diff options
Diffstat (limited to 'src/util/dict_unix.c')
| -rw-r--r-- | src/util/dict_unix.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/util/dict_unix.c b/src/util/dict_unix.c new file mode 100644 index 0000000..4635344 --- /dev/null +++ b/src/util/dict_unix.c @@ -0,0 +1,204 @@ +/*++ +/* NAME +/* dict_unix 3 +/* SUMMARY +/* dictionary manager interface to UNIX tables +/* SYNOPSIS +/* #include <dict_unix.h> +/* +/* DICT *dict_unix_open(map, dummy, dict_flags) +/* const char *map; +/* int dummy; +/* int dict_flags; +/* DESCRIPTION +/* dict_unix_open() makes the specified UNIX table accessible via +/* the generic dictionary operations described in dict_open(3). +/* The \fIdummy\fR argument is not used. +/* +/* Known map names: +/* .IP passwd.byname +/* The table is the UNIX password database. The key is a login name. +/* The result is a password file entry in passwd(5) format. +/* .IP group.byname +/* The table is the UNIX group database. The key is a group name. +/* The result is a group file entry in group(5) format. +/* SEE ALSO +/* dict(3) generic dictionary manager +/* DIAGNOSTICS +/* Fatal errors: out of memory, unknown map name, attempt to update map. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include "sys_defs.h" +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <pwd.h> +#include <grp.h> + +/* Utility library. */ + +#include "msg.h" +#include "mymalloc.h" +#include "vstring.h" +#include "stringops.h" +#include "dict.h" +#include "dict_unix.h" + +/* Application-specific. */ + +typedef struct { + DICT dict; /* generic members */ +} DICT_UNIX; + +/* dict_unix_getpwnam - find password table entry */ + +static const char *dict_unix_getpwnam(DICT *dict, const char *key) +{ + struct passwd *pwd; + static VSTRING *buf; + static int sanity_checked; + + dict->error = 0; + + /* + * Optionally fold the key. + */ + if (dict->flags & DICT_FLAG_FOLD_FIX) { + if (dict->fold_buf == 0) + dict->fold_buf = vstring_alloc(10); + vstring_strcpy(dict->fold_buf, key); + key = lowercase(vstring_str(dict->fold_buf)); + } + if ((pwd = getpwnam(key)) == 0) { + if (sanity_checked == 0) { + sanity_checked = 1; + errno = 0; + if (getpwuid(0) == 0) { + msg_warn("cannot access UNIX password database: %m"); + dict->error = DICT_ERR_RETRY; + } + } + return (0); + } else { + if (buf == 0) + buf = vstring_alloc(10); + sanity_checked = 1; + vstring_sprintf(buf, "%s:%s:%ld:%ld:%s:%s:%s", + pwd->pw_name, pwd->pw_passwd, (long) pwd->pw_uid, + (long) pwd->pw_gid, pwd->pw_gecos, pwd->pw_dir, + pwd->pw_shell); + return (vstring_str(buf)); + } +} + +/* dict_unix_getgrnam - find group table entry */ + +static const char *dict_unix_getgrnam(DICT *dict, const char *key) +{ + struct group *grp; + static VSTRING *buf; + char **cpp; + static int sanity_checked; + + dict->error = 0; + + /* + * Optionally fold the key. + */ + if (dict->flags & DICT_FLAG_FOLD_FIX) { + if (dict->fold_buf == 0) + dict->fold_buf = vstring_alloc(10); + vstring_strcpy(dict->fold_buf, key); + key = lowercase(vstring_str(dict->fold_buf)); + } + if ((grp = getgrnam(key)) == 0) { + if (sanity_checked == 0) { + sanity_checked = 1; + errno = 0; + if (getgrgid(0) == 0) { + msg_warn("cannot access UNIX group database: %m"); + dict->error = DICT_ERR_RETRY; + } + } + return (0); + } else { + if (buf == 0) + buf = vstring_alloc(10); + sanity_checked = 1; + vstring_sprintf(buf, "%s:%s:%ld:", + grp->gr_name, grp->gr_passwd, (long) grp->gr_gid); + for (cpp = grp->gr_mem; *cpp; cpp++) { + vstring_strcat(buf, *cpp); + if (cpp[1]) + VSTRING_ADDCH(buf, ','); + } + VSTRING_TERMINATE(buf); + return (vstring_str(buf)); + } +} + +/* dict_unix_close - close UNIX map */ + +static void dict_unix_close(DICT *dict) +{ + if (dict->fold_buf) + vstring_free(dict->fold_buf); + dict_free(dict); +} + +/* dict_unix_open - open UNIX map */ + +DICT *dict_unix_open(const char *map, int open_flags, int dict_flags) +{ + DICT_UNIX *dict_unix; + struct dict_unix_lookup { + char *name; + const char *(*lookup) (DICT *, const char *); + }; + static struct dict_unix_lookup dict_unix_lookup[] = { + "passwd.byname", dict_unix_getpwnam, + "group.byname", dict_unix_getgrnam, + 0, + }; + struct dict_unix_lookup *lp; + + /* + * Sanity checks. + */ + if (open_flags != O_RDONLY) + return (dict_surrogate(DICT_TYPE_UNIX, map, open_flags, dict_flags, + "%s:%s map requires O_RDONLY access mode", + DICT_TYPE_UNIX, map)); + + /* + * "Open" the database. + */ + for (lp = dict_unix_lookup; /* void */ ; lp++) { + if (lp->name == 0) + return (dict_surrogate(DICT_TYPE_UNIX, map, open_flags, dict_flags, + "unknown table: %s:%s", DICT_TYPE_UNIX, map)); + if (strcmp(map, lp->name) == 0) + break; + } + dict_unix = (DICT_UNIX *) dict_alloc(DICT_TYPE_UNIX, map, + sizeof(*dict_unix)); + dict_unix->dict.lookup = lp->lookup; + dict_unix->dict.close = dict_unix_close; + dict_unix->dict.flags = dict_flags | DICT_FLAG_FIXED; + if (dict_flags & DICT_FLAG_FOLD_FIX) + dict_unix->dict.fold_buf = vstring_alloc(10); + dict_unix->dict.owner.status = DICT_OWNER_TRUSTED; + + return (DICT_DEBUG (&dict_unix->dict)); +} |