Rework source layout in preparation for modular sudo.
This commit is contained in:
Todd C. Miller
607
plugins/sudoers/pwutil.c
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607
plugins/sudoers/pwutil.c
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@@ -0,0 +1,607 @@
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/*
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* Copyright (c) 1996, 1998-2005, 2007-2009
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* Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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# include <memory.h>
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# endif
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <pwd.h>
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#include <grp.h>
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#include "sudo.h"
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#include "redblack.h"
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/*
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* The passwd and group caches.
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*/
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static struct rbtree *pwcache_byuid, *pwcache_byname;
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static struct rbtree *grcache_bygid, *grcache_byname;
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static int cmp_pwuid __P((const void *, const void *));
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static int cmp_pwnam __P((const void *, const void *));
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static int cmp_grgid __P((const void *, const void *));
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static int cmp_grnam __P((const void *, const void *));
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/*
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* Compare by uid.
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*/
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static int
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cmp_pwuid(v1, v2)
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const void *v1;
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const void *v2;
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{
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const struct passwd *pw1 = (const struct passwd *) v1;
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const struct passwd *pw2 = (const struct passwd *) v2;
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return(pw1->pw_uid - pw2->pw_uid);
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}
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/*
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* Compare by user name.
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*/
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static int
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cmp_pwnam(v1, v2)
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const void *v1;
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const void *v2;
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{
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const struct passwd *pw1 = (const struct passwd *) v1;
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const struct passwd *pw2 = (const struct passwd *) v2;
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return(strcmp(pw1->pw_name, pw2->pw_name));
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}
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#define FIELD_SIZE(src, name, size) \
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do { \
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if (src->name) { \
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size = strlen(src->name) + 1; \
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total += size; \
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} \
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} while (0)
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#define FIELD_COPY(src, dst, name, size) \
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do { \
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if (src->name) { \
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memcpy(cp, src->name, size); \
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dst->name = cp; \
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cp += size; \
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} \
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} while (0)
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/*
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* Dynamically allocate space for a struct password and the constituent parts
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* that we care about. Fills in pw_passwd from shadow file.
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*/
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static struct passwd *
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sudo_pwdup(pw)
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const struct passwd *pw;
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{
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char *cp;
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const char *pw_shell;
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size_t nsize, psize, csize, gsize, dsize, ssize, total;
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struct passwd *newpw;
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/* If shell field is empty, expand to _PATH_BSHELL. */
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pw_shell = (pw->pw_shell == NULL || pw->pw_shell[0] == '\0')
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? _PATH_BSHELL : pw->pw_shell;
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/* Allocate in one big chunk for easy freeing. */
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nsize = psize = csize = gsize = dsize = ssize = 0;
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total = sizeof(struct passwd);
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FIELD_SIZE(pw, pw_name, nsize);
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FIELD_SIZE(pw, pw_passwd, psize);
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#ifdef HAVE_LOGIN_CAP_H
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FIELD_SIZE(pw, pw_class, csize);
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#endif
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FIELD_SIZE(pw, pw_gecos, gsize);
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FIELD_SIZE(pw, pw_dir, dsize);
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FIELD_SIZE(pw, pw_shell, ssize);
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if ((cp = malloc(total)) == NULL)
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return(NULL);
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newpw = (struct passwd *) cp;
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/*
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* Copy in passwd contents and make strings relative to space
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* at the end of the buffer.
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*/
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memcpy(newpw, pw, sizeof(struct passwd));
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cp += sizeof(struct passwd);
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FIELD_COPY(pw, newpw, pw_name, nsize);
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FIELD_COPY(pw, newpw, pw_passwd, psize);
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#ifdef HAVE_LOGIN_CAP_H
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FIELD_COPY(pw, newpw, pw_class, csize);
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#endif
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FIELD_COPY(pw, newpw, pw_gecos, gsize);
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FIELD_COPY(pw, newpw, pw_dir, dsize);
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FIELD_COPY(pw, newpw, pw_shell, ssize);
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return(newpw);
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}
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/*
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* Get a password entry by uid and allocate space for it.
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* Fills in pw_passwd from shadow file if necessary.
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*/
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struct passwd *
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sudo_getpwuid(uid)
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uid_t uid;
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{
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struct passwd key, *pw;
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struct rbnode *node;
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char *cp;
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key.pw_uid = uid;
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if ((node = rbfind(pwcache_byuid, &key)) != NULL) {
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pw = (struct passwd *) node->data;
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return(pw->pw_name != NULL ? pw : NULL);
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}
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/*
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* Cache passwd db entry if it exists or a negative response if not.
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*/
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if ((pw = getpwuid(uid)) != NULL) {
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pw = sudo_pwdup(pw);
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cp = sudo_getepw(pw); /* get shadow password */
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if (pw->pw_passwd != NULL)
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zero_bytes(pw->pw_passwd, strlen(pw->pw_passwd));
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pw->pw_passwd = cp;
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if (rbinsert(pwcache_byuid, (void *) pw) != NULL)
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errorx(1, "unable to cache uid %lu (%s), already exists",
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uid, pw->pw_name);
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return(pw);
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} else {
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pw = emalloc(sizeof(*pw));
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zero_bytes(pw, sizeof(*pw));
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pw->pw_uid = uid;
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if (rbinsert(pwcache_byuid, (void *) pw) != NULL)
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errorx(1, "unable to cache uid %lu, already exists", uid);
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return(NULL);
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}
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}
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/*
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* Get a password entry by name and allocate space for it.
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* Fills in pw_passwd from shadow file if necessary.
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*/
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struct passwd *
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sudo_getpwnam(name)
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const char *name;
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{
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struct passwd key, *pw;
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struct rbnode *node;
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size_t len;
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char *cp;
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key.pw_name = (char *) name;
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if ((node = rbfind(pwcache_byname, &key)) != NULL) {
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pw = (struct passwd *) node->data;
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return(pw->pw_uid != (uid_t) -1 ? pw : NULL);
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}
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/*
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* Cache passwd db entry if it exists or a negative response if not.
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*/
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if ((pw = getpwnam(name)) != NULL) {
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pw = sudo_pwdup(pw);
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cp = sudo_getepw(pw); /* get shadow password */
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if (pw->pw_passwd != NULL)
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zero_bytes(pw->pw_passwd, strlen(pw->pw_passwd));
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pw->pw_passwd = cp;
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if (rbinsert(pwcache_byname, (void *) pw) != NULL)
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errorx(1, "unable to cache user %s, already exists", name);
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return(pw);
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} else {
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len = strlen(name) + 1;
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cp = emalloc(sizeof(*pw) + len);
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zero_bytes(cp, sizeof(*pw));
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pw = (struct passwd *) cp;
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cp += sizeof(*pw);
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memcpy(cp, name, len);
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pw->pw_name = cp;
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pw->pw_uid = (uid_t) -1;
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if (rbinsert(pwcache_byname, (void *) pw) != NULL)
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errorx(1, "unable to cache user %s, already exists", name);
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return(NULL);
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}
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}
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/*
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* Take a uid in string form "#123" and return a faked up passwd struct.
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*/
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struct passwd *
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sudo_fakepwnam(user, gid)
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const char *user;
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gid_t gid;
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{
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struct passwd *pw;
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struct rbnode *node;
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size_t len;
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len = strlen(user);
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pw = emalloc(sizeof(struct passwd) + len + 1 /* pw_name */ +
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sizeof("*") /* pw_passwd */ + sizeof("") /* pw_gecos */ +
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sizeof("/") /* pw_dir */ + sizeof(_PATH_BSHELL));
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zero_bytes(pw, sizeof(struct passwd));
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pw->pw_uid = (uid_t) atoi(user + 1);
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pw->pw_gid = gid;
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pw->pw_name = (char *)pw + sizeof(struct passwd);
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memcpy(pw->pw_name, user, len + 1);
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pw->pw_passwd = pw->pw_name + len + 1;
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memcpy(pw->pw_passwd, "*", 2);
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pw->pw_gecos = pw->pw_passwd + 2;
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pw->pw_gecos[0] = '\0';
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pw->pw_dir = pw->pw_gecos + 1;
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memcpy(pw->pw_dir, "/", 2);
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pw->pw_shell = pw->pw_dir + 2;
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memcpy(pw->pw_shell, _PATH_BSHELL, sizeof(_PATH_BSHELL));
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/* Store by uid and by name, overwriting cached version. */
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if ((node = rbinsert(pwcache_byuid, pw)) != NULL) {
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efree(node->data);
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node->data = (void *) pw;
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}
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if ((node = rbinsert(pwcache_byname, pw)) != NULL) {
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efree(node->data);
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node->data = (void *) pw;
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}
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return(pw);
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}
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/*
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* Take a gid in string form "#123" and return a faked up group struct.
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*/
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struct group *
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sudo_fakegrnam(group)
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const char *group;
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{
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struct group *gr;
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struct rbnode *node;
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size_t len;
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len = strlen(group);
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gr = emalloc(sizeof(struct group) + len + 1);
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zero_bytes(gr, sizeof(struct group));
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gr->gr_gid = (gid_t) atoi(group + 1);
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gr->gr_name = (char *)gr + sizeof(struct group);
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strlcpy(gr->gr_name, group, len + 1);
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/* Store by gid and by name, overwriting cached version. */
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if ((node = rbinsert(grcache_bygid, gr)) != NULL) {
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efree(node->data);
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node->data = (void *) gr;
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}
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if ((node = rbinsert(grcache_byname, gr)) != NULL) {
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efree(node->data);
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node->data = (void *) gr;
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}
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return(gr);
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}
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void
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sudo_setpwent()
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{
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setpwent();
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sudo_setspent();
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if (pwcache_byuid == NULL)
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pwcache_byuid = rbcreate(cmp_pwuid);
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if (pwcache_byname == NULL)
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pwcache_byname = rbcreate(cmp_pwnam);
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}
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#ifdef PURIFY
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static void pw_free __P((void *));
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void
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sudo_freepwcache()
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{
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if (pwcache_byuid != NULL) {
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rbdestroy(pwcache_byuid, pw_free);
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pwcache_byuid = NULL;
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}
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if (pwcache_byname != NULL) {
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rbdestroy(pwcache_byname, NULL);
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pwcache_byname = NULL;
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}
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}
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static void
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pw_free(v)
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void *v;
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{
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struct passwd *pw = (struct passwd *) v;
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if (pw->pw_passwd != NULL) {
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zero_bytes(pw->pw_passwd, strlen(pw->pw_passwd));
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efree(pw->pw_passwd);
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}
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efree(pw);
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}
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#endif /* PURIFY */
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void
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sudo_endpwent()
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{
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endpwent();
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sudo_endspent();
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#ifdef PURIFY
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sudo_freepwcache();
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#endif
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}
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/*
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* Compare by gid.
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*/
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static int
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cmp_grgid(v1, v2)
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const void *v1;
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const void *v2;
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{
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const struct group *grp1 = (const struct group *) v1;
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const struct group *grp2 = (const struct group *) v2;
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return(grp1->gr_gid - grp2->gr_gid);
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}
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/*
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* Compare by group name.
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*/
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static int
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cmp_grnam(v1, v2)
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const void *v1;
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const void *v2;
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{
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const struct group *grp1 = (const struct group *) v1;
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const struct group *grp2 = (const struct group *) v2;
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return(strcmp(grp1->gr_name, grp2->gr_name));
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}
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struct group *
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sudo_grdup(gr)
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const struct group *gr;
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{
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char *cp;
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size_t nsize, psize, nmem, total, len;
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struct group *newgr;
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/* Allocate in one big chunk for easy freeing. */
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nsize = psize = nmem = 0;
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total = sizeof(struct group);
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FIELD_SIZE(gr, gr_name, nsize);
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FIELD_SIZE(gr, gr_passwd, psize);
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if (gr->gr_mem) {
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for (nmem = 0; gr->gr_mem[nmem] != NULL; nmem++)
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total += strlen(gr->gr_mem[nmem]) + 1;
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nmem++;
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total += sizeof(char *) * nmem;
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}
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if ((cp = malloc(total)) == NULL)
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return(NULL);
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newgr = (struct group *)cp;
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/*
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* Copy in group contents and make strings relative to space
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* at the end of the buffer. Note that gr_mem must come
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* immediately after struct group to guarantee proper alignment.
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*/
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(void)memcpy(newgr, gr, sizeof(struct group));
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cp += sizeof(struct group);
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if (gr->gr_mem) {
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newgr->gr_mem = (char **)cp;
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cp += sizeof(char *) * nmem;
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for (nmem = 0; gr->gr_mem[nmem] != NULL; nmem++) {
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len = strlen(gr->gr_mem[nmem]) + 1;
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memcpy(cp, gr->gr_mem[nmem], len);
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newgr->gr_mem[nmem] = cp;
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cp += len;
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}
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newgr->gr_mem[nmem] = NULL;
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}
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FIELD_COPY(gr, newgr, gr_passwd, psize);
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FIELD_COPY(gr, newgr, gr_name, nsize);
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return(newgr);
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}
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/*
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* Get a group entry by gid and allocate space for it.
|
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*/
|
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struct group *
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sudo_getgrgid(gid)
|
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gid_t gid;
|
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{
|
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struct group key, *gr;
|
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struct rbnode *node;
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key.gr_gid = gid;
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if ((node = rbfind(grcache_bygid, &key)) != NULL) {
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gr = (struct group *) node->data;
|
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return(gr->gr_name != NULL ? gr : NULL);
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}
|
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/*
|
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* Cache group db entry if it exists or a negative response if not.
|
||||
*/
|
||||
if ((gr = getgrgid(gid)) != NULL) {
|
||||
gr = sudo_grdup(gr);
|
||||
if (rbinsert(grcache_bygid, (void *) gr) != NULL)
|
||||
errorx(1, "unable to cache gid %lu (%s), already exists",
|
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gid, gr->gr_name);
|
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return(gr);
|
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} else {
|
||||
gr = emalloc(sizeof(*gr));
|
||||
zero_bytes(gr, sizeof(*gr));
|
||||
gr->gr_gid = gid;
|
||||
if (rbinsert(grcache_bygid, (void *) gr) != NULL)
|
||||
errorx(1, "unable to cache gid %lu, already exists, gid");
|
||||
return(NULL);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Get a group entry by name and allocate space for it.
|
||||
*/
|
||||
struct group *
|
||||
sudo_getgrnam(name)
|
||||
const char *name;
|
||||
{
|
||||
struct group key, *gr;
|
||||
struct rbnode *node;
|
||||
size_t len;
|
||||
char *cp;
|
||||
|
||||
key.gr_name = (char *) name;
|
||||
if ((node = rbfind(grcache_byname, &key)) != NULL) {
|
||||
gr = (struct group *) node->data;
|
||||
return(gr->gr_gid != (gid_t) -1 ? gr : NULL);
|
||||
}
|
||||
/*
|
||||
* Cache group db entry if it exists or a negative response if not.
|
||||
*/
|
||||
if ((gr = getgrnam(name)) != NULL) {
|
||||
gr = sudo_grdup(gr);
|
||||
if (rbinsert(grcache_byname, (void *) gr) != NULL)
|
||||
errorx(1, "unable to cache group %s, already exists", name);
|
||||
return(gr);
|
||||
} else {
|
||||
len = strlen(name) + 1;
|
||||
cp = emalloc(sizeof(*gr) + len);
|
||||
zero_bytes(cp, sizeof(*gr));
|
||||
gr = (struct group *) cp;
|
||||
cp += sizeof(*gr);
|
||||
memcpy(cp, name, len);
|
||||
gr->gr_name = cp;
|
||||
gr->gr_gid = (gid_t) -1;
|
||||
if (rbinsert(grcache_byname, (void *) gr) != NULL)
|
||||
errorx(1, "unable to cache group %s, already exists", name);
|
||||
return(NULL);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
sudo_setgrent()
|
||||
{
|
||||
setgrent();
|
||||
if (grcache_bygid == NULL)
|
||||
grcache_bygid = rbcreate(cmp_grgid);
|
||||
if (grcache_byname == NULL)
|
||||
grcache_byname = rbcreate(cmp_grnam);
|
||||
}
|
||||
|
||||
#ifdef PURIFY
|
||||
void
|
||||
sudo_freegrcache()
|
||||
{
|
||||
if (grcache_bygid != NULL) {
|
||||
rbdestroy(grcache_bygid, free);
|
||||
grcache_bygid = NULL;
|
||||
}
|
||||
if (grcache_byname != NULL) {
|
||||
rbdestroy(grcache_byname, NULL);
|
||||
grcache_byname = NULL;
|
||||
}
|
||||
}
|
||||
#endif /* PURIFY */
|
||||
|
||||
void
|
||||
sudo_endgrent()
|
||||
{
|
||||
endgrent();
|
||||
#ifdef PURIFY
|
||||
sudo_freegrcache();
|
||||
#endif
|
||||
}
|
||||
|
||||
int
|
||||
user_in_group(pw, group)
|
||||
struct passwd *pw;
|
||||
const char *group;
|
||||
{
|
||||
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
|
||||
uuid_t gu, uu;
|
||||
int ismember;
|
||||
#else
|
||||
char **gr_mem;
|
||||
int i;
|
||||
#endif
|
||||
struct group *grp;
|
||||
|
||||
if ((grp = sudo_getgrnam(group)) == NULL)
|
||||
return(FALSE);
|
||||
|
||||
/* check against user's primary (passwd file) gid */
|
||||
if (grp->gr_gid == pw->pw_gid)
|
||||
return(TRUE);
|
||||
|
||||
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
|
||||
/* If we are matching the invoking user use the stashed uuid. */
|
||||
if (strcmp(pw->pw_name, user_name) == 0) {
|
||||
if (mbr_gid_to_uuid(grp->gr_gid, gu) == 0 &&
|
||||
mbr_check_membership(user_uuid, gu, &ismember) == 0 && ismember)
|
||||
return(TRUE);
|
||||
} else {
|
||||
if (mbr_uid_to_uuid(pw->pw_uid, uu) == 0 &&
|
||||
mbr_gid_to_uuid(grp->gr_gid, gu) == 0 &&
|
||||
mbr_check_membership(uu, gu, &ismember) == 0 && ismember)
|
||||
return(TRUE);
|
||||
}
|
||||
#else /* HAVE_MBR_CHECK_MEMBERSHIP */
|
||||
# ifdef HAVE_GETGROUPS
|
||||
/*
|
||||
* If we are matching the invoking or list user and that user has a
|
||||
* supplementary group vector, check it.
|
||||
*/
|
||||
if (user_ngroups >= 0 &&
|
||||
strcmp(pw->pw_name, list_pw ? list_pw->pw_name : user_name) == 0) {
|
||||
for (i = 0; i < user_ngroups; i++) {
|
||||
if (grp->gr_gid == user_groups[i])
|
||||
return(TRUE);
|
||||
}
|
||||
} else
|
||||
# endif /* HAVE_GETGROUPS */
|
||||
{
|
||||
if (grp != NULL && grp->gr_mem != NULL) {
|
||||
for (gr_mem = grp->gr_mem; *gr_mem; gr_mem++) {
|
||||
if (strcmp(*gr_mem, pw->pw_name) == 0)
|
||||
return(TRUE);
|
||||
}
|
||||
}
|
||||
}
|
||||
#endif /* HAVE_MBR_CHECK_MEMBERSHIP */
|
||||
|
||||
return(FALSE);
|
||||
}
|
||||
Reference in New Issue
Block a user