Mercurial > dropbear
annotate cli-auth.c @ 43:942b22d7dd1c
Banner printing
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Mon, 02 Aug 2004 04:25:05 +0000 |
| parents | b4874d772210 |
| children | 9ee8996a375f |
| rev | line source |
|---|---|
| 33 | 1 #include "includes.h" |
| 2 #include "session.h" | |
| 3 #include "auth.h" | |
| 4 #include "dbutil.h" | |
| 5 #include "buffer.h" | |
| 6 #include "ssh.h" | |
| 7 #include "packet.h" | |
| 8 #include "runopts.h" | |
| 9 | |
|
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b4874d772210
- Added terminal mode handling etc for the client, and window change
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parents:
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diff
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10 #undef DROPBEAR_PUBKEY_AUTH |
|
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
37
diff
changeset
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11 |
| 33 | 12 void cli_authinitialise() { |
| 13 | |
| 14 memset(&ses.authstate, 0, sizeof(ses.authstate)); | |
| 15 } | |
| 16 | |
| 17 | |
| 18 /* Send a "none" auth request to get available methods */ | |
| 19 void cli_auth_getmethods() { | |
| 20 | |
| 21 TRACE(("enter cli_auth_getmethods")); | |
| 22 | |
| 23 CHECKCLEARTOWRITE(); | |
| 24 | |
| 25 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST); | |
|
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0ad5fb979f42
set the isserver flag (oops)
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parents:
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26 buf_putstring(ses.writepayload, cli_opts.username, |
|
0ad5fb979f42
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parents:
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27 strlen(cli_opts.username)); |
| 33 | 28 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION, |
| 29 SSH_SERVICE_CONNECTION_LEN); | |
| 30 buf_putstring(ses.writepayload, "none", 4); /* 'none' method */ | |
| 31 | |
| 32 encrypt_packet(); | |
| 33 cli_ses.state = USERAUTH_METHODS_SENT; | |
| 34 TRACE(("leave cli_auth_getmethods")); | |
| 35 | |
| 36 } | |
| 37 | |
| 43 | 38 void recv_msg_userauth_banner() { |
| 39 | |
| 40 unsigned char* banner = NULL; | |
| 41 unsigned int bannerlen; | |
| 42 unsigned int i, linecount; | |
| 43 | |
| 44 TRACE(("enter recv_msg_userauth_banner")); | |
| 45 if (ses.authstate.authdone) { | |
| 46 TRACE(("leave recv_msg_userauth_banner: banner after auth done")); | |
| 47 return; | |
| 48 } | |
| 49 | |
| 50 banner = buf_getstring(ses.payload, &bannerlen); | |
| 51 buf_eatstring(ses.payload); /* The language string */ | |
| 52 | |
| 53 if (bannerlen > MAX_BANNER_SIZE) { | |
| 54 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen)); | |
| 55 goto out; | |
| 56 } | |
| 57 | |
| 58 cleantext(banner); | |
| 59 | |
| 60 /* Limit to 25 lines */ | |
| 61 linecount = 1; | |
| 62 for (i = 0; i < bannerlen; i++) { | |
| 63 if (banner[i] == '\n') { | |
| 64 if (linecount >= MAX_BANNER_LINES) { | |
| 65 banner[i] = '\0'; | |
| 66 break; | |
| 67 } | |
| 68 linecount++; | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 printf("%s\n", banner); | |
| 73 | |
| 74 out: | |
| 75 m_free(banner); | |
| 76 TRACE(("leave recv_msg_userauth_banner")); | |
| 77 } | |
| 78 | |
| 79 | |
| 33 | 80 void recv_msg_userauth_failure() { |
| 81 | |
| 82 unsigned char * methods = NULL; | |
| 83 unsigned char * tok = NULL; | |
| 84 unsigned int methlen = 0; | |
| 85 unsigned int partial = 0; | |
| 86 unsigned int i = 0; | |
| 87 | |
| 88 TRACE(("<- MSG_USERAUTH_FAILURE")); | |
| 89 TRACE(("enter recv_msg_userauth_failure")); | |
| 90 | |
| 91 methods = buf_getstring(ses.payload, &methlen); | |
| 92 | |
| 93 partial = buf_getbyte(ses.payload); | |
| 94 | |
| 95 if (partial) { | |
| 96 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required"); | |
| 97 } else { | |
| 98 ses.authstate.failcount++; | |
| 99 } | |
| 100 | |
| 101 TRACE(("Methods (len %d): '%s'", methlen, methods)); | |
| 102 | |
| 103 ses.authstate.authdone=0; | |
| 104 ses.authstate.authtypes=0; | |
| 105 | |
| 106 /* Split with nulls rather than commas */ | |
| 107 for (i = 0; i < methlen; i++) { | |
| 108 if (methods[i] == ',') { | |
| 109 methods[i] = '\0'; | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 tok = methods; /* tok stores the next method we'll compare */ | |
| 114 for (i = 0; i <= methlen; i++) { | |
| 115 if (methods[i] == '\0') { | |
|
34
e2a1eaa19f22
Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
116 TRACE(("auth method '%s'", tok)); |
| 33 | 117 #ifdef DROPBEAR_PUBKEY_AUTH |
| 118 if (strncmp(AUTH_METHOD_PUBKEY, tok, | |
| 119 AUTH_METHOD_PUBKEY_LEN) == 0) { | |
| 120 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY; | |
| 121 } | |
| 122 #endif | |
| 123 #ifdef DROPBEAR_PASSWORD_AUTH | |
| 124 if (strncmp(AUTH_METHOD_PASSWORD, tok, | |
| 125 AUTH_METHOD_PASSWORD_LEN) == 0) { | |
| 126 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD; | |
| 127 } | |
| 128 #endif | |
|
34
e2a1eaa19f22
Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
129 tok = &methods[i+1]; /* Must make sure we don't use it after the |
|
e2a1eaa19f22
Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
130 last loop, since it'll point to something |
|
e2a1eaa19f22
Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
131 undefined */ |
| 33 | 132 } |
| 133 } | |
| 134 | |
| 135 cli_ses.state = USERAUTH_FAIL_RCVD; | |
| 136 | |
| 137 TRACE(("leave recv_msg_userauth_failure")); | |
| 138 } | |
| 139 | |
| 140 void recv_msg_userauth_success() { | |
| 141 TRACE(("received msg_userauth_success")); | |
| 142 ses.authstate.authdone = 1; | |
| 37 | 143 cli_ses.state = USERAUTH_SUCCESS_RCVD; |
| 33 | 144 } |
| 145 | |
| 146 void cli_auth_try() { | |
| 147 | |
| 148 TRACE(("enter cli_auth_try")); | |
| 149 int finished = 0; | |
| 150 | |
| 151 CHECKCLEARTOWRITE(); | |
| 152 | |
| 153 /* XXX We hardcode that we try a pubkey first */ | |
| 154 #ifdef DROPBEAR_PUBKEY_AUTH | |
| 155 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) { | |
| 156 finished = cli_auth_pubkey(); | |
| 157 } | |
| 158 #endif | |
| 159 | |
| 160 #ifdef DROPBEAR_PASSWORD_AUTH | |
| 161 if (!finished && ses.authstate.authtypes & AUTH_TYPE_PASSWORD) { | |
| 162 finished = cli_auth_password(); | |
| 163 } | |
| 164 #endif | |
| 165 | |
| 166 if (!finished) { | |
| 167 dropbear_exit("No auth methods could be used."); | |
| 168 } | |
| 169 | |
| 170 cli_ses.state = USERAUTH_REQ_SENT; | |
| 171 TRACE(("leave cli_auth_try")); | |
| 172 } |