ports/libssh
ports/libssh
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big changes :

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Some documentation, and a new logging system.
some work must be done to get rid of the infamous ssh_say()


git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@166 7dcaeef0-15fb-0310-b436-a5af3365683c
Этот коммит содержится в:
Aris Adamantiadis 2008-06-12 20:14:17 +00:00
родитель b94422ef10
Коммит fe51f9c766
17 изменённых файлов: 654 добавлений и 173 удалений
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2
Doxyfile
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@ -31,7 +31,7 @@ PROJECT_NAME = libssh
# This could be handy for archiving the generated documentation or
# if some version control system is used.
PROJECT_NUMBER = 0.2
PROJECT_NUMBER = 0.2-svn
# The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
# base path where the generated documentation will be put.

18
include/libssh/libssh.h
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@ -33,6 +33,7 @@ typedef unsigned long long uint64_t;
#endif
#ifndef _WIN32
#include <sys/select.h> /* for fd_set * */
#include <netdb.h>
#endif
#ifdef _WIN32
#include <winsock2.h>
@ -123,11 +124,15 @@ void ssh_say(int priority,char *format,...);
void ssh_set_verbosity(int num);
/* There is a verbosity level */
/* 3 : packet level */
/* 2 : protocol level */
/* 1 : functions level */
/* 0 : important messages only */
/* -1 : no messages */
#define SSH_LOG_NOLOG 0 // no log
#define SSH_LOG_RARE 1 // rare conditions
#define SSH_LOG_ENTRY 2 // user-accessible entrypoints
#define SSH_LOG_PACKET 3 // packet id and size
#define SSH_LOG_FUNCTIONS 4 // every function in and return
/* log.c */
void ssh_log(SSH_SESSION *session, int prioriry, char *format, ...);
/* session.c */
SSH_SESSION *ssh_new();
@ -240,6 +245,9 @@ void ssh_options_allow_ssh1(SSH_OPTIONS *opt, int allow);
void ssh_options_allow_ssh2(SSH_OPTIONS *opt, int allow);
void ssh_options_set_dsa_server_key(SSH_OPTIONS *opt, char *dsakey);
void ssh_options_set_rsa_server_key(SSH_OPTIONS *opt, char *rsakey);
void ssh_options_set_log_function(SSH_OPTIONS *opt,
void (*callback)(const char *message, SSH_SESSION *session, int verbosity ));
void ssh_options_set_log_verbosity(SSH_OPTIONS *opt, int verbosity);
/* buffer.c */

25
include/libssh/priv.h
Просмотреть файл

@ -237,6 +237,8 @@ struct ssh_options_struct {
int ssh1allowed;
char *dsakey;
char *rsakey; /* host key for server implementation */
int log_verbosity;
void (*log_function)(const char *message, SSH_SESSION *session, int verbosity); //log callback
};
typedef struct ssh_crypto_struct {
@ -355,6 +357,8 @@ struct ssh_session {
int auth_methods;
int hostkeys; /* contains type of host key wanted by client, in server impl */
struct ssh_message *ssh_message; /* ssh message */
int log_verbosity; /*cached copy of the option structure */
int log_indent; /* indentation level in enter_function logs */
};
struct ssh_kbdint {
@ -612,6 +616,27 @@ int channel_write1(CHANNEL *channel, void *data, int len);
int ssh_handle_packets(SSH_SESSION *session);
/* log.c */
#define _enter_function(sess) \
do {\
if((sess)->log_verbosity >= SSH_LOG_FUNCTIONS){ \
ssh_log((sess),SSH_LOG_FUNCTIONS,"entering function %s line %d in " __FILE__ , __FUNCTION__,__LINE__);\
(sess)->log_indent++; \
} \
} while(0)
#define _leave_function(sess) \
do { \
if((sess)->log_verbosity >= SSH_LOG_FUNCTIONS){ \
(sess)->log_indent--; \
ssh_log((sess),SSH_LOG_FUNCTIONS,"leaving function %s line %d in " __FILE__ , __FUNCTION__,__LINE__);\
}\
} while(0)
#define enter_function() _enter_function(session)
#define leave_function() _leave_function(session)
#ifdef HAVE_LIBGCRYPT
/* gcrypt_missing.c */
int my_gcry_dec2bn(bignum *bn, const char *data);

2
libssh/Makefile.am
Просмотреть файл

@ -7,7 +7,7 @@ libssh_la_SOURCES = auth1.c auth.c base64.c buffer.c \
keys.c messages.c misc.c options.c \
packet.c server.c session.c sftp.c \
sftpserver.c string.c wrapper.c \
socket.c
socket.c log.c
libssh_la_CPPFLAGS = -I$(top_srcdir)/include

171
libssh/auth.c
Просмотреть файл

@ -32,16 +32,16 @@ MA 02111-1307, USA. */
* @{ */
static int ask_userauth(SSH_SESSION *session){
int ret=0;
enter_function();
if(session->auth_service_asked)
return 0;
else {
if(ssh_service_request(session,"ssh-userauth"))
return -1;
else
session->auth_service_asked++;
}
return 0;
ret = 0;
else if(ssh_service_request(session,"ssh-userauth"))
ret = -1;
else
session->auth_service_asked++;
leave_function();
return ret;
}
static void burn(char *ptr){
@ -55,6 +55,7 @@ static int wait_auth_status(SSH_SESSION *session,int kbdint){
STRING *can_continue;
u8 partial=0;
char *c_cont;
enter_function();
while(cont){
if(packet_read(session))
break;
@ -66,6 +67,7 @@ static int wait_auth_status(SSH_SESSION *session,int kbdint){
if(!can_continue || buffer_get_u8(session->in_buffer,&partial)!=1 ){
ssh_set_error(session,SSH_FATAL,
"invalid SSH_MSG_USERAUTH_FAILURE message");
leave_function();
return SSH_AUTH_ERROR;
}
c_cont=string_to_char(can_continue);
@ -114,6 +116,7 @@ static int wait_auth_status(SSH_SESSION *session,int kbdint){
break;
}
}
leave_function();
return err;
}
@ -133,19 +136,27 @@ int ssh_userauth_none(SSH_SESSION *session,char *username){
STRING *user;
STRING *service;
STRING *method;
int ret;
enter_function();
#ifdef HAVE_SSH1
if(session->version==1)
return ssh_userauth1_none(session,username);
if(session->version==1){
ret = ssh_userauth1_none(session,username);
leave_function();
return ret;
}
#endif
if(!username)
if(!(username=session->options->username)){
if(ssh_options_default_username(session->options))
return SSH_AUTH_ERROR;
else
if(ssh_options_default_username(session->options)){
leave_function();
return SSH_AUTH_ERROR;
} else
username=session->options->username;
}
if(ask_userauth(session))
return SSH_AUTH_ERROR;
if(ask_userauth(session)){
leave_function();
return SSH_AUTH_ERROR;
}
user=string_from_char(username);
method=string_from_char("none");
service=string_from_char("ssh-connection");
@ -158,7 +169,9 @@ int ssh_userauth_none(SSH_SESSION *session,char *username){
free(method);
free(user);
packet_send(session);
return wait_auth_status(session,0);
ret = wait_auth_status(session,0);
leave_function();
return ret;
}
/** \brief Try to authenticate through public key
@ -182,19 +195,26 @@ int ssh_userauth_offer_pubkey(SSH_SESSION *session, char *username,int type, STR
STRING *method;
STRING *algo;
int err=SSH_AUTH_ERROR;
enter_function();
#ifdef HAVE_SSH1
if(session->version==1)
return ssh_userauth1_offer_pubkey(session,username,type,publickey);
if(session->version==1){
err= ssh_userauth1_offer_pubkey(session,username,type,publickey);
leave_function();
return err;
}
#endif
if(!username)
if(!(username=session->options->username)){
if(ssh_options_default_username(session->options))
return SSH_AUTH_ERROR;
else
if(ssh_options_default_username(session->options)){
leave_function();
return SSH_AUTH_ERROR;
} else
username=session->options->username;
}
if(ask_userauth(session))
return SSH_AUTH_ERROR;
if(ask_userauth(session)){
leave_function();
return SSH_AUTH_ERROR;
}
user=string_from_char(username);
service=string_from_char("ssh-connection");
method=string_from_char("publickey");
@ -214,6 +234,7 @@ int ssh_userauth_offer_pubkey(SSH_SESSION *session, char *username,int type, STR
free(method);
free(service);
free(algo);
leave_function();
return err;
}
@ -241,17 +262,21 @@ int ssh_userauth_pubkey(SSH_SESSION *session, char *username, STRING *publickey,
STRING *algo;
STRING *sign;
int err=SSH_AUTH_ERROR;
enter_function();
// if(session->version==1)
// return ssh_userauth1_pubkey(session,username,publickey,privatekey);
if(!username)
if(!(username=session->options->username)){
if(ssh_options_default_username(session->options))
return err;
else
if(ssh_options_default_username(session->options)){
leave_function();
return err;
} else
username=session->options->username;
}
if(ask_userauth(session))
return err;
if(ask_userauth(session)){
leave_function();
return err;
}
user=string_from_char(username);
service=string_from_char("ssh-connection");
method=string_from_char("publickey");
@ -278,6 +303,7 @@ int ssh_userauth_pubkey(SSH_SESSION *session, char *username, STRING *publickey,
free(service);
free(method);
free(algo);
leave_function();
return err;
}
@ -300,19 +326,27 @@ int ssh_userauth_password(SSH_SESSION *session,char *username,char *password){
STRING *method;
STRING *password_s;
int err;
enter_function();
#ifdef HAVE_SSH1
if(session->version==1)
return ssh_userauth1_password(session,username,password);
if(session->version==1){
err = ssh_userauth1_password(session,username,password);
leave_function();
return err;
}
#endif
if(!username)
if(!(username=session->options->username)){
if(ssh_options_default_username(session->options))
return SSH_AUTH_ERROR;
else
if(ssh_options_default_username(session->options)){
err = SSH_AUTH_ERROR;
leave_function();
return err;
} else
username=session->options->username;
}
if(ask_userauth(session))
return SSH_AUTH_ERROR;
if(ask_userauth(session)){
leave_function();
return SSH_AUTH_ERROR;
}
user=string_from_char(username);
service=string_from_char("ssh-connection");
method=string_from_char("password");
@ -332,6 +366,7 @@ int ssh_userauth_password(SSH_SESSION *session,char *username,char *password){
free(password_s);
packet_send(session);
err=wait_auth_status(session,0);
leave_function();
return err;
}
@ -362,9 +397,11 @@ int ssh_userauth_autopubkey(SSH_SESSION *session){
char *privkeyfile=NULL;
PRIVATE_KEY *privkey;
char *id=NULL;
enter_function();
// always testing none
err=ssh_userauth_none(session,NULL);
if(err==SSH_AUTH_ERROR || err==SSH_AUTH_SUCCESS){
leave_function();
return err;
}
if(session->options->identity){
@ -386,6 +423,7 @@ int ssh_userauth_autopubkey(SSH_SESSION *session){
}
free(pubkey);
free(privkeyfile);
leave_function();
return err;
} else
if(err != SSH_AUTH_SUCCESS){
@ -416,6 +454,7 @@ int ssh_userauth_autopubkey(SSH_SESSION *session){
free(pubkey);
free(privkeyfile);
private_key_free(privkey);
leave_function();
return err;
} else
if(err != SSH_AUTH_SUCCESS){
@ -437,6 +476,7 @@ int ssh_userauth_autopubkey(SSH_SESSION *session){
keys_path[0]=NULL;
free(id);
}
leave_function();
return SSH_AUTH_SUCCESS;
}
/* at this point, pubkey is NULL and so is privkeyfile */
@ -447,7 +487,7 @@ int ssh_userauth_autopubkey(SSH_SESSION *session){
keys_path[0]=NULL;
free(id);
}
leave_function();
return SSH_AUTH_DENIED;
}
@ -525,6 +565,8 @@ static int kbdauth_init(SSH_SESSION *session,
STRING *submethods_s=(submethods ? string_from_char(submethods): string_from_char(""));
STRING *service=string_from_char("ssh-connection");
STRING *method=string_from_char("keyboard-interactive");
int err;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_USERAUTH_REQUEST);
buffer_add_ssh_string(session->out_buffer,user_s);
@ -536,9 +578,13 @@ static int kbdauth_init(SSH_SESSION *session,
free(service);
free(method);
free(submethods_s);
if(packet_send(session))
return SSH_AUTH_ERROR;
return wait_auth_status(session,1);
if(packet_send(session)){
leave_function();
return SSH_AUTH_ERROR;
}
err=wait_auth_status(session,1);
leave_function();
return err;
}
static int kbdauth_info_get(SSH_SESSION *session){
@ -547,6 +593,7 @@ static int kbdauth_info_get(SSH_SESSION *session){
STRING *tmp;
u32 nprompts;
int i;
enter_function();
name=buffer_get_ssh_string(session->in_buffer);
instruction=buffer_get_ssh_string(session->in_buffer);
tmp=buffer_get_ssh_string(session->in_buffer);
@ -558,6 +605,7 @@ static int kbdauth_info_get(SSH_SESSION *session){
free(instruction);
// tmp must be empty if we got here
ssh_set_error(session,SSH_FATAL,"Invalid USERAUTH_INFO_REQUEST msg");
leave_function();
return SSH_AUTH_ERROR;
}
if(tmp)
@ -573,6 +621,7 @@ static int kbdauth_info_get(SSH_SESSION *session){
nprompts=ntohl(nprompts);
if(nprompts>KBDINT_MAX_PROMPT){
ssh_set_error(session,SSH_FATAL,"Too much prompt asked from server: %lu(0x%.8lx)",nprompts,nprompts);
leave_function();
return SSH_AUTH_ERROR;
}
session->kbdint->nprompts=nprompts;
@ -585,11 +634,13 @@ static int kbdauth_info_get(SSH_SESSION *session){
buffer_get_u8(session->in_buffer,&session->kbdint->echo[i]);
if(!tmp){
ssh_set_error(session,SSH_FATAL,"Short INFO_REQUEST packet");
leave_function();
return SSH_AUTH_ERROR;
}
session->kbdint->prompts[i]=string_to_char(tmp);
free(tmp);
}
leave_function();
return SSH_AUTH_INFO; /* we are not auth. but we parsed the packet */
}
@ -597,6 +648,8 @@ static int kbdauth_info_get(SSH_SESSION *session){
static int kbdauth_send(SSH_SESSION *session) {
STRING *answer;
int i;
int err;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_USERAUTH_INFO_RESPONSE);
buffer_add_u32(session->out_buffer,htonl(session->kbdint->nprompts));
@ -609,9 +662,13 @@ static int kbdauth_send(SSH_SESSION *session) {
string_burn(answer);
free(answer);
}
if(packet_send(session))
return SSH_AUTH_ERROR;
return wait_auth_status(session,1);
if(packet_send(session)){
leave_function();
return SSH_AUTH_ERROR;
}
err = wait_auth_status(session,1);
leave_function();
return err;
}
/** \brief Try to authenticate through the "keyboard-interactive" method
@ -637,25 +694,32 @@ int ssh_userauth_kbdint(SSH_SESSION *session,char *user,char *submethods){
int err;
if(session->version==1)
return SSH_AUTH_DENIED; // no keyb-interactive for ssh1
enter_function();
if( !session->kbdint){
/* first time we call. we must ask for a challenge */
if(!user)
if(!(user=session->options->username)){
if(ssh_options_default_username(session->options))
return SSH_AUTH_ERROR;
else
if(ssh_options_default_username(session->options)){
leave_function();
return SSH_AUTH_ERROR;
} else
user=session->options->username;
}
if(ask_userauth(session))
return SSH_AUTH_ERROR;
if(ask_userauth(session)){
leave_function();
return SSH_AUTH_ERROR;
}
err=kbdauth_init(session,user,submethods);
if(err!=SSH_AUTH_INFO)
return err; /* error or first try success */
if(err!=SSH_AUTH_INFO){
leave_function();
return err; /* error or first try success */
}
err=kbdauth_info_get(session);
if(err==SSH_AUTH_ERROR){
kbdint_free(session->kbdint);
session->kbdint=NULL;
}
leave_function();
return err;
}
/* if we are at this point, it's because session->kbdint exists */
@ -665,13 +729,16 @@ int ssh_userauth_kbdint(SSH_SESSION *session,char *user,char *submethods){
err=kbdauth_send(session);
kbdint_free(session->kbdint);
session->kbdint=NULL;
if(err!=SSH_AUTH_INFO)
return err;
if(err!=SSH_AUTH_INFO){
leave_function();
return err;
}
err=kbdauth_info_get(session);
if(err==SSH_AUTH_ERROR){
kbdint_free(session->kbdint);
session->kbdint=NULL;
}
leave_function();
return err;
}

115
libssh/channels.c
Просмотреть файл

@ -71,6 +71,7 @@ static int channel_open(CHANNEL *channel,char *type_c,int window,
STRING *type=string_from_char(type_c);
u32 foo;
int err;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_OPEN);
channel->local_channel=ssh_channel_new_id(session);
@ -94,6 +95,7 @@ static int channel_open(CHANNEL *channel,char *type_c,int window,
if(channel->local_channel!=ntohl(foo)){
ssh_set_error(session,SSH_FATAL,"server answered with sender chan num %d instead of given %d",
ntohl(foo),channel->local_channel);
leave_function();
return -1;
}
buffer_get_u32(session->in_buffer,&foo);
@ -107,6 +109,7 @@ static int channel_open(CHANNEL *channel,char *type_c,int window,
ssh_say(3,"Remote window : %ld, maxpacket : %ld\n",
channel->remote_window, channel->remote_maxpacket);
channel->open=1;
leave_function();
return 0;
case SSH2_MSG_CHANNEL_OPEN_FAILURE:
{
@ -121,12 +124,15 @@ static int channel_open(CHANNEL *channel,char *type_c,int window,
channel->local_channel,ntohl(code),error);
free(error);
free(error_s);
leave_function();
return -1;
}
default:
ssh_set_error(session,SSH_FATAL,"Received unknown packet %d\n",session->in_packet.type);
leave_function();
return -1;
}
leave_function();
return -1;
}
@ -145,6 +151,7 @@ CHANNEL *ssh_channel_from_local(SSH_SESSION *session,u32 num){
static void grow_window(SSH_SESSION *session, CHANNEL *channel){
u32 new_window=WINDOWBASE;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_WINDOW_ADJUST);
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
@ -154,6 +161,7 @@ static void grow_window(SSH_SESSION *session, CHANNEL *channel){
channel->local_channel,channel->remote_channel,
channel->local_window + new_window);
channel->local_window+=new_window;
leave_function();
}
static CHANNEL *channel_from_msg(SSH_SESSION *session){
@ -173,27 +181,32 @@ static void channel_rcv_change_window(SSH_SESSION *session){
u32 bytes;
CHANNEL *channel;
int err;
enter_function();
channel=channel_from_msg(session);
if(!channel)
ssh_say(0,"%s\n",ssh_get_error(session));
err = buffer_get_u32(session->in_buffer,&bytes);
if(!channel || err!= sizeof(u32)){
ssh_say(1,"Error getting a window adjust message : invalid packet\n");
leave_function();
return;
}
bytes=ntohl(bytes);
ssh_say(3,"Adding %d bytes to channel (%d:%d) (from %d bytes)\n",bytes,
channel->local_channel,channel->remote_channel,channel->remote_window);
channel->remote_window+=bytes;
leave_function();
}
/* is_stderr is set to 1 if the data are extended, ie stderr */
static void channel_rcv_data(SSH_SESSION *session,int is_stderr){
STRING *str;
CHANNEL *channel;
enter_function();
channel=channel_from_msg(session);
if(!channel){
ssh_say(0,"%s",ssh_get_error(session));
leave_function();
return;
}
if(is_stderr){
@ -205,6 +218,7 @@ static void channel_rcv_data(SSH_SESSION *session,int is_stderr){
if(!str){
ssh_say(0,"Invalid data packet !\n");
leave_function();
return;
}
ssh_say(3,"adding %d bytes data in %d\n",string_len(str),is_stderr);
@ -219,26 +233,32 @@ static void channel_rcv_data(SSH_SESSION *session,int is_stderr){
if(channel->local_window < WINDOWLIMIT)
grow_window(session,channel); /* i wonder if this is the correct place to do that */
free(str);
leave_function();
}
static void channel_rcv_eof(SSH_SESSION *session){
CHANNEL *channel;
enter_function();
channel=channel_from_msg(session);
if(!channel){
ssh_say(0,"%s\n",ssh_get_error(session));
leave_function();
return;
}
ssh_say(2,"Received eof on channel (%d:%d)\n",channel->local_channel,
channel->remote_channel);
// channel->remote_window=0;
channel->remote_eof=1;
leave_function();
}
static void channel_rcv_close(SSH_SESSION *session){
CHANNEL *channel;
enter_function();
channel=channel_from_msg(session);
if(!channel){
ssh_say(0,"%s\n",ssh_get_error(session));
leave_function();
return;
}
ssh_say(2,"Received close on channel (%d:%d)\n",channel->local_channel,
@ -253,6 +273,7 @@ static void channel_rcv_close(SSH_SESSION *session){
channel->remote_eof=1;
/* the remote eof doesn't break things if there was still data into read
* buffer because the eof is ignored until the buffer is empty. */
leave_function();
}
static void channel_rcv_request(SSH_SESSION *session){
@ -260,13 +281,16 @@ static void channel_rcv_request(SSH_SESSION *session){
char *request;
u32 status;
CHANNEL *channel=channel_from_msg(session);
enter_function();
if(!channel){
ssh_say(1,"%s\n",ssh_get_error(session));
leave_function();
return;
}
request_s=buffer_get_ssh_string(session->in_buffer);
if(!request_s){
ssh_say(0,"Invalid MSG_CHANNEL_REQUEST\n");
leave_function();
return;
}
buffer_get_u8(session->in_buffer,(u8 *)&status);
@ -274,9 +298,10 @@ static void channel_rcv_request(SSH_SESSION *session){
if(!strcmp(request,"exit-status")){
buffer_get_u32(session->in_buffer,&status);
status=ntohl(status);
/* XXX do something with status, we might need it */
/* TODO do something with status, we might need it */
free(request_s);
free(request);
leave_function();
return ;
}
if(!strcmp(request,"exit-signal")){
@ -289,6 +314,7 @@ static void channel_rcv_request(SSH_SESSION *session){
ssh_say(0,"Invalid MSG_CHANNEL_REQUEST\n");
free(request_s);
free(request);
leave_function();
return;
}
signal=string_to_char(signal_s);
@ -300,15 +326,18 @@ static void channel_rcv_request(SSH_SESSION *session){
free(signal);
free(request_s);
free(request);
leave_function();
return;
}
ssh_say(0,"Unknown request %s\n",request);
free(request_s);
free(request);
leave_function();
}
/* channel_handle is called by wait_packet, ie, when there is channel informations to handle . */
void channel_handle(SSH_SESSION *session, int type){
enter_function();
ssh_say(3,"Channel_handle(%d)\n",type);
switch(type){
case SSH2_MSG_CHANNEL_WINDOW_ADJUST:
@ -332,6 +361,7 @@ void channel_handle(SSH_SESSION *session, int type){
default:
ssh_say(0,"Unexpected message %d\n",type);
}
leave_function();
}
/* when data has been received from the ssh server, it can be applied to the known
@ -386,7 +416,9 @@ int channel_open_session(CHANNEL *channel){
int channel_open_forward(CHANNEL *channel,char *remotehost, int remoteport, char *sourcehost, int localport){
BUFFER *payload=buffer_new();
STRING *str=string_from_char(remotehost);
SSH_SESSION *session=channel->session;
int ret;
enter_function();
buffer_add_ssh_string(payload,str);
free(str);
str=string_from_char(sourcehost);
@ -396,6 +428,7 @@ int channel_open_forward(CHANNEL *channel,char *remotehost, int remoteport, char
buffer_add_u32(payload,htonl(localport));
ret=channel_open(channel,"direct-tcpip",64000,32000,payload);
buffer_free(payload);
leave_function();
return ret;
}
@ -405,6 +438,7 @@ int channel_open_forward(CHANNEL *channel,char *remotehost, int remoteport, char
*/
void channel_free(CHANNEL *channel){
SSH_SESSION *session=channel->session;
enter_function();
if(session->alive && channel->open)
channel_close(channel);
/* handle the "my channel is first on session list" case */
@ -424,6 +458,7 @@ void channel_free(CHANNEL *channel){
/* debug trick to catch use after frees */
memset(channel,'X',sizeof(CHANNEL));
free(channel);
leave_function();
}
/** it doesn't close the channel. You may still read from it but not write.
@ -437,6 +472,7 @@ void channel_free(CHANNEL *channel){
int channel_send_eof(CHANNEL *channel){
SSH_SESSION *session=channel->session;
int ret;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_EOF);
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
@ -444,6 +480,7 @@ int channel_send_eof(CHANNEL *channel){
ssh_say(1,"Sent a EOF on client channel (%d:%d)\n",channel->local_channel,
channel->remote_channel);
channel->local_eof=1;
leave_function();
return ret;
}
@ -459,10 +496,13 @@ int channel_send_eof(CHANNEL *channel){
int channel_close(CHANNEL *channel){
SSH_SESSION *session=channel->session;
int ret=0;
enter_function();
if(!channel->local_eof)
ret=channel_send_eof(channel);
if(ret)
return ret;
if(ret){
leave_function();
return ret;
}
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_CLOSE);
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
@ -471,6 +511,7 @@ int channel_close(CHANNEL *channel){
channel->remote_channel);
if(!ret)
channel->open =0;
leave_function();
return ret;
}
@ -486,18 +527,23 @@ int channel_write(CHANNEL *channel ,void *data,int len){
SSH_SESSION *session=channel->session;
int effectivelen;
int origlen=len;
enter_function();
if(channel->local_eof){
ssh_set_error(session,SSH_REQUEST_DENIED,"Can't write to channel %d:%d"
" after EOF was sent",channel->local_channel,channel->remote_channel);
leave_function();
return -1;
}
if(!channel->open || channel->delayed_close){
ssh_set_error(session,SSH_REQUEST_DENIED,"Remote channel is closed");
leave_function();
return -1;
}
#ifdef HAVE_SSH1
if(channel->version==1)
return channel_write1(channel,data,len);
if(channel->version==1){
err = channel_write1(channel,data,len);
leave_function();
return err;
#endif
while(len >0){
if(channel->remote_window<len){
@ -523,6 +569,7 @@ int channel_write(CHANNEL *channel ,void *data,int len){
len -= effectivelen;
data+=effectivelen;
}
leave_function();
return origlen;
}
@ -571,6 +618,7 @@ static int channel_request(CHANNEL *channel,char *request, BUFFER *buffer,int re
STRING *request_s=string_from_char(request);
SSH_SESSION *session=channel->session;
int err;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_REQUEST);
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
@ -581,8 +629,10 @@ static int channel_request(CHANNEL *channel,char *request, BUFFER *buffer,int re
packet_send(session);
ssh_say(3,"Sent a SSH_MSG_CHANNEL_REQUEST %s\n",request);
free(request_s);
if(!reply)
return 0;
if(!reply){
leave_function();
return 0;
}
err=packet_wait(session,SSH2_MSG_CHANNEL_SUCCESS,1);
if(err)
if(session->in_packet.type==SSH2_MSG_CHANNEL_FAILURE){
@ -593,6 +643,7 @@ static int channel_request(CHANNEL *channel,char *request, BUFFER *buffer,int re
ssh_say(3,"Received an unexpected %d message\n",session->in_packet.type);
else
ssh_say(3,"Received a SUCCESS\n");
leave_function();
return err;
}
@ -607,10 +658,15 @@ static int channel_request(CHANNEL *channel,char *request, BUFFER *buffer,int re
int channel_request_pty_size(CHANNEL *channel, char *terminal, int col, int row){
STRING *term;
BUFFER *buffer;
SSH_SESSION *session=channel->session;
int err;
enter_function();
#ifdef HAVE_SSH1
if(channel->version==1)
return channel_request_pty_size1(channel,terminal, col, row);
if(channel->version==1){
err = channel_request_pty_size1(channel,terminal, col, row);
leave_function();
return err;
}
#endif
term=string_from_char(terminal);
buffer=buffer_new();
@ -625,6 +681,7 @@ int channel_request_pty_size(CHANNEL *channel, char *terminal, int col, int row)
free(term);
err=channel_request(channel,"pty-req",buffer,1);
buffer_free(buffer);
leave_function();
return err;
}
@ -649,9 +706,14 @@ int channel_request_pty(CHANNEL *channel){
int channel_change_pty_size(CHANNEL *channel,int cols,int rows){
BUFFER *buffer;
int err;
SSH_SESSION *session=channel->session;
enter_function();
#ifdef HAVE_SSH1
if(channel->version==1)
return channel_change_pty_size1(channel,cols,rows);
if(channel->version==1){
err = channel_change_pty_size1(channel,cols,rows);
leave_function();
return err;
}
#endif
buffer=buffer_new();
//buffer_add_u8(buffer,0);
@ -661,6 +723,7 @@ int channel_change_pty_size(CHANNEL *channel,int cols,int rows){
buffer_add_u32(buffer,0);
err=channel_request(channel,"window-change",buffer,0);
buffer_free(buffer);
leave_function();
return err;
}
@ -764,9 +827,11 @@ int channel_request_exec(CHANNEL *channel, char *cmd){
*/
int channel_read(CHANNEL *channel, BUFFER *buffer,int bytes,int is_stderr){
BUFFER *stdbuf=NULL;
SSH_SESSION *session=channel->session;
int len;
buffer_reinit(buffer);
int maxread=bytes;
enter_function();
if(bytes==0)
maxread=MAX_PACKET_LEN;
/* maybe i should always set a buffer to avoid races between channel_default_bufferize and channel_read */
@ -777,15 +842,19 @@ int channel_read(CHANNEL *channel, BUFFER *buffer,int bytes,int is_stderr){
/* block reading if asked bytes=0 */
while((buffer_get_rest_len(stdbuf)==0) || (buffer_get_rest_len(stdbuf) < bytes)){
if(channel->remote_eof && buffer_get_rest_len(stdbuf)==0)
return 0;
if(channel->remote_eof && buffer_get_rest_len(stdbuf)==0){
leave_function();
return 0;
}
if(channel->remote_eof)
break; /* return the resting bytes in buffer */
if(buffer_get_rest_len(stdbuf)>=maxread) // stop reading when buffer is full enough
break;
if(packet_read(channel->session)||packet_translate(channel->session))
return -1;
packet_parse(channel->session);
if(packet_read(session)||packet_translate(session)){
leave_function();
return -1;
}
packet_parse(session);
}
if(bytes==0){
@ -798,6 +867,7 @@ int channel_read(CHANNEL *channel, BUFFER *buffer,int bytes,int is_stderr){
buffer_add_data(buffer,buffer_get_rest(stdbuf),len);
buffer_pass_bytes(stdbuf,len);
}
leave_function();
return buffer_get_len(buffer);
}
@ -812,7 +882,9 @@ int channel_read(CHANNEL *channel, BUFFER *buffer,int bytes,int is_stderr){
*/
int channel_poll(CHANNEL *channel, int is_stderr){
BUFFER *buffer;
SSH_SESSION *session=channel->session;
int r=0;
enter_function();
if(is_stderr)
buffer=channel->stderr_buffer;
else
@ -823,8 +895,11 @@ int channel_poll(CHANNEL *channel, int is_stderr){
if(r<=0)
break;
}
if(channel->remote_eof)
return 1;
if(channel->remote_eof){
leave_function();
return 1;
}
leave_function();
return buffer_get_rest_len(buffer);
}
@ -845,11 +920,14 @@ int channel_poll(CHANNEL *channel, int is_stderr){
* \see channel_is_eof()
*/
int channel_read_nonblocking(CHANNEL *channel, char *dest, int len, int is_stderr){
SSH_SESSION *session=channel->session;
enter_function();
int to_read=channel_poll(channel,is_stderr);
int lu;
BUFFER *buffer=buffer_new();
if(to_read<=0){
buffer_free(buffer);
leave_function();
return to_read; /* may be an error code */
}
if(to_read>len)
@ -857,6 +935,7 @@ int channel_read_nonblocking(CHANNEL *channel, char *dest, int len, int is_stder
lu=channel_read(channel,buffer,to_read,is_stderr);
memcpy(dest,buffer_get(buffer),lu>=0?lu:0);
buffer_free(buffer);
leave_function();
return lu;
}

73
libssh/client.c
Просмотреть файл

@ -34,20 +34,26 @@ MA 02111-1307, USA. */
char *ssh_get_banner(SSH_SESSION *session){
char buffer[128];
int i = 0;
char *ret;
enter_function();
while (i < 127) {
if(!ssh_socket_is_open(session->socket) || ssh_socket_read(session->socket, &buffer[i], 1)<=0){
ssh_set_error(session,SSH_FATAL,"Remote host closed connection");
leave_function();
return NULL;
}
if (buffer[i] == '\r')
buffer[i] = 0;
if (buffer[i] == '\n') {
buffer[i] = 0;
return strdup(buffer);
ret= strdup(buffer);
leave_function();
return ret;
}
i++;
}
ssh_set_error(session,SSH_FATAL,"Too large banner");
leave_function();
return NULL;
}
@ -89,6 +95,7 @@ int ssh_analyze_banner(SSH_SESSION *session, int *ssh1, int *ssh2){
int ssh_send_banner(SSH_SESSION *session,int server){
char *banner;
char buffer[128];
enter_function();
banner=session->version==1?CLIENTBANNER1:CLIENTBANNER2;
if(session->options->banner)
banner=session->options->banner;
@ -98,6 +105,7 @@ int ssh_send_banner(SSH_SESSION *session,int server){
session->clientbanner=strdup(banner);
snprintf(buffer,128,"%s\r\n",banner);
ssh_socket_write(session->socket,buffer,strlen(buffer));
leave_function();
return 0;
}
@ -110,6 +118,7 @@ int ssh_send_banner(SSH_SESSION *session,int server){
static int dh_handshake(SSH_SESSION *session){
STRING *e,*f,*pubkey,*signature;
int ret;
enter_function();
switch(session->dh_handshake_state){
case DH_STATE_INIT:
packet_clear_out(session);
@ -121,32 +130,41 @@ static int dh_handshake(SSH_SESSION *session){
ret=packet_send(session);
free(e);
session->dh_handshake_state=DH_STATE_INIT_TO_SEND;
if(ret==SSH_ERROR)
if(ret==SSH_ERROR){
leave_function();
return ret;
}
case DH_STATE_INIT_TO_SEND:
ret=packet_flush(session,0);
if(ret!=SSH_OK)
return ret; // SSH_ERROR or SSH_AGAIN
if(ret!=SSH_OK){
leave_function();
return ret; // SSH_ERROR or SSH_AGAIN
}
session->dh_handshake_state=DH_STATE_INIT_SENT;
case DH_STATE_INIT_SENT:
ret=packet_wait(session,SSH2_MSG_KEXDH_REPLY,1);
if(ret != SSH_OK)
return ret;
if(ret != SSH_OK){
leave_function();
return ret;
}
pubkey=buffer_get_ssh_string(session->in_buffer);
if(!pubkey){
ssh_set_error(session,SSH_FATAL,"No public key in packet");
leave_function();
return SSH_ERROR;
}
dh_import_pubkey(session,pubkey);
f=buffer_get_ssh_string(session->in_buffer);
if(!f){
ssh_set_error(session,SSH_FATAL,"No F number in packet");
leave_function();
return SSH_ERROR;
}
dh_import_f(session,f);
free(f);
if(!(signature=buffer_get_ssh_string(session->in_buffer))){
ssh_set_error(session,SSH_FATAL,"No signature in packet");
leave_function();
return SSH_ERROR;
}
session->dh_server_signature=signature;
@ -158,26 +176,33 @@ static int dh_handshake(SSH_SESSION *session){
session->dh_handshake_state=DH_STATE_NEWKEYS_TO_SEND;
case DH_STATE_NEWKEYS_TO_SEND:
ret=packet_flush(session,0);
if(ret != SSH_OK)
return ret;
if(ret != SSH_OK){
leave_function();
return ret;
}
ssh_say(2,"SSH_MSG_NEWKEYS sent\n");
session->dh_handshake_state=DH_STATE_NEWKEYS_SENT;
case DH_STATE_NEWKEYS_SENT:
ret=packet_wait(session,SSH2_MSG_NEWKEYS,1);
if(ret != SSH_OK)
return ret;
if(ret != SSH_OK){
leave_function();
return ret;
}
ssh_say(2,"Got SSH_MSG_NEWKEYS\n");
make_sessionid(session);
/* set the cryptographic functions for the next crypto */
/* (it is needed for generate_session_keys for key lenghts) */
if(crypt_set_algorithms(session))
return SSH_ERROR;
if(crypt_set_algorithms(session)){
leave_function();
return SSH_ERROR;
}
generate_session_keys(session);
/* verify the host's signature. XXX do it sooner */
signature=session->dh_server_signature;
session->dh_server_signature=NULL;
if(signature_verify(session,signature)){
free(signature);
leave_function();
return SSH_ERROR;
}
free(signature); /* forget it for now ... */
@ -188,17 +213,21 @@ static int dh_handshake(SSH_SESSION *session){
session->current_crypto=session->next_crypto;
session->next_crypto=crypto_new();
session->dh_handshake_state=DH_STATE_FINISHED;
leave_function();
return SSH_OK;
default:
ssh_set_error(session,SSH_FATAL,"Invalid state in dh_handshake():%d",session->dh_handshake_state);
leave_function();
return SSH_ERROR;
}
/* not reached */
leave_function();
return SSH_ERROR;
}
int ssh_service_request(SSH_SESSION *session,char *service){
STRING *service_s;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_SERVICE_REQUEST);
service_s=string_from_char(service);
@ -208,9 +237,11 @@ int ssh_service_request(SSH_SESSION *session,char *service){
ssh_say(3,"Sent SSH_MSG_SERVICE_REQUEST (service %s)\n",service);
if(packet_wait(session,SSH2_MSG_SERVICE_ACCEPT,1)){
ssh_set_error(session,SSH_FATAL,"did not receive SERVICE_ACCEPT");
leave_function();
return -1;
}
ssh_say(3,"Received SSH_MSG_SERVICE_ACCEPT (service %s)\n",service);
leave_function();
return 0;
}
@ -231,12 +262,14 @@ int ssh_connect(SSH_SESSION *session){
ssh_set_error(session,SSH_FATAL,"Must set options before connect");
return SSH_ERROR;
}
enter_function();
session->alive=0;
session->client=1;
ssh_crypto_init();
ssh_socket_init();
if(options->fd==-1 && !options->host){
ssh_set_error(session,SSH_FATAL,"Hostname required");
leave_function();
return SSH_ERROR;
}
if(options->fd != -1)
@ -244,14 +277,17 @@ int ssh_connect(SSH_SESSION *session){
else
fd=ssh_connect_host(session,options->host,options->bindaddr,options->port,
options->timeout,options->timeout_usec);
if(fd<0)
return -1;
if(fd<0){
leave_function();
return -1;
}
set_status(options,0.2);
ssh_socket_set_fd(session->socket,fd);
session->alive=1;
if(!(session->serverbanner=ssh_get_banner(session))){
ssh_socket_close(session->socket);
session->alive=0;
leave_function();
return -1;
}
set_status(options,0.4);
@ -260,6 +296,7 @@ int ssh_connect(SSH_SESSION *session){
if(ssh_analyze_banner(session,&ssh1,&ssh2)){
ssh_socket_close(session->socket);
session->alive=0;
leave_function();
return -1;
}
/* here we decide which version of the protocol to use */
@ -273,6 +310,7 @@ int ssh_connect(SSH_SESSION *session){
session->serverbanner);
ssh_socket_close(session->socket);
session->alive=0;
leave_function();
return -1;
}
ssh_send_banner(session,0);
@ -282,6 +320,7 @@ int ssh_connect(SSH_SESSION *session){
if(ssh_get_kex(session,0)){
ssh_socket_close(session->socket);
session->alive=0;
leave_function();
return -1;
}
set_status(options,0.6);
@ -289,6 +328,7 @@ int ssh_connect(SSH_SESSION *session){
if(set_kex(session)){
ssh_socket_close(session->socket);
session->alive=0;
leave_function();
return -1;
}
ssh_send_kex(session,0);
@ -296,6 +336,7 @@ int ssh_connect(SSH_SESSION *session){
if(dh_handshake(session)){
ssh_socket_close(session->socket);
session->alive=0;
leave_function();
return -1;
}
set_status(options,1.0);
@ -305,12 +346,14 @@ int ssh_connect(SSH_SESSION *session){
if(ssh_get_kex1(session)){
ssh_socket_close(session->socket);
session->alive=0;
leave_function();
return -1;
}
set_status(options,0.6);
session->connected=1;
break;
}
leave_function();
return 0;
}
@ -331,6 +374,7 @@ char *ssh_get_issue_banner(SSH_SESSION *session){
*/
void ssh_disconnect(SSH_SESSION *session){
STRING *str;
enter_function();
if(ssh_socket_is_open(session->socket)) {
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_DISCONNECT);
@ -342,6 +386,7 @@ void ssh_disconnect(SSH_SESSION *session){
ssh_socket_close(session->socket);
}
session->alive=0;
leave_function();
ssh_cleanup(session);
}

20
libssh/connect.c
Просмотреть файл

@ -98,6 +98,7 @@ int ssh_connect_ai_timeout(SSH_SESSION *session, const char *host, int port, str
fd_set set;
int ret=0;
unsigned int len=sizeof(ret);
enter_function();
to.tv_sec=timeout;
to.tv_usec=usec;
sock_set_nonblocking(s);
@ -110,11 +111,13 @@ int ssh_connect_ai_timeout(SSH_SESSION *session, const char *host, int port, str
/* timeout */
ssh_set_error(session,SSH_FATAL,"Timeout while connecting to %s:%d",host,port);
close(s);
leave_function();
return -1;
}
if(ret<0){
ssh_set_error(session,SSH_FATAL,"Select error : %s",strerror(errno));
close(s);
leave_function();
return -1;
}
ret = 0;
@ -123,11 +126,13 @@ int ssh_connect_ai_timeout(SSH_SESSION *session, const char *host, int port, str
if (ret!=0){
ssh_set_error(session,SSH_FATAL,"Connecting : %s",strerror(ret));
close(s);
leave_function();
return -1;
}
/* s is connected ? */
ssh_say(3,"socket connected with timeout\n");
sock_set_blocking(s);
leave_function();
return s;
}
@ -140,10 +145,11 @@ socket_t ssh_connect_host(SSH_SESSION *session, const char *host, const char
socket_t s=-1;
int my_errno;
struct addrinfo *ai, *ai2;
enter_function();
my_errno=getai(host, port, &ai);
if (my_errno){
ssh_set_error(session,SSH_FATAL,"Failed to resolve hostname %s (%s)",host,gai_strerror(my_errno));
leave_function();
return -1;
}
@ -162,6 +168,7 @@ socket_t ssh_connect_host(SSH_SESSION *session, const char *host, const char
my_errno=getai(host,0,&bind_ai);
if (my_errno){
ssh_set_error(session,SSH_FATAL,"Failed to resolve bind address %s (%s)",bind_addr,gai_strerror(my_errno));
leave_function();
return -1;
}
@ -182,12 +189,15 @@ socket_t ssh_connect_host(SSH_SESSION *session, const char *host, const char
}
}
if(timeout||usec){
return ssh_connect_ai_timeout(session,host,port,ai2,timeout,usec,s);
socket_t ret=ssh_connect_ai_timeout(session,host,port,ai2,timeout,usec,s);
leave_function();
return ret;
}
if(connect(s,ai2->ai_addr,ai2->ai_addrlen)<0){
ssh_set_error(session,SSH_FATAL,"connect: %s",strerror(errno));
close(s);
s=-1;
leave_function();
continue;
}
else{ /*we are connected*/
@ -195,6 +205,7 @@ socket_t ssh_connect_host(SSH_SESSION *session, const char *host, const char
}
}
freeaddrinfo(ai);
leave_function();
return s;
}
@ -214,7 +225,7 @@ int ssh_fd_poll(SSH_SESSION *session, int *write, int *except){
fd_set wdes; // writing set
fd_set edes; // exception set
int fdmax=-1;
enter_function();
FD_ZERO(&rdes);
FD_ZERO(&wdes);
FD_ZERO(&edes);
@ -223,6 +234,7 @@ int ssh_fd_poll(SSH_SESSION *session, int *write, int *except){
*except=1;
*write=0;
session->alive=0;
leave_function();
return 0;
}
if(!session->data_to_read)
@ -238,6 +250,7 @@ int ssh_fd_poll(SSH_SESSION *session, int *write, int *except){
/* Make the call, and listen for errors */
if (select(fdmax, &rdes,&wdes,&edes, &sometime) < 0) {
ssh_set_error(session,SSH_FATAL, "select: %s", strerror(errno));
leave_function();
return -1;
}
if(!session->data_to_read)
@ -246,6 +259,7 @@ int ssh_fd_poll(SSH_SESSION *session, int *write, int *except){
session->data_to_write=ssh_socket_fd_isset(session->socket,&wdes);
*except=ssh_socket_fd_isset(session->socket,&edes);
*write=session->data_to_write;
leave_function();
return session->data_to_read;
}

18
libssh/dh.c
Просмотреть файл

@ -1,7 +1,7 @@
/* dh.c */
/* this file contains usefull stuff for Diffie helman algorithm against SSH 2 */
/*
Copyright 2003 Aris Adamantiadis
Copyright 2003-2008 Aris Adamantiadis
This file is part of the SSH Library
@ -310,6 +310,7 @@ void make_sessionid(SSH_SESSION *session){
BUFFER *server_hash, *client_hash;
BUFFER *buf=buffer_new();
u32 len;
enter_function();
ctx=sha1_init();
str=string_from_char(session->clientbanner);
@ -379,6 +380,7 @@ void make_sessionid(SSH_SESSION *session){
printf("Session hash : ");
ssh_print_hexa("session id",session->next_crypto->session_id,SHA_DIGEST_LEN);
#endif
leave_function();
}
void hashbufout_add_cookie(SSH_SESSION *session){
@ -409,6 +411,7 @@ static void generate_one_key(STRING *k,unsigned char session_id[SHA_DIGEST_LEN],
void generate_session_keys(SSH_SESSION *session){
STRING *k_string;
SHACTX ctx;
enter_function();
k_string=make_bignum_string(session->next_crypto->k);
/* IV */
@ -460,6 +463,7 @@ void generate_session_keys(SSH_SESSION *session){
ssh_print_hexa("Decryption MAC",session->next_crypto->decryptMAC,20);
#endif
free(k_string);
leave_function();
}
/** \addtogroup ssh_session
@ -587,18 +591,24 @@ int signature_verify(SSH_SESSION *session,STRING *signature){
PUBLIC_KEY *pubkey;
SIGNATURE *sign;
int err;
enter_function();
if(session->options->dont_verify_hostkey){
ssh_say(1,"Host key wasn't verified\n");
leave_function();
return 0;
}
pubkey=publickey_from_string(session,session->next_crypto->server_pubkey);
if(!pubkey)
return -1;
if(!pubkey){
leave_function();
return -1;
}
if(session->options->wanted_methods[SSH_HOSTKEYS]){
if(match(session->options->wanted_methods[SSH_HOSTKEYS],pubkey->type_c)){
ssh_set_error(session,SSH_FATAL,"Public key from server (%s) doesn't match user preference (%s)",
pubkey->type_c,session->options->wanted_methods[SSH_HOSTKEYS]);
publickey_free(pubkey);
leave_function();
return -1;
}
}
@ -606,6 +616,7 @@ int signature_verify(SSH_SESSION *session,STRING *signature){
if(!sign){
ssh_set_error(session,SSH_FATAL,"Invalid signature blob");
publickey_free(pubkey);
leave_function();
return -1;
}
ssh_say(1,"Going to verify a %s type signature\n",pubkey->type_c);
@ -613,6 +624,7 @@ int signature_verify(SSH_SESSION *session,STRING *signature){
signature_free(sign);
session->next_crypto->server_pubkey_type=pubkey->type_c;
publickey_free(pubkey);
leave_function();
return err;
}

28
libssh/kex.c
Просмотреть файл

@ -165,10 +165,14 @@ int ssh_get_kex(SSH_SESSION *session,int server_kex ){
STRING *str;
char *strings[10];
int i;
if(packet_wait(session,SSH2_MSG_KEXINIT,1))
return -1;
enter_function();
if(packet_wait(session,SSH2_MSG_KEXINIT,1)){
leave_function();
return -1;
}
if(buffer_get_data(session->in_buffer,session->server_kex.cookie,16)!=16){
ssh_set_error(session,SSH_FATAL,"get_kex(): no cookie in packet");
leave_function();
return -1;
}
hashbufin_add_cookie(session,session->server_kex.cookie);
@ -194,6 +198,7 @@ int ssh_get_kex(SSH_SESSION *session,int server_kex ){
for(i=0;i<10;++i)
session->server_kex.methods[i]=strings[i];
}
leave_function();
return 0;
}
@ -217,6 +222,7 @@ int set_kex(SSH_SESSION *session){
SSH_OPTIONS *options=session->options;
int i;
char *wanted;
enter_function();
/* the client might ask for a specific cookie to be sent. useful for server debugging */
if(options->wanted_cookie)
memcpy(client->cookie,options->wanted_cookie,16);
@ -231,12 +237,14 @@ int set_kex(SSH_SESSION *session){
if(!client->methods[i] && i < SSH_LANG_C_S){
ssh_set_error(session,SSH_FATAL,"kex error : did not find one of algos %s in list %s for %s",
wanted,server->methods[i],ssh_kex_nums[i]);
leave_function();
return -1;
} else {
if(i>=SSH_LANG_C_S && !client->methods[i])
client->methods[i]=strdup(""); // we can safely do that for languages
}
}
leave_function();
return 0;
}
@ -245,6 +253,7 @@ void ssh_send_kex(SSH_SESSION *session, int server_kex){
STRING *str;
int i=0;
KEX *kex=(server_kex ? &session->server_kex : &session->client_kex);
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_KEXINIT);
buffer_add_data(session->out_buffer,kex->cookie,16);
@ -260,6 +269,7 @@ void ssh_send_kex(SSH_SESSION *session, int server_kex){
buffer_add_u8(session->out_buffer,0);
buffer_add_u32(session->out_buffer,0);
packet_send(session);
leave_function();
}
/* returns 1 if at least one of the name algos is in the default algorithms table */
@ -401,13 +411,16 @@ int ssh_get_kex1(SSH_SESSION *session){
PUBLIC_KEY *svr,*host;
int ko;
u16 bits;
enter_function();
ssh_say(3,"Waiting for a SSH_SMSG_PUBLIC_KEY\n");
if(packet_wait(session,SSH_SMSG_PUBLIC_KEY,1)){
leave_function();
return -1;
}
ssh_say(3,"Got a SSH_SMSG_PUBLIC_KEY\n");
if(buffer_get_data(session->in_buffer,session->server_kex.cookie,8)!=8){
ssh_set_error(session,SSH_FATAL,"Can't get cookie in buffer");
leave_function();
return -1;
}
buffer_get_u32(session->in_buffer,&server_bits);
@ -430,6 +443,7 @@ int ssh_get_kex1(SSH_SESSION *session){
free(server_mod);
if(server_exp)
free(server_exp);
leave_function();
return -1;
}
server_bits=ntohl(server_bits);
@ -457,6 +471,7 @@ int ssh_get_kex1(SSH_SESSION *session){
/* hardcode 3des */
if(!(supported_ciphers_mask & (1<<SSH_CIPHER_3DES))){
ssh_set_error(session,SSH_FATAL,"Remote server doesn't accept 3des");
leave_function();
return -1;
}
packet_clear_out(session);
@ -477,18 +492,21 @@ int ssh_get_kex1(SSH_SESSION *session){
packet_send(session);
/* we can set encryption */
if(crypt_set_algorithms(session))
return -1;
if(crypt_set_algorithms(session)){
leave_function();
return -1;
}
session->current_crypto=session->next_crypto;
session->next_crypto=NULL;
if(packet_wait(session,SSH_SMSG_SUCCESS,1)){
char buffer[1024];
snprintf(buffer,sizeof(buffer),"Key exchange failed : %s",ssh_get_error(session));
ssh_set_error(session,SSH_FATAL,"%s",buffer);
leave_function();
return -1;
}
ssh_say(1,"received SSH_SMSG_SUCCESS\n");
leave_function();
return 0;
}

1
libssh/keyfiles.c
Просмотреть файл

@ -850,6 +850,7 @@ static char **ssh_parse_knownhost(char *filename, char *hostname, char *type){
* \see ssh_options_set_wanted_algo()
* \see ssh_get_pubkey_hash()
* \bug there is no current way to remove or modify an entry into the known host table
* \todo TODO this is a real mess. Clean this up someday
*/
int ssh_is_server_known(SSH_SESSION *session){
char *pubkey_64;

61
libssh/log.c Обычный файл
Просмотреть файл

@ -0,0 +1,61 @@
/*
* Copyright 2008 Aris Adamantiadis
*
* This file is part of the SSH Library
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The SSH Library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SSH Library; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA. */
/** \defgroup ssh_log SSH logging
* \brief Logging functions for debugging and problem resolving
*/
/** \addtogroup ssh_log
* @{ */
#include "libssh/priv.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
/** \brief logs an event
* \param session the SSH session
* \param verbosity verbosity of the event
* \param format format string of the log entry
*/
void ssh_log(SSH_SESSION *session, int verbosity, char *format, ...){
char buffer[1024];
char buf2[256];
int min;
va_list va;
if(verbosity <= session->log_verbosity){
va_start(va,format);
vsnprintf(buffer,sizeof(buffer),format,va);
va_end(va);
if(session->options->log_function)
session->options->log_function(buffer,session,verbosity);
else if(verbosity==SSH_LOG_FUNCTIONS){
if(session->log_indent > 255)
min=255;
else
min=session->log_indent;
memset(buf2,' ',min);
buf2[min]=0;
fprintf(stderr,"[func] %s%s\n",buf2,buffer);
} else {
fprintf(stderr,"[%d] %s\n",verbosity,buffer);
}
}
}
/** @} */

98
libssh/messages.c
Просмотреть файл

@ -48,9 +48,11 @@ static SSH_MESSAGE *message_new(SSH_SESSION *session){
static int handle_service_request(SSH_SESSION *session){
STRING *service;
char *service_c;
enter_function();
service=buffer_get_ssh_string(session->in_buffer);
if(!service){
ssh_set_error(session,SSH_FATAL,"Invalid SSH_MSG_SERVICE_REQUEST packet");
leave_function();
return -1;
}
service_c=string_to_char(service);
@ -61,6 +63,7 @@ static int handle_service_request(SSH_SESSION *session){
buffer_add_ssh_string(session->out_buffer,service);
packet_send(session);
free(service);
leave_function();
return 0;
}
@ -76,6 +79,7 @@ static SSH_MESSAGE *handle_userauth_request(SSH_SESSION *session){
STRING *method=buffer_get_ssh_string(session->in_buffer);
SSH_MESSAGE *msg;
char *service_c,*method_c;
enter_function();
msg=message_new(session);
msg->type=SSH_AUTH_REQUEST;
msg->auth_request.username=string_to_char(user);
@ -88,6 +92,7 @@ static SSH_MESSAGE *handle_userauth_request(SSH_SESSION *session){
if(!strcmp(method_c,"none")){
msg->auth_request.method=SSH_AUTH_NONE;
free(method_c);
leave_function();
return msg;
}
if(!strcmp(method_c,"password")){
@ -99,10 +104,12 @@ static SSH_MESSAGE *handle_userauth_request(SSH_SESSION *session){
pass=buffer_get_ssh_string(session->in_buffer);
msg->auth_request.password=string_to_char(pass);
free(pass);
leave_function();
return msg;
}
msg->auth_request.method=SSH_AUTH_UNKNOWN;
free(method_c);
leave_function();
return msg;
}
@ -121,18 +128,21 @@ void ssh_message_auth_set_methods(SSH_MESSAGE *msg,int methods){
static int ssh_message_auth_reply_default(SSH_MESSAGE *msg,int partial){
char methods_c[128]="";
STRING *methods;
packet_clear_out(msg->session);
buffer_add_u8(msg->session->out_buffer,SSH2_MSG_USERAUTH_FAILURE);
if(msg->session->auth_methods==0){
msg->session->auth_methods=SSH_AUTH_PUBLICKEY|SSH_AUTH_PASSWORD;
SSH_SESSION *session=msg->session;
int ret;
enter_function();
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_USERAUTH_FAILURE);
if(session->auth_methods==0){
session->auth_methods=SSH_AUTH_PUBLICKEY|SSH_AUTH_PASSWORD;
}
if(msg->session->auth_methods & SSH_AUTH_PUBLICKEY)
if(session->auth_methods & SSH_AUTH_PUBLICKEY)
strcat(methods_c,"publickey,");
if(msg->session->auth_methods & SSH_AUTH_KEYBINT)
if(session->auth_methods & SSH_AUTH_KEYBINT)
strcat(methods_c,"keyboard-interactive,");
if(msg->session->auth_methods & SSH_AUTH_PASSWORD)
if(session->auth_methods & SSH_AUTH_PASSWORD)
strcat(methods_c,"password,");
if(msg->session->auth_methods & SSH_AUTH_HOSTBASED)
if(session->auth_methods & SSH_AUTH_HOSTBASED)
strcat(methods_c,"hostbased,");
methods_c[strlen(methods_c)-1]=0; // strip the comma. We are sure there is at
// least one word into the list
@ -141,10 +151,12 @@ static int ssh_message_auth_reply_default(SSH_MESSAGE *msg,int partial){
buffer_add_ssh_string(msg->session->out_buffer,methods);
free(methods);
if(partial)
buffer_add_u8(msg->session->out_buffer,1);
buffer_add_u8(session->out_buffer,1);
else
buffer_add_u8(msg->session->out_buffer,0); // no partial success
return packet_send(msg->session);
buffer_add_u8(session->out_buffer,0); // no partial success
ret = packet_send(msg->session);
leave_function();
return ret;
}
int ssh_message_auth_reply_success(SSH_MESSAGE *msg,int partial){
@ -156,6 +168,7 @@ int ssh_message_auth_reply_success(SSH_MESSAGE *msg,int partial){
}
static SSH_MESSAGE *handle_channel_request_open(SSH_SESSION *session){
enter_function();
SSH_MESSAGE *msg=message_new(session);
STRING *type;
char *type_c;
@ -173,32 +186,38 @@ static SSH_MESSAGE *handle_channel_request_open(SSH_SESSION *session){
msg->channel_request_open.packet_size=ntohl(packet);
if(!strcmp(type_c,"session")){
msg->channel_request_open.type=SSH_CHANNEL_SESSION;
leave_function();
return msg;
}
msg->channel_request_open.type=SSH_CHANNEL_UNKNOWN;
leave_function();
return msg;
}
CHANNEL *ssh_message_channel_request_open_reply_accept(SSH_MESSAGE *msg){
CHANNEL *chan=channel_new(msg->session);
chan->local_channel=ssh_channel_new_id(msg->session);
SSH_SESSION *session=msg->session;
enter_function();
CHANNEL *chan=channel_new(session);
chan->local_channel=ssh_channel_new_id(session);
chan->local_maxpacket=35000;
chan->local_window=32000;
chan->remote_channel=msg->channel_request_open.sender;
chan->remote_maxpacket=msg->channel_request_open.packet_size;
chan->remote_window=msg->channel_request_open.window;
chan->open=1;
packet_clear_out(msg->session);
buffer_add_u8(msg->session->out_buffer,SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
buffer_add_u32(msg->session->out_buffer,htonl(chan->remote_channel));
buffer_add_u32(msg->session->out_buffer,htonl(chan->local_channel));
buffer_add_u32(msg->session->out_buffer,htonl(chan->local_window));
buffer_add_u32(msg->session->out_buffer,htonl(chan->local_maxpacket));
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
buffer_add_u32(session->out_buffer,htonl(chan->remote_channel));
buffer_add_u32(session->out_buffer,htonl(chan->local_channel));
buffer_add_u32(session->out_buffer,htonl(chan->local_window));
buffer_add_u32(session->out_buffer,htonl(chan->local_maxpacket));
ssh_say(2,"Accepting a channel request_open for chan %d\n",chan->remote_channel);
if(packet_send(msg->session)){
if(packet_send(session)){
channel_free(chan);
leave_function();
return NULL;
}
leave_function();
return chan;
}
@ -219,6 +238,7 @@ static SSH_MESSAGE *handle_channel_request(SSH_SESSION *session){
char *type_c;
u8 want_reply;
SSH_MESSAGE *msg=message_new(session);
enter_function();
buffer_get_u32(session->in_buffer,&channel);
channel=ntohl(channel);
type=buffer_get_ssh_string(session->in_buffer);
@ -247,6 +267,7 @@ static SSH_MESSAGE *handle_channel_request(SSH_SESSION *session){
msg->channel_request.pxwidth=ntohl(msg->channel_request.pxwidth);
msg->channel_request.pxheight=ntohl(msg->channel_request.pxheight);
msg->channel_request.modes=buffer_get_ssh_string(session->in_buffer);
leave_function();
return msg;
}
if(!strcmp(type_c,"subsystem")){
@ -257,10 +278,12 @@ static SSH_MESSAGE *handle_channel_request(SSH_SESSION *session){
free(subsys);
msg->channel_request.type=SSH_CHANNEL_REQUEST_SUBSYSTEM;
msg->channel_request.subsystem=subsys_c;
leave_function();
return msg;
}
if(!strcmp(type_c,"shell")){
msg->channel_request.type=SSH_CHANNEL_REQUEST_SHELL;
leave_function();
return msg;
}
if(!strcmp(type_c,"exec")){
@ -268,10 +291,12 @@ static SSH_MESSAGE *handle_channel_request(SSH_SESSION *session){
msg->channel_request.type=SSH_CHANNEL_REQUEST_EXEC;
msg->channel_request.command=string_to_char(cmd);
free(cmd);
leave_function();
return msg;
}
msg->channel_request.type=SSH_CHANNEL_UNKNOWN;
leave_function();
return msg;
}
@ -310,34 +335,43 @@ static int ssh_message_channel_request_reply_default(SSH_MESSAGE *msg){
}
SSH_MESSAGE *ssh_message_get(SSH_SESSION *session){
SSH_MESSAGE *ret;
enter_function();
while(1){
if(packet_read(session))
return NULL;
if(packet_translate(session))
return NULL;
if(packet_read(session) || packet_translate(session)){
leave_function();
return NULL;
}
switch(session->in_packet.type){
case SSH2_MSG_SERVICE_REQUEST:
if(handle_service_request(session))
return NULL;
if(handle_service_request(session)){
leave_function();
return NULL;
}
break;
case SSH2_MSG_IGNORE:
case SSH2_MSG_DEBUG:
break;
case SSH2_MSG_USERAUTH_REQUEST:
return handle_userauth_request(session);
break;
ret = handle_userauth_request(session);
leave_function();
return ret;
case SSH2_MSG_CHANNEL_OPEN:
return handle_channel_request_open(session);
break;
ret = handle_channel_request_open(session);
leave_function();
return ret;
case SSH2_MSG_CHANNEL_REQUEST:
return handle_channel_request(session);
break;
ret = handle_channel_request(session);
leave_function();
return ret;
default:
handle_unimplemented(session);
ssh_set_error(session,SSH_FATAL,"Unhandled message %d\n",session->in_packet.type);
leave_function();
return NULL;
}
}
leave_function();
return NULL;
}

27
libssh/options.c
Просмотреть файл

@ -108,6 +108,8 @@ SSH_OPTIONS *ssh_options_copy(SSH_OPTIONS *opt){
ret->timeout_usec=opt->timeout_usec;
ret->ssh2allowed=opt->ssh2allowed;
ret->ssh1allowed=opt->ssh1allowed;
ret->log_function=opt->log_function;
ret->log_verbosity=opt->log_verbosity;
return ret;
}
@ -406,6 +408,29 @@ void ssh_options_allow_ssh2(SSH_OPTIONS *opt, int allow){
opt->ssh2allowed=0;
}
/** Default is a write on stderr
* \brief Change the writer callback for logging
* \param opt options structure
* \param callback a callback function for the printing
* \warning the message string may contain format string characters.
*/
void ssh_options_set_log_function(SSH_OPTIONS *opt,
void (*callback)(const char *message, SSH_SESSION *session, int priority )){
opt->log_function=callback;
}
/** \brief set this session's logging priority
* \param opt options structure
* \param verbosity verbosity of the messages. Every log smaller or equal to verbosity will be shown\n
* SSH_LOG_NOLOG No logging \n
* SSH_LOG_RARE Rare conditions or warnings\n
* SSH_LOG_ENTRY Api-accessible entrypoints\n
* SSH_LOG_PACKET Packet id and size\n
* SSH_LOG_FUNCTIONS function entering and leaving\n
*/
void ssh_options_set_log_verbosity(SSH_OPTIONS *opt, int verbosity){
opt->log_verbosity=verbosity;
}
/**
* This is a helper for your application to generate the appropriate
* options from the command line arguments.\n
@ -502,7 +527,7 @@ int ssh_options_getopt(SSH_OPTIONS *options, int *argcptr, char **argv){
ssh_set_error(options,SSH_FATAL,"either RSA or DSS must be chosen");
cont=0;
}
ssh_set_verbosity(debuglevel);
ssh_options_set_log_verbosity(options,debuglevel);
optind=saveoptind;
if(!cont){
free(save);

109
libssh/packet.c
Просмотреть файл

@ -33,13 +33,12 @@ MA 02111-1307, USA. */
/* XXX include selected mac size */
static int macsize=SHA_DIGEST_LEN;
/* in nonblocking mode, socket_read will read as much as it can, and return */
/* SSH_OK if it has read at least len bytes, otherwise, SSH_AGAIN. */
/* in blocking mode, it will read at least len bytes and will block until it's ok. */
static int socket_read(SSH_SESSION *session,int len){
enter_function();
int except, can_write;
int to_read;
int r;
@ -48,8 +47,10 @@ static int socket_read(SSH_SESSION *session,int len){
if(!session->in_socket_buffer)
session->in_socket_buffer=buffer_new();
to_read=len - buffer_get_rest_len(session->in_socket_buffer);
if(to_read <= 0)
if(to_read <= 0){
leave_function();
return SSH_OK;
}
if(session->blocking){
buf=malloc(to_read);
r=ssh_socket_completeread(session->socket,buf,to_read);
@ -60,18 +61,22 @@ static int socket_read(SSH_SESSION *session,int len){
ssh_socket_close(session->socket);
session->alive=0;
session->data_except=1;
leave_function();
return SSH_ERROR;
}
buffer_add_data(session->in_socket_buffer,buf,to_read);
free(buf);
leave_function();
return SSH_OK;
}
/* nonblocking read */
do {
ssh_fd_poll(session,&can_write,&except); /* internally sets data_to_read */
if(!session->data_to_read)
return SSH_AGAIN;
if(!session->data_to_read){
leave_function();
return SSH_AGAIN;
}
session->data_to_read=0;
/* read as much as we can */
if(ssh_socket_is_open(session->socket))
@ -84,10 +89,12 @@ static int socket_read(SSH_SESSION *session,int len){
ssh_socket_close(session->socket);
session->data_except=1;
session->alive=0;
leave_function();
return SSH_ERROR;
}
buffer_add_data(session->in_socket_buffer,buffer,r);
} while(buffer_get_rest_len(session->in_socket_buffer)<len);
leave_function();
return SSH_OK;
}
@ -104,8 +111,11 @@ static int packet_read2(SSH_SESSION *session){
u8 padding;
unsigned int blocksize=(session->current_crypto?session->current_crypto->in_cipher->blocksize:8);
int current_macsize=session->current_crypto?macsize:0;
if(!session->alive || session->data_except)
enter_function();
if(!session->alive || session->data_except){
leave_function();
return SSH_ERROR; // the error message was already set into this session
}
switch(session->packet_state){
case PACKET_STATE_INIT:
memset(&session->in_packet,0,sizeof(PACKET));
@ -114,8 +124,10 @@ static int packet_read2(SSH_SESSION *session){
else
session->in_buffer=buffer_new();
ret=socket_read(session,blocksize);
if(ret != SSH_OK)
return ret; // can be SSH_ERROR or SSH_AGAIN
if(ret != SSH_OK){
leave_function();
return ret; // can be SSH_ERROR or SSH_AGAIN
}
// be_read=completeread(session->fd,buffer,blocksize);
memcpy(buffer,buffer_get_rest(session->in_socket_buffer),blocksize);
buffer_pass_bytes(session->in_socket_buffer,blocksize); // mark them as read
@ -123,12 +135,14 @@ static int packet_read2(SSH_SESSION *session){
buffer_add_data(session->in_buffer,buffer,blocksize);
if(len> MAX_PACKET_LEN){
ssh_set_error(session,SSH_FATAL,"read_packet(): Packet len too high(%uld %.8lx)",len,len);
leave_function();
return SSH_ERROR;
}
to_be_read=len-blocksize+sizeof(u32);
if(to_be_read<0){
/* remote sshd sends invalid sizes?*/
ssh_set_error(session,SSH_FATAL,"given numbers of bytes left to be read <0 (%d)!",to_be_read);
leave_function();
return SSH_ERROR;
}
/* saves the status of the current operations */
@ -140,8 +154,10 @@ static int packet_read2(SSH_SESSION *session){
/* if to_be_read is zero, the whole packet was blocksize bytes. */
if(to_be_read != 0){
ret=socket_read(session,to_be_read);
if(ret!=SSH_OK)
return ret;
if(ret!=SSH_OK){
leave_function();
return ret;
}
packet=malloc(to_be_read);
memcpy(packet,buffer_get_rest(session->in_socket_buffer),to_be_read-current_macsize);
buffer_pass_bytes(session->in_socket_buffer,to_be_read-current_macsize);
@ -157,6 +173,7 @@ static int packet_read2(SSH_SESSION *session){
buffer_pass_bytes(session->in_socket_buffer,macsize);
if(packet_hmac_verify(session,session->in_buffer,mac)){
ssh_set_error(session,SSH_FATAL,"HMAC error");
leave_function();
return SSH_ERROR;
}
}
@ -164,6 +181,7 @@ static int packet_read2(SSH_SESSION *session){
/*pass the size which has been processed before*/
if(!buffer_get_u8(session->in_buffer,&padding)){
ssh_set_error(session,SSH_FATAL,"Packet too short to read padding");
leave_function();
return SSH_ERROR;
}
ssh_say(3,"%hhd bytes padding, %d bytes left in buffer\n",
@ -175,6 +193,7 @@ static int packet_read2(SSH_SESSION *session){
ssh_print_hexa("incrimined packet",
buffer_get(session->in_buffer),buffer_get_len(session->in_buffer));
#endif
leave_function();
return SSH_ERROR;
}
buffer_pass_bytes_end(session->in_buffer,padding);
@ -187,9 +206,11 @@ static int packet_read2(SSH_SESSION *session){
#endif
session->recv_seq++;
session->packet_state=PACKET_STATE_INIT;
leave_function();
return SSH_OK;
}
ssh_set_error(session,SSH_FATAL,"Invalid state into packet_read2() : %d",session->packet_state);
leave_function();
return SSH_ERROR;
}
@ -306,16 +327,21 @@ int packet_read(SSH_SESSION *session){
}
int packet_translate(SSH_SESSION *session){
enter_function();
memset(&session->in_packet,0,sizeof(PACKET));
if(!session->in_buffer)
return -1;
if(!session->in_buffer){
leave_function();
return -1;
}
ssh_say(3,"Final size %d\n",buffer_get_rest_len(session->in_buffer));
if(!buffer_get_u8(session->in_buffer,&session->in_packet.type)){
ssh_set_error(session,SSH_FATAL,"Packet too short to read type");
leave_function();
return -1;
}
ssh_say(3,"type %hhd\n",session->in_packet.type);
session->in_packet.valid=1;
leave_function();
return 0;
}
@ -339,11 +365,13 @@ static int atomic_write(struct socket *s, void *buffer, int len){
static int packet_nonblocking_flush(SSH_SESSION *session){
int except, can_write;
int w;
enter_function();
ssh_fd_poll(session,&can_write,&except); /* internally sets data_to_write */
if(!ssh_socket_is_open(session->socket)){
session->alive=0;
// FIXME use ssh_socket_get_errno
ssh_set_error(session,SSH_FATAL,"Writing packet : error on socket (or connection closed): %s",strerror(errno));
leave_function();
return SSH_ERROR;
}
while(session->data_to_write && buffer_get_rest_len(session->out_socket_buffer)>0){
@ -361,27 +389,37 @@ static int packet_nonblocking_flush(SSH_SESSION *session){
// FIXME use ssh_socket_get_errno()
ssh_set_error(session,SSH_FATAL,"Writing packet : error on socket (or connection closed): %s",
strerror(errno));
leave_function();
return SSH_ERROR;
}
buffer_pass_bytes(session->out_socket_buffer,w);
/* refresh the socket status */
ssh_fd_poll(session,&can_write,&except);
}
if(buffer_get_rest_len(session->out_socket_buffer)>0)
return SSH_AGAIN; /* there is data pending */
if(buffer_get_rest_len(session->out_socket_buffer)>0){
leave_function();
return SSH_AGAIN; /* there is data pending */
}
leave_function();
return SSH_OK; // all data written
}
/* blocking packet flush */
static int packet_blocking_flush(SSH_SESSION *session){
enter_function();
if(!ssh_socket_is_open(session->socket)) {
session->alive=0;
leave_function();
return SSH_ERROR;
}
if(session->data_except)
return SSH_ERROR;
if(buffer_get_rest(session->out_socket_buffer)==0)
if(session->data_except){
leave_function();
return SSH_ERROR;
}
if(buffer_get_rest(session->out_socket_buffer)==0){
leave_function();
return SSH_OK;
}
if(atomic_write(session->socket,buffer_get_rest(session->out_socket_buffer),
buffer_get_rest_len(session->out_socket_buffer))){
session->data_to_write=0;
@ -391,10 +429,12 @@ static int packet_blocking_flush(SSH_SESSION *session){
// FIXME use the proper errno
ssh_set_error(session,SSH_FATAL,"Writing packet : error on socket (or connection closed): %s",
strerror(errno));
leave_function();
return SSH_ERROR;
}
session->data_to_write=0;
buffer_reinit(session->out_socket_buffer);
leave_function();
return SSH_OK; // no data pending
}
@ -410,15 +450,19 @@ int packet_flush(SSH_SESSION *session, int enforce_blocking){
/* this function places the outgoing packet buffer into an outgoing socket buffer */
static int socket_write(SSH_SESSION *session){
int ret;
enter_function();
if(!session->out_socket_buffer){
session->out_socket_buffer=buffer_new();
}
buffer_add_data(session->out_socket_buffer,
buffer_get(session->out_buffer),buffer_get_len(session->out_buffer));
if(!session->blocking){
return packet_nonblocking_flush(session);
} else
return packet_blocking_flush(session);
if(!session->blocking)
ret = packet_nonblocking_flush(session);
else
ret = packet_blocking_flush(session);
leave_function();
return ret;
}
static int packet_send2(SSH_SESSION *session){
@ -429,6 +473,7 @@ static int packet_send2(SSH_SESSION *session){
unsigned char *hmac;
int ret=0;
unsigned int blocksize=(session->current_crypto?session->current_crypto->out_cipher->blocksize:8);
enter_function();
ssh_say(3,"Writing on the wire a packet having %ld bytes before",currentlen);
#ifdef HAVE_LIBZ
if(session->current_crypto && session->current_crypto->do_compress_out){
@ -455,6 +500,7 @@ static int packet_send2(SSH_SESSION *session){
ret=socket_write(session);
session->send_seq++;
buffer_reinit(session->out_buffer);
leave_function();
return ret; /* SSH_OK, AGAIN or ERROR */
}
@ -611,16 +657,22 @@ static int packet_wait1(SSH_SESSION *session,int type,int blocking){
#endif /* HAVE_SSH1 */
static int packet_wait2(SSH_SESSION *session,int type,int blocking){
int ret;
enter_function();
while(1){
ret=packet_read2(session);
if(ret != SSH_OK)
return ret;
if(packet_translate(session))
if(ret != SSH_OK){
leave_function();
return ret;
}
if(packet_translate(session)){
leave_function();
return SSH_ERROR;
}
switch(session->in_packet.type){
case SSH2_MSG_DISCONNECT:
packet_parse(session);
ssh_say(2,"received disconnect packet\n");
leave_function();
return SSH_ERROR;
case SSH2_MSG_CHANNEL_WINDOW_ADJUST:
case SSH2_MSG_CHANNEL_DATA:
@ -635,13 +687,18 @@ static int packet_wait2(SSH_SESSION *session,int type,int blocking){
default:
if(type && (type != session->in_packet.type)){
ssh_set_error(session,SSH_FATAL,"waitpacket(): Received a %d type packet, was waiting for a %d\n",session->in_packet.type,type);
leave_function();
return SSH_ERROR;
}
leave_function();
return SSH_OK;
}
if(blocking==0)
return SSH_OK; //shouldn't it return SSH_AGAIN here ?
if(blocking==0){
leave_function();
return SSH_OK; //shouldn't it return SSH_AGAIN here ?
}
}
leave_function();
return SSH_OK;
}
int packet_wait(SSH_SESSION *session, int type, int block){

19
libssh/session.c
Просмотреть файл

@ -44,10 +44,12 @@ SSH_SESSION *ssh_new() {
session->socket=ssh_socket_new();
session->alive=0;
session->blocking=1;
session->log_indent=0;
return session;
}
void ssh_cleanup(SSH_SESSION *session){
enter_function();
int i;
if(session->serverbanner)
free(session->serverbanner);
@ -95,15 +97,19 @@ void ssh_cleanup(SSH_SESSION *session){
memset(session,'X',sizeof(SSH_SESSION)); /* burn connection, it could hangs
sensitive datas */
free(session);
//leave_function();
}
/** \brief disconnect impolitely from remote host
* \param session current ssh session
*/
void ssh_silent_disconnect(SSH_SESSION *session){
enter_function();
ssh_log(session,SSH_LOG_ENTRY,"ssh_silent_disconnect()");
ssh_socket_close(session->socket);
session->alive=0;
ssh_disconnect(session);
//leave_function();
}
/** \brief set the options for the current session
@ -114,6 +120,7 @@ void ssh_silent_disconnect(SSH_SESSION *session){
*/
void ssh_set_options(SSH_SESSION *session, SSH_OPTIONS *options){
session->options=options;
session->log_verbosity=options->log_verbosity;
}
/** \brief set the session in blocking/nonblocking mode
@ -163,16 +170,22 @@ void ssh_set_fd_except(SSH_SESSION *session){
/* looks if there is data to read on the socket and parse it. */
int ssh_handle_packets(SSH_SESSION *session){
int w,err,r,i=0;
enter_function();
do {
r=ssh_fd_poll(session,&w,&err);
if(r<=0)
if(r<=0){
leave_function();
return r; // error or no data available
}
/* if an exception happened, it will be trapped by packet_read() */
if(packet_read(session)||packet_translate(session))
return -1;
if(packet_read(session)||packet_translate(session)){
leave_function();
return -1;
}
packet_parse(session);
++i;
} while(r>0 && i<5);
leave_function();
return r;
}

40
libssh/sftp.c
Просмотреть файл

@ -42,6 +42,8 @@ MA 02111-1307, USA. */
/* can fetch it, while continuing to read for other messages (it is inspecified in which order messages may */
/* be sent back to the client */
#define sftp_enter_function() _enter_function(sftp->channel->session)
#define sftp_leave_function() _leave_function(sftp->channel->session)
/* functions */
void sftp_enqueue(SFTP_SESSION *session, SFTP_MESSAGE *msg);
@ -49,18 +51,22 @@ static void sftp_message_free(SFTP_MESSAGE *msg);
SFTP_SESSION *sftp_new(SSH_SESSION *session){
SFTP_SESSION *sftp=malloc(sizeof(SFTP_SESSION));
enter_function();
memset(sftp,0,sizeof(SFTP_SESSION));
sftp->session=session;
sftp->channel=channel_new(session);
if(channel_open_session(sftp->channel)){
channel_free(sftp->channel);
free(sftp);
leave_function();
return NULL;
}
if(channel_request_sftp(sftp->channel)){
sftp_free(sftp);
leave_function();
return NULL;
}
leave_function();
return sftp;
}
@ -138,11 +144,13 @@ int sftp_packet_write(SFTP_SESSION *sftp,u8 type, BUFFER *payload){
SFTP_PACKET *sftp_packet_read(SFTP_SESSION *sftp){
SFTP_PACKET *packet=malloc(sizeof(SFTP_PACKET));
u32 size;
sftp_enter_function();
packet->sftp=sftp;
packet->payload=buffer_new();
if(channel_read(sftp->channel,packet->payload,4,0)<=0){
buffer_free(packet->payload);
free(packet);
sftp_leave_function();
return NULL;
}
buffer_get_u32(packet->payload,&size);
@ -150,6 +158,7 @@ SFTP_PACKET *sftp_packet_read(SFTP_SESSION *sftp){
if(channel_read(sftp->channel,packet->payload,1,0)<=0){
buffer_free(packet->payload);
free(packet);
sftp_leave_function();
return NULL;
}
buffer_get_u8(packet->payload,&packet->type);
@ -157,8 +166,10 @@ SFTP_PACKET *sftp_packet_read(SFTP_SESSION *sftp){
if(channel_read(sftp->channel,packet->payload,size-1,0)<=0){
buffer_free(packet->payload);
free(packet);
sftp_leave_function();
return NULL;
}
sftp_leave_function();
return packet;
}
@ -196,17 +207,23 @@ SFTP_MESSAGE *sftp_get_message(SFTP_PACKET *packet){
return msg;
}
int sftp_read_and_dispatch(SFTP_SESSION *session){
int sftp_read_and_dispatch(SFTP_SESSION *sftp){
SFTP_PACKET *packet;
SFTP_MESSAGE *message=NULL;
packet=sftp_packet_read(session);
if(!packet)
return -1; /* something nasty happened reading the packet */
sftp_enter_function();
packet=sftp_packet_read(sftp);
if(!packet){
sftp_leave_function();
return -1; /* something nasty happened reading the packet */
}
message=sftp_get_message(packet);
sftp_packet_free(packet);
if(!message)
return -1;
sftp_enqueue(session,message);
if(!message){
sftp_leave_function();
return -1;
}
sftp_enqueue(sftp,message);
sftp_leave_function();
return 0;
}
@ -222,15 +239,19 @@ int sftp_init(SFTP_SESSION *sftp){
STRING *ext_name_s=NULL, *ext_data_s=NULL;
char *ext_name,*ext_data;
u32 version=htonl(LIBSFTP_VERSION);
sftp_enter_function();
buffer_add_u32(buffer,version);
sftp_packet_write(sftp,SSH_FXP_INIT,buffer);
buffer_free(buffer);
packet=sftp_packet_read(sftp);
if(!packet)
return -1;
if(!packet){
sftp_leave_function();
return -1;
}
if(packet->type != SSH_FXP_VERSION){
ssh_set_error(sftp->session,SSH_FATAL,"Received a %d messages instead of SSH_FXP_VERSION",packet->type);
sftp_packet_free(packet);
sftp_leave_function();
return -1;
}
buffer_get_u32(packet->payload,&version);
@ -250,6 +271,7 @@ int sftp_init(SFTP_SESSION *sftp){
free(ext_data_s);
sftp_packet_free(packet);
sftp->version=sftp->server_version=version;
sftp_leave_function();
return 0;
}