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Diffstat (limited to 'nss_mapuid.c')
-rw-r--r--nss_mapuid.c261
1 files changed, 129 insertions, 132 deletions
diff --git a/nss_mapuid.c b/nss_mapuid.c
index f97b28e..cc6c5ec 100644
--- a/nss_mapuid.c
+++ b/nss_mapuid.c
@@ -17,7 +17,6 @@
* along with this program - see the file COPYING.
*/
-
/*
* This plugin implements getpwuid_r for NSS to map a UID back to
* a mapped username account, set up via nss_mapuser.
@@ -48,8 +47,7 @@
#include <dirent.h>
#include <ctype.h>
-
-static const char *nssname = "nss_mapuid"; /* for syslogs */
+static const char *nssname = "nss_mapuid"; /* for syslogs */
static const char dbdir[] = "/run/mapuser/";
/*
@@ -66,98 +64,97 @@ extern const char *__progname;
*/
static int chk_session_file(char *sfile, uid_t uid, struct pwbuf *pb)
{
- char rbuf[256], user[64];
- FILE *mapf;
- uid_t auid = 0;
- int ret = 1;
-
- mapf = fopen(sfile, "r");
- if (!mapf) {
- if( debug)
- syslog(LOG_DEBUG, "%s: session map file %s open fails: %m",
- nssname, sfile);
- return ret;
- }
- user[0] = '\0';
- while(fgets(rbuf, sizeof rbuf, mapf)) {
- strtok(rbuf, " \t\n\r\f"); /* terminate buffer at first whitespace */
- if(!strncmp("user=", rbuf, 5)) { /* should precede auid */
- snprintf(user, sizeof user, "%s", rbuf+5);
- if (auid) /* found out of order, but now have both */
- break;
- }
- else if(!strncmp("auid=", rbuf, 5)) {
- uid_t fuid = (uid_t)strtoul(rbuf+5, NULL, 10);
- if (fuid && uid == fuid) {
- auid = fuid;
- if (user[0])
- break; /* normal ordering, else keep looking for user */
- }
- }
- }
- fclose(mapf);
-
- if (auid && user[0]) /* otherwise not a match */
- ret = get_pw_mapuser(user, pb); /* should always succeed */
-
- return ret;
+ char rbuf[256], user[64];
+ FILE *mapf;
+ uid_t auid = 0;
+ int ret = 1;
+
+ mapf = fopen(sfile, "r");
+ if (!mapf) {
+ if (debug)
+ syslog(LOG_DEBUG,
+ "%s: session map file %s open fails: %m",
+ nssname, sfile);
+ return ret;
+ }
+ user[0] = '\0';
+ while (fgets(rbuf, sizeof rbuf, mapf)) {
+ strtok(rbuf, " \t\n\r\f"); /* terminate buffer at first whitespace */
+ if (!strncmp("user=", rbuf, 5)) { /* should precede auid */
+ snprintf(user, sizeof user, "%s", rbuf + 5);
+ if (auid) /* found out of order, but now have both */
+ break;
+ } else if (!strncmp("auid=", rbuf, 5)) {
+ uid_t fuid = (uid_t) strtoul(rbuf + 5, NULL, 10);
+ if (fuid && uid == fuid) {
+ auid = fuid;
+ if (user[0])
+ break; /* normal ordering, else keep looking for user */
+ }
+ }
+ }
+ fclose(mapf);
+
+ if (auid && user[0]) /* otherwise not a match */
+ ret = get_pw_mapuser(user, pb); /* should always succeed */
+
+ return ret;
}
/* find mapping for this sessionid */
-static int
-find_mapped_name(struct pwbuf *pb, uid_t uid, uint32_t session)
+static int find_mapped_name(struct pwbuf *pb, uid_t uid, uint32_t session)
{
- char sessfile[sizeof dbdir + 11];
+ char sessfile[sizeof dbdir + 11];
- snprintf(sessfile, sizeof sessfile, "%s%u", dbdir, session);
- return chk_session_file(sessfile, uid, pb);
+ snprintf(sessfile, sizeof sessfile, "%s%u", dbdir, session);
+ return chk_session_file(sessfile, uid, pb);
}
static int find_mappingfile(struct pwbuf *pb, uid_t uid)
{
- DIR *dir;
- struct dirent *ent;
- int ret = 1;
-
- dir = opendir(dbdir);
- if (!dir) { /* can happen if no mapped users logged in */
- if (debug > 1)
- syslog(LOG_DEBUG, "%s: Unable to open mapping directory %s: %m",
- nssname, dbdir);
- return 1;
- }
-
- /* Loop through all numeric files in dbdir, check for matching uid */
- while (ret && (ent = readdir(dir))) {
- char sessfile[sizeof dbdir + 11];
- if (!isdigit(ent->d_name[0])) /* sanity check on session file */
- continue;
- snprintf(sessfile, sizeof sessfile, "%s%s", dbdir, ent->d_name);
- ret = chk_session_file(sessfile, uid, pb);
- }
- if (ret && debug)
- syslog(LOG_DEBUG, "%s: uid %u mapping not found in map files",
- nssname, uid);
- closedir(dir);
- return ret;
+ DIR *dir;
+ struct dirent *ent;
+ int ret = 1;
+
+ dir = opendir(dbdir);
+ if (!dir) { /* can happen if no mapped users logged in */
+ if (debug > 1)
+ syslog(LOG_DEBUG,
+ "%s: Unable to open mapping directory %s: %m",
+ nssname, dbdir);
+ return 1;
+ }
+
+ /* Loop through all numeric files in dbdir, check for matching uid */
+ while (ret && (ent = readdir(dir))) {
+ char sessfile[sizeof dbdir + 11];
+ if (!isdigit(ent->d_name[0])) /* sanity check on session file */
+ continue;
+ snprintf(sessfile, sizeof sessfile, "%s%s", dbdir, ent->d_name);
+ ret = chk_session_file(sessfile, uid, pb);
+ }
+ if (ret && debug)
+ syslog(LOG_DEBUG, "%s: uid %u mapping not found in map files",
+ nssname, uid);
+ closedir(dir);
+ return ret;
}
-static uint32_t
-get_sessionid(void)
+static uint32_t get_sessionid(void)
{
- int fd = -1, cnt;
- uint32_t id = 0U;
- static char buf[12];
-
- fd = open("/proc/self/sessionid", O_RDONLY);
- if(fd != -1) {
- cnt = read(fd, buf, sizeof(buf));
- close(fd);
- }
- if(fd != -1 && cnt > 0) {
- id = strtoul(buf, NULL, 0);
- }
- return id;
+ int fd = -1, cnt;
+ uint32_t id = 0U;
+ static char buf[12];
+
+ fd = open("/proc/self/sessionid", O_RDONLY);
+ if (fd != -1) {
+ cnt = read(fd, buf, sizeof(buf));
+ close(fd);
+ }
+ if (fd != -1 && cnt > 0) {
+ id = strtoul(buf, NULL, 0);
+ }
+ return id;
}
/*
@@ -184,55 +181,55 @@ get_sessionid(void)
* just get the files, ldap, etc. entry for the UID
* Returns the first match if multiple mapped users.
*/
-__attribute__ ((visibility ("default")))
+__attribute__ ((visibility("default")))
enum nss_status _nss_mapuid_getpwuid_r(uid_t uid, struct passwd *pw,
- char *buffer, size_t buflen, int *errnop)
+ char *buffer, size_t buflen, int *errnop)
{
- struct pwbuf pb;
- enum nss_status status = NSS_STATUS_NOTFOUND;
- uint32_t session;
-
- /*
- * the useradd family will not add/mod/del users correctly with
- * the mapuid functionality, so return immediately if we are
- * running as part of those processes.
- */
- if (__progname && (!strcmp(__progname, "useradd") ||
- !strcmp(__progname, "usermod") ||
- !strcmp(__progname, "userdel")))
- return status;
-
- /* this can happen for permission reasons, do don't complain except
- * at debug */
- if (nss_mapuser_config(errnop, nssname) == 1) {
- return status; /* syslog already done */
- }
-
-
- if (min_uid != ~0U && uid < min_uid) {
- if(debug > 1)
- syslog(LOG_DEBUG, "%s: uid %u < min_uid %u, don't lookup",
- nssname, uid, min_uid);
- return status;
- }
-
- /* marshal the args for the lower level functions */
- pb.pw = pw;
- pb.buf = buffer;
- pb.buflen = buflen;
- pb.errnop = errnop;
- pb.name = NULL;
-
- /* session needs to be set to lookup this user. May also be set
- * for other users.
- */
- session = get_sessionid();
- if(session && !find_mapped_name(&pb, uid, session))
- status = NSS_STATUS_SUCCESS;
- if(status != NSS_STATUS_SUCCESS) {
- /* lookup by some other user or unrelated process, try dir lookup */
- if (!find_mappingfile(&pb, uid))
- status = NSS_STATUS_SUCCESS;
- }
- return status;
+ struct pwbuf pb;
+ enum nss_status status = NSS_STATUS_NOTFOUND;
+ uint32_t session;
+
+ /*
+ * the useradd family will not add/mod/del users correctly with
+ * the mapuid functionality, so return immediately if we are
+ * running as part of those processes.
+ */
+ if (__progname && (!strcmp(__progname, "useradd") ||
+ !strcmp(__progname, "usermod") ||
+ !strcmp(__progname, "userdel")))
+ return status;
+
+ /* this can happen for permission reasons, do don't complain except
+ * at debug */
+ if (nss_mapuser_config(errnop, nssname) == 1) {
+ return status; /* syslog already done */
+ }
+
+ if (min_uid != ~0U && uid < min_uid) {
+ if (debug > 1)
+ syslog(LOG_DEBUG,
+ "%s: uid %u < min_uid %u, don't lookup", nssname,
+ uid, min_uid);
+ return status;
+ }
+
+ /* marshal the args for the lower level functions */
+ pb.pw = pw;
+ pb.buf = buffer;
+ pb.buflen = buflen;
+ pb.errnop = errnop;
+ pb.name = NULL;
+
+ /* session needs to be set to lookup this user. May also be set
+ * for other users.
+ */
+ session = get_sessionid();
+ if (session && !find_mapped_name(&pb, uid, session))
+ status = NSS_STATUS_SUCCESS;
+ if (status != NSS_STATUS_SUCCESS) {
+ /* lookup by some other user or unrelated process, try dir lookup */
+ if (!find_mappingfile(&pb, uid))
+ status = NSS_STATUS_SUCCESS;
+ }
+ return status;
}
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