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reorganised PPP sourcecode to 2.3.11 including some bugfix backports from 2.4.x.

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This commit is contained in:
goldsimon
2010-01-18 20:49:43 +00:00
parent e0c5c4de88
commit 972ca9e6c1
12 changed files with 688 additions and 263 deletions
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687
src/netif/ppp/auth.c
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@@ -84,63 +84,14 @@
#include <string.h>
/*************************/
/*** LOCAL DEFINITIONS ***/
/*************************/
#if 0 /* UNUSED */
/* Bits in scan_authfile return value */
#define NONWILD_SERVER 1
#define NONWILD_CLIENT 2
/* Bits in auth_pending[] */
#define PAP_WITHPEER 1
#define PAP_PEER 2
#define CHAP_WITHPEER 4
#define CHAP_PEER 8
#define ISWILD(word) (word[0] == '*' && word[1] == 0)
#endif /* UNUSED */
/************************/
/*** LOCAL DATA TYPES ***/
/************************/
/* Used for storing a sequence of words. Usually malloced. */
struct wordlist {
struct wordlist *next;
char word[1];
};
/***********************************/
/*** LOCAL FUNCTION DECLARATIONS ***/
/***********************************/
extern char *crypt (const char *, const char *);
/* Prototypes for procedures local to this file. */
static void network_phase (int);
static void check_idle (void *);
static void connect_time_expired (void *);
#if 0
static int login (char *, char *, char **, int *);
#endif
static void logout (void);
static int null_login (int);
static int get_pap_passwd (int, char *, char *);
static int have_pap_secret (void);
static int have_chap_secret (char *, char *, u32_t);
static int ip_addr_check (u32_t, struct wordlist *);
#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
static void set_allowed_addrs(int unit, struct wordlist *addrs);
static void free_wordlist (struct wordlist *);
#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
#if CBCP_SUPPORT
static void callback_phase (int);
#endif /* CBCP_SUPPORT */
/******************************/
/*** PUBLIC DATA STRUCTURES ***/
/******************************/
/*****************************/
/*** LOCAL DATA STRUCTURES ***/
/*****************************/
#if PAP_SUPPORT || CHAP_SUPPORT
/* The name by which the peer authenticated itself to us. */
static char peer_authname[MAXNAMELEN];
@@ -149,15 +100,24 @@ static char peer_authname[MAXNAMELEN];
/* Records which authentication operations haven't completed yet. */
static int auth_pending[NUM_PPP];
/* Set if we have successfully called login() */
/* Set if we have successfully called plogin() */
static int logged_in;
/* Set if we have run the /etc/ppp/auth-up script. */
static int did_authup;
static int did_authup; /* @todo, we don't need this in lwip*/
/* List of addresses which the peer may use. */
static struct wordlist *addresses[NUM_PPP];
#if 0 /* UNUSED */
/* Wordlist giving addresses which the peer may use
without authenticating itself. */
static struct wordlist *noauth_addrs;
/* Extra options to apply, from the secrets file entry for the peer. */
static struct wordlist *extra_options;
#endif /* UNUSED */
/* Number of network protocols which we have opened. */
static int num_np_open;
@@ -169,10 +129,244 @@ static int num_np_up;
static int passwd_from_file;
#endif /* PAP_SUPPORT || CHAP_SUPPORT */
#if 0 /* UNUSED */
/* Set if we require authentication only because we have a default route. */
static bool default_auth;
/* Hook to enable a plugin to control the idle time limit */
int (*idle_time_hook) __P((struct ppp_idle *)) = NULL;
/* Hook for a plugin to say whether we can possibly authenticate any peer */
int (*pap_check_hook) __P((void)) = NULL;
/* Hook for a plugin to check the PAP user and password */
int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
struct wordlist **paddrs,
struct wordlist **popts)) = NULL;
/* Hook for a plugin to know about the PAP user logout */
void (*pap_logout_hook) __P((void)) = NULL;
/* Hook for a plugin to get the PAP password for authenticating us */
int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL;
/*
* This is used to ensure that we don't start an auth-up/down
* script while one is already running.
*/
enum script_state {
s_down,
s_up
};
static enum script_state auth_state = s_down;
static enum script_state auth_script_state = s_down;
static pid_t auth_script_pid = 0;
/*
* Option variables.
* lwip: some of these are present in the ppp_settings structure
*/
bool uselogin = 0; /* Use /etc/passwd for checking PAP */
bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
bool usehostname = 0; /* Use hostname for our_name */
bool auth_required = 0; /* Always require authentication from peer */
bool allow_any_ip = 0; /* Allow peer to use any IP address */
bool explicit_remote = 0; /* User specified explicit remote name */
char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
#endif /* UNUSED */
/* Bits in auth_pending[] */
#define PAP_WITHPEER 1
#define PAP_PEER 2
#define CHAP_WITHPEER 4
#define CHAP_PEER 8
/* @todo, move this somewhere */
/* Used for storing a sequence of words. Usually malloced. */
struct wordlist {
struct wordlist *next;
char word[1];
};
extern char *crypt (const char *, const char *);
/* Prototypes for procedures local to this file. */
static void network_phase (int);
static void check_idle (void *);
static void connect_time_expired (void *);
#if 0
static int plogin (char *, char *, char **, int *);
#endif
static void plogout (void);
static int null_login (int);
static int get_pap_passwd (int, char *, char *);
static int have_pap_secret (void);
static int have_chap_secret (char *, char *, u32_t);
static int ip_addr_check (u32_t, struct wordlist *);
#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
static int scan_authfile (FILE *, char *, char *, char *,
struct wordlist **, struct wordlist **,
char *);
static void free_wordlist (struct wordlist *);
static void auth_script (char *);
static void auth_script_done (void *);
static void set_allowed_addrs (int unit, struct wordlist *addrs);
static int some_ip_ok (struct wordlist *);
static int setupapfile (char **);
static int privgroup (char **);
static int set_noauth_addr (char **);
static void check_access (FILE *, char *);
#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
#if 0 /* UNUSED */
/*
* Authentication-related options.
*/
option_t auth_options[] = {
{ "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
"Require PAP authentication from peer", 1, &auth_required },
{ "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
"Require PAP authentication from peer", 1, &auth_required },
{ "refuse-pap", o_bool, &refuse_pap,
"Don't agree to auth to peer with PAP", 1 },
{ "-pap", o_bool, &refuse_pap,
"Don't allow PAP authentication with peer", 1 },
{ "require-chap", o_bool, &lcp_wantoptions[0].neg_chap,
"Require CHAP authentication from peer", 1, &auth_required },
{ "+chap", o_bool, &lcp_wantoptions[0].neg_chap,
"Require CHAP authentication from peer", 1, &auth_required },
{ "refuse-chap", o_bool, &refuse_chap,
"Don't agree to auth to peer with CHAP", 1 },
{ "-chap", o_bool, &refuse_chap,
"Don't allow CHAP authentication with peer", 1 },
{ "name", o_string, our_name,
"Set local name for authentication",
OPT_PRIV|OPT_STATIC, NULL, MAXNAMELEN },
{ "user", o_string, user,
"Set name for auth with peer", OPT_STATIC, NULL, MAXNAMELEN },
{ "usehostname", o_bool, &usehostname,
"Must use hostname for authentication", 1 },
{ "remotename", o_string, remote_name,
"Set remote name for authentication", OPT_STATIC,
&explicit_remote, MAXNAMELEN },
{ "auth", o_bool, &auth_required,
"Require authentication from peer", 1 },
{ "noauth", o_bool, &auth_required,
"Don't require peer to authenticate", OPT_PRIV, &allow_any_ip },
{ "login", o_bool, &uselogin,
"Use system password database for PAP", 1 },
{ "papcrypt", o_bool, &cryptpap,
"PAP passwords are encrypted", 1 },
{ "+ua", o_special, (void *)setupapfile,
"Get PAP user and password from file" },
{ "password", o_string, passwd,
"Password for authenticating us to the peer", OPT_STATIC,
NULL, MAXSECRETLEN },
{ "privgroup", o_special, (void *)privgroup,
"Allow group members to use privileged options", OPT_PRIV },
{ "allow-ip", o_special, (void *)set_noauth_addr,
"Set IP address(es) which can be used without authentication",
OPT_PRIV },
{ NULL }
};
#endif /* UNUSED */
#if 0 /* UNUSED */
/*
* setupapfile - specifies UPAP info for authenticating with peer.
*/
static int
setupapfile(char **argv)
{
FILE * ufile;
int l;
lcp_allowoptions[0].neg_upap = 1;
/* open user info file */
seteuid(getuid());
ufile = fopen(*argv, "r");
seteuid(0);
if (ufile == NULL) {
option_error("unable to open user login data file %s", *argv);
return 0;
}
check_access(ufile, *argv);
/* get username */
if (fgets(user, MAXNAMELEN - 1, ufile) == NULL
|| fgets(passwd, MAXSECRETLEN - 1, ufile) == NULL){
option_error("unable to read user login data file %s", *argv);
return 0;
}
fclose(ufile);
/* get rid of newlines */
l = strlen(user);
if (l > 0 && user[l-1] == '\n')
user[l-1] = 0;
l = strlen(passwd);
if (l > 0 && passwd[l-1] == '\n')
passwd[l-1] = 0;
return (1);
}
#endif /* UNUSED */
#if 0 /* UNUSED */
/*
* privgroup - allow members of the group to have privileged access.
*/
static int
privgroup(char **argv)
{
struct group *g;
int i;
g = getgrnam(*argv);
if (g == 0) {
option_error("group %s is unknown", *argv);
return 0;
}
for (i = 0; i < ngroups; ++i) {
if (groups[i] == g->gr_gid) {
privileged = 1;
break;
}
}
return 1;
}
#endif
#if 0 /* UNUSED */
/*
* set_noauth_addr - set address(es) that can be used without authentication.
* Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
*/
static int
set_noauth_addr(char **argv)
{
char *addr = *argv;
int l = strlen(addr);
struct wordlist *wp;
wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l + 1);
if (wp == NULL)
novm("allow-ip argument");
wp->word = (char *) (wp + 1);
wp->next = noauth_addrs;
BCOPY(addr, wp->word, l);
noauth_addrs = wp;
return 1;
}
#endif /* UNUSED */
/***********************************/
/*** PUBLIC FUNCTION DEFINITIONS ***/
/***********************************/
/*
* An Open on LCP has requested a change from Dead to Establish phase.
* Do what's necessary to bring the physical layer up.
@@ -197,7 +391,7 @@ link_terminated(int unit)
return;
}
if (logged_in) {
logout();
plogout();
}
lcp_phase[unit] = PHASE_DEAD;
AUTHDEBUG((LOG_NOTICE, "Connection terminated.\n"));
@@ -212,8 +406,9 @@ link_down(int unit)
{
int i;
struct protent *protp;
AUTHDEBUG((LOG_INFO, "link_down: %d\n", unit));
if (did_authup) {
/* XXX Do link down processing. */
did_authup = 0;
@@ -229,8 +424,9 @@ link_down(int unit)
(*protp->close)(unit, "LCP down");
}
}
num_np_open = 0;
num_np_up = 0;
num_np_open = 0; /* number of network protocols we have opened */
num_np_up = 0; /* Number of network protocols which have come up */
if (lcp_phase[unit] != PHASE_DEAD) {
lcp_phase[unit] = PHASE_TERMINATE;
}
@@ -253,7 +449,7 @@ link_established(int unit)
lcp_options *ho = &lcp_hisoptions[unit];
#endif /* PAP_SUPPORT || CHAP_SUPPORT */
AUTHDEBUG((LOG_INFO, "link_established: %d\n", unit));
AUTHDEBUG((LOG_INFO, "link_established: unit %d; Lowering up all protocols...\n", unit));
/*
* Tell higher-level protocols that LCP is up.
*/
@@ -274,7 +470,7 @@ link_established(int unit)
return;
}
}
lcp_phase[unit] = PHASE_AUTHENTICATE;
auth = 0;
#if CHAP_SUPPORT
@@ -329,7 +525,7 @@ network_phase(int unit)
int i;
struct protent *protp;
lcp_options *go = &lcp_gotoptions[unit];
/*
* If the peer had to authenticate, run the auth-up script now.
*/
@@ -364,6 +560,7 @@ network_phase(int unit)
lcp_close(0, "No network protocols running");
}
}
/* @todo: add void start_networks(void) here (pppd 2.3.11) */
/*
* The peer has failed to authenticate himself using `protocol'.
@@ -389,7 +586,7 @@ void
auth_peer_success(int unit, u16_t protocol, char *name, int namelen)
{
int pbit;
AUTHDEBUG((LOG_INFO, "auth_peer_success: %d proto=%X\n", unit, protocol));
switch (protocol) {
case PPP_CHAP:
@@ -402,7 +599,7 @@ auth_peer_success(int unit, u16_t protocol, char *name, int namelen)
AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n", protocol));
return;
}
/*
* Save the authenticated name of the peer for later.
*/
@@ -428,7 +625,7 @@ void
auth_withpeer_fail(int unit, u16_t protocol)
{
int errCode = PPPERR_AUTHFAIL;
LWIP_UNUSED_ARG(protocol);
AUTHDEBUG((LOG_INFO, "auth_withpeer_fail: %d proto=%X\n", unit, protocol));
@@ -458,7 +655,7 @@ void
auth_withpeer_success(int unit, u16_t protocol)
{
int pbit;
AUTHDEBUG((LOG_INFO, "auth_withpeer_success: %d proto=%X\n", unit, protocol));
switch (protocol) {
case PPP_CHAP:
@@ -474,7 +671,7 @@ auth_withpeer_success(int unit, u16_t protocol)
AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n", protocol));
pbit = 0;
}
/*
* If there is no more authentication still being done,
* proceed to the network (or callback) phase.
@@ -504,7 +701,7 @@ np_up(int unit, u16_t proto)
if (ppp_settings.idle_time_limit > 0) {
TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit);
}
/*
* Set a timeout to close the connection once the maximum
* connect time has expired.
@@ -624,7 +821,7 @@ auth_check_options(void)
ppp_panic("No auth secret");
}
}
#endif
#endif /* UNUSED */
/*
* auth_reset - called when LCP is starting negotiations to recheck
@@ -736,14 +933,149 @@ check_passwd( int unit, char *auser, int userlen, char *apasswd, int passwdlen,
}
#endif /* PAP_SUPPORT */
#if 0 /* UNUSED */
/*
* This function is needed for PAM.
*/
#ifdef USE_PAM
/* lwip does not support PAM*/
#endif /* USE_PAM */
#endif /* UNUSED */
#if 0 /* UNUSED */
/*
* plogin - Check the user name and password against the system
* password database, and login the user if OK.
*
* returns:
* UPAP_AUTHNAK: Login failed.
* UPAP_AUTHACK: Login succeeded.
* In either case, msg points to an appropriate message.
*/
static int
plogin(char *user, char *passwd, char **msg, int *msglen)
{
LWIP_UNUSED_ARG(user);
LWIP_UNUSED_ARG(passwd);
LWIP_UNUSED_ARG(msg);
LWIP_UNUSED_ARG(msglen);
/* The new lines are here align the file when
* compared against the pppd 2.3.11 code */
/* XXX Fail until we decide that we want to support logins. */
return (UPAP_AUTHNAK);
}
#endif
/*
* plogout - Logout the user.
*/
static void
plogout(void)
{
logged_in = 0;
}
/*
* null_login - Check if a username of "" and a password of "" are
* acceptable, and iff so, set the list of acceptable IP addresses
* and return 1.
*/
static int
null_login(int unit)
{
LWIP_UNUSED_ARG(unit);
/* XXX Fail until we decide that we want to support logins. */
return 0;
}
/*
* get_pap_passwd - get a password for authenticating ourselves with
* our peer using PAP. Returns 1 on success, 0 if no suitable password
* could be found.
*/
static int
get_pap_passwd(int unit, char *user, char *passwd)
{
LWIP_UNUSED_ARG(unit);
/* normally we would reject PAP if no password is provided,
but this causes problems with some providers (like CHT in Taiwan)
who incorrectly request PAP and expect a bogus/empty password, so
always provide a default user/passwd of "none"/"none"
@todo: This should be configured by the user, instead of being hardcoded here!
*/
if(user) {
strcpy(user, "none");
}
if(passwd) {
strcpy(passwd, "none");
}
return 1;
}
/*
* have_pap_secret - check whether we have a PAP file with any
* secrets that we could possibly use for authenticating the peer.
*/
static int
have_pap_secret(void)
{
/* XXX Fail until we set up our passwords. */
return 0;
}
/*
* have_chap_secret - check whether we have a CHAP file with a
* secret that we could possibly use for authenticating `client'
* on `server'. Either can be the null string, meaning we don't
* know the identity yet.
*/
static int
have_chap_secret(char *client, char *server, u32_t remote)
{
LWIP_UNUSED_ARG(client);
LWIP_UNUSED_ARG(server);
LWIP_UNUSED_ARG(remote);
/* XXX Fail until we set up our passwords. */
return 0;
}
#if CHAP_SUPPORT
/*
* get_secret - open the CHAP secret file and return the secret
* for authenticating the given client on the given server.
* (We could be either client or server).
*/
int get_secret( int unit, char *client, char *server, char *secret, int *secret_len, int save_addrs)
int
get_secret(int unit, char *client, char *server, char *secret, int *secret_len, int save_addrs)
{
#if 1
int len;
@@ -801,97 +1133,6 @@ int get_secret( int unit, char *client, char *server, char *secret, int *secret_
}
#endif /* CHAP_SUPPORT */
#if 0
/*
* login - Check the user name and password against the system
* password database, and login the user if OK.
*
* returns:
* UPAP_AUTHNAK: Login failed.
* UPAP_AUTHACK: Login succeeded.
* In either case, msg points to an appropriate message.
*/
static int
login(char *user, char *passwd, char **msg, int *msglen)
{
/* XXX Fail until we decide that we want to support logins. */
return (UPAP_AUTHNAK);
}
#endif
/*
* logout - Logout the user.
*/
static void
logout(void)
{
logged_in = 0;
}
/*
* null_login - Check if a username of "" and a password of "" are
* acceptable, and iff so, set the list of acceptable IP addresses
* and return 1.
*/
static int
null_login(int unit)
{
LWIP_UNUSED_ARG(unit);
/* XXX Fail until we decide that we want to support logins. */
return 0;
}
/*
* get_pap_passwd - get a password for authenticating ourselves with
* our peer using PAP. Returns 1 on success, 0 if no suitable password
* could be found.
*/
static int
get_pap_passwd(int unit, char *user, char *passwd)
{
LWIP_UNUSED_ARG(unit);
/* normally we would reject PAP if no password is provided,
but this causes problems with some providers (like CHT in Taiwan)
who incorrectly request PAP and expect a bogus/empty password, so
always provide a default user/passwd of "none"/"none"
@todo: This should be configured by the user, instead of being hardcoded here!
*/
if(user) {
strcpy(user, "none");
}
if(passwd) {
strcpy(passwd, "none");
}
return 1;
}
/*
* have_pap_secret - check whether we have a PAP file with any
* secrets that we could possibly use for authenticating the peer.
*/
static int
have_pap_secret(void)
{
/* XXX Fail until we set up our passwords. */
return 0;
}
/*
* have_chap_secret - check whether we have a CHAP file with a
* secret that we could possibly use for authenticating `client'
* on `server'. Either can be the null string, meaning we don't
* know the identity yet.
*/
static int
have_chap_secret(char *client, char *server, u32_t remote)
{
LWIP_UNUSED_ARG(client);
LWIP_UNUSED_ARG(server);
LWIP_UNUSED_ARG(remote);
/* XXX Fail until we set up our passwords. */
return 0;
}
#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
/*
@@ -942,7 +1183,7 @@ auth_ip_addr(int unit, u32_t addr)
return ip_addr_check(addr, addresses[unit]);
}
static int
static int /* @todo: integrate this funtion into auth_ip_addr()*/
ip_addr_check(u32_t addr, struct wordlist *addrs)
{
/* don't allow loopback or multicast address */
@@ -971,7 +1212,58 @@ bad_ip_adrs(u32_t addr)
|| IN_MULTICAST(addr) || IN_BADCLASS(addr);
}
#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
#if 0 /* UNUSED */ /* PAP_SUPPORT || CHAP_SUPPORT */
/*
* some_ip_ok - check a wordlist to see if it authorizes any
* IP address(es).
*/
static int
some_ip_ok(struct wordlist *addrs)
{
for (; addrs != 0; addrs = addrs->next) {
if (addrs->word[0] == '-')
break;
if (addrs->word[0] != '!')
return 1; /* some IP address is allowed */
}
return 0;
}
/*
* check_access - complain if a secret file has too-liberal permissions.
*/
static void
check_access(FILE *f, char *filename)
{
struct stat sbuf;
if (fstat(fileno(f), &sbuf) < 0) {
warn("cannot stat secret file %s: %m", filename);
} else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
warn("Warning - secret file %s has world and/or group access",
filename);
}
}
/*
* scan_authfile - Scan an authorization file for a secret suitable
* for authenticating `client' on `server'. The return value is -1
* if no secret is found, otherwise >= 0. The return value has
* NONWILD_CLIENT set if the secret didn't have "*" for the client, and
* NONWILD_SERVER set if the secret didn't have "*" for the server.
* Any following words on the line up to a "--" (i.e. address authorization
* info) are placed in a wordlist and returned in *addrs. Any
* following words (extra options) are placed in a wordlist and
* returned in *opts.
* We assume secret is NULL or points to MAXWORDLEN bytes of space.
*/
static int
scan_authfile(FILE *f, char *client, char *server, char *secret, struct wordlist **addrs, struct wordlist **opts, char *filename)
{
/* We do not (currently) need this in lwip */
return 0; /* dummy */
}
/*
* free_wordlist - release memory allocated for a wordlist.
*/
@@ -979,13 +1271,68 @@ static void
free_wordlist(struct wordlist *wp)
{
struct wordlist *next;
while (wp != NULL) {
next = wp->next;
free(wp);
wp = next;
}
}
#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
/*
* auth_script_done - called when the auth-up or auth-down script
* has finished.
*/
static void
auth_script_done(void *arg)
{
auth_script_pid = 0;
switch (auth_script_state) {
case s_up:
if (auth_state == s_down) {
auth_script_state = s_down;
auth_script(_PATH_AUTHDOWN);
}
break;
case s_down:
if (auth_state == s_up) {
auth_script_state = s_up;
auth_script(_PATH_AUTHUP);
}
break;
}
}
/*
* auth_script - execute a script with arguments
* interface-name peer-name real-user tty speed
*/
static void
auth_script(char *script)
{
char strspeed[32];
struct passwd *pw;
char struid[32];
char *user_name;
char *argv[8];
if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
user_name = pw->pw_name;
else {
slprintf(struid, sizeof(struid), "%d", getuid());
user_name = struid;
}
slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
argv[0] = script;
argv[1] = ifname;
argv[2] = peer_authname;
argv[3] = user_name;
argv[4] = devnam;
argv[5] = strspeed;
argv[6] = NULL;
auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);
}
#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
#endif /* PPP_SUPPORT */