#include "gss_util.h"
#include "krb5_util.h"
#include "context.h"
+#include "nfsrpc.h"
/*
* pollarray:
int pollsize; /* the size of pollaray (in pollfd's) */
+/*
+ * convert a presentation address string to a sockaddr_storage struct. Returns
+ * true on success and false on failure.
+ */
+static int
+addrstr_to_sockaddr(struct sockaddr *sa, const char *addr, const int port)
+{
+ struct sockaddr_in *s4 = (struct sockaddr_in *) sa;
+
+ if (inet_pton(AF_INET, addr, &s4->sin_addr)) {
+ s4->sin_family = AF_INET;
+ s4->sin_port = htons(port);
+ } else {
+ printerr(0, "ERROR: unable to convert %s to address\n", addr);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * convert a sockaddr to a hostname
+ */
+static char *
+sockaddr_to_hostname(const struct sockaddr *sa, const char *addr)
+{
+ socklen_t addrlen;
+ int err;
+ char *hostname;
+ char hbuf[NI_MAXHOST];
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ addrlen = sizeof(struct sockaddr_in);
+ break;
+ default:
+ printerr(0, "ERROR: unrecognized addr family %d\n",
+ sa->sa_family);
+ return NULL;
+ }
+
+ err = getnameinfo(sa, addrlen, hbuf, sizeof(hbuf), NULL, 0,
+ NI_NAMEREQD);
+ if (err) {
+ printerr(0, "ERROR: unable to resolve %s to hostname: %s\n",
+ addr, err == EAI_SYSTEM ? strerror(err) :
+ gai_strerror(err));
+ return NULL;
+ }
+
+ hostname = strdup(hbuf);
+
+ return hostname;
+}
+
/* XXX buffer problems: */
static int
read_service_info(char *info_file_name, char **servicename, char **servername,
- int *prog, int *vers, char **protocol, int *port) {
+ int *prog, int *vers, char **protocol,
+ struct sockaddr *addr) {
#define INFOBUFLEN 256
- char buf[INFOBUFLEN];
+ char buf[INFOBUFLEN + 1];
static char dummy[128];
int nbytes;
static char service[128];
char protoname[16];
char cb_port[128];
char *p;
- in_addr_t inaddr;
int fd = -1;
- struct hostent *ent = NULL;
int numfields;
+ int port = 0;
*servicename = *servername = *protocol = NULL;
if ((nbytes = read(fd, buf, INFOBUFLEN)) == -1)
goto fail;
close(fd);
+ buf[nbytes] = '\0';
numfields = sscanf(buf,"RPC server: %127s\n"
"service: %127s %15s version %15s\n"
if((*prog != 100003) || ((*vers != 2) && (*vers != 3) && (*vers != 4)))
goto fail;
- /* create service name */
- inaddr = inet_addr(address);
- if (!(ent = gethostbyaddr(&inaddr, sizeof(inaddr), AF_INET))) {
- printerr(0, "ERROR: can't resolve server %s name\n", address);
- goto fail;
+ if (cb_port[0] != '\0') {
+ port = atoi(cb_port);
+ if (port < 0 || port > 65535)
+ goto fail;
}
- if (!(*servername = calloc(strlen(ent->h_name) + 1, 1)))
+
+ if (!addrstr_to_sockaddr(addr, address, port))
+ goto fail;
+
+ *servername = sockaddr_to_hostname(addr, address);
+ if (*servername == NULL)
goto fail;
- memcpy(*servername, ent->h_name, strlen(ent->h_name));
- snprintf(buf, INFOBUFLEN, "%s@%s", service, ent->h_name);
+
+ nbytes = snprintf(buf, INFOBUFLEN, "%s@%s", service, *servername);
+ if (nbytes > INFOBUFLEN)
+ goto fail;
+
if (!(*servicename = calloc(strlen(buf) + 1, 1)))
goto fail;
memcpy(*servicename, buf, strlen(buf));
- if (cb_port[0] != '\0')
- *port = atoi(cb_port);
if (!(*protocol = strdup(protoname)))
goto fail;
fail:
printerr(0, "ERROR: failed to read service info\n");
if (fd != -1) close(fd);
- if (*servername) free(*servername);
- if (*servicename) free(*servicename);
- if (*protocol) free(*protocol);
+ free(*servername);
+ free(*servicename);
+ free(*protocol);
+ *servicename = *servername = *protocol = NULL;
return -1;
}
if (clp->dir_fd != -1) close(clp->dir_fd);
if (clp->krb5_fd != -1) close(clp->krb5_fd);
if (clp->spkm3_fd != -1) close(clp->spkm3_fd);
- if (clp->dirname) free(clp->dirname);
- if (clp->servicename) free(clp->servicename);
- if (clp->servername) free(clp->servername);
- if (clp->protocol) free(clp->protocol);
+ free(clp->dirname);
+ free(clp->servicename);
+ free(clp->servername);
+ free(clp->protocol);
free(clp);
}
if ((clp->servicename == NULL) &&
read_service_info(info_file_name, &clp->servicename,
&clp->servername, &clp->prog, &clp->vers,
- &clp->protocol, &clp->port))
+ &clp->protocol, (struct sockaddr *) &clp->addr))
return -1;
return 0;
}
return -1;
}
+/*
+ * If the port isn't already set, do an rpcbind query to the remote server
+ * using the program and version and get the port.
+ *
+ * Newer kernels send the value of the port= mount option in the "info"
+ * file for the upcall or '0' for NFSv2/3. For NFSv4 it sends the value
+ * of the port= option or '2049'. The port field in a new sockaddr should
+ * reflect the value that was sent by the kernel.
+ */
+static int
+populate_port(struct sockaddr *sa, const socklen_t salen,
+ const rpcprog_t program, const rpcvers_t version,
+ const unsigned short protocol)
+{
+ struct sockaddr_in *s4 = (struct sockaddr_in *) sa;
+ unsigned short port;
+
+ /*
+ * Newer kernels send the port in the upcall. If we already have
+ * the port, there's no need to look it up.
+ */
+ switch (sa->sa_family) {
+ case AF_INET:
+ if (s4->sin_port != 0) {
+ printerr(2, "DEBUG: port already set to %d\n",
+ ntohs(s4->sin_port));
+ return 1;
+ }
+ break;
+ default:
+ printerr(0, "ERROR: unsupported address family %d\n",
+ sa->sa_family);
+ return 0;
+ }
+
+ /*
+ * Newer kernels that send the port in the upcall set the value to
+ * 2049 for NFSv4 mounts when one isn't specified. The check below is
+ * only for kernels that don't send the port in the upcall. For those
+ * we either have to do an rpcbind query or set it to the standard
+ * port. Doing a query could be problematic (firewalls, etc), so take
+ * the latter approach.
+ */
+ if (program == 100003 && version == 4) {
+ port = 2049;
+ goto set_port;
+ }
+
+ port = nfs_getport(sa, salen, program, version, protocol);
+ if (!port) {
+ printerr(0, "ERROR: unable to obtain port for prog %ld "
+ "vers %ld\n", program, version);
+ return 0;
+ }
+
+set_port:
+ printerr(2, "DEBUG: setting port to %hu for prog %lu vers %lu\n", port,
+ program, version);
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ s4->sin_port = htons(port);
+ break;
+ }
+
+ return 1;
+}
+
/*
* Create an RPC connection and establish an authenticated
* gss context with a server.
AUTH *auth = NULL;
uid_t save_uid = -1;
int retval = -1;
- int errcode;
OM_uint32 min_stat;
char rpc_errmsg[1024];
- int sockp = RPC_ANYSOCK;
- int sendsz = 32768, recvsz = 32768;
- struct addrinfo ai_hints, *a = NULL;
- char service[64];
- char *at_sign;
+ int protocol;
+ struct timeval timeout = {5, 0};
+ struct sockaddr *addr = (struct sockaddr *) &clp->addr;
+ socklen_t salen;
/* Create the context as the user (not as root) */
save_uid = geteuid();
printerr(2, "creating %s client for server %s\n", clp->protocol,
clp->servername);
- memset(&ai_hints, '\0', sizeof(ai_hints));
- ai_hints.ai_family = PF_INET;
- ai_hints.ai_flags |= AI_CANONNAME;
if ((strcmp(clp->protocol, "tcp")) == 0) {
- ai_hints.ai_socktype = SOCK_STREAM;
- ai_hints.ai_protocol = IPPROTO_TCP;
+ protocol = IPPROTO_TCP;
} else if ((strcmp(clp->protocol, "udp")) == 0) {
- ai_hints.ai_socktype = SOCK_DGRAM;
- ai_hints.ai_protocol = IPPROTO_UDP;
+ protocol = IPPROTO_UDP;
} else {
printerr(0, "WARNING: unrecognized protocol, '%s', requested "
"for connection to server %s for user with uid %d\n",
goto out_fail;
}
- /* extract the service name from clp->servicename */
- if ((at_sign = strchr(clp->servicename, '@')) == NULL) {
- printerr(0, "WARNING: servicename (%s) not formatted as "
- "expected with service@host\n", clp->servicename);
+ switch (addr->sa_family) {
+ case AF_INET:
+ salen = sizeof(struct sockaddr_in);
+ break;
+ default:
+ printerr(1, "ERROR: Unknown address family %d\n",
+ addr->sa_family);
goto out_fail;
}
- if ((at_sign - clp->servicename) >= sizeof(service)) {
- printerr(0, "WARNING: service portion of servicename (%s) "
- "is too long!\n", clp->servicename);
- goto out_fail;
- }
- strncpy(service, clp->servicename, at_sign - clp->servicename);
- service[at_sign - clp->servicename] = '\0';
- errcode = getaddrinfo(clp->servername, service, &ai_hints, &a);
- if (errcode) {
- printerr(0, "WARNING: Error from getaddrinfo for server "
- "'%s': %s\n", clp->servername, gai_strerror(errcode));
+ if (!populate_port(addr, salen, clp->prog, clp->vers, protocol))
goto out_fail;
- }
- if (a == NULL) {
- printerr(0, "WARNING: No address information found for "
- "connection to server %s for user with uid %d\n",
+ rpc_clnt = nfs_get_rpcclient(addr, salen, protocol, clp->prog,
+ clp->vers, &timeout);
+ if (!rpc_clnt) {
+ snprintf(rpc_errmsg, sizeof(rpc_errmsg),
+ "WARNING: can't create %s rpc_clnt to server %s for "
+ "user with uid %d",
+ protocol == IPPROTO_TCP ? "tcp" : "udp",
clp->servername, uid);
+ printerr(0, "%s\n",
+ clnt_spcreateerror(rpc_errmsg));
goto out_fail;
}
- if (clp->port)
- ((struct sockaddr_in *)a->ai_addr)->sin_port = htons(clp->port);
- if (a->ai_protocol == IPPROTO_TCP) {
- if ((rpc_clnt = clnttcp_create(
- (struct sockaddr_in *) a->ai_addr,
- clp->prog, clp->vers, &sockp,
- sendsz, recvsz)) == NULL) {
- snprintf(rpc_errmsg, sizeof(rpc_errmsg),
- "WARNING: can't create tcp rpc_clnt "
- "for server %s for user with uid %d",
- clp->servername, uid);
- printerr(0, "%s\n",
- clnt_spcreateerror(rpc_errmsg));
- goto out_fail;
- }
- } else if (a->ai_protocol == IPPROTO_UDP) {
- const struct timeval timeout = {5, 0};
- if ((rpc_clnt = clntudp_bufcreate(
- (struct sockaddr_in *) a->ai_addr,
- clp->prog, clp->vers, timeout,
- &sockp, sendsz, recvsz)) == NULL) {
- snprintf(rpc_errmsg, sizeof(rpc_errmsg),
- "WARNING: can't create udp rpc_clnt "
- "for server %s for user with uid %d",
- clp->servername, uid);
- printerr(0, "%s\n",
- clnt_spcreateerror(rpc_errmsg));
- goto out_fail;
- }
- } else {
- /* Shouldn't happen! */
- printerr(0, "ERROR: requested protocol '%s', but "
- "got addrinfo with protocol %d\n",
- clp->protocol, a->ai_protocol);
- goto out_fail;
- }
- /* We're done with this */
- freeaddrinfo(a);
- a = NULL;
printerr(2, "creating context with server %s\n", clp->servicename);
auth = authgss_create_default(rpc_clnt, clp->servicename, &sec);
out:
if (sec.cred != GSS_C_NO_CREDENTIAL)
gss_release_cred(&min_stat, &sec.cred);
- if (a != NULL) freeaddrinfo(a);
/* Restore euid to original value */
if ((save_uid != -1) && (setfsuid(save_uid) != uid)) {
printerr(0, "WARNING: Failed to restore fsuid"
projects / nfs-utils.git / blobdiff