. A. N. Onymous */ + return pw_login (getpwnam (ANONYMOUSUSER),NIL,NIL, + (char *) mail_parameters (NIL,GET_ANONYMOUSHOME,NIL), + argc,argv); +} + +/* Finish log in and environment initialization + * Accepts: passwd struct for loginpw() + * optional authentication user name + * user name (NIL for anonymous) + * home directory (NIL to use directory from passwd struct) + * argument count + * argument vector + * Returns: T if successful, NIL if error + */ + +long pw_login (struct passwd *pw,char *auser,char *user,char *home,int argc, + char *argv[]) +{ + struct group *gr; + char **t; + long ret = NIL; + if (pw && pw->pw_uid) { /* must have passwd struct for non-UID 0 */ + /* make safe copies of user and home */ + if (user) user = cpystr (pw->pw_name); + home = cpystr (home ? home : pw->pw_dir); + /* authorization ID .NE. authentication ID? */ + if (user && auser && *auser && compare_cstring (auser,user)) { + /* scan list of mail administrators */ + if ((gr = getgrnam (ADMINGROUP)) && (t = gr->gr_mem)) while (*t && !ret) + if (!compare_cstring (auser,*t++)) + ret = pw_login (pw,NIL,user,home,argc,argv); + syslog (LOG_NOTICE|LOG_AUTH,"%s %.80s override of user=%.80s host=%.80s", + ret ? "Admin" : "Failed",auser,user,tcp_clienthost ()); + } + /* normal login */ + else if (((pw->pw_uid == geteuid ()) || loginpw (pw,argc,argv)) && + (ret = env_init (user,home))) chdir (myhomedir ()); + fs_give ((void **) &home); /* clean up */ + if (user) fs_give ((void **) &user); + } + return ret; /* return status */ +} + +/* Initialize environment + * Accepts: user name (NIL for anonymous) + * home directory name + * Returns: T, always + */ + +long env_init (char *user,char *home) +{ + extern MAILSTREAM CREATEPROTO; + extern MAILSTREAM EMPTYPROTO; + struct passwd *pw; + struct stat sbuf; + char tmp[MAILTMPLEN]; + /* don't init if blocked */ + if (block_env_init) return LONGT; + if (myUserName) fatal ("env_init called twice!"); + /* set up user name */ + myUserName = cpystr (user ? user : ANONYMOUSUSER); + if (user) { /* remember user name and home directory */ + nslist[0] = &nshome; /* home namespace */ + nslist[1] = &nsamigaother; + nslist[2] = advertisetheworld ? &nsworld : &nsshared; + } + else { /* anonymous user */ + nslist[0] = nslist[1] = NIL,nslist[2] = &nsftp; + sprintf (tmp,"%s/INBOX", + home = (char *) mail_parameters (NIL,GET_ANONYMOUSHOME,NIL)); + sysInbox = cpystr (tmp); /* make system INBOX */ + anonymous = T; /* flag as anonymous */ + } + myHomeDir = cpystr (home); /* set home directory */ + if (!noautomaticsharedns) { + /* #ftp namespace */ + if (!ftpHome && (pw = getpwnam ("ftp"))) ftpHome = cpystr (pw->pw_dir); + /* #public namespace */ + if (!publicHome && (pw = getpwnam ("imappublic"))) + publicHome = cpystr (pw->pw_dir); + /* #shared namespace */ + if (!anonymous && !sharedHome && (pw = getpwnam ("imapshared"))) + sharedHome = cpystr (pw->pw_dir); + } + if (!myLocalHost) mylocalhost (); + if (!myNewsrc) myNewsrc = cpystr(strcat (strcpy (tmp,myHomeDir),"/.newsrc")); + if (!newsActive) newsActive = cpystr (ACTIVEFILE); + if (!newsSpool) newsSpool = cpystr (NEWSSPOOL); + /* force default prototype to be set */ + if (!createProto) createProto = &CREATEPROTO; + if (!appendProto) appendProto = &EMPTYPROTO; + /* re-do open action to get flags */ + (*createProto->dtb->open) (NIL); + endpwent (); /* close pw database */ + return T; +} + +/* Return my user name + * Accepts: pointer to optional flags + * Returns: my user name + */ + +char *myusername_full (unsigned long *flags) +{ + struct passwd *pw; + struct stat sbuf; + char *s; + unsigned long euid; + char *ret = UNLOGGEDUSER; + /* no user name yet and not root? */ + if (!myUserName && (euid = geteuid ())) { + /* yes, look up getlogin() user name or EUID */ + if (((s = (char *) getlogin ()) && *s && (strlen (s) < NETMAXUSER) && + (pw = getpwnam (s)) && (pw->pw_uid == euid)) || + (pw = getpwuid (euid))) { + if (block_env_init) { /* don't env_init if blocked */ + if (flags) *flags = MU_LOGGEDIN; + return pw->pw_name; + } + env_init (pw->pw_name, + ((s = getenv ("HOME")) && *s && (strlen (s) < NETMAXMBX) && + !stat (s,&sbuf) && ((sbuf.st_mode & S_IFMT) == S_IFDIR)) ? + s : pw->pw_dir); + } + else fatal ("Unable to look up user name"); + } + if (myUserName) { /* logged in? */ + if (flags) *flags = anonymous ? MU_ANONYMOUS : MU_LOGGEDIN; + ret = myUserName; /* return user name */ + } + else if (flags) *flags = MU_NOTLOGGEDIN; + return ret; +} +/* Return my local host name + * Returns: my local host name + */ + +char *mylocalhost () +{ + char tmp[MAILTMPLEN]; + struct hostent *host_name; + if (!myLocalHost) myLocalHost = cpystr (gethostname (tmp,MAILTMPLEN-1) ? + "random-pc" : tcp_canonical (tmp)); + return myLocalHost; +} + +/* Return my home directory name + * Returns: my home directory name + */ + +char *myhomedir () +{ + if (!myHomeDir) myusername ();/* initialize if first time */ + return myHomeDir ? myHomeDir : ""; +} + + +/* Return my home mailbox name + * Returns: my home directory name + */ + +static char *mymailboxdir () +{ + char *home = myhomedir (); + if (!myMailboxDir && home) { /* initialize if first time */ + if (mailsubdir) { + char tmp[MAILTMPLEN]; + sprintf (tmp,"%s/%s",home,mailsubdir); + myMailboxDir = cpystr (tmp);/* use pre-defined subdirectory of home */ + } + else myMailboxDir = cpystr (home); + } + return myMailboxDir ? myMailboxDir : ""; +} + + +/* Return system standard INBOX + * Accepts: buffer string + */ + +char *sysinbox () +{ + char tmp[MAILTMPLEN]; + if (!sysInbox) { /* initialize if first time */ + sprintf (tmp,"%s/%s",MAILSPOOL,myusername ()); + sysInbox = cpystr (tmp); /* system inbox is from mail spool */ + } + return sysInbox; +} + +/* Return mailbox directory name + * Accepts: destination buffer + * directory prefix + * name in directory + * Returns: file name or NIL if error + */ + +char *mailboxdir (char *dst,char *dir,char *name) +{ + char tmp[MAILTMPLEN]; + if (dir || name) { /* if either argument provided */ + if (dir) { + if (strlen (dir) > NETMAXMBX) return NIL; + strcpy (tmp,dir); /* write directory prefix */ + } + else tmp[0] = '\0'; /* otherwise null string */ + if (name) { + if (strlen (name) > NETMAXMBX) return NIL; + strcat (tmp,name); /* write name in directory */ + } + /* validate name, return its name */ + if (!mailboxfile (dst,tmp)) return NIL; + } + /* no arguments, wants mailbox directory */ + else strcpy (dst,mymailboxdir ()); + return dst; /* return the name */ +} + +/* Return mailbox file name + * Accepts: destination buffer + * mailbox name + * Returns: file name or empty string for driver-selected INBOX or NIL if error + */ + +char *mailboxfile (char *dst,char *name) +{ + struct passwd *pw; + char *s; + if (!name || !*name || (*name == '{') || (strlen (name) > NETMAXMBX) || + ((anonymous || restrictBox || (*name == '#')) && + (strstr (name,"..") || strstr (name,"//") || strstr (name,"/~")))) + dst = NIL; /* invalid name */ + else switch (*name) { /* determine mailbox type based upon name */ + case '#': /* namespace name */ + /* #ftp/ namespace */ + if (((name[1] == 'f') || (name[1] == 'F')) && + ((name[2] == 't') || (name[2] == 'T')) && + ((name[3] == 'p') || (name[3] == 'P')) && + (name[4] == '/') && ftpHome) sprintf (dst,"%s/%s",ftpHome,name+5); + /* #public/ and #shared/ namespaces */ + else if ((((name[1] == 'p') || (name[1] == 'P')) && + ((name[2] == 'u') || (name[2] == 'U')) && + ((name[3] == 'b') || (name[3] == 'B')) && + ((name[4] == 'l') || (name[4] == 'L')) && + ((name[5] == 'i') || (name[5] == 'I')) && + ((name[6] == 'c') || (name[6] == 'C')) && + (name[7] == '/') && (s = publicHome)) || + (!anonymous && ((name[1] == 's') || (name[1] == 'S')) && + ((name[2] == 'h') || (name[2] == 'H')) && + ((name[3] == 'a') || (name[3] == 'A')) && + ((name[4] == 'r') || (name[4] == 'R')) && + ((name[5] == 'e') || (name[5] == 'E')) && + ((name[6] == 'd') || (name[6] == 'D')) && + (name[7] == '/') && (s = sharedHome))) + sprintf (dst,"%s/%s",s,compare_cstring (name,"INBOX") ? name : "INBOX"); + else dst = NIL; /* unknown namespace */ + break; + + case '/': /* root access */ + if (anonymous) dst = NIL; /* anonymous forbidden to do this */ + else if ((restrictBox & RESTRICTROOT) && strcmp (name,sysinbox ())) + dst = NIL; /* restricted and not access to sysinbox */ + else strcpy (dst,name); /* unrestricted, copy root name */ + break; + case '~': /* other user access */ + /* bad syntax or anonymous can't win */ + if (!*++name || anonymous) dst = NIL; + /* ~/ equivalent to ordinary name */ + else if (*name == '/') sprintf (dst,"%s/%s",mymailboxdir (),name+1); + /* other user forbidden if restricted */ + else if (restrictBox & RESTRICTOTHERUSER) dst = NIL; + else { /* clear box other user */ + /* copy user name */ + for (s = dst; *name && (*name != '/'); *s++ = *name++); + *s++ = '\0'; /* tie off user name, look up in passwd file */ + if ((pw = getpwnam (dst)) && pw->pw_dir) { + if (*name) name++; /* skip past the slash */ + /* canonicalize case of INBOX */ + if (!compare_cstring (name,"INBOX")) name = "INBOX"; + /* remove trailing / from directory */ + if ((s = strrchr (pw->pw_dir,'/')) && !s[1]) *s = '\0'; + /* don't allow ~root/ if restricted root */ + if ((restrictBox & RESTRICTROOT) && !*pw->pw_dir) dst = NIL; + /* build final name w/ subdir if needed */ + else if (mailsubdir) sprintf (dst,"%s/%s/%s",pw->pw_dir,mailsubdir,name); + else sprintf (dst,"%s/%s",pw->pw_dir,name); + } + else dst = NIL; /* no such user */ + } + break; + case 'I': case 'i': /* possible INBOX */ + if (!compare_cstring (name+1,"NBOX")) { + /* if anonymous, use INBOX in mailbox dir */ + if (anonymous) sprintf (dst,"%s/INBOX",mymailboxdir ()); + else *dst = '\0'; /* otherwise driver selects the name */ + break; + } + /* drop into to ordinary name case */ + default: /* ordinary name is easy */ + sprintf (dst,"%s/%s",mymailboxdir (),name); + break; + } + return dst; /* return final name */ +} + +/* Dot-lock file locker + * Accepts: file name to lock + * destination buffer for lock file name + * open file description on file name to lock + * Returns: T if success, NIL if failure + */ + +long dotlock_lock (char *file,DOTLOCK *base,int fd) +{ + int i = locktimeout * 60; + int j,mask,retry,pi[2],po[2]; + char *s,tmp[MAILTMPLEN]; + struct stat sb; + /* flush absurd file name */ + if (strlen (file) > 512) return NIL; + /* build lock filename */ + sprintf (base->lock,"%s.lock",file); + /* assume no pipe */ + base->pipei = base->pipeo = -1; + do { /* make sure not symlink */ + if (!(j = chk_notsymlink (base->lock,&sb))) return NIL; + /* time out if file older than 5 minutes */ + if ((j > 0) && ((time (0)) >= (sb.st_ctime + locktimeout * 60))) i = 0; + /* try to create the lock */ + if ((j = open (name,O_WRONLY|O_CREAT|O_EXCL,(int) lock_protection)) >= 0) { + close (i); /* make the file, now close it */ + chmod (base->lock,(int) lock_protection); + return LONGT; + } + if (errno == EEXIST) { /* already locked? */ + retry = -1; /* can try again */ + if (!(i%15)) { /* time to notify? */ + sprintf (tmp,"Mailbox %.80s is locked, will override in %d seconds...", + file,i); + mm_log (tmp,WARN); + } + sleep (1); /* wait 1 second before next try */ + } + else retry = i = 0; /* hard failure, no more retries */ + } while (i--); /* until out of retries */ + if (retry < 0) { /* still returning retry after locktimeout? */ + if (!(j = chk_notsymlink (base->lock,&sb))) return NIL; + if ((j > 0) && ((time (0)) < (sb.st_ctime + locktimeout * 60))) { + sprintf (tmp,"Mailbox vulnerable - seizing %ld second old lock", + (long) (time (0) - sb.st_ctime)); + mm_log (tmp,WARN); + } + mask = umask (0); + unlink (base->lock); /* try to remove the old file */ + /* seize the lock */ + if ((i = open (base->lock,O_WRONLY|O_CREAT,(int) lock_protection)) >= 0) { + close (i); /* don't need descriptor any more */ + sprintf (tmp,"Mailbox %.80s lock overridden",file); + mm_log (tmp,NIL); + chmod (base->lock,(int) lock_protection); + umask (mask) /* restore old umask */ + return LONGT; + } + umask (mask) /* restore old umask */ + } + + if (fd >= 0) switch (errno) { + case EACCES: /* protection failure? */ + /* make command pipes */ + if (!stat (LOCKPGM,&sb) && (pipe (pi) >= 0)) { + /* if input pipes usable create output pipes */ + if ((pi[0] < FD_SETSIZE) && (pi[1] < FD_SETSIZE) && (pipe (po) >= 0)) { + /* make sure output pipes are usable */ + if ((po[0] >= FD_SETSIZE) || (po[1] >= FD_SETSIZE)); + /* all is good, make inferior process */ + else if (!(j = fork ())) { + if (!fork ()) { /* make grandchild so it's inherited by init */ + long cf; /* don't change caller vars in case vfork() */ + char *argv[4],arg[20]; + /* prepare argument vector */ + sprintf (arg,"%d",fd); + argv[0] = LOCKPGM; argv[1] = arg; + argv[2] = file; argv[3] = NIL; + /* set parent's I/O to my O/I */ + dup2 (pi[1],1); dup2 (pi[1],2); dup2 (po[0],0); + /* close all unnecessary descriptors */ + for (cf = max (20,max (max (pi[0],pi[1]),max(po[0],po[1]))); + cf >= 3; --cf) if (cf != fd) close (cf); + /* be our own process group */ + setpgrp (0,getpid ()); + /* now run it */ + _exit (execv (argv[0],argv)); + } + _exit (1); /* child is done */ + } + else if (j > 0) { /* parent process */ + fd_set rfd; + struct timeval tmo; + FD_ZERO (&rfd); + FD_SET (pi[0],&rfd); + tmo.tv_sec = locktimeout * 60; + grim_pid_reap (j,NIL);/* reap child; grandchild now owned by init */ + /* read response from locking program */ + if (select (pi[0]+1,&rfd,0,0,&tmo) && + (read (pi[0],tmp,1) == 1) && (tmp[0] == '+')) { + /* success, record pipes */ + base->pipei = pi[0]; base->pipeo = po[1]; + /* close child's side of the pipes */ + close (pi[1]); close (po[0]); + return LONGT; + } + } + close (po[0]); close (po[1]); + } + close (pi[0]); close (pi[1]); + } + /* find directory/file delimiter */ + if (s = strrchr (base->lock,'/')) { + *s = '\0'; /* tie off at directory */ + sprintf(tmp, /* generate default message */ + "Mailbox vulnerable - directory %.80s must have 1777 protection", + base->lock); + /* definitely not 1777 if can't stat */ + mask = stat (base->lock,&sb) ? 0 : (sb.st_mode & 1777); + *s = '/'; /* restore lock name */ + if (mask != 1777) { /* default warning if not 1777 */ + MM_LOG (tmp,WARN); + break; + } + } + default: + sprintf (tmp,"Mailbox vulnerable - error creating %.80s: %s", + base->lock,strerror (errno)); + mm_log (tmp,WARN); /* this is probably not good */ + break; + } + base->lock[0] = '\0'; /* don't use lock files */ + return NIL; +} + +/* Dot-lock file unlocker + * Accepts: lock file name + * Returns: T if success, NIL if failure + */ + +long dotlock_unlock (DOTLOCK *base) +{ + long ret = LONGT; + if (base && base->lock[0]) { + if (base->pipei >= 0) { /* if running through a pipe unlocker */ + ret = (write (base->pipeo,"+",1) == 1); + /* nuke the pipes */ + close (base->pipei); close (base->pipeo); + } + else ret = !unlink (base->lock); + } + return ret; +} + +/* Lock file name + * Accepts: scratch buffer + * file name + * type of locking operation (LOCK_SH or LOCK_EX) + * pointer to return PID of locker + * Returns: file descriptor of lock or negative if error + */ + +int lockname (char *lock,char *fname,int op,long *pid) +{ + struct stat sbuf; + *pid = 0; /* no locker PID */ + return stat (fname,&sbuf) ? -1 : lock_work (lock,&sbuf,op,pid); +} + + +/* Lock file descriptor + * Accepts: file descriptor + * lock file name buffer + * type of locking operation (LOCK_SH or LOCK_EX) + * Returns: file descriptor of lock or negative if error + */ + +int lockfd (int fd,char *lock,int op) +{ + struct stat sbuf; + return fstat (fd,&sbuf) ? -1 : lock_work (lock,&sbuf,op,NIL); +} + +/* Lock file name worker + * Accepts: lock file name + * pointer to stat() buffer + * type of locking operation (LOCK_SH or LOCK_EX) + * pointer to return PID of locker + * Returns: file descriptor of lock or negative if error + */ + +int lock_work (char *lock,void *sb,int op,long *pid) +{ + struct stat lsb,fsb; + struct stat *sbuf = (struct stat *) sb; + char tmp[MAILTMPLEN]; + long i; + int fd; + int mask = umask (0); + if (pid) *pid = 0; /* initialize return PID */ + /* make temporary lock file name */ + sprintf (lock,"%s/.%lx.%lx","/tmp", + (unsigned long) sbuf->st_dev,(unsigned long) sbuf->st_ino); + while (T) { /* until get a good lock */ + do switch ((int) chk_notsymlink (lock,&lsb)) { + case 1: /* exists just once */ + if (((fd = open (lock,O_RDWR,lock_protection)) >= 0) || + (errno != ENOENT) || (chk_notsymlink (lock,&lsb) >= 0)) break; + case -1: /* name doesn't exist */ + fd = open (lock,O_RDWR|O_CREAT|O_EXCL,lock_protection); + break; + default: /* multiple hard links */ + mm_log ("hard link to lock name",ERROR); + syslog (LOG_CRIT,"SECURITY PROBLEM: hard link to lock name: %.80s",lock); + case 0: /* symlink (already did syslog) */ + umask (mask); /* restore old mask */ + return -1; /* fail: no lock file */ + } while ((fd < 0) && (errno == EEXIST)); + if (fd < 0) { /* failed to get file descriptor */ + syslog (LOG_INFO,"Mailbox lock file %s open failure: %s",lock, + strerror (errno)); + if (stat ("/tmp",&lsb)) + syslog (LOG_CRIT,"SYSTEM ERROR: no /tmp: %s",strerror (errno)); + else if ((lsb.st_mode & 01777) != 01777) + mm_log ("Can't lock for write: /tmp must have 1777 protection",WARN); + umask (mask); /* restore old mask */ + return -1; /* fail: can't open lock file */ + } + + /* non-blocking form */ + if (op & LOCK_NB) i = flock (fd,op); + else { /* blocking form */ + (*mailblocknotify) (BLOCK_FILELOCK,NIL); + i = flock (fd,op); + (*mailblocknotify) (BLOCK_NONE,NIL); + } + if (i) { /* failed, get other process' PID */ + if (pid && !fstat (fd,&fsb) && (i = min (fsb.st_size,MAILTMPLEN-1)) && + (read (fd,tmp,i) == i) && !(tmp[i] = 0) && ((i = atol (tmp)) > 0)) + *pid = i; + close (fd); /* failed, give up on lock */ + umask (mask); /* restore old mask */ + return -1; /* fail: can't lock */ + } + /* make sure this lock is good for us */ + if (!lstat (lock,&lsb) && ((lsb.st_mode & S_IFMT) != S_IFLNK) && + !fstat (fd,&fsb) && (lsb.st_dev == fsb.st_dev) && + (lsb.st_ino == fsb.st_ino) && (fsb.st_nlink == 1)) break; + close (fd); /* lock not right, drop fd and try again */ + } + /* make sure mode OK (don't use fchmod()) */ + chmod (lock,(int) lock_protection); + umask (mask); /* restore old mask */ + return fd; /* success */ +} + +/* Check to make sure not a symlink + * Accepts: file name + * stat buffer + * Returns: -1 if doesn't exist, NIL if symlink, else number of hard links + */ + +long chk_notsymlink (char *name,void *sb) +{ + struct stat *sbuf = (struct stat *) sb; + /* name exists? */ + if (lstat (name,sbuf)) return -1; + /* forbid symbolic link */ + if ((sbuf->st_mode & S_IFMT) == S_IFLNK) { + mm_log ("symbolic link on lock name",ERROR); + syslog (LOG_CRIT,"SECURITY PROBLEM: symbolic link on lock name: %.80s", + name); + return NIL; + } + return (long) sbuf->st_nlink; /* return number of hard links */ +} + + +/* Unlock file descriptor + * Accepts: file descriptor + * lock file name from lockfd() + */ + +void unlockfd (int fd,char *lock) +{ + /* delete the file if no sharers */ + if (!flock (fd,LOCK_EX|LOCK_NB)) unlink (lock); + flock (fd,LOCK_UN); /* unlock it */ + close (fd); /* close it */ +} + +/* Set proper file protection for mailbox + * Accepts: mailbox name + * actual file path name + * Returns: T, always + */ + +long set_mbx_protections (char *mailbox,char *path) +{ + struct stat sbuf; + int mode = (int) mbx_protection; + if (*mailbox == '#') { /* possible namespace? */ + if (((mailbox[1] == 'f') || (mailbox[1] == 'F')) && + ((mailbox[2] == 't') || (mailbox[2] == 'T')) && + ((mailbox[3] == 'p') || (mailbox[3] == 'P')) && + (mailbox[4] == '/')) mode = (int) ftp_protection; + else if (((mailbox[1] == 'p') || (mailbox[1] == 'P')) && + ((mailbox[2] == 'u') || (mailbox[2] == 'U')) && + ((mailbox[3] == 'b') || (mailbox[3] == 'B')) && + ((mailbox[4] == 'l') || (mailbox[4] == 'L')) && + ((mailbox[5] == 'i') || (mailbox[5] == 'I')) && + ((mailbox[6] == 'c') || (mailbox[6] == 'C')) && + (mailbox[7] == '/')) mode = (int) public_protection; + else if (((mailbox[1] == 's') || (mailbox[1] == 'S')) && + ((mailbox[2] == 'h') || (mailbox[2] == 'H')) && + ((mailbox[3] == 'a') || (mailbox[3] == 'A')) && + ((mailbox[4] == 'r') || (mailbox[4] == 'R')) && + ((mailbox[5] == 'e') || (mailbox[5] == 'E')) && + ((mailbox[6] == 'd') || (mailbox[6] == 'D')) && + (mailbox[7] == '/')) mode = (int) shared_protection; + } + /* if a directory */ + if (!stat (path,&sbuf) && ((sbuf.st_mode & S_IFMT) == S_IFDIR)) { + /* set owner search if allow read or write */ + if (mode & 0600) mode |= 0100; + if (mode & 060) mode |= 010;/* set group search if allow read or write */ + if (mode & 06) mode |= 01; /* set world search if allow read or write */ + /* preserve directory SGID bit */ + if (sbuf.st_mode & S_ISGID) mode |= S_ISGID; + } + chmod (path,mode); /* set the new protection, ignore failure */ + return LONGT; +} + +/* Get proper directory protection + * Accepts: mailbox name + * Returns: directory mode, always + */ + +long get_dir_protection (char *mailbox) +{ + if (*mailbox == '#') { /* possible namespace? */ + if (((mailbox[1] == 'f') || (mailbox[1] == 'F')) && + ((mailbox[2] == 't') || (mailbox[2] == 'T')) && + ((mailbox[3] == 'p') || (mailbox[3] == 'P')) && + (mailbox[4] == '/')) return ftp_dir_protection; + else if (((mailbox[1] == 'p') || (mailbox[1] == 'P')) && + ((mailbox[2] == 'u') || (mailbox[2] == 'U')) && + ((mailbox[3] == 'b') || (mailbox[3] == 'B')) && + ((mailbox[4] == 'l') || (mailbox[4] == 'L')) && + ((mailbox[5] == 'i') || (mailbox[5] == 'I')) && + ((mailbox[6] == 'c') || (mailbox[6] == 'C')) && + (mailbox[7] == '/')) return public_dir_protection; + else if (((mailbox[1] == 's') || (mailbox[1] == 'S')) && + ((mailbox[2] == 'h') || (mailbox[2] == 'H')) && + ((mailbox[3] == 'a') || (mailbox[3] == 'A')) && + ((mailbox[4] == 'r') || (mailbox[4] == 'R')) && + ((mailbox[5] == 'e') || (mailbox[5] == 'E')) && + ((mailbox[6] == 'd') || (mailbox[6] == 'D')) && + (mailbox[7] == '/')) return shared_dir_protection; + } + return dir_protection; +} + +/* Determine default prototype stream to user + * Accepts: type (NIL for create, T for append) + * Returns: default prototype stream + */ + +MAILSTREAM *default_proto (long type) +{ + myusername (); /* make sure initialized */ + /* return default driver's prototype */ + return type ? appendProto : createProto; +} + + +/* Set up user flags for stream + * Accepts: MAIL stream + * Returns: MAIL stream with user flags set up + */ + +MAILSTREAM *user_flags (MAILSTREAM *stream) +{ + int i; + myusername (); /* make sure initialized */ + for (i = 0; i < NUSERFLAGS && userFlags[i]; ++i) + if (!stream->user_flags[i]) stream->user_flags[i] = cpystr (userFlags[i]); + return stream; +} + + +/* Return nth user flag + * Accepts: user flag number + * Returns: flag + */ + +char *default_user_flag (unsigned long i) +{ + myusername (); /* make sure initialized */ + return userFlags[i]; +} + +/* Default block notify routine + * Accepts: reason for calling + * data + * Returns: data + */ + +void *mm_blocknotify (int reason,void *data) +{ + void *ret = data; + switch (reason) { + case BLOCK_SENSITIVE: /* entering sensitive code */ + ret = (void *) alarm (0); + break; + case BLOCK_NONSENSITIVE: /* exiting sensitive code */ + if ((unsigned int) data) alarm ((unsigned int) data); + break; + default: /* ignore all other reasons */ + break; + } + return ret; +} |