/* * Copyright (c) 1998-2002 Sendmail, Inc. and its suppliers. * All rights reserved. * Copyright (c) 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * * By using this file, you agree to the terms and conditions set * forth in the LICENSE file which can be found at the top level of * the sendmail distribution. * * $FreeBSD$ * */ #include SM_IDSTR(copyright, "@(#) Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.\n\ All rights reserved.\n\ Copyright (c) 1990, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n") SM_IDSTR(id, "@(#)$Id: mail.local.c,v 8.239.2.2 2002/09/24 02:09:09 ca Exp $") #include #include #include #include # include # ifdef EX_OK # undef EX_OK /* unistd.h may have another use for this */ # endif /* EX_OK */ #include #include /* ** This is not intended to work on System V derived systems ** such as Solaris or HP-UX, since they use a totally different ** approach to mailboxes (essentially, they have a set-group-ID program ** rather than set-user-ID, and they rely on the ability to "give away" ** files to do their work). IT IS NOT A BUG that this doesn't ** work on such architectures. */ #include #include #include #include #include #include #include # include # include # include # include # include # include #include #include #include #include #include /* additional mode for open() */ # define EXTRA_MODE 0 #ifndef LOCKTO_RM # define LOCKTO_RM 300 /* timeout for stale lockfile removal */ #endif /* ! LOCKTO_RM */ #ifndef LOCKTO_GLOB # define LOCKTO_GLOB 400 /* global timeout for lockfile creation */ #endif /* ! LOCKTO_GLOB */ /* define a realloc() which works for NULL pointers */ #define REALLOC(ptr, size) (((ptr) == NULL) ? malloc(size) : realloc(ptr, size)) /* ** If you don't have flock, you could try using lockf instead. */ #ifdef LDA_USE_LOCKF # define flock(a, b) lockf(a, b, 0) # ifdef LOCK_EX # undef LOCK_EX # endif /* LOCK_EX */ # define LOCK_EX F_LOCK #endif /* LDA_USE_LOCKF */ #ifndef LOCK_EX # include #endif /* ! LOCK_EX */ /* ** If you don't have setreuid, and you have saved uids, and you have ** a seteuid() call that doesn't try to emulate using setuid(), then ** you can try defining LDA_USE_SETEUID. */ #ifdef LDA_USE_SETEUID # define setreuid(r, e) seteuid(e) #endif /* LDA_USE_SETEUID */ #ifdef LDA_CONTENTLENGTH # define CONTENTLENGTH 1 #endif /* LDA_CONTENTLENGTH */ #ifndef INADDRSZ # define INADDRSZ 4 /* size of an IPv4 address in bytes */ #endif /* ! INADDRSZ */ #ifdef MAILLOCK # include #endif /* MAILLOCK */ #ifndef MAILER_DAEMON # define MAILER_DAEMON "MAILER-DAEMON" #endif /* ! MAILER_DAEMON */ #ifdef CONTENTLENGTH char ContentHdr[40] = "Content-Length: "; off_t HeaderLength; off_t BodyLength; #endif /* CONTENTLENGTH */ bool EightBitMime = true; /* advertise 8BITMIME in LMTP */ char ErrBuf[10240]; /* error buffer */ int ExitVal = EX_OK; /* sysexits.h error value. */ bool nobiff = false; bool nofsync = false; bool HoldErrs = false; /* Hold errors in ErrBuf */ bool LMTPMode = false; bool BounceQuota = false; /* permanent error when over quota */ char *HomeMailFile = NULL; /* store mail in homedir */ void deliver __P((int, char *)); int e_to_sys __P((int)); void notifybiff __P((char *)); int store __P((char *, bool *)); void usage __P((void)); int lockmbox __P((char *)); void unlockmbox __P((void)); void mailerr __P((const char *, const char *, ...)); void flush_error __P((void)); int main(argc, argv) int argc; char *argv[]; { struct passwd *pw; int ch, fd; uid_t uid; char *from; char *mbdbname = "pw"; int err; extern char *optarg; extern int optind; /* make sure we have some open file descriptors */ for (fd = 10; fd < 30; fd++) (void) close(fd); /* use a reasonable umask */ (void) umask(0077); # ifdef LOG_MAIL openlog("mail.local", 0, LOG_MAIL); # else /* LOG_MAIL */ openlog("mail.local", 0); # endif /* LOG_MAIL */ from = NULL; while ((ch = getopt(argc, argv, "7BbdD:f:h:r:ls")) != -1) { switch(ch) { case '7': /* Do not advertise 8BITMIME */ EightBitMime = false; break; case 'B': nobiff = true; break; case 'b': /* bounce mail when over quota. */ BounceQuota = true; break; case 'd': /* Backward compatible. */ break; case 'D': /* mailbox database type */ mbdbname = optarg; break; case 'f': case 'r': /* Backward compatible. */ if (from != NULL) { mailerr(NULL, "Multiple -f options"); usage(); } from = optarg; break; case 'h': if (optarg != NULL || *optarg != '\0') HomeMailFile = optarg; else { mailerr(NULL, "-h: missing filename"); usage(); } break; case 'l': LMTPMode = true; break; case 's': nofsync++; break; case '?': default: usage(); } } argc -= optind; argv += optind; /* initialize biff structures */ if (!nobiff) notifybiff(NULL); err = sm_mbdb_initialize(mbdbname); if (err != EX_OK) { char *errcode = "521"; if (err == EX_TEMPFAIL) errcode = "421"; mailerr(errcode, "Can not open mailbox database %s: %s", mbdbname, sm_strexit(err)); exit(err); } if (LMTPMode) { extern void dolmtp __P((void)); if (argc > 0) { mailerr("421", "Users should not be specified in command line if LMTP required"); exit(EX_TEMPFAIL); } dolmtp(); /* NOTREACHED */ exit(EX_OK); } /* Non-LMTP from here on out */ if (*argv == '\0') usage(); /* ** If from not specified, use the name from getlogin() if the ** uid matches, otherwise, use the name from the password file ** corresponding to the uid. */ uid = getuid(); if (from == NULL && ((from = getlogin()) == NULL || (pw = getpwnam(from)) == NULL || pw->pw_uid != uid)) from = (pw = getpwuid(uid)) != NULL ? pw->pw_name : "???"; /* ** There is no way to distinguish the error status of one delivery ** from the rest of the deliveries. So, if we failed hard on one ** or more deliveries, but had no failures on any of the others, we ** return a hard failure. If we failed temporarily on one or more ** deliveries, we return a temporary failure regardless of the other ** failures. This results in the delivery being reattempted later ** at the expense of repeated failures and multiple deliveries. */ HoldErrs = true; fd = store(from, NULL); HoldErrs = false; if (fd < 0) { flush_error(); exit(ExitVal); } for (; *argv != NULL; ++argv) deliver(fd, *argv); exit(ExitVal); /* NOTREACHED */ return ExitVal; } char * parseaddr(s, rcpt) char *s; bool rcpt; { char *p; int l; if (*s++ != '<') return NULL; p = s; /* at-domain-list */ while (*p == '@') { p++; while (*p != ',' && *p != ':' && *p != '\0') p++; if (*p == '\0') return NULL; /* Skip over , or : */ p++; } s = p; /* local-part */ while (*p != '\0' && *p != '@' && *p != '>') { if (*p == '\\') { if (*++p == '\0') return NULL; } else if (*p == '\"') { p++; while (*p != '\0' && *p != '\"') { if (*p == '\\') { if (*++p == '\0') return NULL; } p++; } if (*p == '\0' || *(p + 1) == '\0') return NULL; } /* +detail ? */ if (*p == '+' && rcpt) *p = '\0'; p++; } /* @domain */ if (*p == '@') { if (rcpt) *p++ = '\0'; while (*p != '\0' && *p != '>') p++; } if (*p != '>') return NULL; else *p = '\0'; p++; if (*p != '\0' && *p != ' ') return NULL; if (*s == '\0') s = MAILER_DAEMON; l = strlen(s) + 1; if (l < 0) return NULL; p = malloc(l); if (p == NULL) { mailerr("421 4.3.0", "Memory exhausted"); exit(EX_TEMPFAIL); } (void) sm_strlcpy(p, s, l); return p; } char * process_recipient(addr) char *addr; { SM_MBDB_T user; switch (sm_mbdb_lookup(addr, &user)) { case EX_OK: return NULL; case EX_NOUSER: return "550 5.1.1 User unknown"; case EX_TEMPFAIL: return "451 4.3.0 User database failure; retry later"; default: return "550 5.3.0 User database failure"; } } #define RCPT_GROW 30 void dolmtp() { char *return_path = NULL; char **rcpt_addr = NULL; int rcpt_num = 0; int rcpt_alloc = 0; bool gotlhlo = false; char *err; int msgfd; char *p; int i; char myhostname[1024]; char buf[4096]; memset(myhostname, '\0', sizeof myhostname); (void) gethostname(myhostname, sizeof myhostname - 1); if (myhostname[0] == '\0') sm_strlcpy(myhostname, "localhost", sizeof myhostname); printf("220 %s LMTP ready\r\n", myhostname); for (;;) { (void) fflush(stdout); if (fgets(buf, sizeof(buf) - 1, stdin) == NULL) exit(EX_OK); p = buf + strlen(buf) - 1; if (p >= buf && *p == '\n') *p-- = '\0'; if (p >= buf && *p == '\r') *p-- = '\0'; switch (buf[0]) { case 'd': case 'D': if (sm_strcasecmp(buf, "data") == 0) { bool inbody = false; if (rcpt_num == 0) { mailerr("503 5.5.1", "No recipients"); continue; } HoldErrs = true; msgfd = store(return_path, &inbody); HoldErrs = false; if (msgfd < 0 && !inbody) { flush_error(); continue; } for (i = 0; i < rcpt_num; i++) { if (msgfd < 0) { /* print error for rcpt */ flush_error(); continue; } p = strchr(rcpt_addr[i], '+'); if (p != NULL) *p = '\0'; deliver(msgfd, rcpt_addr[i]); } if (msgfd >= 0) (void) close(msgfd); goto rset; } goto syntaxerr; /* NOTREACHED */ break; case 'l': case 'L': if (sm_strncasecmp(buf, "lhlo ", 5) == 0) { /* check for duplicate per RFC 1651 4.2 */ if (gotlhlo) { mailerr("503", "%s Duplicate LHLO", myhostname); continue; } gotlhlo = true; printf("250-%s\r\n", myhostname); if (EightBitMime) printf("250-8BITMIME\r\n"); printf("250-ENHANCEDSTATUSCODES\r\n"); printf("250 PIPELINING\r\n"); continue; } goto syntaxerr; /* NOTREACHED */ break; case 'm': case 'M': if (sm_strncasecmp(buf, "mail ", 5) == 0) { if (return_path != NULL) { mailerr("503 5.5.1", "Nested MAIL command"); continue; } if (sm_strncasecmp(buf + 5, "from:", 5) != 0 || ((return_path = parseaddr(buf + 10, false)) == NULL)) { mailerr("501 5.5.4", "Syntax error in parameters"); continue; } printf("250 2.5.0 Ok\r\n"); continue; } goto syntaxerr; /* NOTREACHED */ break; case 'n': case 'N': if (sm_strcasecmp(buf, "noop") == 0) { printf("250 2.0.0 Ok\r\n"); continue; } goto syntaxerr; /* NOTREACHED */ break; case 'q': case 'Q': if (sm_strcasecmp(buf, "quit") == 0) { printf("221 2.0.0 Bye\r\n"); exit(EX_OK); } goto syntaxerr; /* NOTREACHED */ break; case 'r': case 'R': if (sm_strncasecmp(buf, "rcpt ", 5) == 0) { if (return_path == NULL) { mailerr("503 5.5.1", "Need MAIL command"); continue; } if (rcpt_num >= rcpt_alloc) { rcpt_alloc += RCPT_GROW; rcpt_addr = (char **) REALLOC((char *) rcpt_addr, rcpt_alloc * sizeof(char **)); if (rcpt_addr == NULL) { mailerr("421 4.3.0", "Memory exhausted"); exit(EX_TEMPFAIL); } } if (sm_strncasecmp(buf + 5, "to:", 3) != 0 || ((rcpt_addr[rcpt_num] = parseaddr(buf + 8, true)) == NULL)) { mailerr("501 5.5.4", "Syntax error in parameters"); continue; } err = process_recipient(rcpt_addr[rcpt_num]); if (err != NULL) { mailerr(NULL, "%s", err); continue; } rcpt_num++; printf("250 2.1.5 Ok\r\n"); continue; } else if (sm_strcasecmp(buf, "rset") == 0) { printf("250 2.0.0 Ok\r\n"); rset: while (rcpt_num > 0) free(rcpt_addr[--rcpt_num]); if (return_path != NULL) free(return_path); return_path = NULL; continue; } goto syntaxerr; /* NOTREACHED */ break; case 'v': case 'V': if (sm_strncasecmp(buf, "vrfy ", 5) == 0) { printf("252 2.3.3 Try RCPT to attempt delivery\r\n"); continue; } goto syntaxerr; /* NOTREACHED */ break; default: syntaxerr: mailerr("500 5.5.2", "Syntax error"); continue; /* NOTREACHED */ break; } } } int store(from, inbody) char *from; bool *inbody; { FILE *fp = NULL; time_t tval; bool eline; /* previous line was empty */ bool fullline = true; /* current line is terminated */ bool prevfl; /* previous line was terminated */ char line[2048]; int fd; char tmpbuf[sizeof _PATH_LOCTMP + 1]; if (inbody != NULL) *inbody = false; (void) umask(0077); (void) sm_strlcpy(tmpbuf, _PATH_LOCTMP, sizeof tmpbuf); if ((fd = mkstemp(tmpbuf)) < 0 || (fp = fdopen(fd, "w+")) == NULL) { if (fd >= 0) (void) close(fd); mailerr("451 4.3.0", "Unable to open temporary file"); return -1; } (void) unlink(tmpbuf); if (LMTPMode) { printf("354 Go ahead\r\n"); (void) fflush(stdout); } if (inbody != NULL) *inbody = true; (void) time(&tval); (void) fprintf(fp, "From %s %s", from, ctime(&tval)); #ifdef CONTENTLENGTH HeaderLength = 0; BodyLength = -1; #endif /* CONTENTLENGTH */ line[0] = '\0'; eline = true; while (fgets(line, sizeof(line), stdin) != (char *) NULL) { size_t line_len = 0; int peek; prevfl = fullline; /* preserve state of previous line */ while (line[line_len] != '\n' && line_len < sizeof(line) - 2) line_len++; line_len++; /* Check for dot-stuffing */ if (prevfl && LMTPMode && line[0] == '.') { if (line[1] == '\n' || (line[1] == '\r' && line[2] == '\n')) goto lmtpdot; memcpy(line, line + 1, line_len); line_len--; } /* Check to see if we have the full line from fgets() */ fullline = false; if (line_len > 0) { if (line[line_len - 1] == '\n') { if (line_len >= 2 && line[line_len - 2] == '\r') { line[line_len - 2] = '\n'; line[line_len - 1] = '\0'; line_len--; } fullline = true; } else if (line[line_len - 1] == '\r') { /* Did we just miss the CRLF? */ peek = fgetc(stdin); if (peek == '\n') { line[line_len - 1] = '\n'; fullline = true; } else (void) ungetc(peek, stdin); } } else fullline = true; #ifdef CONTENTLENGTH if (prevfl && line[0] == '\n' && HeaderLength == 0) { eline = false; if (fp != NULL) HeaderLength = ftell(fp); if (HeaderLength <= 0) { /* ** shouldn't happen, unless ftell() is ** badly broken */ HeaderLength = -1; } } #else /* CONTENTLENGTH */ if (prevfl && line[0] == '\n') eline = true; #endif /* CONTENTLENGTH */ else { if (eline && line[0] == 'F' && fp != NULL && !memcmp(line, "From ", 5)) (void) putc('>', fp); eline = false; #ifdef CONTENTLENGTH /* discard existing "Content-Length:" headers */ if (prevfl && HeaderLength == 0 && (line[0] == 'C' || line[0] == 'c') && sm_strncasecmp(line, ContentHdr, 15) == 0) { /* ** be paranoid: clear the line ** so no "wrong matches" may occur later */ line[0] = '\0'; continue; } #endif /* CONTENTLENGTH */ } if (fp != NULL) { (void) fwrite(line, sizeof(char), line_len, fp); if (ferror(fp)) { mailerr("451 4.3.0", "Temporary file write error"); (void) fclose(fp); fp = NULL; continue; } } } /* check if an error occurred */ if (fp == NULL) return -1; if (LMTPMode) { /* Got a premature EOF -- toss message and exit */ exit(EX_OK); } /* If message not newline terminated, need an extra. */ if (fp != NULL && strchr(line, '\n') == NULL) (void) putc('\n', fp); lmtpdot: #ifdef CONTENTLENGTH if (fp != NULL) BodyLength = ftell(fp); if (HeaderLength == 0 && BodyLength > 0) /* empty body */ { HeaderLength = BodyLength; BodyLength = 0; } else BodyLength = BodyLength - HeaderLength - 1 ; if (HeaderLength > 0 && BodyLength >= 0) { (void) sm_snprintf(line, sizeof line, "%lld\n", (LONGLONG_T) BodyLength); (void) sm_strlcpy(&ContentHdr[16], line, sizeof(ContentHdr) - 16); } else BodyLength = -1; /* Something is wrong here */ #endif /* CONTENTLENGTH */ /* Output a newline; note, empty messages are allowed. */ if (fp != NULL) (void) putc('\n', fp); if (fp == NULL || fflush(fp) == EOF || ferror(fp) != 0) { mailerr("451 4.3.0", "Temporary file write error"); if (fp != NULL) (void) fclose(fp); return -1; } return fd; } void deliver(fd, name) int fd; char *name; { struct stat fsb; struct stat sb; char path[MAXPATHLEN]; int mbfd = -1, nr = 0, nw, off; int exitval; char *p; char *errcode; off_t curoff; #ifdef CONTENTLENGTH off_t headerbytes; int readamount; #endif /* CONTENTLENGTH */ char biffmsg[100], buf[8 * 1024]; SM_MBDB_T user; /* ** Disallow delivery to unknown names -- special mailboxes can be ** handled in the sendmail aliases file. */ exitval = sm_mbdb_lookup(name, &user); switch (exitval) { case EX_OK: break; case EX_NOUSER: exitval = EX_UNAVAILABLE; mailerr("550 5.1.1", "%s: User unknown", name); break; case EX_TEMPFAIL: mailerr("451 4.3.0", "%s: User database failure; retry later", name); break; default: exitval = EX_UNAVAILABLE; mailerr("550 5.3.0", "%s: User database failure", name); break; } if (exitval != EX_OK) { if (ExitVal != EX_TEMPFAIL) ExitVal = exitval; return; } endpwent(); /* ** Keep name reasonably short to avoid buffer overruns. ** This isn't necessary on BSD because of the proper ** definition of snprintf(), but it can cause problems ** on other systems. ** Also, clear out any bogus characters. */ if (strlen(name) > 40) name[40] = '\0'; for (p = name; *p != '\0'; p++) { if (!isascii(*p)) *p &= 0x7f; else if (!isprint(*p)) *p = '.'; } if (HomeMailFile == NULL) { if (sm_snprintf(path, sizeof(path), "%s/%s", _PATH_MAILDIR, name) >= sizeof(path)) { exitval = EX_UNAVAILABLE; mailerr("550 5.1.1", "%s: Invalid mailbox path", name); return; } } else if (*user.mbdb_homedir == '\0') { exitval = EX_UNAVAILABLE; mailerr("550 5.1.1", "%s: User missing home directory", name); return; } else if (sm_snprintf(path, sizeof(path), "%s/%s", user.mbdb_homedir, HomeMailFile) >= sizeof(path)) { exitval = EX_UNAVAILABLE; mailerr("550 5.1.1", "%s: Invalid mailbox path", name); return; } /* ** If the mailbox is linked or a symlink, fail. There's an obvious ** race here, that the file was replaced with a symbolic link after ** the lstat returned, but before the open. We attempt to detect ** this by comparing the original stat information and information ** returned by an fstat of the file descriptor returned by the open. ** ** NB: this is a symptom of a larger problem, that the mail spooling ** directory is writeable by the wrong users. If that directory is ** writeable, system security is compromised for other reasons, and ** it cannot be fixed here. ** ** If we created the mailbox, set the owner/group. If that fails, ** just return. Another process may have already opened it, so we ** can't unlink it. Historically, binmail set the owner/group at ** each mail delivery. We no longer do this, assuming that if the ** ownership or permissions were changed there was a reason. ** ** XXX ** open(2) should support flock'ing the file. */ tryagain: #ifdef MAILLOCK p = name; #else /* MAILLOCK */ p = path; #endif /* MAILLOCK */ if ((off = lockmbox(p)) != 0) { if (off == EX_TEMPFAIL || e_to_sys(off) == EX_TEMPFAIL) { ExitVal = EX_TEMPFAIL; errcode = "451 4.3.0"; } else errcode = "551 5.3.0"; mailerr(errcode, "lockmailbox %s failed; error code %d %s", p, off, errno > 0 ? sm_errstring(errno) : ""); return; } if (lstat(path, &sb) < 0) { int save_errno; int mode = S_IRUSR|S_IWUSR; gid_t gid = user.mbdb_gid; #ifdef MAILGID (void) umask(0007); gid = MAILGID; mode |= S_IRGRP|S_IWGRP; #endif /* MAILGID */ mbfd = open(path, O_APPEND|O_CREAT|O_EXCL|O_WRONLY|EXTRA_MODE, mode); save_errno = errno; if (lstat(path, &sb) < 0) { ExitVal = EX_CANTCREAT; mailerr("550 5.2.0", "%s: lstat: file changed after open", path); goto err1; } if (mbfd < 0) { if (save_errno == EEXIST) goto tryagain; /* open failed, don't try again */ mailerr("450 4.2.0", "%s: %s", path, sm_errstring(save_errno)); goto err0; } else if (fchown(mbfd, user.mbdb_uid, gid) < 0) { mailerr("451 4.3.0", "chown %u.%u: %s", user.mbdb_uid, gid, name); goto err1; } else { /* ** open() was successful, now close it so can ** be opened as the right owner again. ** Paranoia: reset mbdf since the file descriptor ** is no longer valid; better safe than sorry. */ sb.st_uid = user.mbdb_uid; (void) close(mbfd); mbfd = -1; } } else if (sb.st_nlink != 1 || !S_ISREG(sb.st_mode)) { mailerr("550 5.2.0", "%s: irregular file", path); goto err0; } else if (sb.st_uid != user.mbdb_uid) { ExitVal = EX_CANTCREAT; mailerr("550 5.2.0", "%s: wrong ownership (%d)", path, (int) sb.st_uid); goto err0; } /* change UID for quota checks */ if (setreuid(0, user.mbdb_uid) < 0) { mailerr("450 4.2.0", "setreuid(0, %d): %s (r=%d, e=%d)", (int) user.mbdb_uid, sm_errstring(errno), (int) getuid(), (int) geteuid()); goto err1; } #ifdef DEBUG fprintf(stderr, "new euid = %d\n", (int) geteuid()); #endif /* DEBUG */ mbfd = open(path, O_APPEND|O_WRONLY|EXTRA_MODE, 0); if (mbfd < 0) { mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno)); goto err0; } else if (fstat(mbfd, &fsb) < 0 || fsb.st_nlink != 1 || sb.st_nlink != 1 || !S_ISREG(fsb.st_mode) || sb.st_dev != fsb.st_dev || sb.st_ino != fsb.st_ino || # if HAS_ST_GEN && 0 /* AFS returns random values for st_gen */ sb.st_gen != fsb.st_gen || # endif /* HAS_ST_GEN && 0 */ sb.st_uid != fsb.st_uid) { ExitVal = EX_TEMPFAIL; mailerr("550 5.2.0", "%s: fstat: file changed after open", path); goto err1; } #if 0 /* ** This code could be reused if we decide to add a ** per-user quota field to the sm_mbdb interface. */ /* ** Fail if the user has a quota specified, and delivery of this ** message would exceed that quota. We bounce such failures using ** EX_UNAVAILABLE, unless there were internal problems, since ** storing immense messages for later retries can cause queueing ** issues. */ if (ui.quota > 0) { struct stat dsb; if (fstat(fd, &dsb) < 0) { ExitVal = EX_TEMPFAIL; mailerr("451 4.3.0", "%s: fstat: can't stat temporary storage: %s", ui.mailspool, sm_errstring(errno)); goto err1; } if (dsb.st_size + sb.st_size + 1 > ui.quota) { ExitVal = EX_UNAVAILABLE; mailerr("551 5.2.2", "%s: Mailbox full or quota exceeded", ui.mailspool); goto err1; } } #endif /* 0 */ /* Wait until we can get a lock on the file. */ if (flock(mbfd, LOCK_EX) < 0) { mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno)); goto err1; } /* Get the starting offset of the new message for biff. */ curoff = lseek(mbfd, (off_t) 0, SEEK_END); if (!nobiff) { (void) sm_snprintf(biffmsg, sizeof(biffmsg), "%s@%lld\n", name, (LONGLONG_T) curoff); } /* Copy the message into the file. */ if (lseek(fd, (off_t) 0, SEEK_SET) == (off_t) -1) { mailerr("450 4.2.0", "Temporary file: %s", sm_errstring(errno)); goto err1; } #ifdef DEBUG fprintf(stderr, "before writing: euid = %d\n", (int) geteuid()); #endif /* DEBUG */ #ifdef CONTENTLENGTH headerbytes = (BodyLength >= 0) ? HeaderLength : -1 ; for (;;) { if (headerbytes == 0) { (void) sm_snprintf(buf, sizeof buf, "%s", ContentHdr); nr = strlen(buf); headerbytes = -1; readamount = 0; } else if (headerbytes > sizeof(buf) || headerbytes < 0) readamount = sizeof(buf); else readamount = headerbytes; if (readamount != 0) nr = read(fd, buf, readamount); if (nr <= 0) break; if (headerbytes > 0) headerbytes -= nr ; #else /* CONTENTLENGTH */ while ((nr = read(fd, buf, sizeof(buf))) > 0) { #endif /* CONTENTLENGTH */ for (off = 0; off < nr; off += nw) { if ((nw = write(mbfd, buf + off, nr - off)) < 0) { errcode = "450 4.2.0"; #ifdef EDQUOT if (errno == EDQUOT && BounceQuota) errcode = "552 5.2.2"; #endif /* EDQUOT */ mailerr(errcode, "%s: %s", path, sm_errstring(errno)); goto err3; } } } if (nr < 0) { mailerr("450 4.2.0", "Temporary file: %s", sm_errstring(errno)); goto err3; } /* Flush to disk, don't wait for update. */ if (!nofsync && fsync(mbfd) < 0) { mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno)); err3: (void) setreuid(0, 0); #ifdef DEBUG fprintf(stderr, "reset euid = %d\n", (int) geteuid()); #endif /* DEBUG */ if (mbfd >= 0) (void) ftruncate(mbfd, curoff); err1: if (mbfd >= 0) (void) close(mbfd); err0: unlockmbox(); return; } /* Close and check -- NFS doesn't write until the close. */ if (close(mbfd)) { errcode = "450 4.2.0"; #ifdef EDQUOT if (errno == EDQUOT && BounceQuota) errcode = "552 5.2.2"; #endif /* EDQUOT */ mailerr(errcode, "%s: %s", path, sm_errstring(errno)); mbfd = open(path, O_WRONLY|EXTRA_MODE, 0); if (mbfd < 0 || fstat(mbfd, &sb) < 0 || sb.st_nlink != 1 || !S_ISREG(sb.st_mode) || sb.st_dev != fsb.st_dev || sb.st_ino != fsb.st_ino || # if HAS_ST_GEN && 0 /* AFS returns random values for st_gen */ sb.st_gen != fsb.st_gen || # endif /* HAS_ST_GEN && 0 */ sb.st_uid != fsb.st_uid ) { /* Don't use a bogus file */ if (mbfd >= 0) { (void) close(mbfd); mbfd = -1; } } /* Attempt to truncate back to pre-write size */ goto err3; } else if (!nobiff) notifybiff(biffmsg); if (setreuid(0, 0) < 0) { mailerr("450 4.2.0", "setreuid(0, 0): %s", sm_errstring(errno)); goto err0; } #ifdef DEBUG fprintf(stderr, "reset euid = %d\n", (int) geteuid()); #endif /* DEBUG */ unlockmbox(); if (LMTPMode) printf("250 2.1.5 %s Ok\r\n", name); } /* ** user.lock files are necessary for compatibility with other ** systems, e.g., when the mail spool file is NFS exported. ** Alas, mailbox locking is more than just a local matter. ** EPA 11/94. */ bool Locked = false; #ifdef MAILLOCK int lockmbox(name) char *name; { int r = 0; if (Locked) return 0; if ((r = maillock(name, 15)) == L_SUCCESS) { Locked = true; return 0; } switch (r) { case L_TMPLOCK: /* Can't create tmp file */ case L_TMPWRITE: /* Can't write pid into lockfile */ case L_MAXTRYS: /* Failed after retrycnt attempts */ errno = 0; r = EX_TEMPFAIL; break; case L_ERROR: /* Check errno for reason */ r = errno; break; default: /* other permanent errors */ errno = 0; r = EX_UNAVAILABLE; break; } return r; } void unlockmbox() { if (Locked) mailunlock(); Locked = false; } #else /* MAILLOCK */ char LockName[MAXPATHLEN]; int lockmbox(path) char *path; { int statfailed = 0; time_t start; if (Locked) return 0; if (strlen(path) + 6 > sizeof LockName) return EX_SOFTWARE; (void) sm_snprintf(LockName, sizeof LockName, "%s.lock", path); (void) time(&start); for (; ; sleep(5)) { int fd; struct stat st; time_t now; /* global timeout */ (void) time(&now); if (now > start + LOCKTO_GLOB) { errno = 0; return EX_TEMPFAIL; } fd = open(LockName, O_WRONLY|O_EXCL|O_CREAT, 0); if (fd >= 0) { /* defeat lock checking programs which test pid */ (void) write(fd, "0", 2); Locked = true; (void) close(fd); return 0; } if (stat(LockName, &st) < 0) { if (statfailed++ > 5) { errno = 0; return EX_TEMPFAIL; } continue; } statfailed = 0; (void) time(&now); if (now < st.st_ctime + LOCKTO_RM) continue; /* try to remove stale lockfile */ if (unlink(LockName) < 0) return errno; } } void unlockmbox() { if (!Locked) return; (void) unlink(LockName); Locked = false; } #endif /* MAILLOCK */ void notifybiff(msg) char *msg; { static bool initialized = false; static int f = -1; struct hostent *hp; struct servent *sp; int len; static struct sockaddr_in addr; if (!initialized) { initialized = true; /* Be silent if biff service not available. */ if ((sp = getservbyname("biff", "udp")) == NULL || (hp = gethostbyname("localhost")) == NULL || hp->h_length != INADDRSZ) return; addr.sin_family = hp->h_addrtype; memcpy(&addr.sin_addr, hp->h_addr, INADDRSZ); addr.sin_port = sp->s_port; } /* No message, just return */ if (msg == NULL) return; /* Couldn't initialize addr struct */ if (addr.sin_family == AF_UNSPEC) return; if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) < 0) return; len = strlen(msg) + 1; (void) sendto(f, msg, len, 0, (struct sockaddr *) &addr, sizeof(addr)); } void usage() { ExitVal = EX_USAGE; mailerr(NULL, "usage: mail.local [-7] [-B] [-b] [-d] [-l] [-s] [-f from|-r from] [-h filename] user ..."); exit(ExitVal); } void /*VARARGS2*/ #ifdef __STDC__ mailerr(const char *hdr, const char *fmt, ...) #else /* __STDC__ */ mailerr(hdr, fmt, va_alist) const char *hdr; const char *fmt; va_dcl #endif /* __STDC__ */ { size_t len = 0; SM_VA_LOCAL_DECL (void) e_to_sys(errno); SM_VA_START(ap, fmt); if (LMTPMode && hdr != NULL) { sm_snprintf(ErrBuf, sizeof ErrBuf, "%s ", hdr); len = strlen(ErrBuf); } (void) sm_vsnprintf(&ErrBuf[len], sizeof ErrBuf - len, fmt, ap); SM_VA_END(ap); if (!HoldErrs) flush_error(); /* Log the message to syslog. */ if (!LMTPMode) syslog(LOG_ERR, "%s", ErrBuf); } void flush_error() { if (LMTPMode) printf("%s\r\n", ErrBuf); else { if (ExitVal != EX_USAGE) (void) fprintf(stderr, "mail.local: "); fprintf(stderr, "%s\n", ErrBuf); } } /* * e_to_sys -- * Guess which errno's are temporary. Gag me. */ int e_to_sys(num) int num; { /* Temporary failures override hard errors. */ if (ExitVal == EX_TEMPFAIL) return ExitVal; switch (num) /* Hopefully temporary errors. */ { #ifdef EDQUOT case EDQUOT: /* Disc quota exceeded */ if (BounceQuota) { ExitVal = EX_UNAVAILABLE; break; } /* FALLTHROUGH */ #endif /* EDQUOT */ #ifdef EAGAIN case EAGAIN: /* Resource temporarily unavailable */ #endif /* EAGAIN */ #ifdef EBUSY case EBUSY: /* Device busy */ #endif /* EBUSY */ #ifdef EPROCLIM case EPROCLIM: /* Too many processes */ #endif /* EPROCLIM */ #ifdef EUSERS case EUSERS: /* Too many users */ #endif /* EUSERS */ #ifdef ECONNABORTED case ECONNABORTED: /* Software caused connection abort */ #endif /* ECONNABORTED */ #ifdef ECONNREFUSED case ECONNREFUSED: /* Connection refused */ #endif /* ECONNREFUSED */ #ifdef ECONNRESET case ECONNRESET: /* Connection reset by peer */ #endif /* ECONNRESET */ #ifdef EDEADLK case EDEADLK: /* Resource deadlock avoided */ #endif /* EDEADLK */ #ifdef EFBIG case EFBIG: /* File too large */ #endif /* EFBIG */ #ifdef EHOSTDOWN case EHOSTDOWN: /* Host is down */ #endif /* EHOSTDOWN */ #ifdef EHOSTUNREACH case EHOSTUNREACH: /* No route to host */ #endif /* EHOSTUNREACH */ #ifdef EMFILE case EMFILE: /* Too many open files */ #endif /* EMFILE */ #ifdef ENETDOWN case ENETDOWN: /* Network is down */ #endif /* ENETDOWN */ #ifdef ENETRESET case ENETRESET: /* Network dropped connection on reset */ #endif /* ENETRESET */ #ifdef ENETUNREACH case ENETUNREACH: /* Network is unreachable */ #endif /* ENETUNREACH */ #ifdef ENFILE case ENFILE: /* Too many open files in system */ #endif /* ENFILE */ #ifdef ENOBUFS case ENOBUFS: /* No buffer space available */ #endif /* ENOBUFS */ #ifdef ENOMEM case ENOMEM: /* Cannot allocate memory */ #endif /* ENOMEM */ #ifdef ENOSPC case ENOSPC: /* No space left on device */ #endif /* ENOSPC */ #ifdef EROFS case EROFS: /* Read-only file system */ #endif /* EROFS */ #ifdef ESTALE case ESTALE: /* Stale NFS file handle */ #endif /* ESTALE */ #ifdef ETIMEDOUT case ETIMEDOUT: /* Connection timed out */ #endif /* ETIMEDOUT */ #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN && EWOULDBLOCK != EDEADLK case EWOULDBLOCK: /* Operation would block. */ #endif /* defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN && EWOULDBLOCK != EDEADLK */ ExitVal = EX_TEMPFAIL; break; default: ExitVal = EX_UNAVAILABLE; break; } return ExitVal; } #if defined(ultrix) || defined(_CRAY) /* * Copyright (c) 1987, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ # if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; # endif /* defined(LIBC_SCCS) && !defined(lint) */ # include # include # include # include # include # include static int _gettemp(); mkstemp(path) char *path; { int fd; return (_gettemp(path, &fd) ? fd : -1); } static _gettemp(path, doopen) char *path; register int *doopen; { extern int errno; register char *start, *trv; struct stat sbuf; unsigned int pid; pid = getpid(); for (trv = path; *trv; ++trv); /* extra X's get set to 0's */ while (*--trv == 'X') { *trv = (pid % 10) + '0'; pid /= 10; } /* * check the target directory; if you have six X's and it * doesn't exist this runs for a *very* long time. */ for (start = trv + 1;; --trv) { if (trv <= path) break; if (*trv == '/') { *trv = '\0'; if (stat(path, &sbuf) < 0) return(0); if (!S_ISDIR(sbuf.st_mode)) { errno = ENOTDIR; return(0); } *trv = '/'; break; } } for (;;) { if (doopen) { if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) return(1); if (errno != EEXIST) return(0); } else if (stat(path, &sbuf) < 0) return(errno == ENOENT ? 1 : 0); /* tricky little algorithm for backward compatibility */ for (trv = start;;) { if (!*trv) return(0); if (*trv == 'z') *trv++ = 'a'; else { if (isascii(*trv) && isdigit(*trv)) *trv = 'a'; else ++*trv; break; } } } /* NOTREACHED */ } #endif /* defined(ultrix) || defined(_CRAY) */