| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2009 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | #include "exim.h" |
| 9 | |
| 10 | |
| 11 | /************************************************* |
| 12 | * Attempt to create a directory * |
| 13 | *************************************************/ |
| 14 | |
| 15 | /* All the directories that Exim ever creates for itself are within the spool |
| 16 | directory as defined by spool_directory. We are prepared to create as many as |
| 17 | necessary from that directory downwards, inclusive. However, directory creation |
| 18 | can also be required in appendfile and sieve filters. The making function |
| 19 | therefore has a parent argument, below which the new directories are to go. It |
| 20 | can be NULL if the name is absolute. |
| 21 | |
| 22 | If a non-root uid has been specified for exim, and we are currently running as |
| 23 | root, ensure the directory is owned by the non-root id if the parent is the |
| 24 | spool directory. |
| 25 | |
| 26 | Arguments: |
| 27 | parent parent directory name; if NULL the name must be absolute |
| 28 | name directory name within the parent that we want |
| 29 | mode mode for the new directory |
| 30 | panic if TRUE, panic on failure |
| 31 | |
| 32 | Returns: panic on failure if panic is set; otherwise return FALSE; |
| 33 | TRUE on success. |
| 34 | */ |
| 35 | |
| 36 | BOOL |
| 37 | directory_make(const uschar *parent, const uschar *name, |
| 38 | int mode, BOOL panic) |
| 39 | { |
| 40 | BOOL use_chown = parent == spool_directory && geteuid() == root_uid; |
| 41 | uschar *p; |
| 42 | const uschar *slash; |
| 43 | int c = 1; |
| 44 | struct stat statbuf; |
| 45 | uschar buffer[256]; |
| 46 | |
| 47 | if (parent == NULL) |
| 48 | { |
| 49 | p = buffer + 1; |
| 50 | slash = parent = CUS""; |
| 51 | } |
| 52 | else |
| 53 | { |
| 54 | p = buffer + Ustrlen(parent); |
| 55 | slash = US"/"; |
| 56 | } |
| 57 | |
| 58 | if (!string_format(buffer, sizeof(buffer), "%s%s%s", parent, slash, name)) |
| 59 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "name too long in directory_make"); |
| 60 | |
| 61 | while (c != 0 && *p != 0) |
| 62 | { |
| 63 | while (*p != 0 && *p != '/') p++; |
| 64 | c = *p; |
| 65 | *p = 0; |
| 66 | if (Ustat(buffer, &statbuf) != 0) |
| 67 | { |
| 68 | if (mkdir(CS buffer, mode) < 0 && errno != EEXIST) |
| 69 | { |
| 70 | if (!panic) return FALSE; |
| 71 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
| 72 | "Failed to create directory \"%s\": %s\n", buffer, strerror(errno)); |
| 73 | } |
| 74 | |
| 75 | /* Set the ownership if necessary. */ |
| 76 | |
| 77 | if (use_chown && Uchown(buffer, exim_uid, exim_gid)) |
| 78 | { |
| 79 | if (!panic) return FALSE; |
| 80 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
| 81 | "Failed to set owner on directory \"%s\": %s\n", buffer, strerror(errno)); |
| 82 | } |
| 83 | |
| 84 | /* It appears that any mode bits greater than 0777 are ignored by |
| 85 | mkdir(), at least on some operating systems. Therefore, if the mode |
| 86 | contains any such bits, do an explicit mode setting. */ |
| 87 | |
| 88 | if ((mode & 0777000) != 0) (void)Uchmod(buffer, mode); |
| 89 | } |
| 90 | *p++ = c; |
| 91 | } |
| 92 | |
| 93 | return TRUE; |
| 94 | } |
| 95 | |
| 96 | /* End of directory.c */ |