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Commit8607630

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Rename some variables related to ident files in hba.{c,h}
The code that handles authentication for user maps was pretty confusingwith its choice of variable names. It involves two types of users: asystem user and a Postgres user (well, role), and these were not namedconsistently throughout the code that processes the user maps loadedfrom pg_ident.conf at authentication.This commit changes the following things to improve the situation:- Rename "pg_role" to "pg_user" and "token" to "system_user" inIndetLine. These choices are more consistent with the pg_ident.confexample in the docs, as well. "token" has been introduced recently infc579e1, and it is way worse than the choice before that, "ident_user".- Switch the order of the fields in IdentLine to map with the order ofthe items in the ident files, as of map name, system user and PG user.- In check_ident_usermap(), rename "regexp_pgrole" to "expanded_pg_user"when processing a regexp for the system user entry in a user map. Thisvariable does not store a regular expression at all: it would be eithera string or a substitution to \1 if the Postgres role is specified assuch.Author: Jelte FennemaDiscussion:https://postgr.es/m/CAGECzQTkwELHUOAKhvdA+m3tWbUQySHHkExJV8GAZ1pwgbEgXg@mail.gmail.com
1 parentbfd2542 commit8607630

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3 files changed

+44
-44
lines changed

3 files changed

+44
-44
lines changed

‎src/backend/libpq/hba.c‎

Lines changed: 39 additions & 39 deletions
Original file line numberDiff line numberDiff line change
@@ -2792,21 +2792,21 @@ parse_ident_line(TokenizedAuthLine *tok_line, int elevel)
27922792
token=linitial(tokens);
27932793

27942794
/* Copy the ident user token */
2795-
parsedline->token=copy_auth_token(token);
2795+
parsedline->system_user=copy_auth_token(token);
27962796

27972797
/* Get the PG rolename token */
27982798
field=lnext(tok_line->fields,field);
27992799
IDENT_FIELD_ABSENT(field);
28002800
tokens=lfirst(field);
28012801
IDENT_MULTI_VALUE(tokens);
28022802
token=linitial(tokens);
2803-
parsedline->pg_role=pstrdup(token->string);
2803+
parsedline->pg_user=pstrdup(token->string);
28042804

28052805
/*
28062806
* Now that the field validation is done, compile a regex from the user
28072807
* token, if necessary.
28082808
*/
2809-
if (regcomp_auth_token(parsedline->token,file_name,line_num,
2809+
if (regcomp_auth_token(parsedline->system_user,file_name,line_num,
28102810
err_msg,elevel))
28112811
{
28122812
/* err_msg includes the error to report */
@@ -2819,12 +2819,12 @@ parse_ident_line(TokenizedAuthLine *tok_line, int elevel)
28192819
/*
28202820
*Process one line from the parsed ident config lines.
28212821
*
2822-
*Compare input parsed ident line to the needed map,pg_role andident_user.
2822+
*Compare input parsed ident line to the needed map,pg_user andsystem_user.
28232823
**found_p and *error_p are set according to our results.
28242824
*/
28252825
staticvoid
28262826
check_ident_usermap(IdentLine*identLine,constchar*usermap_name,
2827-
constchar*pg_role,constchar*ident_user,
2827+
constchar*pg_user,constchar*system_user,
28282828
boolcase_insensitive,bool*found_p,bool*error_p)
28292829
{
28302830
*found_p= false;
@@ -2835,7 +2835,7 @@ check_ident_usermap(IdentLine *identLine, const char *usermap_name,
28352835
return;
28362836

28372837
/* Match? */
2838-
if (token_has_regexp(identLine->token))
2838+
if (token_has_regexp(identLine->system_user))
28392839
{
28402840
/*
28412841
* Process the system username as a regular expression that returns
@@ -2845,27 +2845,27 @@ check_ident_usermap(IdentLine *identLine, const char *usermap_name,
28452845
intr;
28462846
regmatch_tmatches[2];
28472847
char*ofs;
2848-
char*regexp_pgrole;
2848+
char*expanded_pg_user;
28492849

2850-
r=regexec_auth_token(ident_user,identLine->token,2,matches);
2850+
r=regexec_auth_token(system_user,identLine->system_user,2,matches);
28512851
if (r)
28522852
{
28532853
charerrstr[100];
28542854

28552855
if (r!=REG_NOMATCH)
28562856
{
28572857
/* REG_NOMATCH is not an error, everything else is */
2858-
pg_regerror(r,identLine->token->regex,errstr,sizeof(errstr));
2858+
pg_regerror(r,identLine->system_user->regex,errstr,sizeof(errstr));
28592859
ereport(LOG,
28602860
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
28612861
errmsg("regular expression match for \"%s\" failed: %s",
2862-
identLine->token->string+1,errstr)));
2862+
identLine->system_user->string+1,errstr)));
28632863
*error_p= true;
28642864
}
28652865
return;
28662866
}
28672867

2868-
if ((ofs=strstr(identLine->pg_role,"\\1"))!=NULL)
2868+
if ((ofs=strstr(identLine->pg_user,"\\1"))!=NULL)
28692869
{
28702870
intoffset;
28712871

@@ -2875,7 +2875,7 @@ check_ident_usermap(IdentLine *identLine, const char *usermap_name,
28752875
ereport(LOG,
28762876
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
28772877
errmsg("regular expression \"%s\" has no subexpressions as requested by backreference in \"%s\"",
2878-
identLine->token->string+1,identLine->pg_role)));
2878+
identLine->system_user->string+1,identLine->pg_user)));
28792879
*error_p= true;
28802880
return;
28812881
}
@@ -2884,18 +2884,18 @@ check_ident_usermap(IdentLine *identLine, const char *usermap_name,
28842884
* length: original length minus length of \1 plus length of match
28852885
* plus null terminator
28862886
*/
2887-
regexp_pgrole=palloc0(strlen(identLine->pg_role)-2+ (matches[1].rm_eo-matches[1].rm_so)+1);
2888-
offset=ofs-identLine->pg_role;
2889-
memcpy(regexp_pgrole,identLine->pg_role,offset);
2890-
memcpy(regexp_pgrole+offset,
2891-
ident_user+matches[1].rm_so,
2887+
expanded_pg_user=palloc0(strlen(identLine->pg_user)-2+ (matches[1].rm_eo-matches[1].rm_so)+1);
2888+
offset=ofs-identLine->pg_user;
2889+
memcpy(expanded_pg_user,identLine->pg_user,offset);
2890+
memcpy(expanded_pg_user+offset,
2891+
system_user+matches[1].rm_so,
28922892
matches[1].rm_eo-matches[1].rm_so);
2893-
strcat(regexp_pgrole,ofs+2);
2893+
strcat(expanded_pg_user,ofs+2);
28942894
}
28952895
else
28962896
{
28972897
/* no substitution, so copy the match */
2898-
regexp_pgrole=pstrdup(identLine->pg_role);
2898+
expanded_pg_user=pstrdup(identLine->pg_user);
28992899
}
29002900

29012901
/*
@@ -2904,15 +2904,15 @@ check_ident_usermap(IdentLine *identLine, const char *usermap_name,
29042904
*/
29052905
if (case_insensitive)
29062906
{
2907-
if (pg_strcasecmp(regexp_pgrole,pg_role)==0)
2907+
if (pg_strcasecmp(expanded_pg_user,pg_user)==0)
29082908
*found_p= true;
29092909
}
29102910
else
29112911
{
2912-
if (strcmp(regexp_pgrole,pg_role)==0)
2912+
if (strcmp(expanded_pg_user,pg_user)==0)
29132913
*found_p= true;
29142914
}
2915-
pfree(regexp_pgrole);
2915+
pfree(expanded_pg_user);
29162916

29172917
return;
29182918
}
@@ -2921,14 +2921,14 @@ check_ident_usermap(IdentLine *identLine, const char *usermap_name,
29212921
/* Not regular expression, so make complete match */
29222922
if (case_insensitive)
29232923
{
2924-
if (pg_strcasecmp(identLine->pg_role,pg_role)==0&&
2925-
pg_strcasecmp(identLine->token->string,ident_user)==0)
2924+
if (pg_strcasecmp(identLine->pg_user,pg_user)==0&&
2925+
pg_strcasecmp(identLine->system_user->string,system_user)==0)
29262926
*found_p= true;
29272927
}
29282928
else
29292929
{
2930-
if (strcmp(identLine->pg_role,pg_role)==0&&
2931-
strcmp(identLine->token->string,ident_user)==0)
2930+
if (strcmp(identLine->pg_user,pg_user)==0&&
2931+
strcmp(identLine->system_user->string,system_user)==0)
29322932
*found_p= true;
29332933
}
29342934
}
@@ -2938,20 +2938,20 @@ check_ident_usermap(IdentLine *identLine, const char *usermap_name,
29382938
/*
29392939
*Scan the (pre-parsed) ident usermap file line by line, looking for a match
29402940
*
2941-
*See if the user with ident username "auth_user" is allowed to act
2942-
*asPostgres user "pg_role" according to usermap "usermap_name".
2941+
*See if thesystemuser with ident username "system_user" is allowed to act as
2942+
*Postgres user "pg_user" according to usermap "usermap_name".
29432943
*
29442944
*Special case: Usermap NULL, equivalent to what was previously called
29452945
*"sameuser" or "samerole", means don't look in the usermap file.
2946-
*That's an implied map wherein "pg_role" must be identical to
2947-
*"auth_user" in order to be authorized.
2946+
*That's an implied map wherein "pg_user" must be identical to
2947+
*"system_user" in order to be authorized.
29482948
*
29492949
*Iff authorized, return STATUS_OK, otherwise return STATUS_ERROR.
29502950
*/
29512951
int
29522952
check_usermap(constchar*usermap_name,
2953-
constchar*pg_role,
2954-
constchar*auth_user,
2953+
constchar*pg_user,
2954+
constchar*system_user,
29552955
boolcase_insensitive)
29562956
{
29572957
boolfound_entry= false,
@@ -2961,17 +2961,17 @@ check_usermap(const char *usermap_name,
29612961
{
29622962
if (case_insensitive)
29632963
{
2964-
if (pg_strcasecmp(pg_role,auth_user)==0)
2964+
if (pg_strcasecmp(pg_user,system_user)==0)
29652965
returnSTATUS_OK;
29662966
}
29672967
else
29682968
{
2969-
if (strcmp(pg_role,auth_user)==0)
2969+
if (strcmp(pg_user,system_user)==0)
29702970
returnSTATUS_OK;
29712971
}
29722972
ereport(LOG,
29732973
(errmsg("provided user name (%s) and authenticated user name (%s) do not match",
2974-
pg_role,auth_user)));
2974+
pg_user,system_user)));
29752975
returnSTATUS_ERROR;
29762976
}
29772977
else
@@ -2981,7 +2981,7 @@ check_usermap(const char *usermap_name,
29812981
foreach(line_cell,parsed_ident_lines)
29822982
{
29832983
check_ident_usermap(lfirst(line_cell),usermap_name,
2984-
pg_role,auth_user,case_insensitive,
2984+
pg_user,system_user,case_insensitive,
29852985
&found_entry,&error);
29862986
if (found_entry||error)
29872987
break;
@@ -2991,7 +2991,7 @@ check_usermap(const char *usermap_name,
29912991
{
29922992
ereport(LOG,
29932993
(errmsg("no match in usermap \"%s\" for user \"%s\" authenticated as \"%s\"",
2994-
usermap_name,pg_role,auth_user)));
2994+
usermap_name,pg_user,system_user)));
29952995
}
29962996
returnfound_entry ?STATUS_OK :STATUS_ERROR;
29972997
}
@@ -3073,7 +3073,7 @@ load_ident(void)
30733073
foreach(parsed_line_cell,new_parsed_lines)
30743074
{
30753075
newline= (IdentLine*)lfirst(parsed_line_cell);
3076-
free_auth_token(newline->token);
3076+
free_auth_token(newline->system_user);
30773077
}
30783078
MemoryContextDelete(ident_context);
30793079
return false;
@@ -3085,7 +3085,7 @@ load_ident(void)
30853085
foreach(parsed_line_cell,parsed_ident_lines)
30863086
{
30873087
newline= (IdentLine*)lfirst(parsed_line_cell);
3088-
free_auth_token(newline->token);
3088+
free_auth_token(newline->system_user);
30893089
}
30903090
}
30913091
if (parsed_ident_context!=NULL)

‎src/backend/utils/adt/hbafuncs.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -492,8 +492,8 @@ fill_ident_line(Tuplestorestate *tuple_store, TupleDesc tupdesc,
492492
if (ident!=NULL)
493493
{
494494
values[index++]=CStringGetTextDatum(ident->usermap);
495-
values[index++]=CStringGetTextDatum(ident->token->string);
496-
values[index++]=CStringGetTextDatum(ident->pg_role);
495+
values[index++]=CStringGetTextDatum(ident->system_user->string);
496+
values[index++]=CStringGetTextDatum(ident->pg_user);
497497
}
498498
else
499499
{

‎src/include/libpq/hba.h‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -142,8 +142,8 @@ typedef struct IdentLine
142142
intlinenumber;
143143

144144
char*usermap;
145-
char*pg_role;
146-
AuthToken*token;
145+
AuthToken*system_user;
146+
char*pg_user;
147147
}IdentLine;
148148

149149
/*
@@ -172,7 +172,7 @@ extern bool load_ident(void);
172172
externconstchar*hba_authname(UserAuthauth_method);
173173
externvoidhba_getauthmethod(hbaPort*port);
174174
externintcheck_usermap(constchar*usermap_name,
175-
constchar*pg_role,constchar*auth_user,
175+
constchar*pg_user,constchar*system_user,
176176
boolcase_insensitive);
177177
externHbaLine*parse_hba_line(TokenizedAuthLine*tok_line,intelevel);
178178
externIdentLine*parse_ident_line(TokenizedAuthLine*tok_line,intelevel);

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