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authorStefan Metzmacher <metze@samba.org>2007-11-05 15:39:46 +0100
committerStefan Metzmacher <metze@samba.org>2007-12-21 05:44:18 +0100
commitb8da353a028b9ce35f1d8caa7f3401563f022ae3 (patch)
treea1fc12b4e49ae2e7cab579fdd9b3837c48087abe /source4/lib
parent557b63be064eb8ba4a584f5260533aa7db19e65d (diff)
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r25835: nss_wrapper: add support for passwd accounts
The NSS_WRAPPER_PASSWD envvar should point to the /etc/passwd style file. metze (This used to be commit c98028458ab451bdde6ec2df6a12babc52ec1625)
Diffstat (limited to 'source4/lib')
-rw-r--r--source4/lib/nss_wrapper/nss_wrapper.c581
1 files changed, 567 insertions, 14 deletions
diff --git a/source4/lib/nss_wrapper/nss_wrapper.c b/source4/lib/nss_wrapper/nss_wrapper.c
index b8c65c405d..b746d3ea61 100644
--- a/source4/lib/nss_wrapper/nss_wrapper.c
+++ b/source4/lib/nss_wrapper/nss_wrapper.c
@@ -83,49 +83,602 @@
#endif
+#if 0
+# ifdef DEBUG
+# define NWRAP_ERROR(args) DEBUG(0, args)
+# else
+# define NWRAP_ERROR(args) printf args
+# endif
+#else
+#define NWRAP_ERROR(args)
+#endif
+
+#if 0
+# ifdef DEBUG
+# define NWRAP_DEBUG(args) DEBUG(0, args)
+# else
+# define NWRAP_DEBUG(args) printf args
+# endif
+#else
+#define NWRAP_DEBUG(args)
+#endif
+
+#if 0
+# ifdef DEBUG
+# define NWRAP_VERBOSE(args) DEBUG(0, args)
+# else
+# define NWRAP_VERBOSE(args) printf args
+# endif
+#else
+#define NWRAP_VERBOSE(args)
+#endif
+
+struct nwrap_cache {
+ const char *path;
+ int fd;
+ struct stat st;
+ uint8_t *buf;
+ void *private_data;
+ bool (*parse_line)(struct nwrap_cache *, char *line);
+ void (*unload)(struct nwrap_cache *);
+};
+
+struct nwrap_pw {
+ struct nwrap_cache *cache;
+
+ struct passwd *list;
+ int num;
+ int idx;
+};
+
+struct nwrap_cache __nwrap_cache_pw;
+struct nwrap_pw nwrap_pw_global;
+
+static bool nwrap_pw_parse_line(struct nwrap_cache *nwrap, char *line);
+static void nwrap_pw_unload(struct nwrap_cache *nwrap);
+
+static void nwrap_init(void)
+{
+ static bool initialized;
+
+ if (initialized) return;
+ initialized = true;
+
+ nwrap_pw_global.cache = &__nwrap_cache_pw;
+
+ nwrap_pw_global.cache->path = getenv("NSS_WRAPPER_PASSWD");
+ nwrap_pw_global.cache->fd = -1;
+ nwrap_pw_global.cache->private_data = &nwrap_pw_global;
+ nwrap_pw_global.cache->parse_line = nwrap_pw_parse_line;
+ nwrap_pw_global.cache->unload = nwrap_pw_unload;
+}
+
+static bool nwrap_enabled(void)
+{
+ nwrap_init();
+
+ if (!nwrap_pw_global.cache->path) {
+ return false;
+ }
+ if (nwrap_pw_global.cache->path[0] == '\0') {
+ return false;
+ }
+
+ return true;
+}
+
+static bool nwrap_parse_file(struct nwrap_cache *nwrap)
+{
+ int ret;
+ uint8_t *buf = NULL;
+ char *nline;
+
+ if (nwrap->st.st_size == 0) {
+ NWRAP_DEBUG(("%s: size == 0\n",
+ __location__));
+ goto done;
+ }
+
+ if (nwrap->st.st_size > INT32_MAX) {
+ NWRAP_ERROR(("%s: size[%u] larger than INT32_MAX\n",
+ __location__, (unsigned)nwrap->st.st_size));
+ goto failed;
+ }
+
+ ret = lseek(nwrap->fd, 0, SEEK_SET);
+ if (ret != 0) {
+ NWRAP_ERROR(("%s: lseek - %d\n",__location__,ret));
+ goto failed;
+ }
+
+ buf = malloc(nwrap->st.st_size + 1);
+ if (!buf) {
+ NWRAP_ERROR(("%s: malloc failed\n",__location__));
+ goto failed;
+ }
+
+ ret = read(nwrap->fd, buf, nwrap->st.st_size);
+ if (ret != nwrap->st.st_size) {
+ NWRAP_ERROR(("%s: read(%u) gave %d\n",
+ __location__, (unsigned)nwrap->st.st_size, ret));
+ goto failed;
+ }
+
+ buf[nwrap->st.st_size] = '\0';
+
+ nline = (char *)buf;
+ while (nline && nline[0]) {
+ char *line;
+ char *e;
+ bool ok;
+
+ line = nline;
+ nline = NULL;
+
+ e = strchr(line, '\n');
+ if (e) {
+ e[0] = '\0';
+ e++;
+ if (e[0] == '\r') {
+ e[0] = '\0';
+ e++;
+ }
+ nline = e;
+ }
+
+ NWRAP_VERBOSE(("%s:'%s'\n",__location__, line));
+
+ if (strlen(line) == 0) {
+ continue;
+ }
+
+ ok = nwrap->parse_line(nwrap, line);
+ if (!ok) {
+ goto failed;
+ }
+ }
+
+done:
+ nwrap->buf = buf;
+ return true;
+
+failed:
+ if (buf) free(buf);
+ return false;
+}
+
+static void nwrap_cache_unload(struct nwrap_cache *nwrap)
+{
+ nwrap->unload(nwrap);
+
+ if (nwrap->buf) free(nwrap->buf);
+
+ nwrap->buf = NULL;
+}
+
+static void nwrap_cache_reload(struct nwrap_cache *nwrap)
+{
+ struct stat st;
+ int ret;
+ bool ok;
+ bool retried = false;
+
+reopen:
+ if (nwrap->fd < 0) {
+ nwrap->fd = open(nwrap->path, O_RDONLY);
+ if (nwrap->fd < 0) {
+ NWRAP_ERROR(("%s: unable to open '%s' readonly %d:%s\n",
+ __location__,
+ nwrap->path, nwrap->fd,
+ strerror(errno)));
+ return;
+ }
+ NWRAP_VERBOSE(("%s: open '%s'\n", __location__, nwrap->path));
+ }
+
+ ret = fstat(nwrap->fd, &st);
+ if (ret != 0) {
+ NWRAP_ERROR(("%s: fstat(%s) - %d:%s\n",
+ __location__,
+ nwrap->path,
+ ret, strerror(errno)));
+ return;
+ }
+
+ if (retried == false && st.st_nlink == 0) {
+ /* maybe someone has replaced the file... */
+ NWRAP_DEBUG(("%s: st_nlink == 0, reopen %s\n",
+ __location__, nwrap->path));
+ retried = true;
+ memset(&nwrap->st, 0, sizeof(nwrap->st));
+ close(nwrap->fd);
+ nwrap->fd = -1;
+ goto reopen;
+ }
+
+ if (st.st_mtime == nwrap->st.st_mtime) {
+ NWRAP_VERBOSE(("%s: st_mtime[%u] hasn't changed, skip reload\n",
+ __location__, (unsigned)st.st_mtime));
+ return;
+ }
+ NWRAP_DEBUG(("%s: st_mtime has changed [%u] => [%u], start reload\n",
+ __location__, (unsigned)st.st_mtime,
+ (unsigned)nwrap->st.st_mtime));
+
+ nwrap->st = st;
+
+ nwrap_cache_unload(nwrap);
+
+ ok = nwrap_parse_file(nwrap);
+ if (!ok) {
+ NWRAP_ERROR(("%s: failed to reload %s\n",
+ __location__, nwrap->path));
+ nwrap_cache_unload(nwrap);
+ }
+ NWRAP_DEBUG(("%s: reloaded %s\n",
+ __location__, nwrap->path));
+}
+
+/*
+ * the caller has to call nwrap_unload() on failure
+ */
+static bool nwrap_pw_parse_line(struct nwrap_cache *nwrap, char *line)
+{
+ struct nwrap_pw *nwrap_pw;
+ char *c;
+ char *p;
+ char *e;
+ struct passwd *pw;
+ size_t list_size;
+
+ nwrap_pw = (struct nwrap_pw *)nwrap->private_data;
+
+ list_size = sizeof(*nwrap_pw->list) * (nwrap_pw->num+1);
+ pw = (struct passwd *)realloc(nwrap_pw->list, list_size);
+ if (!pw) {
+ NWRAP_ERROR(("%s:realloc(%u) failed\n",
+ __location__, list_size));
+ return false;
+ }
+ nwrap_pw->list = pw;
+
+ pw = &nwrap_pw->list[nwrap_pw->num];
+
+ c = line;
+
+ /* name */
+ p = strchr(c, ':');
+ if (!p) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s'\n",
+ __location__, line, c));
+ return false;
+ }
+ *p = '\0';
+ p++;
+ pw->pw_name = c;
+ c = p;
+
+ NWRAP_VERBOSE(("name[%s]\n", pw->pw_name));
+
+ /* password */
+ p = strchr(c, ':');
+ if (!p) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s'\n",
+ __location__, line, c));
+ return false;
+ }
+ *p = '\0';
+ p++;
+ pw->pw_passwd = c;
+ c = p;
+
+ NWRAP_VERBOSE(("password[%s]\n", pw->pw_passwd));
+
+ /* uid */
+ p = strchr(c, ':');
+ if (!p) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s'\n",
+ __location__, line, c));
+ return false;
+ }
+ *p = '\0';
+ p++;
+ e = NULL;
+ pw->pw_uid = (uid_t)strtoul(c, &e, 10);
+ if (c == e) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s' - %s\n",
+ __location__, line, c, strerror(errno)));
+ return false;
+ }
+ if (e == NULL) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s' - %s\n",
+ __location__, line, c, strerror(errno)));
+ return false;
+ }
+ if (e[0] != '\0') {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s' - %s\n",
+ __location__, line, c, strerror(errno)));
+ return false;
+ }
+ c = p;
+
+ NWRAP_VERBOSE(("uid[%u]\n", pw->pw_uid));
+
+ /* gid */
+ p = strchr(c, ':');
+ if (!p) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s'\n",
+ __location__, line, c));
+ return false;
+ }
+ *p = '\0';
+ p++;
+ e = NULL;
+ pw->pw_gid = (gid_t)strtoul(c, &e, 10);
+ if (c == e) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s' - %s\n",
+ __location__, line, c, strerror(errno)));
+ return false;
+ }
+ if (e == NULL) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s' - %s\n",
+ __location__, line, c, strerror(errno)));
+ return false;
+ }
+ if (e[0] != '\0') {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s' - %s\n",
+ __location__, line, c, strerror(errno)));
+ return false;
+ }
+ c = p;
+
+ NWRAP_VERBOSE(("gid[%u]\n", pw->pw_gid));
+
+ /* gecos */
+ p = strchr(c, ':');
+ if (!p) {
+ NWRAP_ERROR(("%s:invalid line[%s]: '%s'\n",
+ __location__, line, c));
+ return false;
+ }
+ *p = '\0';
+ p++;
+ pw->pw_gecos = c;
+ c = p;
+
+ NWRAP_VERBOSE(("gecos[%s]\n", pw->pw_gecos));
+
+ /* dir */
+ p = strchr(c, ':');
+ if (!p) {
+ NWRAP_ERROR(("%s:'%s'\n",__location__,c));
+ return false;
+ }
+ *p = '\0';
+ p++;
+ pw->pw_dir = c;
+ c = p;
+
+ NWRAP_VERBOSE(("dir[%s]\n", pw->pw_dir));
+
+ /* shell */
+ pw->pw_shell = c;
+ NWRAP_VERBOSE(("shell[%s]\n", pw->pw_shell));
+
+ NWRAP_DEBUG(("add user[%s:%s:%u:%u:%s:%s:%s]\n",
+ pw->pw_name, pw->pw_passwd,
+ pw->pw_uid, pw->pw_gid,
+ pw->pw_gecos, pw->pw_dir, pw->pw_shell));
+
+ nwrap_pw->num++;
+ return true;
+}
+
+static void nwrap_pw_unload(struct nwrap_cache *nwrap)
+{
+ struct nwrap_pw *nwrap_pw;
+ nwrap_pw = (struct nwrap_pw *)nwrap->private_data;
+
+ if (nwrap_pw->list) free(nwrap_pw->list);
+
+ nwrap_pw->list = NULL;
+ nwrap_pw->num = 0;
+ nwrap_pw->idx = 0;
+}
+
+static int nwrap_pw_copy_r(const struct passwd *src, struct passwd *dst,
+ char *buf, size_t buflen, struct passwd **destp)
+{
+ char *first;
+ char *last;
+ off_t ofs;
+
+ first = src->pw_name;
+
+ last = src->pw_shell;
+ while (*last) last++;
+
+ ofs = PTR_DIFF(last + 1, first);
+
+ if (ofs > buflen) {
+ return ERANGE;
+ }
+
+ memcpy(buf, first, ofs);
+
+ ofs = PTR_DIFF(src->pw_name, first);
+ dst->pw_name = buf + ofs;
+ ofs = PTR_DIFF(src->pw_passwd, first);
+ dst->pw_passwd = buf + ofs;
+ dst->pw_uid = src->pw_uid;
+ dst->pw_gid = src->pw_gid;
+ ofs = PTR_DIFF(src->pw_gecos, first);
+ dst->pw_gecos = buf + ofs;
+ ofs = PTR_DIFF(src->pw_dir, first);
+ dst->pw_dir = buf + ofs;
+ ofs = PTR_DIFF(src->pw_shell, first);
+ dst->pw_shell = buf + ofs;
+
+ return 0;
+}
+
/* user functions */
_PUBLIC_ struct passwd *nwrap_getpwnam(const char *name)
{
- return real_getpwnam(name);
+ int i;
+
+ if (!nwrap_enabled()) {
+ return real_getpwnam(name);
+ }
+
+ nwrap_cache_reload(nwrap_pw_global.cache);
+
+ for (i=0; i<nwrap_pw_global.num; i++) {
+ if (strcmp(nwrap_pw_global.list[i].pw_name, name) == 0) {
+ NWRAP_DEBUG(("%s: user[%s] found\n",
+ __location__, name));
+ return &nwrap_pw_global.list[i];
+ }
+ NWRAP_VERBOSE(("%s: user[%s] does not match [%s]\n",
+ __location__, name,
+ nwrap_pw_global.list[i].pw_name));
+ }
+
+ NWRAP_DEBUG(("%s: user[%s] not found\n", __location__, name));
+
+ errno = ENOENT;
+ return NULL;
}
-_PUBLIC_ int nwrap_getpwnam_r(const char *name, struct passwd *pwbuf,
- char *buf, size_t buflen, struct passwd **pwbufp)
+_PUBLIC_ int nwrap_getpwnam_r(const char *name, struct passwd *pwdst,
+ char *buf, size_t buflen, struct passwd **pwdstp)
{
- return real_getpwnam_r(name, pwbuf, buf, buflen, pwbufp);
+ struct passwd *pw;
+
+ if (!nwrap_enabled()) {
+ return real_getpwnam_r(name, pwdst, buf, buflen, pwdstp);
+ }
+
+ pw = nwrap_getpwnam(name);
+ if (!pw) {
+ if (errno == 0) {
+ return ENOENT;
+ }
+ return errno;
+ }
+
+ return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
}
_PUBLIC_ struct passwd *nwrap_getpwuid(uid_t uid)
{
- return real_getpwuid(uid);
+ int i;
+
+ if (!nwrap_enabled()) {
+ return real_getpwuid(uid);
+ }
+
+ nwrap_cache_reload(nwrap_pw_global.cache);
+
+ for (i=0; i<nwrap_pw_global.num; i++) {
+ if (nwrap_pw_global.list[i].pw_uid == uid) {
+ NWRAP_DEBUG(("%s: uid[%u] found\n",
+ __location__, uid));
+ return &nwrap_pw_global.list[i];
+ }
+ NWRAP_VERBOSE(("%s: uid[%u] does not match [%u]\n",
+ __location__, uid,
+ nwrap_pw_global.list[i].pw_uid));
+ }
+
+ NWRAP_DEBUG(("%s: uid[%u] not found\n", __location__, uid));
+
+ errno = ENOENT;
+ return NULL;
}
-_PUBLIC_ int nwrap_getpwuid_r(uid_t uid, struct passwd *pwbuf,
- char *buf, size_t buflen, struct passwd **pwbufp)
+_PUBLIC_ int nwrap_getpwuid_r(uid_t uid, struct passwd *pwdst,
+ char *buf, size_t buflen, struct passwd **pwdstp)
{
- return real_getpwuid_r(uid, pwbuf, buf, buflen, pwbufp);
+ struct passwd *pw;
+
+ if (!nwrap_enabled()) {
+ return real_getpwuid_r(uid, pwdst, buf, buflen, pwdstp);
+ }
+
+ pw = nwrap_getpwuid(uid);
+ if (!pw) {
+ if (errno == 0) {
+ return ENOENT;
+ }
+ return errno;
+ }
+
+ return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
}
/* user enum functions */
_PUBLIC_ void nwrap_setpwent(void)
{
- real_setpwent();
+ if (!nwrap_enabled()) {
+ real_setpwent();
+ }
+
+ nwrap_pw_global.idx = 0;
}
_PUBLIC_ struct passwd *nwrap_getpwent(void)
{
- return real_getpwent();
+ struct passwd *pw;
+
+ if (!nwrap_enabled()) {
+ return real_getpwent();
+ }
+
+ if (nwrap_pw_global.idx == 0) {
+ nwrap_cache_reload(nwrap_pw_global.cache);
+ }
+
+ if (nwrap_pw_global.idx >= nwrap_pw_global.num) {
+ errno = ENOENT;
+ return NULL;
+ }
+
+ pw = &nwrap_pw_global.list[nwrap_pw_global.idx++];
+
+ NWRAP_VERBOSE(("%s: return user[%s] uid[%u]\n",
+ __location__, pw->pw_name, pw->pw_uid));
+
+ return pw;
}
-_PUBLIC_ int nwrap_getpwent_r(struct passwd *pwbuf, char *buf,
- size_t buflen, struct passwd **pwbufp)
+_PUBLIC_ int nwrap_getpwent_r(struct passwd *pwdst, char *buf,
+ size_t buflen, struct passwd **pwdstp)
{
- return real_getpwent_r(pwbuf, buf, buflen, pwbufp);
+ struct passwd *pw;
+
+ if (!nwrap_enabled()) {
+ return real_getpwent_r(pwdst, buf, buflen, pwdstp);
+ }
+
+ pw = nwrap_getpwent();
+ if (!pw) {
+ if (errno == 0) {
+ return ENOENT;
+ }
+ return errno;
+ }
+
+ return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
}
_PUBLIC_ void nwrap_endpwent(void)
{
- real_endpwent();
+ if (!nwrap_enabled()) {
+ real_endpwent();
+ }
+
+ nwrap_pw_global.idx = 0;
}
/* misc functions */