| 1 | |
| 2 | /* |
| 3 | ** Copyright 2000-2008 Double Precision, Inc. See COPYING for |
| 4 | ** distribution information. |
| 5 | */ |
| 6 | |
| 7 | #include "courier_auth_config.h" |
| 8 | #include "courierauthsasl.h" |
| 9 | #include "libhmac/hmac.h" |
| 10 | #include "authsaslclient.h" |
| 11 | #include <stdlib.h> |
| 12 | #include <stdio.h> |
| 13 | #include <ctype.h> |
| 14 | #include <string.h> |
| 15 | #include <errno.h> |
| 16 | |
| 17 | int authsaslclient_cram(const struct authsaslclientinfo *info, |
| 18 | const char *challenge, |
| 19 | const struct hmac_hashinfo *hashinfo) |
| 20 | { |
| 21 | char *base64buf=malloc(strlen(challenge)+1); |
| 22 | unsigned char *keybuf; |
| 23 | char *p; |
| 24 | const char *userid=info->userid ? info->userid:""; |
| 25 | const char *password=info->password ? info->password:""; |
| 26 | int i; |
| 27 | |
| 28 | if (!base64buf) |
| 29 | { |
| 30 | perror("malloc"); |
| 31 | return (AUTHSASL_ERROR); |
| 32 | } |
| 33 | strcpy(base64buf, challenge); |
| 34 | |
| 35 | if ( (i=authsasl_frombase64(base64buf))<0 || |
| 36 | (keybuf=(unsigned char *)malloc(hashinfo->hh_L*3)) == 0) |
| 37 | { |
| 38 | free(base64buf); |
| 39 | perror("malloc"); |
| 40 | return (AUTHSASL_ERROR); |
| 41 | } |
| 42 | |
| 43 | hmac_hashkey( hashinfo, password, strlen(password), |
| 44 | keybuf, keybuf+hashinfo->hh_L ); |
| 45 | |
| 46 | hmac_hashtext( hashinfo, base64buf, i, |
| 47 | keybuf, keybuf+hashinfo->hh_L, |
| 48 | keybuf+hashinfo->hh_L*2); |
| 49 | |
| 50 | free(base64buf); |
| 51 | base64buf=malloc(strlen(userid)+2+hashinfo->hh_L*2); |
| 52 | if (!base64buf) |
| 53 | { |
| 54 | perror("malloc"); |
| 55 | free(keybuf); |
| 56 | return (AUTHSASL_ERROR); |
| 57 | } |
| 58 | strcat(strcpy(base64buf, userid), " "); |
| 59 | p=base64buf+strlen(base64buf); |
| 60 | for (i=0; i<hashinfo->hh_L; i++) |
| 61 | { |
| 62 | static const char xdigit[]="0123456789abcdef"; |
| 63 | int c=keybuf[hashinfo->hh_L*2+i]; |
| 64 | |
| 65 | *p++ = xdigit[ (c >> 4) & 0x0F ]; |
| 66 | *p++ = xdigit[c & 0x0F]; |
| 67 | } |
| 68 | *p=0; |
| 69 | free(keybuf); |
| 70 | keybuf=(unsigned char *)authsasl_tobase64(base64buf, -1); |
| 71 | free(base64buf); |
| 72 | |
| 73 | if (!keybuf) |
| 74 | { |
| 75 | perror("malloc"); |
| 76 | free(keybuf); |
| 77 | return (AUTHSASL_ERROR); |
| 78 | } |
| 79 | i= (*info->final_conv_func)((char *)keybuf, info->conv_func_arg); |
| 80 | free(keybuf); |
| 81 | return (i); |
| 82 | } |