From: Steve Dickson Date: Thu, 17 Nov 2011 19:39:43 +0000 (-0500) Subject: nfsidmap: Allow a particular key to be revoked. X-Git-Tag: nfs-utils-1-2-6-rc4~2 X-Git-Url: https://git.decadent.org.uk/gitweb/?a=commitdiff_plain;h=24d0b823f10f9cae2eba9b22fb830dd8dc3fb15a;p=nfs-utils.git nfsidmap: Allow a particular key to be revoked. Introducing three new command line arguments that allow particular keys to be revoke -u will remove a uid key -g will revoke a gid key -r will revoke both the uid and gid keys A user name has also needs to be supply with these new flags. Signed-off-by: Steve Dickson --- diff --git a/utils/nfsidmap/nfsidmap.c b/utils/nfsidmap/nfsidmap.c index cec2cb3..c6b730b 100644 --- a/utils/nfsidmap/nfsidmap.c +++ b/utils/nfsidmap/nfsidmap.c @@ -13,7 +13,7 @@ #include "xlog.h" int verbose = 0; -char *usage="Usage: %s [-v] [-c || [-t timeout] key desc]"; +char *usage="Usage: %s [-v] [-c || [-u|-g|-r key] || [-t timeout] key desc]"; #define MAX_ID_LEN 11 #define IDMAP_NAMESZ 128 @@ -26,6 +26,9 @@ char *usage="Usage: %s [-v] [-c || [-t timeout] key desc]"; #endif +#define UIDKEYS 0x1 +#define GIDKEYS 0x2 + /* * Find either a user or group id based on the name@domain string */ @@ -137,6 +140,67 @@ static int keyring_clear(char *keyring) fclose(fp); return 1; } +/* + * Revoke a key + */ +static int key_revoke(char *keystr, int keymask) +{ + FILE *fp; + char buf[BUFSIZ], *ptr; + key_serial_t key; + int mask; + + xlog_syslog(0); + + if ((fp = fopen(PROCKEYS, "r")) == NULL) { + xlog_err("fopen(%s) failed: %m", PROCKEYS); + return 1; + } + + while(fgets(buf, BUFSIZ, fp) != NULL) { + if (strstr(buf, "keyring") != NULL) + continue; + + mask = 0; + if ((ptr = strstr(buf, "uid:")) != NULL) + mask = UIDKEYS; + else if ((ptr = strstr(buf, "gid:")) != NULL) + mask = GIDKEYS; + else + continue; + + if ((keymask & mask) == 0) + continue; + + if (strncmp(ptr+4, keystr, strlen(keystr)) != NULL) + continue; + + if (verbose) { + *(strchr(buf, '\n')) = '\0'; + xlog_warn("revoking '%s'", buf); + } + /* + * The key is the first arugment in the string + */ + *(strchr(buf, ' ')) = '\0'; + sscanf(buf, "%x", &key); + + if (keyctl_revoke(key) < 0) { + xlog_err("keyctl_revoke(0x%x) failed: %m", key); + fclose(fp); + return 1; + } + + keymask &= ~mask; + if (keymask == 0) { + fclose(fp); + return 0; + } + } + xlog_err("'%s' key was not found.", keystr); + fclose(fp); + return 1; +} int main(int argc, char **argv) { @@ -146,8 +210,8 @@ int main(int argc, char **argv) int rc = 1, opt; int timeout = 600; key_serial_t key; - char *progname; - int clearring; + char *progname, *keystr = NULL; + int clearring, keymask = 0; /* Set the basename */ if ((progname = strrchr(argv[0], '/')) != NULL) @@ -157,8 +221,20 @@ int main(int argc, char **argv) xlog_open(progname); - while ((opt = getopt(argc, argv, "ct:v")) != -1) { + while ((opt = getopt(argc, argv, "u:g:r:ct:v")) != -1) { switch (opt) { + case 'u': + keymask = UIDKEYS; + keystr = strdup(optarg); + break; + case 'g': + keymask = GIDKEYS; + keystr = strdup(optarg); + break; + case 'r': + keymask = GIDKEYS|UIDKEYS; + keystr = strdup(optarg); + break; case 'c': clearring++; break; @@ -174,6 +250,10 @@ int main(int argc, char **argv) } } + if (keystr) { + rc = key_revoke(keystr, keymask); + return rc; + } if (clearring) { rc = keyring_clear(DEFAULT_KEYRING); return rc; diff --git a/utils/nfsidmap/nfsidmap.man b/utils/nfsidmap/nfsidmap.man index 9badb3f..3a3a523 100644 --- a/utils/nfsidmap/nfsidmap.man +++ b/utils/nfsidmap/nfsidmap.man @@ -9,6 +9,8 @@ nfsidmap \- The NFS idmapper upcall program .B "nfsidmap [-v] [-t timeout] key desc" .br .B "nfsidmap [-v] [-c]" +.br +.B "nfsidmap [-v] [-u|-g|-r user]" .SH DESCRIPTION The file .I /usr/sbin/nfsidmap @@ -20,18 +22,29 @@ is called by /sbin/request-key, and will perform the translation and initialize a key with the resulting information. .PP .I nfsidmap -can also used to clear the keyring of all the keys. -This is useful when all the mappings have failed to due to an DNS outage -or some other error resulting in all the cached uid/gid to be invalid. +can also used to clear the keyring of all the keys or +revoke one particular key. +This is useful when the id mappings have failed to due +to a lookup error resulting in all the cached uids/gids to be set +to the user id nobody. .SH OPTIONS .TP .B -c Clear the keyring of all the keys. .TP +.B -g user +Revoke the gid key of the given user. +.TP +.B -r user +Revoke both the uid and gid key of the given user. +.TP .B -t timeout Set the expiration timer, in seconds, on the key. The default is 600 seconds (10 mins). .TP +.B -u user +Revoke the uid key of the given user. +.TP .B -v Increases the verbosity of the output to syslog (can be specified multiple times).